./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3855524604 <...> [ 91.767848][ T10] cfg80211: failed to load regulatory.db Warning: Permanently added '10.128.1.24' (ED25519) to the list of known hosts. execve("./syz-executor3855524604", ["./syz-executor3855524604"], 0x7ffc2e2165d0 /* 10 vars */) = 0 brk(NULL) = 0x555559447000 brk(0x555559447e00) = 0x555559447e00 arch_prctl(ARCH_SET_FS, 0x555559447480) = 0 set_tid_address(0x555559447750) = 5840 set_robust_list(0x555559447760, 24) = 0 rseq(0x555559447da0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor3855524604", 4096) = 28 getrandom("\xcb\xb3\xe2\xda\xa1\x0d\xc5\x9a", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555559447e00 brk(0x555559468e00) = 0x555559468e00 brk(0x555559469000) = 0x555559469000 mprotect(0x7f797c673000, 16384, PROT_READ) = 0 mmap(0x1ffffffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffffffff000 mmap(0x200000000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200000000000 mmap(0x200001000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x200001000000 rt_sigaction(SIGRTMIN, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=0}, NULL, 8) = 0 rt_sigaction(SIGRT_1, {sa_handler=SIG_IGN, sa_mask=[], sa_flags=0}, NULL, 8) = 0 rt_sigaction(SIGSEGV, {sa_handler=0x7f797c5c4a60, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7f797c5cd8a0}, NULL, 8) = 0 rt_sigaction(SIGBUS, {sa_handler=0x7f797c5c4a60, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7f797c5cd8a0}, NULL, 8) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = -1 ENXIO (No such device or address) close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5841 attached [pid 5841] set_robust_list(0x555559447760, 24 [pid 5840] <... clone resumed>, child_tidptr=0x555559447750) = 5841 [pid 5841] <... set_robust_list resumed>) = 0 [pid 5841] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5841] setpgid(0, 0) = 0 [pid 5841] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5841] write(3, "1000", 4) = 4 [pid 5841] close(3) = 0 [pid 5841] write(1, "executing program\n", 18executing program ) = 18 [pid 5841] memfd_create("syzkaller", 0) = 3 [pid 5841] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5841] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5841] munmap(0x7f7974000000, 138412032) = 0 [pid 5841] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5841] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5841] close(3) = 0 [pid 5841] close(4) = 0 [pid 5841] mkdir("./file0", 0777) = 0 [ 94.315040][ T5841] loop0: detected capacity change from 0 to 32768 [ 94.414631][ T5841] bcachefs (loop0): starting version 1.7: mi_btree_bitmap opts=errors=continue,metadata_checksum=none,data_checksum=none,str_hash=crc32c,noacl,usrquota,grpquota,nojournal_transaction_names,allocator_stuck_timeout=256 [ 94.414653][ T5841] allowing incompatible features above 0.0: (unknown version) [ 94.414662][ T5841] features: lz4,new_siphash,inline_data,new_extent_overwrite,btree_ptr_v2,new_varint,journal_no_flush,alloc_v2,extents_across_btree_nodes [ 94.458479][ T5841] bcachefs (loop0): Using encoding defined by superblock: utf8-12.1.0 [ 94.466754][ T5841] bcachefs (loop0): initializing new filesystem [ 94.481923][ T5841] bcachefs (loop0): going read-write [ 94.492293][ T5841] bcachefs (loop0): marking superblocks [pid 5841] mount("/dev/loop0", "./file0", "bcachefs", MS_SYNCHRONOUS|MS_DIRSYNC|MS_NOATIME, "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x30\x78\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30") = 0 [pid 5841] openat(AT_FDCWD, "./file0", O_RDONLY|O_DIRECTORY) = 3 [pid 5841] chdir("./file0") = 0 [ 94.510603][ T5841] bcachefs (loop0): initializing freespace [ 94.519579][ T5841] bcachefs (loop0): done initializing freespace [ 94.530215][ T5841] bcachefs (loop0): reading snapshots table [ 94.536333][ T5841] bcachefs (loop0): reading snapshots done [ 94.556316][ T5841] bcachefs (loop0): done starting filesystem [pid 5841] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5841] ioctl(4, LOOP_CLR_FD) = 0 [pid 5841] close(4) = 0 [pid 5841] mkdir("./bus", 0777) = 0 [pid 5841] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5841] mkdir("./file1", 000) = 0 [pid 5841] mkdir("./file0", 000) = 0 [pid 5841] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = 0 [pid 5841] openat(AT_FDCWD, "./file0", O_RDONLY) = 4 [pid 5841] symlinkat("./file1/file0", 4, "./file1") = 0 [pid 5841] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5841] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5841] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 5 [pid 5841] chdir("./bus") = 0 [ 94.744366][ T5841] [ 94.746722][ T5841] ============================================ [ 94.752866][ T5841] WARNING: possible recursive locking detected [ 94.759028][ T5841] 6.16.0-rc3-next-20250625-syzkaller #0 Not tainted [ 94.765604][ T5841] -------------------------------------------- [ 94.771763][ T5841] syz-executor385/5841 is trying to acquire lock: [ 94.778168][ T5841] ffff88804822cd38 (&sb->s_type->i_mutex_key#17){++++}-{4:4}, at: bch2_symlink+0xf2/0x240 [ 94.788105][ T5841] [ 94.788105][ T5841] but task is already holding lock: [ 94.795459][ T5841] ffff88804822be08 (&sb->s_type->i_mutex_key#17){++++}-{4:4}, at: ovl_copy_up_flags+0x10bf/0x2ff0 [ 94.806073][ T5841] [ 94.806073][ T5841] other info that might help us debug this: [ 94.814138][ T5841] Possible unsafe locking scenario: [ 94.814138][ T5841] [ 94.821577][ T5841] CPU0 [ 94.824849][ T5841] ---- [ 94.828116][ T5841] lock(&sb->s_type->i_mutex_key#17); [ 94.833576][ T5841] lock(&sb->s_type->i_mutex_key#17); [ 94.839047][ T5841] [ 94.839047][ T5841] *** DEADLOCK *** [ 94.839047][ T5841] [ 94.847205][ T5841] May be due to missing lock nesting notation [ 94.847205][ T5841] [ 94.855520][ T5841] 6 locks held by syz-executor385/5841: [ 94.861051][ T5841] #0: ffff888034218428 (sb_writers#9){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 [ 94.870198][ T5841] #1: ffff888048231e50 (&ovl_i_mutex_dir_key[depth]/1){+.+.}-{4:4}, at: do_unlinkat+0x1c7/0x560 [ 94.880733][ T5841] #2: ffff888048232418 (&ovl_i_mutex_key[depth]){+.+.}-{4:4}, at: vfs_unlink+0xf2/0x650 [ 94.890571][ T5841] #3: ffff8880482327d0 (&ovl_i_lock_key[depth]){+.+.}-{4:4}, at: ovl_copy_up_start+0x56/0x330 [ 94.900930][ T5841] #4: ffff88807cdca428 (sb_writers#8){.+.+}-{0:0}, at: ovl_copy_up_flags+0x10b0/0x2ff0 [ 94.910708][ T5841] #5: ffff88804822be08 (&sb->s_type->i_mutex_key#17){++++}-{4:4}, at: ovl_copy_up_flags+0x10bf/0x2ff0 [ 94.921766][ T5841] [ 94.921766][ T5841] stack backtrace: [ 94.927670][ T5841] CPU: 0 UID: 0 PID: 5841 Comm: syz-executor385 Not tainted 6.16.0-rc3-next-20250625-syzkaller #0 PREEMPT(full) [ 94.927691][ T5841] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 94.927708][ T5841] Call Trace: [ 94.927717][ T5841] [ 94.927724][ T5841] dump_stack_lvl+0x189/0x250 [ 94.927753][ T5841] ? __pfx_dump_stack_lvl+0x10/0x10 [ 94.927777][ T5841] ? __pfx__printk+0x10/0x10 [ 94.927795][ T5841] ? print_lock_name+0xde/0x100 [ 94.927812][ T5841] print_deadlock_bug+0x28b/0x2a0 [ 94.927838][ T5841] validate_chain+0x1a3f/0x2140 [ 94.927865][ T5841] ? look_up_lock_class+0x74/0x170 [ 94.927893][ T5841] ? register_lock_class+0x51/0x320 [ 94.927914][ T5841] __lock_acquire+0xab9/0xd20 [ 94.927937][ T5841] ? bch2_symlink+0xf2/0x240 [ 94.927951][ T5841] lock_acquire+0x120/0x360 [ 94.927974][ T5841] ? bch2_symlink+0xf2/0x240 [ 94.927994][ T5841] down_write+0x96/0x1f0 [ 94.928008][ T5841] ? bch2_symlink+0xf2/0x240 [ 94.928022][ T5841] ? __pfx_down_write+0x10/0x10 [ 94.928036][ T5841] ? generic_permission+0x359/0x690 [ 94.928054][ T5841] bch2_symlink+0xf2/0x240 [ 94.928070][ T5841] vfs_symlink+0x140/0x2f0 [ 94.928094][ T5841] ovl_do_symlink+0x89/0xd0 [ 94.928136][ T5841] ovl_create_real+0x228/0x3f0 [ 94.928160][ T5841] ovl_copy_up_flags+0x10d9/0x2ff0 [ 94.928188][ T5841] ? __pfx_ovl_copy_up_flags+0x10/0x10 [ 94.928206][ T5841] ? __pfx_ovl_copy_up_flags+0x10/0x10 [ 94.928225][ T5841] ? unwind_next_frame+0xa5/0x2390 [ 94.928260][ T5841] ? rcu_is_watching+0x15/0xb0 [ 94.928282][ T5841] ? __kasan_check_byte+0x12/0x40 [ 94.928307][ T5841] ? unwind_next_frame+0xa5/0x2390 [ 94.928331][ T5841] ? is_bpf_text_address+0x26/0x2b0 [ 94.928352][ T5841] ? rcu_is_watching+0x15/0xb0 [ 94.928372][ T5841] ? __kasan_check_byte+0x12/0x40 [ 94.928396][ T5841] ? rcu_is_watching+0x15/0xb0 [ 94.928418][ T5841] ? lock_release+0x4b/0x3e0 [ 94.928436][ T5841] ? lock_release+0x4b/0x3e0 [ 94.928457][ T5841] ? is_bpf_text_address+0x292/0x2b0 [ 94.928478][ T5841] ? is_bpf_text_address+0x26/0x2b0 [ 94.928499][ T5841] ? kernel_text_address+0xa5/0xe0 [ 94.928518][ T5841] ? __kernel_text_address+0xd/0x40 [ 94.928535][ T5841] ? __pfx_page_put_link+0x10/0x10 [ 94.928559][ T5841] ? __pfx_stack_trace_consume_entry+0x10/0x10 [ 94.928595][ T5841] ? __pfx_ovl_lower_positive+0x10/0x10 [ 94.928616][ T5841] ? ovl_need_index+0x211/0x3c0 [ 94.928633][ T5841] ovl_nlink_start+0x9a/0x3e0 [ 94.928648][ T5841] ? ovl_do_remove+0x229/0xeb0 [ 94.928673][ T5841] ovl_do_remove+0x267/0xeb0 [ 94.928697][ T5841] ? vfs_unlink+0xf2/0x650 [ 94.928718][ T5841] ? HAS_UNMAPPED_ID+0x11a/0x180 [ 94.928734][ T5841] ? __pfx_ovl_do_remove+0x10/0x10 [ 94.928759][ T5841] ? down_write+0x162/0x1f0 [ 94.928773][ T5841] ? __pfx_down_write+0x10/0x10 [ 94.928788][ T5841] ? bpf_lsm_inode_unlink+0x9/0x20 [ 94.928806][ T5841] vfs_unlink+0x394/0x650 [ 94.928830][ T5841] do_unlinkat+0x345/0x560 [ 94.928853][ T5841] ? __pfx_do_unlinkat+0x10/0x10 [ 94.928877][ T5841] ? getname_flags+0x1e5/0x540 [ 94.928893][ T5841] __x64_sys_unlink+0x47/0x50 [ 94.928914][ T5841] do_syscall_64+0xfa/0x3b0 [ 94.928938][ T5841] ? lockdep_hardirqs_on+0x9c/0x150 [ 94.928965][ T5841] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 94.928981][ T5841] ? clear_bhb_loop+0x60/0xb0 [ 94.928999][ T5841] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 94.929014][ T5841] RIP: 0033:0x7f797c5fab99 [ 94.929033][ T5841] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 94.929051][ T5841] RSP: 002b:00007ffcbf2320b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 [ 94.929067][ T5841] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f797c5fab99 [pid 5841] unlink("./file1") = 0 [pid 5841] exit_group(0) = ? [pid 5841] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5841, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=40 /* 0.40 s */} --- [ 94.929079][ T5841] RDX: 0000000000000000 RSI: ff8da56b5a8836f2 RDI: 0000200000000440 [ 94.929090][ T5841] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffcbf2320f0 [ 94.929100][ T5841] R10: 00007ffcbf231f70 R11: 0000000000000246 R12: 00007ffcbf2320f0 [ 94.929110][ T5841] R13: 00007ffcbf232378 R14: 431bde82d7b634db R15: 00007f797c64303b [ 94.929128][ T5841] restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5852 attached , child_tidptr=0x555559447750) = 5852 [pid 5852] set_robust_list(0x555559447760, 24) = 0 [pid 5852] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5852] setpgid(0, 0) = 0 [pid 5852] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5852] write(3, "1000", 4) = 4 [pid 5852] close(3) = 0 [pid 5852] write(1, "executing program\n", 18executing program ) = 18 [pid 5852] memfd_create("syzkaller", 0) = 3 [pid 5852] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [ 95.356271][ T5841] syz-executor385 (5841) used greatest stack depth: 17400 bytes left [pid 5852] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5852] munmap(0x7f7974000000, 138412032) = 0 [pid 5852] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5852] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5852] ioctl(4, LOOP_CLR_FD) = 0 [pid 5852] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5852] close(4) = 0 [pid 5852] close(3) = 0 [pid 5852] mkdir("./bus", 0777) = 0 [pid 5852] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5852] mkdir("./file1", 000) = 0 [pid 5852] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5852] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = 0 [pid 5852] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5852] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5852] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5852] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5852] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5852] chdir("./bus") = 0 [pid 5852] unlink("./file1") = -1 EISDIR (Is a directory) [pid 5852] exit_group(0) = ? [pid 5852] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5852, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=17 /* 0.17 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5854 attached , child_tidptr=0x555559447750) = 5854 [pid 5854] set_robust_list(0x555559447760, 24) = 0 [pid 5854] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5854] setpgid(0, 0) = 0 [pid 5854] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5854] write(3, "1000", 4executing program ) = 4 [pid 5854] close(3) = 0 [pid 5854] write(1, "executing program\n", 18) = 18 [pid 5854] memfd_create("syzkaller", 0) = 3 [pid 5854] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5854] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5854] munmap(0x7f7974000000, 138412032) = 0 [pid 5854] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5854] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5854] ioctl(4, LOOP_CLR_FD) = 0 [pid 5854] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5854] close(4) = 0 [pid 5854] close(3) = 0 [pid 5854] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5854] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5854] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5854] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5854] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5854] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5854] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5854] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5854] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5854] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5854] chdir("./bus") = 0 [ 96.072898][ T5854] overlay: filesystem on ./bus not supported as upperdir [pid 5854] unlink("./file1") = -1 EISDIR (Is a directory) [pid 5854] exit_group(0) = ? [pid 5854] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5854, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=15 /* 0.15 s */} --- openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5855 attached , child_tidptr=0x555559447750) = 5855 [pid 5855] set_robust_list(0x555559447760, 24) = 0 [pid 5855] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5855] setpgid(0, 0) = 0 [pid 5855] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5855] write(3, "1000", 4) = 4 [pid 5855] close(3) = 0 executing program [pid 5855] write(1, "executing program\n", 18) = 18 [pid 5855] memfd_create("syzkaller", 0) = 3 [pid 5855] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5855] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5855] munmap(0x7f7974000000, 138412032) = 0 [pid 5855] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5855] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5855] ioctl(4, LOOP_CLR_FD) = 0 [pid 5855] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5855] close(4) = 0 [pid 5855] close(3) = 0 [pid 5855] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5855] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5855] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5855] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5855] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5855] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5855] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5855] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5855] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5855] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5855] chdir("./bus") = 0 [pid 5855] unlink("./file1") = -1 EISDIR (Is a directory) [pid 5855] exit_group(0) = ? [ 96.519157][ T5855] overlay: filesystem on ./bus not supported as upperdir [pid 5855] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5855, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=13 /* 0.13 s */} --- openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5856 attached [pid 5856] set_robust_list(0x555559447760, 24) = 0 [pid 5856] prctl(PR_SET_PDEATHSIG, SIGKILL [pid 5840] <... clone resumed>, child_tidptr=0x555559447750) = 5856 [pid 5856] <... prctl resumed>) = 0 [pid 5856] setpgid(0, 0) = 0 [pid 5856] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5856] write(3, "1000", 4) = 4 [pid 5856] close(3) = 0 [pid 5856] write(1, "executing program\n", 18executing program ) = 18 [pid 5856] memfd_create("syzkaller", 0) = 3 [pid 5856] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5856] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5856] munmap(0x7f7974000000, 138412032) = 0 [pid 5856] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5856] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5856] ioctl(4, LOOP_CLR_FD) = 0 [pid 5856] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5856] close(4) = 0 [pid 5856] close(3) = 0 [pid 5856] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5856] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5856] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5856] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5856] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5856] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5856] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5856] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5856] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [ 97.014688][ T5856] overlay: filesystem on ./bus not supported as upperdir [pid 5856] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5856] chdir("./bus") = 0 [pid 5856] unlink("./file1") = -1 EISDIR (Is a directory) [pid 5856] exit_group(0) = ? [pid 5856] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5856, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=16 /* 0.16 s */} --- openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5857 attached , child_tidptr=0x555559447750) = 5857 [pid 5857] set_robust_list(0x555559447760, 24) = 0 [pid 5857] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5857] setpgid(0, 0) = 0 [pid 5857] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5857] write(3, "1000", 4) = 4 [pid 5857] close(3) = 0 [pid 5857] write(1, "executing program\n", 18executing program ) = 18 [pid 5857] memfd_create("syzkaller", 0) = 3 [pid 5857] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5857] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5857] munmap(0x7f7974000000, 138412032) = 0 [pid 5857] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5857] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5857] ioctl(4, LOOP_CLR_FD) = 0 [pid 5857] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5857] close(4) = 0 [pid 5857] close(3) = 0 [pid 5857] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5857] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5857] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5857] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5857] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5857] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5857] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5857] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5857] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5857] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5857] chdir("./bus") = 0 [pid 5857] unlink("./file1") = -1 EISDIR (Is a directory) [pid 5857] exit_group(0) = ? [pid 5857] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5857, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=18 /* 0.18 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5858 attached , child_tidptr=0x555559447750) = 5858 [pid 5858] set_robust_list(0x555559447760, 24) = 0 [pid 5858] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5858] setpgid(0, 0) = 0 [pid 5858] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5858] write(3, "1000", 4) = 4 [pid 5858] close(3) = 0 executing program [pid 5858] write(1, "executing program\n", 18) = 18 [ 97.471783][ T5857] overlay: filesystem on ./bus not supported as upperdir [pid 5858] memfd_create("syzkaller", 0) = 3 [pid 5858] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5858] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5858] munmap(0x7f7974000000, 138412032) = 0 [pid 5858] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5858] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5858] ioctl(4, LOOP_CLR_FD) = 0 [pid 5858] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5858] close(4) = 0 [pid 5858] close(3) = 0 [pid 5858] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5858] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5858] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5858] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5858] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5858] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5858] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5858] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5858] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5858] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5858] chdir("./bus") = 0 [pid 5858] unlink("./file1") = -1 EISDIR (Is a directory) [ 97.809792][ T5858] overlay: filesystem on ./bus not supported as upperdir [pid 5858] exit_group(0) = ? [pid 5858] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5858, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=14 /* 0.14 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5859 attached , child_tidptr=0x555559447750) = 5859 [pid 5859] set_robust_list(0x555559447760, 24) = 0 [pid 5859] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5859] setpgid(0, 0) = 0 [pid 5859] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5859] write(3, "1000", 4) = 4 [pid 5859] close(3) = 0 executing program [pid 5859] write(1, "executing program\n", 18) = 18 [pid 5859] memfd_create("syzkaller", 0) = 3 [pid 5859] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5859] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5859] munmap(0x7f7974000000, 138412032) = 0 [pid 5859] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5859] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5859] ioctl(4, LOOP_CLR_FD) = 0 [pid 5859] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5859] close(4) = 0 [pid 5859] close(3) = 0 [pid 5859] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5859] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5859] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5859] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5859] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5859] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5859] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5859] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5859] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5859] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5859] chdir("./bus") = 0 [ 98.313270][ T5859] overlay: filesystem on ./bus not supported as upperdir [pid 5859] unlink("./file1") = -1 EISDIR (Is a directory) [pid 5859] exit_group(0) = ? [pid 5859] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5859, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=14 /* 0.14 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5860 attached [pid 5860] set_robust_list(0x555559447760, 24) = 0 [pid 5840] <... clone resumed>, child_tidptr=0x555559447750) = 5860 [pid 5860] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5860] setpgid(0, 0) = 0 [pid 5860] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5860] write(3, "1000", 4) = 4 [pid 5860] close(3) = 0 [pid 5860] write(1, "executing program\n", 18executing program ) = 18 [pid 5860] memfd_create("syzkaller", 0) = 3 [pid 5860] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5860] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5860] munmap(0x7f7974000000, 138412032) = 0 [pid 5860] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5860] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5860] ioctl(4, LOOP_CLR_FD) = 0 [pid 5860] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5860] close(4) = 0 [pid 5860] close(3) = 0 [pid 5860] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5860] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5860] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5860] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5860] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5860] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5860] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5860] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5860] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [ 98.750099][ T5860] overlay: filesystem on ./bus not supported as upperdir [pid 5860] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5860] chdir("./bus") = 0 [pid 5860] unlink("./file1") = -1 EISDIR (Is a directory) [pid 5860] exit_group(0) = ? [pid 5860] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5860, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=15 /* 0.15 s */} --- openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5861 attached [pid 5861] set_robust_list(0x555559447760, 24 [pid 5840] <... clone resumed>, child_tidptr=0x555559447750) = 5861 [pid 5861] <... set_robust_list resumed>) = 0 [pid 5861] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5861] setpgid(0, 0) = 0 [pid 5861] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5861] write(3, "1000", 4) = 4 [pid 5861] close(3) = 0 executing program [pid 5861] write(1, "executing program\n", 18) = 18 [pid 5861] memfd_create("syzkaller", 0) = 3 [pid 5861] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5861] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5861] munmap(0x7f7974000000, 138412032) = 0 [pid 5861] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5861] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5861] ioctl(4, LOOP_CLR_FD) = 0 [pid 5861] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5861] close(4) = 0 [pid 5861] close(3) = 0 [pid 5861] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5861] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5861] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5861] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5861] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5861] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5861] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5861] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5861] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5861] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5861] chdir("./bus") = 0 [pid 5861] unlink("./file1") = -1 EISDIR (Is a directory) [pid 5861] exit_group(0) = ? [pid 5861] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5861, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=14 /* 0.14 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5862 attached [pid 5862] set_robust_list(0x555559447760, 24 [pid 5840] <... clone resumed>, child_tidptr=0x555559447750) = 5862 [pid 5862] <... set_robust_list resumed>) = 0 [pid 5862] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5862] setpgid(0, 0) = 0 [pid 5862] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5862] write(3, "1000", 4) = 4 executing program [pid 5862] close(3) = 0 [pid 5862] write(1, "executing program\n", 18) = 18 [pid 5862] memfd_create("syzkaller", 0) = 3 [pid 5862] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [ 99.184542][ T5861] overlay: filesystem on ./bus not supported as upperdir [pid 5862] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5862] munmap(0x7f7974000000, 138412032) = 0 [pid 5862] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5862] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5862] ioctl(4, LOOP_CLR_FD) = 0 [pid 5862] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5862] close(4) = 0 [pid 5862] close(3) = 0 [pid 5862] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5862] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5862] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5862] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5862] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5862] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5862] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5862] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5862] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5862] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5862] chdir("./bus") = 0 [pid 5862] unlink("./file1") = -1 EISDIR (Is a directory) [ 99.553931][ T5862] overlay: filesystem on ./bus not supported as upperdir [pid 5862] exit_group(0) = ? [pid 5862] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5862, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=18 /* 0.18 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5863 attached [pid 5863] set_robust_list(0x555559447760, 24) = 0 [pid 5840] <... clone resumed>, child_tidptr=0x555559447750) = 5863 [pid 5863] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5863] setpgid(0, 0) = 0 [pid 5863] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5863] write(3, "1000", 4) = 4 [pid 5863] close(3executing program ) = 0 [pid 5863] write(1, "executing program\n", 18) = 18 [pid 5863] memfd_create("syzkaller", 0) = 3 [pid 5863] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5863] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5863] munmap(0x7f7974000000, 138412032) = 0 [pid 5863] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5863] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5863] ioctl(4, LOOP_CLR_FD) = 0 [pid 5863] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5863] close(4) = 0 [pid 5863] close(3) = 0 [pid 5863] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5863] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5863] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5863] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5863] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5863] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5863] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5863] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5863] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5863] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [ 100.000177][ T5863] overlay: filesystem on ./bus not supported as upperdir [pid 5863] chdir("./bus") = 0 [pid 5863] unlink("./file1") = -1 EISDIR (Is a directory) [pid 5863] exit_group(0) = ? [pid 5863] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5863, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=16 /* 0.16 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5864 attached [pid 5864] set_robust_list(0x555559447760, 24) = 0 [pid 5864] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5864] setpgid(0, 0) = 0 [pid 5840] <... clone resumed>, child_tidptr=0x555559447750) = 5864 [pid 5864] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5864] write(3, "1000", 4) = 4 executing program [pid 5864] close(3) = 0 [pid 5864] write(1, "executing program\n", 18) = 18 [pid 5864] memfd_create("syzkaller", 0) = 3 [pid 5864] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5864] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5864] munmap(0x7f7974000000, 138412032) = 0 [pid 5864] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5864] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5864] ioctl(4, LOOP_CLR_FD) = 0 [pid 5864] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5864] close(4) = 0 [pid 5864] close(3) = 0 [pid 5864] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5864] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5864] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5864] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5864] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5864] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5864] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5864] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5864] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5864] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5864] chdir("./bus") = 0 [pid 5864] unlink("./file1") = -1 EISDIR (Is a directory) [pid 5864] exit_group(0) = ? [pid 5864] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5864, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=13 /* 0.13 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5865 attached [pid 5865] set_robust_list(0x555559447760, 24 [pid 5840] <... clone resumed>, child_tidptr=0x555559447750) = 5865 [pid 5865] <... set_robust_list resumed>) = 0 [ 100.445676][ T5864] overlay: filesystem on ./bus not supported as upperdir [pid 5865] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5865] setpgid(0, 0) = 0 [pid 5865] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5865] write(3, "1000", 4) = 4 [pid 5865] close(3) = 0 executing program [pid 5865] write(1, "executing program\n", 18) = 18 [pid 5865] memfd_create("syzkaller", 0) = 3 [pid 5865] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5865] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5865] munmap(0x7f7974000000, 138412032) = 0 [pid 5865] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5865] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5865] ioctl(4, LOOP_CLR_FD) = 0 [pid 5865] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5865] close(4) = 0 [pid 5865] close(3) = 0 [pid 5865] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5865] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5865] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5865] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5865] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5865] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5865] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5865] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5865] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5865] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5865] chdir("./bus") = 0 [ 100.840515][ T5865] overlay: filesystem on ./bus not supported as upperdir [pid 5865] unlink("./file1") = -1 EISDIR (Is a directory) [pid 5865] exit_group(0) = ? [pid 5865] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5865, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=17 /* 0.17 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5866 attached , child_tidptr=0x555559447750) = 5866 [pid 5866] set_robust_list(0x555559447760, 24) = 0 [pid 5866] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5866] setpgid(0, 0) = 0 [pid 5866] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5866] write(3, "1000", 4) = 4 [pid 5866] close(3) = 0 [pid 5866] write(1, "executing program\n", 18executing program ) = 18 [pid 5866] memfd_create("syzkaller", 0) = 3 [pid 5866] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5866] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5866] munmap(0x7f7974000000, 138412032) = 0 [pid 5866] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5866] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5866] ioctl(4, LOOP_CLR_FD) = 0 [pid 5866] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5866] close(4) = 0 [pid 5866] close(3) = 0 [pid 5866] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5866] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5866] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5866] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5866] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5866] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5866] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5866] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5866] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5866] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5866] chdir("./bus") = 0 [pid 5866] unlink("./file1") = -1 EISDIR (Is a directory) [ 101.269568][ T5866] overlay: filesystem on ./bus not supported as upperdir [pid 5866] exit_group(0) = ? [pid 5866] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5866, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=17 /* 0.17 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5867 attached [pid 5867] set_robust_list(0x555559447760, 24 [pid 5840] <... clone resumed>, child_tidptr=0x555559447750) = 5867 [pid 5867] <... set_robust_list resumed>) = 0 [pid 5867] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5867] setpgid(0, 0) = 0 [pid 5867] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5867] write(3, "1000", 4) = 4 [pid 5867] close(3) = 0 [pid 5867] write(1, "executing program\n", 18executing program ) = 18 [pid 5867] memfd_create("syzkaller", 0) = 3 [pid 5867] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5867] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5867] munmap(0x7f7974000000, 138412032) = 0 [pid 5867] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5867] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5867] ioctl(4, LOOP_CLR_FD) = 0 [pid 5867] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5867] close(4) = 0 [pid 5867] close(3) = 0 [pid 5867] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5867] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5867] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5867] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5867] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5867] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5867] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5867] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5867] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5867] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5867] chdir("./bus") = 0 [pid 5867] unlink("./file1") = -1 EISDIR (Is a directory) [ 101.680722][ T5867] overlay: filesystem on ./bus not supported as upperdir [pid 5867] exit_group(0) = ? [pid 5867] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5867, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=15 /* 0.15 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5868 attached [pid 5868] set_robust_list(0x555559447760, 24) = 0 [pid 5840] <... clone resumed>, child_tidptr=0x555559447750) = 5868 [pid 5868] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5868] setpgid(0, 0) = 0 [pid 5868] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5868] write(3, "1000", 4) = 4 [pid 5868] close(3) = 0 [pid 5868] write(1, "executing program\n", 18executing program ) = 18 [pid 5868] memfd_create("syzkaller", 0) = 3 [pid 5868] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5868] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5868] munmap(0x7f7974000000, 138412032) = 0 [pid 5868] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5868] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5868] ioctl(4, LOOP_CLR_FD) = 0 [pid 5868] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5868] close(4) = 0 [pid 5868] close(3) = 0 [pid 5868] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5868] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5868] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5868] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5868] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5868] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5868] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5868] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5868] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5868] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5868] chdir("./bus") = 0 [pid 5868] unlink("./file1") = -1 EISDIR (Is a directory) [pid 5868] exit_group(0) = ? [pid 5868] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5868, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=16 /* 0.16 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5869 attached , child_tidptr=0x555559447750) = 5869 [pid 5869] set_robust_list(0x555559447760, 24) = 0 [pid 5869] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5869] setpgid(0, 0) = 0 [pid 5869] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [ 102.068986][ T5868] overlay: filesystem on ./bus not supported as upperdir [pid 5869] write(3, "1000", 4) = 4 [pid 5869] close(3) = 0 [pid 5869] write(1, "executing program\n", 18executing program ) = 18 [pid 5869] memfd_create("syzkaller", 0) = 3 [pid 5869] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5869] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5869] munmap(0x7f7974000000, 138412032) = 0 [pid 5869] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5869] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5869] ioctl(4, LOOP_CLR_FD) = 0 [pid 5869] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5869] close(4) = 0 [pid 5869] close(3) = 0 [pid 5869] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5869] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5869] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5869] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5869] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5869] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5869] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5869] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5869] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5869] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [ 102.460058][ T5869] overlay: filesystem on ./bus not supported as upperdir [pid 5869] chdir("./bus") = 0 [pid 5869] unlink("./file1") = -1 EISDIR (Is a directory) [pid 5869] exit_group(0) = ? [pid 5869] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5869, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=15 /* 0.15 s */} --- openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5870 attached [pid 5870] set_robust_list(0x555559447760, 24) = 0 [pid 5870] prctl(PR_SET_PDEATHSIG, SIGKILL [pid 5840] <... clone resumed>, child_tidptr=0x555559447750) = 5870 [pid 5870] <... prctl resumed>) = 0 [pid 5870] setpgid(0, 0) = 0 [pid 5870] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5870] write(3, "1000", 4) = 4 [pid 5870] close(3) = 0 [pid 5870] write(1, "executing program\n", 18executing program ) = 18 [pid 5870] memfd_create("syzkaller", 0) = 3 [pid 5870] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5870] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5870] munmap(0x7f7974000000, 138412032) = 0 [pid 5870] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5870] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5870] ioctl(4, LOOP_CLR_FD) = 0 [pid 5870] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5870] close(4) = 0 [pid 5870] close(3) = 0 [pid 5870] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5870] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5870] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5870] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5870] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5870] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5870] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5870] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5870] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5870] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [ 102.983553][ T5870] overlay: filesystem on ./bus not supported as upperdir [pid 5870] chdir("./bus") = 0 [pid 5870] unlink("./file1") = -1 EISDIR (Is a directory) [pid 5870] exit_group(0) = ? [pid 5870] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5870, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=15 /* 0.15 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5871 attached , child_tidptr=0x555559447750) = 5871 [pid 5871] set_robust_list(0x555559447760, 24) = 0 [pid 5871] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5871] setpgid(0, 0) = 0 [pid 5871] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5871] write(3, "1000", 4) = 4 [pid 5871] close(3) = 0 executing program [pid 5871] write(1, "executing program\n", 18) = 18 [pid 5871] memfd_create("syzkaller", 0) = 3 [pid 5871] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5871] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5871] munmap(0x7f7974000000, 138412032) = 0 [pid 5871] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5871] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5871] ioctl(4, LOOP_CLR_FD) = 0 [pid 5871] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5871] close(4) = 0 [pid 5871] close(3) = 0 [pid 5871] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5871] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5871] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5871] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5871] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5871] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5871] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5871] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5871] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5871] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5871] chdir("./bus") = 0 [pid 5871] unlink("./file1") = -1 EISDIR (Is a directory) [pid 5871] exit_group(0) = ? [pid 5871] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5871, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=12 /* 0.12 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5872 attached [pid 5872] set_robust_list(0x555559447760, 24) = 0 [pid 5872] prctl(PR_SET_PDEATHSIG, SIGKILL [pid 5840] <... clone resumed>, child_tidptr=0x555559447750) = 5872 [pid 5872] <... prctl resumed>) = 0 [pid 5872] setpgid(0, 0) = 0 [pid 5872] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [ 103.426756][ T5871] overlay: filesystem on ./bus not supported as upperdir [pid 5872] write(3, "1000", 4) = 4 executing program [pid 5872] close(3) = 0 [pid 5872] write(1, "executing program\n", 18) = 18 [pid 5872] memfd_create("syzkaller", 0) = 3 [pid 5872] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5872] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5872] munmap(0x7f7974000000, 138412032) = 0 [pid 5872] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5872] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5872] ioctl(4, LOOP_CLR_FD) = 0 [pid 5872] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5872] close(4) = 0 [pid 5872] close(3) = 0 [pid 5872] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5872] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5872] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5872] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5872] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5872] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5872] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5872] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5872] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5872] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5872] chdir("./bus") = 0 [ 103.788579][ T5872] overlay: filesystem on ./bus not supported as upperdir [pid 5872] unlink("./file1") = -1 EISDIR (Is a directory) [pid 5872] exit_group(0) = ? [pid 5872] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5872, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=14 /* 0.14 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5874 attached [pid 5874] set_robust_list(0x555559447760, 24) = 0 [pid 5840] <... clone resumed>, child_tidptr=0x555559447750) = 5874 [pid 5874] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5874] setpgid(0, 0) = 0 [pid 5874] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5874] write(3, "1000", 4) = 4 [pid 5874] close(3executing program ) = 0 [pid 5874] write(1, "executing program\n", 18) = 18 [pid 5874] memfd_create("syzkaller", 0) = 3 [pid 5874] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5874] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5874] munmap(0x7f7974000000, 138412032) = 0 [pid 5874] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5874] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5874] ioctl(4, LOOP_CLR_FD) = 0 [pid 5874] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5874] close(4) = 0 [pid 5874] close(3) = 0 [pid 5874] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5874] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5874] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5874] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5874] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5874] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5874] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5874] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5874] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5874] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5874] chdir("./bus") = 0 [pid 5874] unlink("./file1") = -1 EISDIR (Is a directory) [pid 5874] exit_group(0) = ? [pid 5874] +++ exited with 0 +++ [ 104.242458][ T5874] overlay: filesystem on ./bus not supported as upperdir --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5874, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=13 /* 0.13 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5875 attached [pid 5875] set_robust_list(0x555559447760, 24) = 0 [pid 5840] <... clone resumed>, child_tidptr=0x555559447750) = 5875 [pid 5875] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5875] setpgid(0, 0) = 0 [pid 5875] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5875] write(3, "1000", 4) = 4 [pid 5875] close(3) = 0 executing program [pid 5875] write(1, "executing program\n", 18) = 18 [pid 5875] memfd_create("syzkaller", 0) = 3 [pid 5875] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000 [pid 5875] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216 [pid 5875] munmap(0x7f7974000000, 138412032) = 0 [pid 5875] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5875] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5875] ioctl(4, LOOP_CLR_FD) = 0 [pid 5875] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy) [pid 5875] close(4) = 0 [pid 5875] close(3) = 0 [pid 5875] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5875] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5875] mkdir("./file1", 000) = -1 EEXIST (File exists) [pid 5875] mkdir("./file0", 000) = -1 EEXIST (File exists) [pid 5875] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,nfs_export=on,") = -1 EINVAL (Invalid argument) [pid 5875] openat(AT_FDCWD, "./file0", O_RDONLY) = 3 [pid 5875] symlinkat("./file1/file0", 3, "./file1") = -1 EEXIST (File exists) [pid 5875] mkdir("./bus", 0777) = -1 EEXIST (File exists) [pid 5875] mount(NULL, "./bus", 0x200000000000, MS_SHARED, 0x7ffcbf231f70) = 0 [pid 5875] openat(AT_FDCWD, "./bus", O_RDONLY|O_DIRECTORY) = 4 [pid 5875] chdir("./bus") = 0 [pid 5875] unlink("./file1") = -1 EISDIR (Is a directory) [pid 5875] exit_group(0) = ? [pid 5875] +++ exited with 0 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5875, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=14 /* 0.14 s */} --- restart_syscall(<... resuming interrupted clone ...>) = 0 openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3 ioctl(3, LOOP_CLR_FD) = 0 close(3) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5876 attached [pid 5876] set_robust_list(0x555559447760, 24 [pid 5840] <... clone resumed>, child_tidptr=0x555559447750) = 5876 [pid 5876] <... set_robust_list resumed>) = 0 [pid 5876] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5876] setpgid(0, 0) = 0 [ 104.670289][ T5875] overlay: filesystem on ./bus not supported as upperdir executing program [pid 5876] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5876] write(3, "1000", 4) = 4 [pid 5876] close(3) = 0 [pid 5876] write(1, "executing program\n", 18) = 18 [pid 5876] memfd_create("syzkaller", 0) = 3 [pid 5876] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7974000000