./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor834573780 <...> Warning: Permanently added '10.128.0.53' (ED25519) to the list of known hosts. execve("./syz-executor834573780", ["./syz-executor834573780"], 0x7fffcdfd2490 /* 10 vars */) = 0 brk(NULL) = 0x555586251000 brk(0x555586251e00) = 0x555586251e00 arch_prctl(ARCH_SET_FS, 0x555586251480) = 0 set_tid_address(0x555586251750) = 5241 set_robust_list(0x555586251760, 24) = 0 rseq(0x555586251da0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor834573780", 4096) = 27 getrandom("\xdc\x60\x96\xf2\x08\xf0\xf5\x60", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555586251e00 brk(0x555586272e00) = 0x555586272e00 brk(0x555586273000) = 0x555586273000 mprotect(0x7f992f4bf000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 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=0x7f992f417970, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7f992f41f570}, NULL, 8) = 0 rt_sigaction(SIGBUS, {sa_handler=0x7f992f417970, sa_mask=[], sa_flags=SA_RESTORER|SA_NODEFER|SA_SIGINFO, sa_restorer=0x7f992f41f570}, 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 5243 attached , child_tidptr=0x555586251750) = 5243 [pid 5243] set_robust_list(0x555586251760, 24) = 0 [pid 5243] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5243] setpgid(0, 0) = 0 [pid 5243] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5243] write(3, "1000", 4) = 4 [pid 5243] close(3) = 0 [pid 5243] write(1, "executing program\n", 18executing program ) = 18 [pid 5243] mkdir("./file0", 0777) = 0 [pid 5243] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} --- [pid 5243] mkdirat(AT_FDCWD, "./file1", 000) = 0 [pid 5243] mkdir("./bus", 000) = 0 [pid 5243] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = 0 [pid 5243] chdir("./bus") = 0 [pid 5243] openat(AT_FDCWD, ".", O_WRONLY|O_SYNC|O_DIRECT|O_TMPFILE, 000) = 3 [pid 5243] exit_group(0) = ? [ 71.819500][ T5243] Oops: general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] PREEMPT SMP KASAN PTI [ 71.832511][ T5243] KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f] [ 71.841041][ T5243] CPU: 1 UID: 0 PID: 5243 Comm: syz-executor834 Not tainted 6.12.0-rc2-next-20241011-syzkaller #0 [ 71.851733][ T5243] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 [ 71.861895][ T5243] RIP: 0010:ovl_real_file_path+0xa5/0x2e0 [ 71.867686][ T5243] Code: 03 4d 89 f7 42 80 3c 30 00 74 08 4c 89 ef e8 22 1e e0 fe 4c 89 64 24 10 49 8b 45 00 49 89 c4 4c 8d 70 68 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 fc 1d e0 fe 49 8b 1e 48 83 c5 68 [ 71.887321][ T5243] RSP: 0018:ffffc90002f0fb28 EFLAGS: 00010202 [ 71.893601][ T5243] RAX: 000000000000000d RBX: 1ffff920005e1f79 RCX: ffff88801e3a0000 [ 71.901670][ T5243] RDX: 0000000000000000 RSI: ffffc90002f0fbc0 RDI: ffff88807a90fc00 [ 71.909661][ T5243] RBP: ffff888079f31780 R08: ffffffff831d82d9 R09: 0000000000000000 [ 71.917728][ T5243] R10: ffffc90002f0fae0 R11: fffff520005e1f5e R12: 0000000000000000 [ 71.925812][ T5243] R13: ffff888077bfe000 R14: 0000000000000068 R15: dffffc0000000000 [ 71.933816][ T5243] FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 [ 71.942756][ T5243] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 71.949362][ T5243] CR2: 0000000020001000 CR3: 000000000e736000 CR4: 00000000003526f0 [ 71.957375][ T5243] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 71.965368][ T5243] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 71.973355][ T5243] Call Trace: [ 71.976641][ T5243] [ 71.979617][ T5243] ? __die_body+0x5f/0xb0 [ 71.983969][ T5243] ? die_addr+0xb0/0xe0 [ 71.988137][ T5243] ? exc_general_protection+0x3dd/0x5d0 [ 71.993708][ T5243] ? asm_exc_general_protection+0x26/0x30 [ 71.999447][ T5243] ? ovl_path_realdata+0x79/0x370 [ 72.004495][ T5243] ? ovl_real_file_path+0xa5/0x2e0 [ 72.009636][ T5243] ? ovl_real_file_path+0x23/0x2e0 [ 72.015229][ T5243] ovl_real_file+0x186/0x210 [ 72.019880][ T5243] ? __pfx_ovl_real_file+0x10/0x10 [ 72.025011][ T5243] ovl_flush+0x22/0x140 [ 72.029174][ T5243] ? filp_flush+0xab/0x160 [ 72.033614][ T5243] ? __pfx_ovl_flush+0x10/0x10 [ 72.038404][ T5243] filp_flush+0xb7/0x160 [ 72.042679][ T5243] filp_close+0x1e/0x40 [ 72.046846][ T5243] put_files_struct+0x198/0x310 [ 72.051707][ T5243] do_exit+0xa10/0x28e0 [ 72.055873][ T5243] ? __pfx_do_exit+0x10/0x10 [ 72.060466][ T5243] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 72.066478][ T5243] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 72.072817][ T5243] ? _raw_spin_unlock_irq+0x23/0x50 [ 72.078026][ T5243] ? lockdep_hardirqs_on+0x99/0x150 [ 72.083238][ T5243] do_group_exit+0x207/0x2c0 [ 72.087851][ T5243] __x64_sys_exit_group+0x3f/0x40 [ 72.092901][ T5243] x64_sys_call+0x2634/0x2640 [ 72.097590][ T5243] do_syscall_64+0xf3/0x230 [ 72.102109][ T5243] ? clear_bhb_loop+0x35/0x90 [ 72.106876][ T5243] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 72.112780][ T5243] RIP: 0033:0x7f992f44a689 [ 72.117206][ T5243] Code: Unable to access opcode bytes at 0x7f992f44a65f. [ 72.124220][ T5243] RSP: 002b:00007fffd98bf338 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 72.132652][ T5243] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f992f44a689 [ 72.140661][ T5243] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 72.148659][ T5243] RBP: 00007f992f4c52b0 R08: ffffffffffffffb8 R09: 00007fffd98bf3c0 [ 72.156814][ T5243] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f992f4c52b0 [ 72.164882][ T5243] R13: 0000000000000000 R14: 00007f992f4c5d00 R15: 00007f992f418670 [ 72.172965][ T5243] [ 72.176106][ T5243] Modules linked in: [ 72.180696][ T5243] ---[ end trace 0000000000000000 ]--- [ 72.186291][ T5243] RIP: 0010:ovl_real_file_path+0xa5/0x2e0 [ 72.192074][ T5243] Code: 03 4d 89 f7 42 80 3c 30 00 74 08 4c 89 ef e8 22 1e e0 fe 4c 89 64 24 10 49 8b 45 00 49 89 c4 4c 8d 70 68 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 fc 1d e0 fe 49 8b 1e 48 83 c5 68 [ 72.211789][ T5243] RSP: 0018:ffffc90002f0fb28 EFLAGS: 00010202 [ 72.217966][ T5243] RAX: 000000000000000d RBX: 1ffff920005e1f79 RCX: ffff88801e3a0000 [ 72.226072][ T5243] RDX: 0000000000000000 RSI: ffffc90002f0fbc0 RDI: ffff88807a90fc00 [ 72.234061][ T5243] RBP: ffff888079f31780 R08: ffffffff831d82d9 R09: 0000000000000000 [ 72.242086][ T5243] R10: ffffc90002f0fae0 R11: fffff520005e1f5e R12: 0000000000000000 [ 72.250125][ T5243] R13: ffff888077bfe000 R14: 0000000000000068 R15: dffffc0000000000 [ 72.258190][ T5243] FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 [ 72.267276][ T5243] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 72.273891][ T5243] CR2: 00007f992f4c6110 CR3: 000000000e736000 CR4: 00000000003526f0 [ 72.281943][ T5243] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 72.290012][ T5243] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 72.298039][ T5243] Kernel panic - not syncing: Fatal exception [ 72.304481][ T5243] Kernel Offset: disabled [ 72.308832][ T5243] Rebooting in 86400 seconds..