./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor758032530 <...> Warning: Permanently added '10.128.1.1' (ECDSA) to the list of known hosts. execve("./syz-executor758032530", ["./syz-executor758032530"], 0x7ffe236f6850 /* 10 vars */) = 0 brk(NULL) = 0x555556b68000 brk(0x555556b68c40) = 0x555556b68c40 arch_prctl(ARCH_SET_FS, 0x555556b68300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 set_tid_address(0x555556b685d0) = 293 set_robust_list(0x555556b685e0, 24) = 0 rt_sigaction(SIGRTMIN, {sa_handler=0x7fd9c649b2b0, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7fd9c649b980}, NULL, 8) = 0 rt_sigaction(SIGRT_1, {sa_handler=0x7fd9c649b350, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO, sa_restorer=0x7fd9c649b980}, NULL, 8) = 0 rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor758032530", 4096) = 27 brk(0x555556b89c40) = 0x555556b89c40 brk(0x555556b8a000) = 0x555556b8a000 mprotect(0x7fd9c655d000, 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 futex(0x7fd9c65634cc, FUTEX_WAKE_PRIVATE, 1000000) = 0 mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7fd9c646b000 mprotect(0x7fd9c646c000, 131072, PROT_READ|PROT_WRITE) = 0 clone(child_stack=0x7fd9c648b3f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[294], tls=0x7fd9c648b700, child_tidptr=0x7fd9c648b9d0) = 294 ./strace-static-x86_64: Process 294 attached [pid 293] futex(0x7fd9c65634c8, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 293] futex(0x7fd9c65634cc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 294] set_robust_list(0x7fd9c648b9e0, 24) = 0 [pid 294] mkdirat(AT_FDCWD, "./file0", 000) = 0 [pid 294] futex(0x7fd9c65634cc, FUTEX_WAKE_PRIVATE, 1000000 [pid 293] <... futex resumed>) = 0 [pid 293] futex(0x7fd9c65634c8, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 293] futex(0x7fd9c65634cc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 294] <... futex resumed>) = 1 [pid 294] openat(AT_FDCWD, "/dev/fuse", O_RDWR) = 3 [pid 294] futex(0x7fd9c65634cc, FUTEX_WAKE_PRIVATE, 1000000 [pid 293] <... futex resumed>) = 0 [pid 293] futex(0x7fd9c65634c8, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 293] futex(0x7fd9c65634cc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 294] <... futex resumed>) = 1 [pid 294] mount(NULL, "./file0", "fuse", 0, "fd=0x0000000000000003,rootmode=00000000000000000040000,user_id=00000000000000000000,group_id=0000000"...) = 0 [pid 294] futex(0x7fd9c65634cc, FUTEX_WAKE_PRIVATE, 1000000 [pid 293] <... futex resumed>) = 0 [pid 293] futex(0x7fd9c65634c8, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 293] futex(0x7fd9c65634cc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 294] <... futex resumed>) = 1 [pid 294] read(3, "\x68\x00\x00\x00\x1a\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x07\x00\x00\x00\x25\x00\x00\x00\x00\x00\x02\x00\xfb\xff\xff\x73\x01\x00\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 8192) = 104 [pid 294] write(3, "\x50\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x07\x00\x00\x00\x26\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 80) = 80 [pid 294] futex(0x7fd9c65634cc, FUTEX_WAKE_PRIVATE, 1000000 [pid 293] <... futex resumed>) = 0 [pid 293] futex(0x7fd9c65634c8, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 293] futex(0x7fd9c65634cc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 294] <... futex resumed>) = 1 [ 23.932084][ T28] audit: type=1400 audit(1684075851.300:66): avc: denied { execmem } for pid=293 comm="syz-executor758" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 23.954323][ T28] audit: type=1400 audit(1684075851.330:67): avc: denied { read write } for pid=293 comm="syz-executor758" name="fuse" dev="devtmpfs" ino=92 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fuse_device_t tclass=chr_file permissive=1 [pid 294] mount(NULL, "./file0/file0/file0", NULL, 0, NULL [pid 293] <... futex resumed>) = -1 ETIMEDOUT (Connection timed out) [pid 293] futex(0x7fd9c65634dc, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 293] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7fd9c644a000 [pid 293] mprotect(0x7fd9c644b000, 131072, PROT_READ|PROT_WRITE) = 0 [pid 293] clone(child_stack=0x7fd9c646a3f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[296], tls=0x7fd9c646a700, child_tidptr=0x7fd9c646a9d0) = 296 [pid 293] futex(0x7fd9c65634d8, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 293] futex(0x7fd9c65634dc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 296 attached [pid 296] set_robust_list(0x7fd9c646a9e0, 24) = 0 [pid 296] read(3, "\x2e\x00\x00\x00\x01\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x26\x01\x00\x00\x00\x00\x00\x00\x66\x69\x6c\x65\x30\x00", 8224) = 46 [pid 296] futex(0x7fd9c65634dc, FUTEX_WAKE_PRIVATE, 1000000 [pid 293] <... futex resumed>) = 0 [pid 293] futex(0x7fd9c65634d8, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 293] futex(0x7fd9c65634dc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 296] <... futex resumed>) = 1 [ 23.977972][ T28] audit: type=1400 audit(1684075851.330:68): avc: denied { open } for pid=293 comm="syz-executor758" path="/dev/fuse" dev="devtmpfs" ino=92 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fuse_device_t tclass=chr_file permissive=1 [ 24.001378][ T28] audit: type=1400 audit(1684075851.330:69): avc: denied { mounton } for pid=293 comm="syz-executor758" path="/root/file0" dev="sda1" ino=1927 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_home_t tclass=dir permissive=1 [pid 296] write(3, "\xa0\x00\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 160) = 160 [pid 296] futex(0x7fd9c65634dc, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 296] futex(0x7fd9c65634d8, FUTEX_WAIT_PRIVATE, 0, NULL [pid 293] <... futex resumed>) = 0 [ 24.012031][ T294] general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN [ 24.024142][ T28] audit: type=1400 audit(1684075851.330:70): avc: denied { mount } for pid=293 comm="syz-executor758" name="/" dev="fuse" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fusefs_t tclass=filesystem permissive=1 [ 24.035371][ T294] KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] [ 24.035387][ T294] CPU: 1 PID: 294 Comm: syz-executor758 Not tainted 6.1.25-syzkaller-00149-g6f4553626dbd #0 [ 24.075396][ T294] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 [ 24.085280][ T294] RIP: 0010:step_into+0x1c4/0x1090 [ 24.090234][ T294] Code: c0 0f 85 bb 0b 00 00 44 8b 3b 43 80 3c 34 00 74 0a 48 8b 7c 24 10 e8 5b 23 f3 ff 48 8b 9c 24 d8 00 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 a8 0b 00 00 8b 1b 89 de 81 e6 00 00 07 [ 24.109671][ T294] RSP: 0018:ffffc90000dc78a0 EFLAGS: 00010202 [ 24.115568][ T294] RAX: 0000000000000002 RBX: 0000000000000010 RCX: ffff88810db3a600 [ 24.123383][ T294] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [pid 293] exit_group(0) = ? [pid 296] <... futex resumed>) = ? [pid 296] +++ exited with 0 +++ [ 24.131193][ T294] RBP: ffffc90000dc79f0 R08: ffffffff81c5d769 R09: ffffed1022427495 [ 24.139003][ T294] R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920001b8f2f [ 24.146817][ T294] R13: ffffc90000dc7c20 R14: dffffc0000000000 R15: 0000000000000011 [ 24.154624][ T294] FS: 00007fd9c648b700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 [ 24.163391][ T294] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.169814][ T294] CR2: 00007fd9c646a718 CR3: 000000011f515000 CR4: 00000000003506a0 [ 24.177628][ T294] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.185435][ T294] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.193247][ T294] Call Trace: [ 24.196372][ T294] [ 24.199153][ T294] ? __lookup_slow+0x36e/0x3e0 [ 24.203752][ T294] ? lookup_one_len+0x2c0/0x2c0 [ 24.208450][ T294] ? set_root+0x400/0x400 [ 24.212601][ T294] ? up_read+0x5a/0x180 [ 24.216595][ T294] link_path_walk+0x72c/0xee0 [ 24.221112][ T294] ? handle_lookup_down+0x130/0x130 [ 24.226145][ T294] path_lookupat+0xa0/0x450 [ 24.230483][ T294] filename_lookup+0x251/0x600 [ 24.235083][ T294] ? hashlen_string+0x120/0x120 [ 24.239777][ T294] ? strncpy_from_user+0x169/0x2b0 [ 24.244869][ T294] ? getname_flags+0x1fd/0x520 [ 24.249467][ T294] user_path_at_empty+0x43/0x1a0 [ 24.254241][ T294] __se_sys_mount+0x285/0x3b0 [ 24.258758][ T294] ? __x64_sys_mount+0xd0/0xd0 [ 24.263352][ T294] ? fpregs_restore_userregs+0x130/0x290 [ 24.268824][ T294] __x64_sys_mount+0xbf/0xd0 [ 24.273248][ T294] do_syscall_64+0x3d/0xb0 [ 24.277501][ T294] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 24.283226][ T294] RIP: 0033:0x7fd9c64d9469 [ 24.287481][ T294] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 14 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 [ 24.306924][ T294] RSP: 002b:00007fd9c648b2f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 24.315257][ T294] RAX: ffffffffffffffda RBX: 00007fd9c65634c0 RCX: 00007fd9c64d9469 [ 24.323066][ T294] RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000000 [ 24.330881][ T294] RBP: 00007fd9c653101c R08: 0000000000000000 R09: 0000000000000000 [ 24.338699][ T294] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 24.346499][ T294] R13: 0000000000000003 R14: 00007fd9c6531038 R15: 00007fd9c65634c8 [ 24.354321][ T294] [ 24.357177][ T294] Modules linked in: [ 24.361584][ T294] ---[ end trace 0000000000000000 ]--- [ 24.366879][ T294] RIP: 0010:step_into+0x1c4/0x1090 [ 24.371808][ T294] Code: c0 0f 85 bb 0b 00 00 44 8b 3b 43 80 3c 34 00 74 0a 48 8b 7c 24 10 e8 5b 23 f3 ff 48 8b 9c 24 d8 00 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 a8 0b 00 00 8b 1b 89 de 81 e6 00 00 07 [ 24.391284][ T294] RSP: 0018:ffffc90000dc78a0 EFLAGS: 00010202 [ 24.397174][ T294] RAX: 0000000000000002 RBX: 0000000000000010 RCX: ffff88810db3a600 [ 24.405012][ T294] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 24.412775][ T294] RBP: ffffc90000dc79f0 R08: ffffffff81c5d769 R09: ffffed1022427495 [ 24.420623][ T294] R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920001b8f2f [ 24.428406][ T294] R13: ffffc90000dc7c20 R14: dffffc0000000000 R15: 0000000000000011 [ 24.436221][ T294] FS: 00007fd9c648b700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 [ 24.444992][ T294] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.451398][ T294] CR2: 00007fd9c646a718 CR3: 000000011f515000 CR4: 00000000003506a0 [ 24.459367][ T294] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.467151][ T294] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.474969][ T294] Kernel panic - not syncing: Fatal exception [ 24.481147][ T294] Kernel Offset: disabled [ 24.485292][ T294] Rebooting in 86400 seconds..