./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor982977312 <...> Warning: Permanently added '10.128.0.254' (ED25519) to the list of known hosts. execve("./syz-executor982977312", ["./syz-executor982977312"], 0x7ffd7efbf350 /* 10 vars */) = 0 brk(NULL) = 0x555555f86000 brk(0x555555f86d00) = 0x555555f86d00 arch_prctl(ARCH_SET_FS, 0x555555f86380) = 0 set_tid_address(0x555555f86650) = 5006 set_robust_list(0x555555f86660, 24) = 0 rseq(0x555555f86ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor982977312", 4096) = 27 getrandom("\xa9\x9b\x95\xc1\x27\x99\x41\x71", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555555f86d00 brk(0x555555fa7d00) = 0x555555fa7d00 brk(0x555555fa8000) = 0x555555fa8000 mprotect(0x7f97c2c30000, 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 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, child_tidptr=0x555555f86650) = 5007 ./strace-static-x86_64: Process 5007 attached [pid 5007] set_robust_list(0x555555f86660, 24) = 0 [pid 5007] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5007] setpgid(0, 0) = 0 [pid 5007] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5007] write(3, "1000", 4) = 4 [pid 5007] close(3) = 0 [pid 5007] memfd_create("syzkaller", 0) = 3 [pid 5007] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f97ba600000 [pid 5007] write(3, "\x60\x1c\x6d\x6b\x64\x6f\x73\x66\xe4\x17\x98\x00\x08\x08\x01\x00\x02\x40\x00\x40\x00\xf8\x01\x00\x10\x00\x02\x00\x00\x00\x00\x00\x00\x00\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\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 131072) = 131072 [pid 5007] munmap(0x7f97ba600000, 138412032) = 0 [pid 5007] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4 [pid 5007] ioctl(4, LOOP_SET_FD, 3) = 0 [pid 5007] close(3) = 0 [pid 5007] close(4) = 0 [pid 5007] mkdir("./file1", 0777) = 0 [ 166.009776][ T5007] loop0: detected capacity change from 0 to 256 [pid 5007] mount("/dev/loop0", "./file1", "msdos", MS_NOSUID|MS_MANDLOCK|MS_RELATIME, "nfs=nostale_ro,sys_immutable,nodots,sys_immutable,nodots,dots,dots") = 0 [pid 5007] openat(AT_FDCWD, "./file1", O_RDONLY|O_DIRECTORY) = 3 [pid 5007] chdir("./file1") = 0 [pid 5007] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = -1 EBUSY (Device or resource busy) [pid 5007] openat(AT_FDCWD, ".", O_RDONLY) = 4 [ 166.057136][ T5007] ======================================================= [ 166.057136][ T5007] WARNING: The mand mount option has been deprecated and [ 166.057136][ T5007] and is ignored by this kernel. Remove the mand [ 166.057136][ T5007] option from the mount to silence this warning. [ 166.057136][ T5007] ======================================================= [ 166.109502][ T5007] ===================================================== [ 166.117535][ T5007] BUG: KMSAN: kernel-infoleak in _copy_to_user+0xbc/0x100 [ 166.125040][ T5007] _copy_to_user+0xbc/0x100 [ 166.129786][ T5007] __se_sys_name_to_handle_at+0x949/0xb10 [ 166.136018][ T5007] __x64_sys_name_to_handle_at+0xe4/0x140 [ 166.142099][ T5007] do_syscall_64+0xcf/0x1e0 [ 166.146777][ T5007] entry_SYSCALL_64_after_hwframe+0x63/0x6b [ 166.153278][ T5007] [ 166.155721][ T5007] Uninit was created at: [ 166.160225][ T5007] __kmalloc+0x919/0xf80 [ 166.164989][ T5007] __se_sys_name_to_handle_at+0x441/0xb10 [ 166.170983][ T5007] __x64_sys_name_to_handle_at+0xe4/0x140 [ 166.177210][ T5007] do_syscall_64+0xcf/0x1e0 [ 166.182093][ T5007] entry_SYSCALL_64_after_hwframe+0x63/0x6b [ 166.188279][ T5007] [ 166.190723][ T5007] Bytes 18-19 of 20 are uninitialized [ 166.196431][ T5007] Memory access of size 20 starts at ffff88812c04f880 [ 166.203464][ T5007] Data copied to user address 0000000020000240 [ 166.209724][ T5007] [ 166.212345][ T5007] CPU: 1 PID: 5007 Comm: syz-executor982 Not tainted 6.8.0-rc6-syzkaller-00250-g04b8076df253 #0 [ 166.223205][ T5007] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 [ 166.233623][ T5007] ===================================================== [ 166.240708][ T5007] Disabling lock debugging due to kernel taint [ 166.247131][ T5007] Kernel panic - not syncing: kmsan.panic set ... [ 166.253693][ T5007] CPU: 1 PID: 5007 Comm: syz-executor982 Tainted: G B 6.8.0-rc6-syzkaller-00250-g04b8076df253 #0 [ 166.265804][ T5007] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 [ 166.275981][ T5007] Call Trace: [ 166.279399][ T5007] [ 166.282444][ T5007] dump_stack_lvl+0x1bf/0x240 [ 166.287297][ T5007] dump_stack+0x1e/0x20 [ 166.291616][ T5007] panic+0x4de/0xc90 [ 166.295781][ T5007] kmsan_report+0x2d0/0x2d0 [ 166.300516][ T5007] ? kmsan_internal_poison_memory+0x7d/0x90 [ 166.307047][ T5007] ? kmsan_internal_check_memory+0x485/0x550 [ 166.313308][ T5007] ? kmsan_copy_to_user+0xd3/0xf0 [ 166.318545][ T5007] ? _copy_to_user+0xbc/0x100 [ 166.323439][ T5007] ? __se_sys_name_to_handle_at+0x949/0xb10 [ 166.329587][ T5007] ? __x64_sys_name_to_handle_at+0xe4/0x140 [ 166.335674][ T5007] ? do_syscall_64+0xcf/0x1e0 [ 166.340571][ T5007] ? entry_SYSCALL_64_after_hwframe+0x63/0x6b [ 166.346885][ T5007] ? do_syscall_64+0xcf/0x1e0 [ 166.351712][ T5007] ? entry_SYSCALL_64_after_hwframe+0x63/0x6b [ 166.358051][ T5007] ? kmsan_get_metadata+0x146/0x1c0 [ 166.363480][ T5007] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 166.369490][ T5007] ? kmsan_get_metadata+0x146/0x1c0 [ 166.374885][ T5007] ? kmsan_internal_set_shadow_origin+0x66/0xe0 [ 166.381401][ T5007] ? kmsan_get_metadata+0x146/0x1c0 [ 166.386725][ T5007] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 166.392776][ T5007] ? kmsan_get_metadata+0x146/0x1c0 [ 166.398277][ T5007] ? kmsan_internal_set_shadow_origin+0x66/0xe0 [ 166.404734][ T5007] ? kmsan_get_metadata+0x146/0x1c0 [ 166.410156][ T5007] ? kmsan_get_shadow_origin_ptr+0x4d/0xb0 [ 166.416177][ T5007] kmsan_internal_check_memory+0x485/0x550 [ 166.422212][ T5007] kmsan_copy_to_user+0xd3/0xf0 [ 166.427276][ T5007] ? should_fail_usercopy+0x2e/0x40 [ 166.432723][ T5007] _copy_to_user+0xbc/0x100 [ 166.437448][ T5007] __se_sys_name_to_handle_at+0x949/0xb10 [ 166.443522][ T5007] __x64_sys_name_to_handle_at+0xe4/0x140 [ 166.449463][ T5007] do_syscall_64+0xcf/0x1e0 [ 166.454199][ T5007] entry_SYSCALL_64_after_hwframe+0x63/0x6b [ 166.460599][ T5007] RIP: 0033:0x7f97c2bbcad9 [ 166.465143][ T5007] 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 [ 166.484924][ T5007] RSP: 002b:00007ffd0a84df08 EFLAGS: 00000246 ORIG_RAX: 000000000000012f [ 166.493495][ T5007] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f97c2bbcad9 [ 166.501655][ T5007] RDX: 0000000020000240 RSI: 0000000020000140 RDI: 0000000000000004 [ 166.509865][ T5007] RBP: 00007f97c2c305f0 R08: 0000000000000000 R09: 0000555555f874c0 [ 166.517977][ T5007] R10: 00000000200000c0 R11: 0000000000000246 R12: 00007ffd0a84df30 [ 166.526143][ T5007] R13: 00007ffd0a84e158 R14: 431bde82d7b634db R15: 00007f97c2c0503b [ 166.534335][ T5007] [ 166.537781][ T5007] Kernel Offset: disabled [ 166.542184][ T5007] Rebooting in 86400 seconds..