./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor4139926247 <...> syzkaller login: [ 95.143405][ T123] cfg80211: failed to load regulatory.db Warning: Permanently added '10.128.0.99' (ECDSA) to the list of known hosts. execve("./syz-executor4139926247", ["./syz-executor4139926247"], 0x7ffc68eecaa0 /* 10 vars */) = 0 brk(NULL) = 0x555557373000 brk(0x555557373c40) = 0x555557373c40 arch_prctl(ARCH_SET_FS, 0x555557373300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor4139926247", 4096) = 28 brk(0x555557394c40) = 0x555557394c40 brk(0x555557395000) = 0x555557395000 mprotect(0x7fcb75c53000, 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 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555573735d0) = 3480 ./strace-static-x86_64: Process 3480 attached [pid 3480] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 3480] setpgid(0, 0) = 0 [pid 3480] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 3480] write(3, "1000", 4) = 4 [pid 3480] close(3) = 0 [pid 3480] mkdir("./file0", 000) = 0 [pid 3480] mount(NULL, "./file0", "ramfs", 0, NULL) = 0 [pid 3480] chdir("./file0") = 0 [ 99.724740][ T3480] ===================================================== [ 99.731914][ T3480] BUG: KMSAN: uninit-value in __page_symlink+0x2c2/0x350 [ 99.738985][ T3480] __page_symlink+0x2c2/0x350 [ 99.743830][ T3480] page_symlink+0x70/0x90 [ 99.748222][ T3480] ramfs_symlink+0x32c/0x650 [ 99.753058][ T3480] vfs_symlink+0x41c/0x610 [ 99.757511][ T3480] do_symlinkat+0x26c/0x930 [ 99.762259][ T3480] __x64_sys_symlink+0xe0/0x130 [ 99.767148][ T3480] do_syscall_64+0x3d/0xb0 [ 99.771605][ T3480] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 99.777632][ T3480] [ 99.779961][ T3480] Local variable fsdata created at: [ 99.785323][ T3480] __page_symlink+0x8c/0x350 [ 99.789961][ T3480] page_symlink+0x70/0x90 [ 99.794613][ T3480] [ 99.796942][ T3480] CPU: 0 PID: 3480 Comm: syz-executor413 Not tainted 5.18.0-syzkaller-16263-g2d0ce79ea812 #0 [ 99.807967][ T3480] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 99.818151][ T3480] ===================================================== [ 99.825304][ T3480] Disabling lock debugging due to kernel taint [ 99.831468][ T3480] Kernel panic - not syncing: kmsan.panic set ... [ 99.837884][ T3480] CPU: 0 PID: 3480 Comm: syz-executor413 Tainted: G B 5.18.0-syzkaller-16263-g2d0ce79ea812 #0 [ 99.849444][ T3480] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 99.859517][ T3480] Call Trace: [ 99.862807][ T3480] [ 99.865743][ T3480] dump_stack_lvl+0x1c8/0x256 [ 99.870480][ T3480] dump_stack+0x1a/0x1c [ 99.874714][ T3480] panic+0x4d3/0xc69 [ 99.878702][ T3480] ? get_taint+0x1/0x50 [ 99.882912][ T3480] ? add_taint+0x104/0x1a0 [ 99.887367][ T3480] ? console_unlock+0x1c70/0x20c0 [ 99.892419][ T3480] kmsan_report+0x2cc/0x2d0 [ 99.896982][ T3480] ? __filemap_get_folio+0x1703/0x1b30 [ 99.902582][ T3480] ? __msan_warning+0x92/0x110 [ 99.907397][ T3480] ? __page_symlink+0x2c2/0x350 [ 99.912275][ T3480] ? page_symlink+0x70/0x90 [ 99.916818][ T3480] ? ramfs_symlink+0x32c/0x650 [ 99.921613][ T3480] ? vfs_symlink+0x41c/0x610 [ 99.926247][ T3480] ? do_symlinkat+0x26c/0x930 [ 99.930960][ T3480] ? __x64_sys_symlink+0xe0/0x130 [ 99.936012][ T3480] ? do_syscall_64+0x3d/0xb0 [ 99.940655][ T3480] ? entry_SYSCALL_64_after_hwframe+0x44/0xae [ 99.946770][ T3480] ? kmsan_get_metadata+0x33/0x220 [ 99.951925][ T3480] ? kmsan_get_shadow_origin_ptr+0x85/0xf0 [ 99.957791][ T3480] ? kmsan_get_metadata+0x33/0x220 [ 99.962963][ T3480] ? kmsan_get_metadata+0x33/0x220 [ 99.968106][ T3480] ? kmsan_get_metadata+0x33/0x220 [ 99.973296][ T3480] ? kmsan_get_shadow_origin_ptr+0x85/0xf0 [ 99.979139][ T3480] ? zero_user_segments+0x554/0x870 [ 99.984375][ T3480] ? kmsan_get_metadata+0x33/0x220 [ 99.989640][ T3480] ? kmsan_internal_memmove_metadata+0x96/0x350 [ 99.995945][ T3480] ? kmsan_get_metadata+0x33/0x220 [ 100.001136][ T3480] ? kmsan_get_shadow_origin_ptr+0x9a/0xf0 [ 100.006998][ T3480] __msan_warning+0x92/0x110 [ 100.011623][ T3480] __page_symlink+0x2c2/0x350 [ 100.016358][ T3480] page_symlink+0x70/0x90 [ 100.020821][ T3480] ramfs_symlink+0x32c/0x650 [ 100.025475][ T3480] ? ramfs_create+0x200/0x200 [ 100.030208][ T3480] vfs_symlink+0x41c/0x610 [ 100.034690][ T3480] do_symlinkat+0x26c/0x930 [ 100.039248][ T3480] __x64_sys_symlink+0xe0/0x130 [ 100.044130][ T3480] do_syscall_64+0x3d/0xb0 [ 100.048594][ T3480] ? asm_exc_page_fault+0x8/0x30 [ 100.053575][ T3480] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 100.059491][ T3480] RIP: 0033:0x7fcb75be6d49 [ 100.063916][ T3480] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 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 c0 ff ff ff f7 d8 64 89 01 48 [ 100.083570][ T3480] RSP: 002b:00007fff93e11cb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000058 [ 100.092101][ T3480] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007fcb75be6d49 [ 100.100115][ T3480] RDX: 00007fcb75be6d49 RSI: 00000000200000c0 RDI: 0000000020000140 [ 100.108120][ T3480] RBP: 0000000000000000 R08: 00007fff93e11e58 R09: 00007fff93e11e58 [ 100.116128][ T3480] R10: 00007fff93e11e58 R11: 0000000000000246 R12: 00007fcb75baa5d0 [ 100.124143][ T3480] R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 [ 100.132167][ T3480] [ 100.135411][ T3480] Kernel Offset: disabled [ 100.139751][ T3480] Rebooting in 86400 seconds..