./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2242405754 <...> Warning: Permanently added '10.128.0.191' (ED25519) to the list of known hosts. execve("./syz-executor2242405754", ["./syz-executor2242405754"], 0x7ffd649f5aa0 /* 10 vars */) = 0 brk(NULL) = 0x555575a1b000 brk(0x555575a1bd00) = 0x555575a1bd00 arch_prctl(ARCH_SET_FS, 0x555575a1b380) = 0 set_tid_address(0x555575a1b650) = 5848 set_robust_list(0x555575a1b660, 24) = 0 rseq(0x555575a1bca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor2242405754", 4096) = 28 getrandom("\x43\x03\x3e\x38\xf2\x9f\xc6\xba", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555575a1bd00 brk(0x555575a3cd00) = 0x555575a3cd00 brk(0x555575a3d000) = 0x555575a3d000 mprotect(0x7fb29050f000, 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 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5849 attached , child_tidptr=0x555575a1b650) = 5849 [pid 5849] set_robust_list(0x555575a1b660, 24) = 0 [pid 5849] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5849] setpgid(0, 0) = 0 [pid 5849] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5849] write(3, "1000", 4) = 4 [pid 5849] close(3) = 0 [pid 5849] write(1, "executing program\n", 18executing program ) = 18 [pid 5849] creat("./file0", 000) = 3 [pid 5849] pipe2([4, 5], 0) = 0 [pid 5849] write(5, "\x15\x00\x00\x00\x65\xff\xff\x04\x80\x00\x00\x08\x00\x39\x50\x32\x30\x30\x30\x00\x00", 21) = 21 [pid 5849] dup(5) = 6 [pid 5849] write(6, "\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 24) = 24 [pid 5849] write(6, "\x4c\x01\x00\x00\x05\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 311) = 311 [pid 5849] mount(NULL, "./file0", "9p", MS_SYNCHRONOUS|MS_REC, "trans=fd,rfdno=0x0000000000000004,wfdno=0x0000000000000006,cache=mmap,k") = 0 [pid 5849] chmod("./file0", 000) = 0 [pid 5849] open("./file0", O_WRONLY) = 7 [pid 5849] write(7, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 32748 [pid 5848] kill(-5849, SIGKILL) = 0 [pid 5848] kill(5849, SIGKILL) = 0 [pid 5848] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5848] newfstatat(3, "", {st_mode=S_IFDIR|0755, st_size=0, ...}, AT_EMPTY_PATH) = 0 [pid 5848] getdents64(3, 0x555575a1c6f0 /* 2 entries */, 32768) = 48 [pid 5848] getdents64(3, 0x555575a1c6f0 /* 0 entries */, 32768) = 0 [pid 5848] close(3) = 0 [ 286.428727][ T31] INFO: task syz-executor224:5849 blocked for more than 143 seconds. [ 286.436894][ T31] Not tainted 6.16.0-syzkaller #0 [ 286.442534][ T31] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 286.451362][ T31] task:syz-executor224 state:D stack:22952 pid:5849 tgid:5849 ppid:5848 task_flags:0x400140 flags:0x00004006 [ 286.463424][ T31] Call Trace: [ 286.466719][ T31] [ 286.469710][ T31] __schedule+0x16aa/0x4c90 [ 286.474277][ T31] ? schedule+0x165/0x360 [ 286.478647][ T31] ? __pfx___schedule+0x10/0x10 [ 286.483526][ T31] ? schedule+0x91/0x360 [ 286.487822][ T31] schedule+0x165/0x360 [ 286.491999][ T31] io_schedule+0x81/0xe0 [ 286.496241][ T31] folio_wait_bit_common+0x6b0/0xb90 [ 286.501615][ T31] ? __pfx_folio_wait_bit_common+0x10/0x10 [ 286.507489][ T31] ? __pfx_wake_page_function+0x10/0x10 [ 286.513058][ T31] ? __pfx_filemap_get_folios_tag+0x10/0x10 [ 286.519008][ T31] ? __lock_acquire+0xab9/0xd20 [ 286.523920][ T31] ? rcu_is_watching+0x15/0xb0 [ 286.528730][ T31] folio_wait_writeback+0xb0/0x100 [ 286.533865][ T31] __filemap_fdatawait_range+0x147/0x230 [ 286.539573][ T31] ? __pfx___filemap_fdatawait_range+0x10/0x10 [ 286.545777][ T31] ? wbc_detach_inode+0x137/0x750 [ 286.550853][ T31] file_write_and_wait_range+0x275/0x330 [ 286.556522][ T31] ? __pfx_file_write_and_wait_range+0x10/0x10 [ 286.562845][ T31] v9fs_file_fsync+0xcf/0x1a0 [ 286.567602][ T31] ? __pfx_v9fs_file_fsync+0x10/0x10 [ 286.572912][ T31] ? __up_read+0x280/0x680 [ 286.577376][ T31] ? __pfx___up_read+0x10/0x10 [ 286.582192][ T31] ? netfs_file_write_iter+0x189/0x4a0 [ 286.587738][ T31] netfs_file_write_iter+0x3d8/0x4a0 [ 286.593060][ T31] vfs_write+0x54b/0xa90 [ 286.597361][ T31] ? __pfx_v9fs_file_write_iter+0x10/0x10 [ 286.603118][ T31] ? __pfx_vfs_write+0x10/0x10 [ 286.607924][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 286.613144][ T31] ? _raw_spin_unlock_irq+0x2e/0x50 [ 286.618451][ T31] ksys_write+0x145/0x250 [ 286.622805][ T31] ? __pfx_ksys_write+0x10/0x10 [ 286.627700][ T31] ? rcu_is_watching+0x15/0xb0 [ 286.632499][ T31] do_syscall_64+0xfa/0x3b0 [ 286.637007][ T31] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 286.643128][ T31] ? asm_common_interrupt+0x26/0x40 [ 286.648393][ T31] ? clear_bhb_loop+0x60/0xb0 [ 286.653079][ T31] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 286.659011][ T31] RIP: 0033:0x7fb29049bef9 [ 286.663487][ T31] RSP: 002b:00007ffeb3361588 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 286.671959][ T31] RAX: ffffffffffffffda RBX: 0000200000000140 RCX: 00007fb29049bef9 [ 286.679972][ T31] RDX: 0000000000007fec RSI: 0000200000000300 RDI: 0000000000000007 [ 286.687993][ T31] RBP: 0030656c69662f2e R08: 0000000000000006 R09: 0000000000000006 [ 286.695982][ T31] R10: 0000000000000006 R11: 0000000000000246 R12: 0000200000000180 [ 286.704010][ T31] R13: 00007fb2904e504e R14: 0000000000000001 R15: 0000000000000001 [ 286.712070][ T31] [ 286.715123][ T31] [ 286.715123][ T31] Showing all locks held in the system: [ 286.722885][ T31] 2 locks held by kworker/u8:0/12: [ 286.728063][ T31] 1 lock held by khungtaskd/31: [ 286.732948][ T31] #0: ffffffff8e13f0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 [ 286.742877][ T31] 2 locks held by kworker/u8:6/1337: [ 286.748214][ T31] #0: ffff88801a489148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 [ 286.759952][ T31] #1: ffffc9000451fbc0 ((work_completion)(&rreq->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 [ 286.771792][ T31] 2 locks held by getty/5596: [ 286.776462][ T31] #0: ffff88803095f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 [ 286.786260][ T31] #1: ffffc900036cb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 [ 286.796428][ T31] 1 lock held by syz-executor224/5849: [ 286.801915][ T31] #0: ffff88807f8cc428 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x211/0xa90 [ 286.811049][ T31] [ 286.813372][ T31] ============================================= [ 286.813372][ T31] [ 286.821828][ T31] NMI backtrace for cpu 1 [ 286.821850][ T31] CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-syzkaller #0 PREEMPT(full) [ 286.821872][ T31] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 [ 286.821883][ T31] Call Trace: [ 286.821890][ T31] [ 286.821898][ T31] dump_stack_lvl+0x189/0x250 [ 286.821920][ T31] ? __wake_up_klogd+0xd9/0x110 [ 286.821949][ T31] ? __pfx_dump_stack_lvl+0x10/0x10 [ 286.821970][ T31] ? __pfx__printk+0x10/0x10 [ 286.822007][ T31] nmi_cpu_backtrace+0x39e/0x3d0 [ 286.822040][ T31] ? __pfx_nmi_cpu_backtrace+0x10/0x10 [ 286.822067][ T31] ? _printk+0xcf/0x120 [ 286.822096][ T31] ? __pfx__printk+0x10/0x10 [ 286.822122][ T31] ? debug_show_all_locks+0x2e/0x180 [ 286.822142][ T31] ? __pfx_nmi_raise_cpu_backtrace+0x10/0x10 [ 286.822175][ T31] nmi_trigger_cpumask_backtrace+0x17a/0x300 [ 286.822208][ T31] watchdog+0xfee/0x1030 [ 286.822239][ T31] ? watchdog+0x1de/0x1030 [ 286.822275][ T31] kthread+0x70e/0x8a0 [ 286.822305][ T31] ? __pfx_watchdog+0x10/0x10 [ 286.822333][ T31] ? __pfx_kthread+0x10/0x10 [ 286.822366][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 286.822385][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 286.822405][ T31] ? __pfx_kthread+0x10/0x10 [ 286.822432][ T31] ret_from_fork+0x3fc/0x770 [ 286.822455][ T31] ? __pfx_ret_from_fork+0x10/0x10 [ 286.822480][ T31] ? __switch_to_asm+0x39/0x70 [ 286.822504][ T31] ? __switch_to_asm+0x33/0x70 [ 286.822527][ T31] ? __pfx_kthread+0x10/0x10 [ 286.822553][ T31] ret_from_fork_asm+0x1a/0x30 [ 286.822593][ T31] [ 286.822600][ T31] Sending NMI from CPU 1 to CPUs 0: [ 286.982747][ C0] NMI backtrace for cpu 0 [ 286.982764][ C0] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.16.0-syzkaller #0 PREEMPT(full) [ 286.982794][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 [ 286.982804][ C0] RIP: 0010:pv_native_safe_halt+0x13/0x20 [ 286.982825][ C0] Code: 53 de 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d d3 ad 21 00 f3 0f 1e fa fb f4 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 [ 286.982839][ C0] RSP: 0018:ffffffff8de07d80 EFLAGS: 000002c2 [ 286.982854][ C0] RAX: eefad1cde067ed00 RBX: ffffffff81976918 RCX: eefad1cde067ed00 [ 286.982867][ C0] RDX: 0000000000000001 RSI: ffffffff8d982fba RDI: ffffffff8be1ba40 [ 286.982878][ C0] RBP: ffffffff8de07ea8 R08: ffff8880b8632f5b R09: 1ffff110170c65eb [ 286.982891][ C0] R10: dffffc0000000000 R11: ffffed10170c65ec R12: ffffffff8fa0b3f0 [ 286.982903][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1bd2a50 [ 286.982913][ C0] FS: 0000000000000000(0000) GS:ffff888125c57000(0000) knlGS:0000000000000000 [ 286.982927][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 286.982938][ C0] CR2: 000055943a295660 CR3: 000000000df38000 CR4: 00000000003526f0 [ 286.982952][ C0] Call Trace: [ 286.982959][ C0] [ 286.982965][ C0] default_idle+0x13/0x20 [ 286.982985][ C0] default_idle_call+0x74/0xb0 [ 286.983005][ C0] do_idle+0x1e8/0x510 [ 286.983026][ C0] ? __pfx_do_idle+0x10/0x10 [ 286.983043][ C0] ? lockdep_hardirqs_on+0x9c/0x150 [ 286.983059][ C0] ? _raw_spin_unlock_irqrestore+0xad/0x110 [ 286.983086][ C0] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 286.983116][ C0] cpu_startup_entry+0x44/0x60 [ 286.983134][ C0] rest_init+0x2de/0x300 [ 286.983155][ C0] ? __pfx_x86_late_time_init+0x10/0x10 [ 286.983190][ C0] start_kernel+0x47d/0x500 [ 286.983211][ C0] x86_64_start_reservations+0x24/0x30 [ 286.983235][ C0] x86_64_start_kernel+0x143/0x1c0 [ 286.983258][ C0] common_startup_64+0x13e/0x147 [ 286.983287][ C0] [ 286.983734][ T31] Kernel panic - not syncing: hung_task: blocked tasks [ 286.983758][ T31] CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-syzkaller #0 PREEMPT(full) [ 286.983784][ T31] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 [ 286.983798][ T31] Call Trace: [ 286.983807][ T31] [ 286.983817][ T31] dump_stack_lvl+0x99/0x250 [ 286.983845][ T31] ? __asan_memcpy+0x40/0x70 [ 286.983878][ T31] ? __pfx_dump_stack_lvl+0x10/0x10 [ 286.983904][ T31] ? __pfx__printk+0x10/0x10 [ 286.983946][ T31] panic+0x2db/0x790 [ 286.983975][ T31] ? __pfx_panic+0x10/0x10 [ 286.983998][ T31] ? nmi_backtrace_stall_check+0x433/0x440 [ 286.984030][ T31] ? irq_work_queue+0xc3/0x140 [ 286.984073][ T31] watchdog+0x102d/0x1030 [ 286.984114][ T31] ? watchdog+0x1de/0x1030 [ 286.984156][ T31] kthread+0x70e/0x8a0 [ 286.984189][ T31] ? __pfx_watchdog+0x10/0x10 [ 286.984220][ T31] ? __pfx_kthread+0x10/0x10 [ 286.984252][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 286.984274][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 286.984294][ T31] ? __pfx_kthread+0x10/0x10 [ 286.984325][ T31] ret_from_fork+0x3fc/0x770 [ 286.984351][ T31] ? __pfx_ret_from_fork+0x10/0x10 [ 286.984379][ T31] ? __switch_to_asm+0x39/0x70 [ 286.984405][ T31] ? __switch_to_asm+0x33/0x70 [ 286.984431][ T31] ? __pfx_kthread+0x10/0x10 [ 286.984462][ T31] ret_from_fork_asm+0x1a/0x30 [ 286.984505][ T31] [ 287.320386][ T31] Kernel Offset: disabled [ 287.324724][ T31] Rebooting in 86400 seconds..