./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor291134457 <...> Warning: Permanently added '10.128.0.187' (ED25519) to the list of known hosts. execve("./syz-executor291134457", ["./syz-executor291134457"], 0x7fff0de0c550 /* 10 vars */) = 0 brk(NULL) = 0x55555afac000 brk(0x55555afacd00) = 0x55555afacd00 arch_prctl(ARCH_SET_FS, 0x55555afac380) = 0 set_tid_address(0x55555afac650) = 5862 set_robust_list(0x55555afac660, 24) = 0 rseq(0x55555afacca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor291134457", 4096) = 27 getrandom("\x75\xbd\xa4\x9e\x68\x48\x9a\x50", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x55555afacd00 brk(0x55555afcdd00) = 0x55555afcdd00 brk(0x55555afce000) = 0x55555afce000 mprotect(0x7f1251116000, 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, child_tidptr=0x55555afac650) = 5863 ./strace-static-x86_64: Process 5863 attached [pid 5863] set_robust_list(0x55555afac660, 24) = 0 [pid 5863] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5863] setpgid(0, 0) = 0 [pid 5863] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5863] write(3, "1000", 4) = 4 [pid 5863] close(3) = 0 [pid 5863] write(1, "executing program\n", 18executing program ) = 18 [pid 5863] creat("./file0", 000) = 3 [pid 5863] pipe2([4, 5], 0) = 0 [pid 5863] 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 5863] dup(5) = 6 [pid 5863] 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 5863] 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 5863] mount(NULL, "./file0", "9p", MS_SYNCHRONOUS|MS_REC, "trans=fd,rfdno=0x0000000000000004,wfdno=0x0000000000000006,cache=mmap,k") = 0 [pid 5863] chmod("./file0", 000) = 0 [pid 5863] open("./file0", O_WRONLY) = 7 [pid 5863] 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 5862] kill(-5863, SIGKILL) = 0 [pid 5862] kill(5863, SIGKILL) = 0 [pid 5862] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 5862] newfstatat(3, "", {st_mode=S_IFDIR|0755, st_size=0, ...}, AT_EMPTY_PATH) = 0 [pid 5862] getdents64(3, 0x55555afad6f0 /* 2 entries */, 32768) = 48 [pid 5862] getdents64(3, 0x55555afad6f0 /* 0 entries */, 32768) = 0 [pid 5862] close(3) = 0 [ 286.618069][ T31] INFO: task syz-executor291:5863 blocked for more than 143 seconds. [ 286.626214][ T31] Not tainted 6.16.0-syzkaller #0 [ 286.631984][ T31] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 286.640769][ T31] task:syz-executor291 state:D stack:25448 pid:5863 tgid:5863 ppid:5862 task_flags:0x400140 flags:0x00004006 [ 286.652899][ T31] Call Trace: [ 286.656213][ T31] [ 286.659311][ T31] __schedule+0x16aa/0x4c90 [ 286.663884][ T31] ? schedule+0x165/0x360 [ 286.668304][ T31] ? __pfx___schedule+0x10/0x10 [ 286.673206][ T31] ? schedule+0x91/0x360 [ 286.677461][ T31] schedule+0x165/0x360 [ 286.681701][ T31] io_schedule+0x81/0xe0 [ 286.685970][ T31] folio_wait_bit_common+0x6b0/0xb90 [ 286.691357][ T31] ? __pfx_folio_wait_bit_common+0x10/0x10 [ 286.697195][ T31] ? __pfx_wake_page_function+0x10/0x10 [ 286.702808][ T31] ? __pfx_filemap_get_folios_tag+0x10/0x10 [ 286.708896][ T31] ? __lock_acquire+0xab9/0xd20 [ 286.713759][ T31] ? rcu_is_watching+0x15/0xb0 [ 286.718596][ T31] folio_wait_writeback+0xb0/0x100 [ 286.723737][ T31] __filemap_fdatawait_range+0x147/0x230 [ 286.729435][ T31] ? __pfx___filemap_fdatawait_range+0x10/0x10 [ 286.735633][ T31] ? wbc_detach_inode+0x137/0x750 [ 286.740736][ T31] file_write_and_wait_range+0x275/0x330 [ 286.746421][ T31] ? __pfx_file_write_and_wait_range+0x10/0x10 [ 286.752693][ T31] v9fs_file_fsync+0xcf/0x1a0 [ 286.757402][ T31] ? __pfx_v9fs_file_fsync+0x10/0x10 [ 286.762752][ T31] ? __up_read+0x280/0x680 [ 286.767203][ T31] ? __pfx___up_read+0x10/0x10 [ 286.772050][ T31] ? netfs_file_write_iter+0x189/0x4a0 [ 286.777606][ T31] netfs_file_write_iter+0x3d8/0x4a0 [ 286.783150][ T31] vfs_write+0x54b/0xa90 [ 286.787436][ T31] ? __pfx_v9fs_file_write_iter+0x10/0x10 [ 286.793236][ T31] ? __pfx_vfs_write+0x10/0x10 [ 286.798085][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 286.803381][ T31] ? _raw_spin_unlock_irq+0x2e/0x50 [ 286.808641][ T31] ksys_write+0x145/0x250 [ 286.813044][ T31] ? __pfx_ksys_write+0x10/0x10 [ 286.817982][ T31] ? rcu_is_watching+0x15/0xb0 [ 286.822827][ T31] do_syscall_64+0xfa/0x3b0 [ 286.827358][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 286.832676][ T31] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 286.838830][ T31] ? clear_bhb_loop+0x60/0xb0 [ 286.843616][ T31] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 286.849567][ T31] RIP: 0033:0x7f12510a2ef9 [ 286.854103][ T31] RSP: 002b:00007fffec1fd418 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 286.862687][ T31] RAX: ffffffffffffffda RBX: 0000200000000140 RCX: 00007f12510a2ef9 [ 286.870902][ T31] RDX: 0000000000007fec RSI: 0000200000000300 RDI: 0000000000000007 [ 286.879090][ T31] RBP: 0030656c69662f2e R08: 0000000000000006 R09: 0000000000000006 [ 286.887123][ T31] R10: 0000000000000006 R11: 0000000000000246 R12: 0000200000000180 [ 286.895190][ T31] R13: 00007f12510ec04e R14: 0000000000000001 R15: 0000000000000001 [ 286.903381][ T31] [ 286.906512][ T31] [ 286.906512][ T31] Showing all locks held in the system: [ 286.914296][ T31] 1 lock held by khungtaskd/31: [ 286.919231][ T31] #0: ffffffff8e13f0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 [ 286.929178][ T31] 2 locks held by kworker/u8:4/59: [ 286.934388][ T31] #0: ffff88801a489148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 [ 286.946181][ T31] #1: ffffc9000210fbc0 ((work_completion)(&rreq->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 [ 286.958162][ T31] 2 locks held by getty/5597: [ 286.962943][ T31] #0: ffff8880359f20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 [ 286.972940][ T31] #1: ffffc9000333b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 [ 286.983217][ T31] 1 lock held by syz-executor291/5863: [ 286.988711][ T31] #0: ffff8880304d8428 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x211/0xa90 [ 286.997657][ T31] [ 287.000123][ T31] ============================================= [ 287.000123][ T31] [ 287.008574][ T31] NMI backtrace for cpu 1 [ 287.008585][ T31] CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-syzkaller #0 PREEMPT(full) [ 287.008599][ T31] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 [ 287.008606][ T31] Call Trace: [ 287.008611][ T31] [ 287.008616][ T31] dump_stack_lvl+0x189/0x250 [ 287.008632][ T31] ? __wake_up_klogd+0xd9/0x110 [ 287.008650][ T31] ? __pfx_dump_stack_lvl+0x10/0x10 [ 287.008663][ T31] ? __pfx__printk+0x10/0x10 [ 287.008684][ T31] nmi_cpu_backtrace+0x39e/0x3d0 [ 287.008703][ T31] ? __pfx_nmi_cpu_backtrace+0x10/0x10 [ 287.008718][ T31] ? _printk+0xcf/0x120 [ 287.008735][ T31] ? __pfx__printk+0x10/0x10 [ 287.008750][ T31] ? debug_show_all_locks+0x2e/0x180 [ 287.008762][ T31] ? __pfx_nmi_raise_cpu_backtrace+0x10/0x10 [ 287.008781][ T31] nmi_trigger_cpumask_backtrace+0x17a/0x300 [ 287.008803][ T31] watchdog+0xfee/0x1030 [ 287.008821][ T31] ? watchdog+0x1de/0x1030 [ 287.008842][ T31] kthread+0x70e/0x8a0 [ 287.008858][ T31] ? __pfx_watchdog+0x10/0x10 [ 287.008876][ T31] ? __pfx_kthread+0x10/0x10 [ 287.008892][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 287.008904][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 287.008915][ T31] ? __pfx_kthread+0x10/0x10 [ 287.008930][ T31] ret_from_fork+0x3fc/0x770 [ 287.008943][ T31] ? __pfx_ret_from_fork+0x10/0x10 [ 287.008958][ T31] ? __switch_to_asm+0x39/0x70 [ 287.008971][ T31] ? __switch_to_asm+0x33/0x70 [ 287.008984][ T31] ? __pfx_kthread+0x10/0x10 [ 287.008999][ T31] ret_from_fork_asm+0x1a/0x30 [ 287.009021][ T31] [ 287.009026][ T31] Sending NMI from CPU 1 to CPUs 0: [ 287.169637][ C0] NMI backtrace for cpu 0 [ 287.169656][ C0] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.16.0-syzkaller #0 PREEMPT(full) [ 287.169673][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 [ 287.169683][ C0] RIP: 0010:pv_native_safe_halt+0x13/0x20 [ 287.169704][ 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 [ 287.169717][ C0] RSP: 0018:ffffffff8de07d80 EFLAGS: 000002c2 [ 287.169733][ C0] RAX: f67cd28cd5a47e00 RBX: ffffffff81976918 RCX: f67cd28cd5a47e00 [ 287.169746][ C0] RDX: 0000000000000001 RSI: ffffffff8d982fba RDI: ffffffff8be1ba40 [ 287.169756][ C0] RBP: ffffffff8de07ea8 R08: ffff8880b8632f5b R09: 1ffff110170c65eb [ 287.169776][ C0] R10: dffffc0000000000 R11: ffffed10170c65ec R12: ffffffff8fa0b3f0 [ 287.169787][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1bd2a50 [ 287.169798][ C0] FS: 0000000000000000(0000) GS:ffff888125c57000(0000) knlGS:0000000000000000 [ 287.169810][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 287.169821][ C0] CR2: 000056510bef5660 CR3: 000000000df38000 CR4: 00000000003526f0 [ 287.169837][ C0] Call Trace: [ 287.169846][ C0] [ 287.169852][ C0] default_idle+0x13/0x20 [ 287.169871][ C0] default_idle_call+0x74/0xb0 [ 287.169891][ C0] do_idle+0x1e8/0x510 [ 287.169913][ C0] ? __pfx_do_idle+0x10/0x10 [ 287.169928][ C0] ? lockdep_hardirqs_on+0x9c/0x150 [ 287.169945][ C0] ? _raw_spin_unlock_irqrestore+0xad/0x110 [ 287.169968][ C0] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 287.169993][ C0] cpu_startup_entry+0x44/0x60 [ 287.170010][ C0] rest_init+0x2de/0x300 [ 287.170030][ C0] ? __pfx_x86_late_time_init+0x10/0x10 [ 287.170069][ C0] start_kernel+0x47d/0x500 [ 287.170089][ C0] x86_64_start_reservations+0x24/0x30 [ 287.170110][ C0] x86_64_start_kernel+0x143/0x1c0 [ 287.170131][ C0] common_startup_64+0x13e/0x147 [ 287.170158][ C0] [ 287.170621][ T31] Kernel panic - not syncing: hung_task: blocked tasks [ 287.170637][ T31] CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-syzkaller #0 PREEMPT(full) [ 287.170657][ T31] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 [ 287.170668][ T31] Call Trace: [ 287.170677][ T31] [ 287.170685][ T31] dump_stack_lvl+0x99/0x250 [ 287.170709][ T31] ? __asan_memcpy+0x40/0x70 [ 287.170735][ T31] ? __pfx_dump_stack_lvl+0x10/0x10 [ 287.170754][ T31] ? __pfx__printk+0x10/0x10 [ 287.170789][ T31] panic+0x2db/0x790 [ 287.170814][ T31] ? __pfx_panic+0x10/0x10 [ 287.170833][ T31] ? nmi_backtrace_stall_check+0x433/0x440 [ 287.170859][ T31] ? irq_work_queue+0xc3/0x140 [ 287.170894][ T31] watchdog+0x102d/0x1030 [ 287.170922][ T31] ? watchdog+0x1de/0x1030 [ 287.170954][ T31] kthread+0x70e/0x8a0 [ 287.170982][ T31] ? __pfx_watchdog+0x10/0x10 [ 287.171006][ T31] ? __pfx_kthread+0x10/0x10 [ 287.171038][ T31] ? _raw_spin_unlock_irq+0x23/0x50 [ 287.171055][ T31] ? lockdep_hardirqs_on+0x9c/0x150 [ 287.171072][ T31] ? __pfx_kthread+0x10/0x10 [ 287.171096][ T31] ret_from_fork+0x3fc/0x770 [ 287.171118][ T31] ? __pfx_ret_from_fork+0x10/0x10 [ 287.171141][ T31] ? __switch_to_asm+0x39/0x70 [ 287.171162][ T31] ? __switch_to_asm+0x33/0x70 [ 287.171182][ T31] ? __pfx_kthread+0x10/0x10 [ 287.171206][ T31] ret_from_fork_asm+0x1a/0x30 [ 287.171243][ T31] [ 287.509005][ T31] Kernel Offset: disabled [ 287.513338][ T31] Rebooting in 86400 seconds..