./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2008062880 <...> Warning: Permanently added '10.128.1.44' (ECDSA) to the list of known hosts. execve("./syz-executor2008062880", ["./syz-executor2008062880"], 0x7ffcd24c2f50 /* 10 vars */) = 0 brk(NULL) = 0x555557028000 brk(0x555557028c40) = 0x555557028c40 arch_prctl(ARCH_SET_FS, 0x555557028300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor2008062880", 4096) = 28 brk(0x555557049c40) = 0x555557049c40 brk(0x55555704a000) = 0x55555704a000 mprotect(0x7f5693d62000, 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./strace-static-x86_64: Process 3607 attached , child_tidptr=0x5555570285d0) = 3607 [pid 3607] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 3607] setpgid(0, 0) = 0 [pid 3607] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 3607] write(3, "1000", 4) = 4 [pid 3607] close(3) = 0 [pid 3607] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3 [pid 3607] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4 [pid 3607] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0 [pid 3607] ioctl(4, NBD_SET_SOCK, 5) = 0 [pid 3607] ioctl(3, NBD_SET_SIZE_BLOCKS, 17) = 0 syzkaller login: [ 42.750626][ T3607] nbd0: detected capacity change from 0 to 34 [pid 3607] ioctl(4, NBD_DO_IT [pid 3606] kill(-3607, SIGKILL) = 0 [pid 3606] kill(3607, SIGKILL) = 0 [pid 3607] <... ioctl resumed>) = ? [ 47.716948][ T3607] block nbd0: shutting down sockets [pid 3606] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 3606] fstat(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 [pid 3606] getdents64(3, 0x555557029620 /* 2 entries */, 32768) = 48 [pid 3606] getdents64(3, 0x555557029620 /* 0 entries */, 32768) = 0 [pid 3606] close(3) = 0 [ 73.107389][ T52] block nbd0: Possible stuck request ffff88801f4d0000: control (read@0,4096B). Runtime 30 seconds [ 76.309045][ T14] cfg80211: failed to load regulatory.db [ 103.187334][ T52] block nbd0: Possible stuck request ffff88801f4d0000: control (read@0,4096B). Runtime 60 seconds [ 104.912455][ T2972] udevd[2972]: worker [3609] /devices/virtual/block/nbd0 is taking a long time [ 133.267367][ T52] block nbd0: Possible stuck request ffff88801f4d0000: control (read@0,4096B). Runtime 90 seconds [ 163.347418][ T52] block nbd0: Possible stuck request ffff88801f4d0000: control (read@0,4096B). Runtime 120 seconds [ 193.427376][ T52] block nbd0: Possible stuck request ffff88801f4d0000: control (read@0,4096B). Runtime 150 seconds [ 223.507385][ T52] block nbd0: Possible stuck request ffff88801f4d0000: control (read@0,4096B). Runtime 180 seconds [ 225.447564][ T2972] udevd[2972]: worker [3609] /devices/virtual/block/nbd0 timeout; kill it [ 225.456273][ T2972] udevd[2972]: seq 7461 '/devices/virtual/block/nbd0' killed [ 253.587432][ T52] block nbd0: Possible stuck request ffff88801f4d0000: control (read@0,4096B). Runtime 210 seconds [ 283.667377][ T52] block nbd0: Possible stuck request ffff88801f4d0000: control (read@0,4096B). Runtime 240 seconds [ 286.227378][ T28] INFO: task syz-executor200:3607 blocked for more than 143 seconds. [ 286.235592][ T28] Not tainted 6.0.0-rc5-syzkaller-00025-g3245cb65fd91 #0 [ 286.243757][ T28] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 286.252625][ T28] task:syz-executor200 state:D stack:25984 pid: 3607 ppid: 3606 flags:0x00004006 [ 286.262043][ T28] Call Trace: [ 286.265333][ T28] [ 286.268437][ T28] __schedule+0x957/0xe20 [ 286.272872][ T28] ? release_firmware_map_entry+0x184/0x184 [ 286.278970][ T28] ? __mutex_trylock_common+0x8e/0x2f0 [ 286.284553][ T28] ? do_raw_spin_unlock+0x134/0x8a0 [ 286.289961][ T28] schedule+0xcb/0x190 [ 286.294045][ T28] schedule_preempt_disabled+0xf/0x20 [ 286.299763][ T28] __mutex_lock_common+0xecf/0x26c0 [ 286.305032][ T28] ? blkdev_put+0x100/0x730 [ 286.309802][ T28] ? mutex_lock_io_nested+0x60/0x60 [ 286.315016][ T28] ? __fsnotify_parent+0x4fd/0x710 [ 286.320386][ T28] ? blkdev_open+0x2e0/0x2e0 [ 286.324989][ T28] mutex_lock_nested+0x17/0x20 [ 286.329936][ T28] blkdev_put+0x100/0x730 [ 286.334283][ T28] ? blkdev_open+0x2e0/0x2e0 [ 286.339022][ T28] blkdev_close+0x55/0x80 [ 286.343383][ T28] __fput+0x3b9/0x820 [ 286.347744][ T28] task_work_run+0x146/0x1c0 [ 286.352411][ T28] do_exit+0x55e/0x20a0 [ 286.356602][ T28] ? mm_update_next_owner+0x6d0/0x6d0 [ 286.362060][ T28] ? lockdep_hardirqs_on_prepare+0x448/0x7b0 [ 286.368169][ T28] ? print_irqtrace_events+0x220/0x220 [ 286.373653][ T28] ? _raw_spin_lock_irq+0xdb/0x110 [ 286.378976][ T28] do_group_exit+0x23b/0x2f0 [ 286.383576][ T28] ? _raw_spin_unlock_irq+0x1f/0x40 [ 286.388924][ T28] ? lockdep_hardirqs_on+0x95/0x140 [ 286.394168][ T28] get_signal+0x172f/0x1780 [ 286.398906][ T28] ? ptrace_notify+0x340/0x340 [ 286.403683][ T28] ? do_raw_spin_unlock+0x134/0x8a0 [ 286.409031][ T28] arch_do_signal_or_restart+0x8d/0x750 [ 286.414608][ T28] ? _raw_spin_unlock_irq+0x2a/0x40 [ 286.419981][ T28] ? ptrace_notify+0x245/0x340 [ 286.424761][ T28] ? get_sigframe_size+0x10/0x10 [ 286.429854][ T28] ? vtime_user_exit+0x2b2/0x3e0 [ 286.434868][ T28] ? exit_to_user_mode_loop+0x42/0x160 [ 286.440528][ T28] exit_to_user_mode_loop+0x74/0x160 [ 286.445820][ T28] exit_to_user_mode_prepare+0xad/0x110 [ 286.451516][ T28] syscall_exit_to_user_mode+0x2e/0x60 [ 286.457073][ T28] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 286.463204][ T28] RIP: 0033:0x7f5693cf56a9 [ 286.467847][ T28] RSP: 002b:00007ffd44ef0598 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 286.476266][ T28] RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 00007f5693cf56a9 [ 286.484569][ T28] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004 [ 286.492734][ T28] RBP: 0000000000000000 R08: 00007ffd44ef0738 R09: 00007ffd44ef0738 [ 286.500828][ T28] R10: 00007ffd44ef0738 R11: 0000000000000246 R12: 00007f5693cb4730 [ 286.509134][ T28] R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 [ 286.517121][ T28] [ 286.520319][ T28] [ 286.520319][ T28] Showing all locks held in the system: [ 286.528182][ T28] 1 lock held by rcu_tasks_kthre/12: [ 286.533498][ T28] #0: ffffffff8cd20a70 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 [ 286.544208][ T28] 1 lock held by rcu_tasks_trace/13: [ 286.549614][ T28] #0: ffffffff8cd21270 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 [ 286.560815][ T28] 1 lock held by khungtaskd/28: [ 286.565667][ T28] #0: ffffffff8cd208a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 [ 286.575216][ T28] 2 locks held by syslogd/2954: [ 286.580137][ T28] #0: ffff8880b9a39c18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x110 [ 286.590201][ T28] #1: ffff8880b9a27748 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x53a/0x8a0 [ 286.601627][ T28] 2 locks held by getty/3287: [ 286.606300][ T28] #0: ffff88814b0d3098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 [ 286.616457][ T28] #1: ffffc90002d232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6e8/0x1e50 [ 286.626840][ T28] 1 lock held by syz-executor200/3607: [ 286.632515][ T28] #0: ffff88801f43b4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x100/0x730 [ 286.642069][ T28] 1 lock held by udevd/3609: [ 286.646660][ T28] #0: ffff88801f43b4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xfd/0xa40 [ 286.656639][ T28] [ 286.659004][ T28] ============================================= [ 286.659004][ T28] [ 286.667434][ T28] NMI backtrace for cpu 0 [ 286.671760][ T28] CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.0.0-rc5-syzkaller-00025-g3245cb65fd91 #0 [ 286.681546][ T28] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 [ 286.691584][ T28] Call Trace: [ 286.694853][ T28] [ 286.697770][ T28] dump_stack_lvl+0x1e3/0x2cb [ 286.702440][ T28] ? io_alloc_page_table+0x110/0x110 [ 286.707708][ T28] ? panic+0x76b/0x76b [ 286.711813][ T28] ? console_unlock+0x6bd/0x6f0 [ 286.716652][ T28] ? console_trylock_spinning+0x450/0x450 [ 286.722366][ T28] ? nmi_cpu_backtrace+0x248/0x4b0 [ 286.727502][ T28] nmi_cpu_backtrace+0x47c/0x4b0 [ 286.732437][ T28] ? vprintk_emit+0x109/0x1e0 [ 286.737111][ T28] ? nmi_trigger_cpumask_backtrace+0x280/0x280 [ 286.743256][ T28] ? _printk+0xcf/0x10f [ 286.747403][ T28] ? panic+0x76b/0x76b [ 286.751461][ T28] ? __wake_up_klogd+0xcd/0x100 [ 286.756302][ T28] ? panic+0x76b/0x76b [ 286.760372][ T28] ? __rcu_read_unlock+0x8f/0x100 [ 286.765389][ T28] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 286.771521][ T28] nmi_trigger_cpumask_backtrace+0x169/0x280 [ 286.777496][ T28] watchdog+0xcd5/0xd20 [ 286.781712][ T28] kthread+0x266/0x300 [ 286.785771][ T28] ? hungtask_pm_notify+0x50/0x50 [ 286.790805][ T28] ? kthread_blkcg+0xd0/0xd0 [ 286.795390][ T28] ret_from_fork+0x1f/0x30 [ 286.799821][ T28] [ 286.802965][ T28] Sending NMI from CPU 0 to CPUs 1: [ 286.808224][ C1] NMI backtrace for cpu 1 [ 286.808234][ C1] CPU: 1 PID: 11 Comm: kworker/u4:1 Not tainted 6.0.0-rc5-syzkaller-00025-g3245cb65fd91 #0 [ 286.808248][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 [ 286.808257][ C1] Workqueue: events_unbound toggle_allocation_gate [ 286.808315][ C1] RIP: 0010:lock_is_held_type+0xa6/0x190 [ 286.808334][ C1] Code: c9 75 41 83 bd 70 0a 00 00 00 7e 53 4c 89 ed 48 81 c5 78 0a 00 00 31 db 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 83 fb 31 73 24 <48> 89 ef 4c 89 fe e8 ff 01 00 00 85 c0 75 2a 48 ff c3 49 63 85 70 [ 286.808345][ C1] RSP: 0018:ffffc90000107598 EFLAGS: 00000083 [ 286.808356][ C1] RAX: 0000000000000006 RBX: 0000000000000001 RCX: 0000000080000002 [ 286.808365][ C1] RDX: 0000000000000000 RSI: ffffffff8cd20820 RDI: ffff88801224c578 [ 286.808375][ C1] RBP: ffff88801224c5a0 R08: dffffc0000000000 R09: fffffbfff1c4b58e [ 286.808385][ C1] R10: fffffbfff1c4b58e R11: 1ffffffff1c4b58d R12: 0000000000000046 [ 286.808394][ C1] R13: ffff88801224bb00 R14: 00000000ffffffff R15: ffffffff8cd20820 [ 286.808403][ C1] FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 [ 286.808415][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 286.808424][ C1] CR2: 00007ffea99a80e8 CR3: 0000000012308000 CR4: 00000000003506e0 [ 286.808436][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 286.808444][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 286.808452][ C1] Call Trace: [ 286.808456][ C1] [ 286.808463][ C1] rcu_read_lock_sched_held+0x89/0x130 [ 286.808481][ C1] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 286.808498][ C1] ? read_lock_is_recursive+0x10/0x10 [ 286.808514][ C1] trace_tlb_flush+0x7a/0x190 [ 286.808537][ C1] switch_mm_irqs_off+0x59d/0x8f0 [ 286.808553][ C1] ? switch_mm+0x190/0x190 [ 286.808567][ C1] ? __text_poke+0x2f7/0x9d0 [ 286.808607][ C1] ? lockdep_hardirqs_off+0x71/0x100 [ 286.808621][ C1] ? __text_poke+0x9d0/0x9d0 [ 286.808632][ C1] ? kmem_cache_alloc_node+0xdb/0x350 [ 286.808663][ C1] __text_poke+0x5c2/0x9d0 [ 286.808676][ C1] ? kmem_cache_alloc_node+0xdb/0x350 [ 286.808690][ C1] ? __text_poke+0x9d0/0x9d0 [ 286.808703][ C1] ? text_poke+0x90/0x90 [ 286.808716][ C1] ? rcu_read_lock_sched_held+0x89/0x130 [ 286.808730][ C1] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 286.808746][ C1] ? trace_raw_output_contention_end+0xd0/0xd0 [ 286.808766][ C1] ? kmem_cache_alloc_node+0xdb/0x350 [ 286.808780][ C1] text_poke_bp_batch+0x1b7/0x970 [ 286.808796][ C1] ? mutex_lock_io_nested+0x60/0x60 [ 286.808812][ C1] ? text_poke_loc_init+0x510/0x510 [ 286.808825][ C1] ? arch_jump_label_transform_queue+0x7c/0xd0 [ 286.808841][ C1] ? __jump_label_update+0x38e/0x3b0 [ 286.808890][ C1] text_poke_finish+0x16/0x30 [ 286.808902][ C1] arch_jump_label_transform_apply+0x13/0x20 [ 286.808917][ C1] static_key_disable_cpuslocked+0xc8/0x1b0 [ 286.808934][ C1] static_key_disable+0x16/0x20 [ 286.808948][ C1] toggle_allocation_gate+0x3d8/0x470 [ 286.808963][ C1] ? virt_to_slab+0x2c0/0x2c0 [ 286.808979][ C1] ? rcu_read_lock_sched_held+0x89/0x130 [ 286.808993][ C1] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 286.809008][ C1] ? _raw_spin_unlock_irqrestore+0xd9/0x130 [ 286.809029][ C1] process_one_work+0x81c/0xd10 [ 286.809072][ C1] ? worker_detach_from_pool+0x260/0x260 [ 286.809089][ C1] ? _raw_spin_lock_irqsave+0x120/0x120 [ 286.809103][ C1] ? kthread_data+0x4d/0xc0 [ 286.809119][ C1] ? wq_worker_running+0x95/0x190 [ 286.809135][ C1] worker_thread+0xb14/0x1330 [ 286.809166][ C1] kthread+0x266/0x300 [ 286.809179][ C1] ? rcu_lock_release+0x20/0x20 [ 286.809194][ C1] ? kthread_blkcg+0xd0/0xd0 [ 286.809208][ C1] ret_from_fork+0x1f/0x30 [ 286.809228][ C1] [ 286.809233][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.009 msecs [ 286.810269][ T28] Kernel panic - not syncing: hung_task: blocked tasks [ 287.192367][ T28] CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.0.0-rc5-syzkaller-00025-g3245cb65fd91 #0 [ 287.202166][ T28] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 [ 287.212386][ T28] Call Trace: [ 287.215660][ T28] [ 287.218591][ T28] dump_stack_lvl+0x1e3/0x2cb [ 287.223285][ T28] ? io_alloc_page_table+0x110/0x110 [ 287.228580][ T28] ? panic+0x76b/0x76b [ 287.232697][ T28] ? vscnprintf+0x59/0x80 [ 287.237058][ T28] panic+0x316/0x76b [ 287.240976][ T28] ? schedule_preempt_disabled+0x20/0x20 [ 287.246606][ T28] ? nmi_trigger_cpumask_backtrace+0x205/0x280 [ 287.252754][ T28] ? fb_is_primary_device+0xcc/0xcc [ 287.257947][ T28] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 287.264009][ T28] ? nmi_trigger_cpumask_backtrace+0x205/0x280 [ 287.270155][ T28] ? nmi_trigger_cpumask_backtrace+0x265/0x280 [ 287.276322][ T28] watchdog+0xd16/0xd20 [ 287.280483][ T28] kthread+0x266/0x300 [ 287.284545][ T28] ? hungtask_pm_notify+0x50/0x50 [ 287.289561][ T28] ? kthread_blkcg+0xd0/0xd0 [ 287.294147][ T28] ret_from_fork+0x1f/0x30 [ 287.298566][ T28] [ 287.301850][ T28] Kernel Offset: disabled [ 287.306177][ T28] Rebooting in 86400 seconds..