./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor52847800 <...> Warning: Permanently added '10.128.0.164' (ECDSA) to the list of known hosts. execve("./syz-executor52847800", ["./syz-executor52847800"], 0x7ffef86e1a60 /* 10 vars */) = 0 brk(NULL) = 0x555555826000 brk(0x555555826c40) = 0x555555826c40 arch_prctl(ARCH_SET_FS, 0x555555826300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor52847800", 4096) = 26 brk(0x555555847c40) = 0x555555847c40 brk(0x555555848000) = 0x555555848000 mprotect(0x7ff74bcad000, 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 3606 attached , child_tidptr=0x5555558265d0) = 3606 [pid 3606] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 3606] setpgid(0, 0) = 0 [pid 3606] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 3606] write(3, "1000", 4) = 4 [pid 3606] close(3) = 0 [pid 3606] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3 [pid 3606] ioctl(3, NBD_SET_SIZE_BLOCKS, 2159) = 0 [pid 3606] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4 [pid 3606] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0 [pid 3606] ioctl(4, NBD_SET_SOCK, 5) = 0 syzkaller login: [ 42.128931][ T3606] nbd0: detected capacity change from 0 to 4318 [pid 3606] ioctl(4, NBD_DO_IT [pid 3605] kill(-3606, SIGKILL) = 0 [pid 3605] kill(3606, SIGKILL) = 0 [pid 3606] <... ioctl resumed>) = ? [ 47.085398][ T3606] block nbd0: shutting down sockets [pid 3605] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 3605] fstat(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 [pid 3605] getdents64(3, 0x555555827620 /* 2 entries */, 32768) = 48 [pid 3605] getdents64(3, 0x555555827620 /* 0 entries */, 32768) = 0 [pid 3605] close(3) = 0 [ 72.345974][ T754] block nbd0: Possible stuck request ffff88801f508000: control (read@0,4096B). Runtime 30 seconds [ 76.187523][ T141] cfg80211: failed to load regulatory.db [ 102.425913][ T754] block nbd0: Possible stuck request ffff88801f508000: control (read@0,4096B). Runtime 60 seconds [ 104.791831][ T2972] udevd[2972]: worker [3608] /devices/virtual/block/nbd0 is taking a long time [ 132.505912][ T754] block nbd0: Possible stuck request ffff88801f508000: control (read@0,4096B). Runtime 90 seconds [ 162.585904][ T754] block nbd0: Possible stuck request ffff88801f508000: control (read@0,4096B). Runtime 120 seconds [ 192.665885][ T754] block nbd0: Possible stuck request ffff88801f508000: control (read@0,4096B). Runtime 150 seconds [ 222.324176][ T2972] udevd[2972]: worker [3608] /devices/virtual/block/nbd0 timeout; kill it [ 222.333281][ T2972] udevd[2972]: seq 7462 '/devices/virtual/block/nbd0' killed [ 222.745901][ T754] block nbd0: Possible stuck request ffff88801f508000: control (read@0,4096B). Runtime 180 seconds [ 252.825956][ T754] block nbd0: Possible stuck request ffff88801f508000: control (read@0,4096B). Runtime 210 seconds [ 282.905907][ T754] block nbd0: Possible stuck request ffff88801f508000: control (read@0,4096B). Runtime 240 seconds [ 286.106070][ T28] INFO: task syz-executor528:3606 blocked for more than 143 seconds. [ 286.114218][ T28] Not tainted 6.0.0-rc2-syzkaller-00248-ge022620b5d05 #0 [ 286.121897][ T28] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 286.130638][ T28] task:syz-executor528 state:D stack:25664 pid: 3606 ppid: 3605 flags:0x00004006 [ 286.139957][ T28] Call Trace: [ 286.143253][ T28] [ 286.146233][ T28] __schedule+0x957/0xe20 [ 286.150661][ T28] ? release_firmware_map_entry+0x184/0x184 [ 286.156584][ T28] ? __mutex_trylock_common+0x8e/0x2f0 [ 286.162114][ T28] ? do_raw_spin_unlock+0x134/0x8a0 [ 286.167377][ T28] schedule+0xcb/0x190 [ 286.171450][ T28] schedule_preempt_disabled+0xf/0x20 [ 286.176847][ T28] __mutex_lock_common+0xecf/0x26c0 [ 286.182104][ T28] ? blkdev_put+0x100/0x730 [ 286.186696][ T28] ? mutex_lock_io_nested+0x60/0x60 [ 286.191920][ T28] ? __fsnotify_parent+0x4fd/0x710 [ 286.197240][ T28] ? blkdev_open+0x2e0/0x2e0 [ 286.201843][ T28] mutex_lock_nested+0x17/0x20 [ 286.206659][ T28] blkdev_put+0x100/0x730 [ 286.211001][ T28] ? blkdev_open+0x2e0/0x2e0 [ 286.215580][ T28] blkdev_close+0x55/0x80 [ 286.219941][ T28] __fput+0x3b9/0x820 [ 286.224026][ T28] task_work_run+0x146/0x1c0 [ 286.228676][ T28] do_exit+0x55e/0x20a0 [ 286.232876][ T28] ? mm_update_next_owner+0x6d0/0x6d0 [ 286.238304][ T28] ? lockdep_hardirqs_on_prepare+0x448/0x7b0 [ 286.244322][ T28] ? print_irqtrace_events+0x220/0x220 [ 286.249841][ T28] ? _raw_spin_lock_irq+0xdb/0x110 [ 286.254970][ T28] do_group_exit+0x23b/0x2f0 [ 286.259608][ T28] ? _raw_spin_unlock_irq+0x1f/0x40 [ 286.264812][ T28] ? lockdep_hardirqs_on+0x95/0x140 [ 286.270106][ T28] get_signal+0x172f/0x1780 [ 286.274664][ T28] ? ptrace_notify+0x340/0x340 [ 286.279458][ T28] ? do_raw_spin_unlock+0x134/0x8a0 [ 286.284764][ T28] arch_do_signal_or_restart+0x8d/0x750 [ 286.290442][ T28] ? _raw_spin_unlock_irq+0x2a/0x40 [ 286.295656][ T28] ? ptrace_notify+0x245/0x340 [ 286.300462][ T28] ? get_sigframe_size+0x10/0x10 [ 286.305416][ T28] ? vtime_user_exit+0x2b2/0x3e0 [ 286.310456][ T28] ? exit_to_user_mode_loop+0x42/0x160 [ 286.315984][ T28] exit_to_user_mode_loop+0x74/0x160 [ 286.321257][ T28] exit_to_user_mode_prepare+0xad/0x110 [ 286.326850][ T28] syscall_exit_to_user_mode+0x2e/0x60 [ 286.332323][ T28] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 286.338245][ T28] RIP: 0033:0x7ff74bc406a9 [ 286.342663][ T28] RSP: 002b:00007ffeba6d0438 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 286.351117][ T28] RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 00007ff74bc406a9 [ 286.359137][ T28] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000004 [ 286.367149][ T28] RBP: 0000000000000000 R08: 00007ffeba6d05d8 R09: 00007ffeba6d05d8 [ 286.375133][ T28] R10: 00007ffeba6d05d8 R11: 0000000000000246 R12: 00007ff74bbff730 [ 286.383160][ T28] R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 [ 286.391170][ T28] [ 286.394196][ T28] [ 286.394196][ T28] Showing all locks held in the system: [ 286.401966][ T28] 1 lock held by rcu_tasks_kthre/12: [ 286.407268][ T28] #0: ffffffff8cd20970 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 [ 286.417798][ T28] 1 lock held by rcu_tasks_trace/13: [ 286.423074][ T28] #0: ffffffff8cd21170 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 [ 286.434067][ T28] 1 lock held by khungtaskd/28: [ 286.438987][ T28] #0: ffffffff8cd207a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 [ 286.448368][ T28] 2 locks held by getty/3281: [ 286.453039][ T28] #0: ffff88814a4e5098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 [ 286.462879][ T28] #1: ffffc90002d232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6e8/0x1e50 [ 286.473052][ T28] 1 lock held by syz-executor528/3606: [ 286.478578][ T28] #0: ffff88801f4594c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x100/0x730 [ 286.488032][ T28] 1 lock held by udevd/3608: [ 286.492622][ T28] #0: ffff88801f4594c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xfd/0xa40 [ 286.502589][ T28] [ 286.504919][ T28] ============================================= [ 286.504919][ T28] [ 286.513385][ T28] NMI backtrace for cpu 0 [ 286.517707][ T28] CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.0.0-rc2-syzkaller-00248-ge022620b5d05 #0 [ 286.527496][ T28] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 [ 286.537547][ T28] Call Trace: [ 286.540817][ T28] [ 286.543741][ T28] dump_stack_lvl+0x1e3/0x2cb [ 286.548418][ T28] ? io_notif_register+0x5e7/0x5e7 [ 286.553525][ T28] ? panic+0x76b/0x76b [ 286.557628][ T28] ? console_unlock+0x6bd/0x6f0 [ 286.562474][ T28] ? console_trylock_spinning+0x450/0x450 [ 286.568202][ T28] ? nmi_cpu_backtrace+0x248/0x4b0 [ 286.573331][ T28] nmi_cpu_backtrace+0x47c/0x4b0 [ 286.578258][ T28] ? vprintk_emit+0x109/0x1e0 [ 286.582934][ T28] ? nmi_trigger_cpumask_backtrace+0x280/0x280 [ 286.589088][ T28] ? _printk+0xcf/0x10f [ 286.593233][ T28] ? panic+0x76b/0x76b [ 286.597292][ T28] ? __wake_up_klogd+0xcd/0x100 [ 286.602130][ T28] ? panic+0x76b/0x76b [ 286.606195][ T28] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 286.612289][ T28] nmi_trigger_cpumask_backtrace+0x169/0x280 [ 286.618265][ T28] watchdog+0xcd5/0xd20 [ 286.622467][ T28] kthread+0x266/0x300 [ 286.626530][ T28] ? hungtask_pm_notify+0x50/0x50 [ 286.631545][ T28] ? kthread_blkcg+0xd0/0xd0 [ 286.636125][ T28] ret_from_fork+0x1f/0x30 [ 286.640554][ T28] [ 286.643670][ T28] Sending NMI from CPU 0 to CPUs 1: [ 286.648913][ C1] NMI backtrace for cpu 1 skipped: idling at acpi_idle_enter+0x43d/0x7a0 [ 286.649951][ T28] Kernel panic - not syncing: hung_task: blocked tasks [ 286.665173][ T28] CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.0.0-rc2-syzkaller-00248-ge022620b5d05 #0 [ 286.674954][ T28] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 [ 286.684993][ T28] Call Trace: [ 286.688259][ T28] [ 286.691188][ T28] dump_stack_lvl+0x1e3/0x2cb [ 286.695851][ T28] ? io_notif_register+0x5e7/0x5e7 [ 286.700945][ T28] ? panic+0x76b/0x76b [ 286.704998][ T28] ? vscnprintf+0x59/0x80 [ 286.709313][ T28] panic+0x316/0x76b [ 286.713192][ T28] ? schedule_preempt_disabled+0x20/0x20 [ 286.718805][ T28] ? nmi_trigger_cpumask_backtrace+0x205/0x280 [ 286.724956][ T28] ? fb_is_primary_device+0xcc/0xcc [ 286.730136][ T28] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 286.736188][ T28] ? nmi_trigger_cpumask_backtrace+0x205/0x280 [ 286.742321][ T28] ? nmi_trigger_cpumask_backtrace+0x265/0x280 [ 286.748464][ T28] watchdog+0xd16/0xd20 [ 286.752617][ T28] kthread+0x266/0x300 [ 286.756687][ T28] ? hungtask_pm_notify+0x50/0x50 [ 286.761701][ T28] ? kthread_blkcg+0xd0/0xd0 [ 286.766284][ T28] ret_from_fork+0x1f/0x30 [ 286.770703][ T28] [ 286.773978][ T28] Kernel Offset: disabled [ 286.778300][ T28] Rebooting in 86400 seconds..