[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.75' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 477.357362][ T8464] loop0: detected capacity change from 0 to 4096 [ 477.373419][ T8464] EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue. Quota mode: writeback. [ 715.691860][ T1654] INFO: task syz-executor409:8464 blocked for more than 143 seconds. [ 715.700102][ T1654] Not tainted 5.14.0-rc7-syzkaller #0 [ 715.706909][ T1654] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 715.715810][ T1654] task:syz-executor409 state:D stack:25624 pid: 8464 ppid: 8463 flags:0x00004004 [ 715.725061][ T1654] Call Trace: [ 715.728332][ T1654] __schedule+0x93a/0x26f0 [ 715.732900][ T1654] ? io_schedule_timeout+0x140/0x140 [ 715.738184][ T1654] ? _raw_spin_unlock_irqrestore+0x50/0x70 [ 715.744023][ T1654] schedule+0xd3/0x270 [ 715.748090][ T1654] io_schedule+0xba/0x130 [ 715.752643][ T1654] bit_wait_io+0x12/0xd0 [ 715.756883][ T1654] __wait_on_bit_lock+0x121/0x1a0 [ 715.761988][ T1654] ? bit_wait+0xd0/0xd0 [ 715.766155][ T1654] out_of_line_wait_on_bit_lock+0xd5/0x110 [ 715.772794][ T1654] ? __wait_on_bit_lock+0x1a0/0x1a0 [ 715.778172][ T1654] ? var_wake_function+0x130/0x130 [ 715.783326][ T1654] __sync_dirty_buffer+0x363/0x3f0 [ 715.788436][ T1654] __ext4_handle_dirty_metadata+0x28f/0x720 [ 715.794371][ T1654] ext4_convert_inline_data_nolock+0x67a/0xf30 [ 715.800530][ T1654] ? ext4_destroy_inline_data_nolock+0x530/0x530 [ 715.806885][ T1654] ? down_write_killable_nested+0x180/0x180 [ 715.813020][ T1654] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 715.819257][ T1654] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 715.825515][ T1654] ? __ext4_journal_start_sb+0x1f1/0x4a0 [ 715.831411][ T1654] ext4_convert_inline_data+0x31a/0x490 [ 715.837017][ T1654] ? ext4_inline_data_truncate+0xb20/0xb20 [ 715.842874][ T1654] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 715.848847][ T1654] ? aa_path_link+0x2f0/0x2f0 [ 715.853646][ T1654] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 715.859970][ T1654] ? ext4_fc_start_update+0xa2/0x2e0 [ 715.865291][ T1654] ext4_fallocate+0x1ae/0x3ff0 [ 715.870056][ T1654] ? lock_release+0x720/0x720 [ 715.874789][ T1654] ? ext4_ext_truncate+0x260/0x260 [ 715.879896][ T1654] ? ext4_ext_truncate+0x260/0x260 [ 715.885030][ T1654] vfs_fallocate+0x48d/0xd80 [ 715.889621][ T1654] __x64_sys_fallocate+0xcf/0x140 [ 715.894693][ T1654] do_syscall_64+0x35/0xb0 [ 715.899110][ T1654] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 715.905033][ T1654] RIP: 0033:0x444b09 [ 715.908920][ T1654] RSP: 002b:00007fff1122eaa8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d [ 715.917405][ T1654] RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 0000000000444b09 [ 715.926328][ T1654] RDX: 0000000000000000 RSI: 0000000100000001 RDI: 0000000000000006 [ 715.934360][ T1654] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 [ 715.942391][ T1654] R10: 000000002811fdff R11: 0000000000000246 R12: 00007fff1122ead0 [ 715.950455][ T1654] R13: 0000000000000000 R14: 431bde82d7b634db R15: 00000000004004a0 [ 715.958523][ T1654] [ 715.958523][ T1654] Showing all locks held in the system: [ 715.966379][ T1654] 1 lock held by khungtaskd/1654: [ 715.971396][ T1654] #0: ffffffff8b97c280 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 715.981322][ T1654] 2 locks held by syz-executor409/8464: [ 715.987139][ T1654] #0: ffff88802f05a460 (sb_writers#5){.+.+}-{0:0}, at: __x64_sys_fallocate+0xcf/0x140 [ 715.997217][ T1654] #1: ffff8880379ea8a8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_convert_inline_data+0x21e/0x490 [ 716.007784][ T1654] [ 716.010098][ T1654] ============================================= [ 716.010098][ T1654] [ 716.018540][ T1654] NMI backtrace for cpu 0 [ 716.022901][ T1654] CPU: 0 PID: 1654 Comm: khungtaskd Not tainted 5.14.0-rc7-syzkaller #0 [ 716.031220][ T1654] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.041272][ T1654] Call Trace: [ 716.044534][ T1654] dump_stack_lvl+0xcd/0x134 [ 716.049112][ T1654] nmi_cpu_backtrace.cold+0x44/0xd7 [ 716.054288][ T1654] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.059466][ T1654] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 716.065429][ T1654] watchdog+0xd0a/0xfc0 [ 716.069566][ T1654] ? reset_hung_task_detector+0x30/0x30 [ 716.075092][ T1654] kthread+0x3e5/0x4d0 [ 716.079150][ T1654] ? set_kthread_struct+0x130/0x130 [ 716.084334][ T1654] ret_from_fork+0x1f/0x30 [ 716.088834][ T1654] Sending NMI from CPU 0 to CPUs 1: [ 716.094452][ C1] NMI backtrace for cpu 1 [ 716.094461][ C1] CPU: 1 PID: 8471 Comm: kworker/u4:0 Not tainted 5.14.0-rc7-syzkaller #0 [ 716.094469][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.094477][ C1] Workqueue: events_unbound toggle_allocation_gate [ 716.094487][ C1] RIP: 0010:kasan_check_range+0x15/0x180 [ 716.094496][ C1] Code: 39 02 0f 1f 00 48 89 f2 be f8 00 00 00 e9 a3 aa 39 02 0f 1f 00 48 85 f6 0f 84 70 01 00 00 49 89 f9 41 54 44 0f b6 c2 49 01 f1 <55> 53 0f 82 18 01 00 00 48 b8 ff ff ff ff ff 7f ff ff 48 39 c7 0f [ 716.094508][ C1] RSP: 0018:ffffc900015af948 EFLAGS: 00000286 [ 716.094517][ C1] RAX: 0000000000000000 RBX: 1ffff920002b5f2d RCX: ffffffff815b2948 [ 716.094523][ C1] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8d6c81d0 [ 716.094530][ C1] RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8d6c81d8 [ 716.094537][ C1] R10: ffffffff819871c0 R11: 0000000000000000 R12: 0000000000000000 [ 716.094544][ C1] R13: 0000000000000000 R14: ffffffff8b847e48 R15: 0000000000000000 [ 716.094551][ C1] FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 716.094558][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 716.094564][ C1] CR2: 00007fd7c14da000 CR3: 000000000b68e000 CR4: 0000000000350ee0 [ 716.094569][ C1] Call Trace: [ 716.094573][ C1] lock_acquire+0xb8/0x510 [ 716.094577][ C1] ? lock_release+0x720/0x720 [ 716.094581][ C1] __mutex_lock+0x12a/0x10a0 [ 716.094585][ C1] ? arch_jump_label_transform_queue+0x58/0x100 [ 716.094591][ C1] ? text_poke_loc_init+0x1bb/0x340 [ 716.094595][ C1] ? arch_jump_label_transform_queue+0x58/0x100 [ 716.094601][ C1] ? mutex_lock_io_nested+0xf00/0xf00 [ 716.094605][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 716.094610][ C1] ? wait_for_completion_io+0x280/0x280 [ 716.094615][ C1] ? __jump_label_patch+0xdf/0x1b0 [ 716.094620][ C1] arch_jump_label_transform_queue+0x58/0x100 [ 716.094625][ C1] __jump_label_update+0x12e/0x400 [ 716.094629][ C1] jump_label_update+0x1d5/0x430 [ 716.094634][ C1] static_key_disable_cpuslocked+0x152/0x1b0 [ 716.094639][ C1] static_key_disable+0x16/0x20 [ 716.094643][ C1] toggle_allocation_gate+0x185/0x390 [ 716.094648][ C1] ? lock_release+0x720/0x720 [ 716.094652][ C1] ? wake_up_kfence_timer+0x20/0x20 [ 716.094656][ C1] process_one_work+0x98d/0x1630 [ 716.094661][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 716.094666][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 716.094670][ C1] ? _raw_spin_lock_irq+0x41/0x50 [ 716.094674][ C1] worker_thread+0x658/0x11f0 [ 716.094679][ C1] ? process_one_work+0x1630/0x1630 [ 716.094683][ C1] kthread+0x3e5/0x4d0 [ 716.094687][ C1] ? set_kthread_struct+0x130/0x130 [ 716.094691][ C1] ret_from_fork+0x1f/0x30 [ 716.095158][ T1654] Kernel panic - not syncing: hung_task: blocked tasks [ 716.367346][ T1654] CPU: 0 PID: 1654 Comm: khungtaskd Not tainted 5.14.0-rc7-syzkaller #0 [ 716.375662][ T1654] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.385705][ T1654] Call Trace: [ 716.388972][ T1654] dump_stack_lvl+0xcd/0x134 [ 716.393555][ T1654] panic+0x306/0x73d [ 716.397436][ T1654] ? __warn_printk+0xf3/0xf3 [ 716.402097][ T1654] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.407285][ T1654] ? preempt_schedule_thunk+0x16/0x18 [ 716.412674][ T1654] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 716.418821][ T1654] ? watchdog.cold+0x5/0x158 [ 716.423401][ T1654] watchdog.cold+0x16/0x158 [ 716.427899][ T1654] ? reset_hung_task_detector+0x30/0x30 [ 716.433518][ T1654] kthread+0x3e5/0x4d0 [ 716.438967][ T1654] ? set_kthread_struct+0x130/0x130 [ 716.444151][ T1654] ret_from_fork+0x1f/0x30 [ 716.454618][ T1654] Kernel Offset: disabled [ 716.458961][ T1654] Rebooting in 86400 seconds..