[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.50' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 717.603714] INFO: task syz-executor102:8095 blocked for more than 140 seconds. [ 717.611218] Not tainted 4.19.211-syzkaller #0 [ 717.616588] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.624637] syz-executor102 D28096 8095 8093 0x00000004 [ 717.630259] Call Trace: [ 717.632837] __schedule+0x887/0x2040 [ 717.636629] ? io_schedule_timeout+0x140/0x140 [ 717.641223] ? _raw_spin_unlock+0x29/0x40 [ 717.645452] schedule+0x8d/0x1b0 [ 717.648997] fuse_wait_on_page_writeback.isra.0+0x11b/0x170 [ 717.654755] ? fuse_do_ioctl+0x1850/0x1850 [ 717.658991] ? wait_woken+0x250/0x250 [ 717.662782] ? fuse_writepage_locked+0xb63/0x1010 [ 717.667704] ? fuse_writepage_locked+0x1010/0x1010 [ 717.672675] fuse_launder_page+0xb6/0xe0 [ 717.676791] invalidate_inode_pages2_range+0x795/0x1110 [ 717.682159] ? clear_shadow_entry+0x170/0x170 [ 717.686723] ? fuse_file_alloc+0x1d9/0x270 [ 717.691007] ? do_raw_spin_unlock+0x171/0x230 [ 717.695551] ? _raw_spin_unlock+0x29/0x40 [ 717.699701] ? fuse_do_open+0x1c4/0x500 [ 717.703765] fuse_finish_open+0x2e2/0x590 [ 717.707911] fuse_open_common+0x254/0x2c0 [ 717.712041] do_dentry_open+0x4aa/0x1160 [ 717.716150] ? fuse_open_common+0x2c0/0x2c0 [ 717.720489] ? inode_permission.part.0+0x10c/0x450 [ 717.725475] ? chown_common+0x550/0x550 [ 717.729441] ? inode_permission+0x3d/0x140 [ 717.733744] path_openat+0x793/0x2df0 [ 717.737544] ? path_lookupat+0x8d0/0x8d0 [ 717.741589] ? mark_held_locks+0xf0/0xf0 [ 717.745831] do_filp_open+0x18c/0x3f0 [ 717.749684] ? may_open_dev+0xf0/0xf0 [ 717.753474] ? lock_downgrade+0x720/0x720 [ 717.757676] ? lock_acquire+0x170/0x3c0 [ 717.761656] ? __alloc_fd+0x34/0x570 [ 717.765444] ? do_raw_spin_unlock+0x171/0x230 [ 717.769935] ? _raw_spin_unlock+0x29/0x40 [ 717.774282] ? __alloc_fd+0x28d/0x570 [ 717.778101] do_sys_open+0x3b3/0x520 [ 717.781797] ? filp_open+0x70/0x70 [ 717.785400] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 717.790769] ? trace_hardirqs_off_caller+0x6e/0x210 [ 717.795832] ? do_syscall_64+0x21/0x620 [ 717.799806] do_syscall_64+0xf9/0x620 [ 717.803682] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 717.808868] RIP: 0033:0x7f26775aa4c9 [ 717.812564] Code: Bad RIP value. [ 717.815969] RSP: 002b:00007f267755b2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 717.823763] RAX: ffffffffffffffda RBX: 00007f267763b4c0 RCX: 00007f26775aa4c9 [ 717.831028] RDX: 0000000000000000 RSI: 0000000000000600 RDI: 0000000020000100 [ 717.838333] RBP: 00007f2677608164 R08: 0000000000000000 R09: 0000000000000000 [ 717.845673] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 717.852932] R13: 00007f2677604158 R14: 00007f2677606160 R15: 00007f267763b4c8 [ 717.860283] [ 717.860283] Showing all locks held in the system: [ 717.866689] 1 lock held by khungtaskd/1569: [ 717.870990] #0: 00000000939854fa (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 717.879652] 1 lock held by in:imklog/7799: [ 717.883944] #0: 00000000856e4da7 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 717.891919] 2 locks held by syz-executor102/8095: [ 717.896805] #0: 00000000b9cd85af (sb_writers#11){.+.+}, at: mnt_want_write+0x3a/0xb0 [ 717.904886] #1: 00000000b1c6cd46 (&sb->s_type->i_mutex_key#17){+.+.}, at: fuse_open_common+0x1bc/0x2c0 [ 717.914473] [ 717.916107] ============================================= [ 717.916107] [ 717.923101] NMI backtrace for cpu 1 [ 717.926824] CPU: 1 PID: 1569 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 717.934269] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 717.943610] Call Trace: [ 717.946181] dump_stack+0x1fc/0x2ef [ 717.949812] nmi_cpu_backtrace.cold+0x63/0xa2 [ 717.954289] ? lapic_can_unplug_cpu+0x80/0x80 [ 717.958764] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 717.964037] watchdog+0x991/0xe60 [ 717.967474] ? reset_hung_task_detector+0x30/0x30 [ 717.972312] kthread+0x33f/0x460 [ 717.975658] ? kthread_park+0x180/0x180 [ 717.979632] ret_from_fork+0x24/0x30 [ 717.983426] Sending NMI from CPU 1 to CPUs 0: [ 717.988535] NMI backtrace for cpu 0 [ 717.988541] CPU: 0 PID: 10 Comm: rcu_preempt Not tainted 4.19.211-syzkaller #0 [ 717.988547] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 717.988551] RIP: 0010:__lock_acquire+0x8ce/0x3ff0 [ 717.988562] Code: 14 24 e8 e5 b2 ff ff 4c 8b 14 24 85 c0 0f 84 e9 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 38 48 c1 ea 03 0f b6 04 02 <84> c0 74 08 3c 03 0f 8e 96 26 00 00 41 8b 42 20 25 00 80 04 00 3d [ 717.988566] RSP: 0018:ffff8880b5a67858 EFLAGS: 00000806 [ 717.988573] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 9810de967d633d2b [ 717.988578] RDX: 1ffff11016b49d65 RSI: 00000000425b018d RDI: 0000000000000000 [ 717.988583] RBP: ffff8880b5a4eb2a R08: 00000000bfbe7f3a R09: 0000000000000000 [ 717.988588] R10: ffff8880b5a4eb08 R11: 0000000000000000 R12: 9810de967d633d2b [ 717.988593] R13: ffff8880b5a4e280 R14: ffff8880b5a4eb20 R15: 0000000000000001 [ 717.988599] FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 717.988603] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 717.988608] CR2: 00007fa57abdc000 CR3: 00000000a31d8000 CR4: 00000000003406f0 [ 717.988613] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 717.988618] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 717.988621] Call Trace: [ 717.988624] ? __lock_acquire+0x6de/0x3ff0 [ 717.988628] ? mark_held_locks+0xf0/0xf0 [ 717.988631] ? update_curr+0x3b9/0x870 [ 717.988634] ? static_obj+0x50/0x50 [ 717.988638] ? mark_held_locks+0xf0/0xf0 [ 717.988641] ? __lock_acquire+0x6de/0x3ff0 [ 717.988645] lock_acquire+0x170/0x3c0 [ 717.988648] ? debug_object_assert_init+0xfd/0x2e0 [ 717.988652] _raw_spin_lock_irqsave+0x8c/0xc0 [ 717.988656] ? debug_object_assert_init+0xfd/0x2e0 [ 717.988660] debug_object_assert_init+0xfd/0x2e0 [ 717.988663] ? debug_object_free+0x380/0x380 [ 717.988667] ? _raw_spin_unlock_irq+0x5a/0x80 [ 717.988671] ? finish_task_switch+0x146/0x760 [ 717.988675] ? finish_task_switch+0x118/0x760 [ 717.988678] ? switch_mm_irqs_off+0x2e5/0x1340 [ 717.988682] ? del_timer_sync+0x75/0x270 [ 717.988686] try_to_del_timer_sync+0x6d/0x110 [ 717.988689] ? detach_if_pending+0x460/0x460 [ 717.988693] ? del_timer_sync+0x75/0x270 [ 717.988696] ? del_timer_sync+0x1cc/0x270 [ 717.988700] del_timer_sync+0x1a4/0x270 [ 717.988703] schedule_timeout+0x4d7/0xfe0 [ 717.988707] ? prepare_to_swait_event+0x5b/0x540 [ 717.988710] ? usleep_range+0x170/0x170 [ 717.988715] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 717.988719] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 717.988723] ? collect_expired_timers+0x2a0/0x2a0 [ 717.988726] ? swake_up_all+0x340/0x340 [ 717.988730] rcu_gp_kthread+0xdad/0x21c0 [ 717.988733] ? lock_acquire+0x170/0x3c0 [ 717.988737] ? __rcu_read_unlock+0x160/0x160 [ 717.988741] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 717.988745] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 717.988749] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 717.988753] ? __kthread_parkme+0x133/0x1e0 [ 717.988756] ? __rcu_read_unlock+0x160/0x160 [ 717.988760] kthread+0x33f/0x460 [ 717.988763] ? kthread_park+0x180/0x180 [ 717.988766] ret_from_fork+0x24/0x30 [ 717.989304] Kernel panic - not syncing: hung_task: blocked tasks [ 718.291078] CPU: 1 PID: 1569 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.298679] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.308010] Call Trace: [ 718.310586] dump_stack+0x1fc/0x2ef [ 718.314198] panic+0x26a/0x50e [ 718.317369] ? __warn_printk+0xf3/0xf3 [ 718.321236] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.325710] ? ___preempt_schedule+0x16/0x18 [ 718.330102] ? watchdog+0x991/0xe60 [ 718.333708] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.339137] watchdog+0x9a2/0xe60 [ 718.342574] ? reset_hung_task_detector+0x30/0x30 [ 718.347397] kthread+0x33f/0x460 [ 718.350742] ? kthread_park+0x180/0x180 [ 718.354705] ret_from_fork+0x24/0x30 [ 718.358681] Kernel Offset: disabled [ 718.362310] Rebooting in 86400 seconds..