[ 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 '10.128.10.32' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 717.693441] INFO: task syz-executor143:8105 blocked for more than 140 seconds. [ 717.700905] Not tainted 4.19.211-syzkaller #0 [ 717.707588] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.715854] syz-executor143 D27392 8105 8103 0x00000004 [ 717.721489] Call Trace: [ 717.724419] __schedule+0x887/0x2040 [ 717.728135] ? io_schedule_timeout+0x140/0x140 [ 717.732697] ? _raw_spin_unlock+0x29/0x40 [ 717.737187] schedule+0x8d/0x1b0 [ 717.740556] fuse_wait_on_page_writeback.isra.0+0x11b/0x170 [ 717.746585] ? fuse_do_ioctl+0x1850/0x1850 [ 717.750817] ? wait_woken+0x250/0x250 [ 717.754929] ? fuse_writepage_locked+0xb63/0x1010 [ 717.759772] ? fuse_writepage_locked+0x1010/0x1010 [ 717.765025] fuse_launder_page+0xb6/0xe0 [ 717.769097] invalidate_inode_pages2_range+0x795/0x1110 [ 717.774814] ? clear_shadow_entry+0x170/0x170 [ 717.779315] ? fuse_file_alloc+0x1d9/0x270 [ 717.783886] ? do_raw_spin_unlock+0x171/0x230 [ 717.788381] ? _raw_spin_unlock+0x29/0x40 [ 717.792513] ? fuse_do_open+0x1c4/0x500 [ 717.796914] fuse_finish_open+0x2e2/0x590 [ 717.801073] fuse_open_common+0x254/0x2c0 [ 717.805500] do_dentry_open+0x4aa/0x1160 [ 717.809819] ? fuse_open_common+0x2c0/0x2c0 [ 717.814550] ? inode_permission.part.0+0x10c/0x450 [ 717.819472] ? chown_common+0x550/0x550 [ 717.823703] ? inode_permission+0x3d/0x140 [ 717.827935] path_openat+0x793/0x2df0 [ 717.831727] ? path_lookupat+0x8d0/0x8d0 [ 717.836069] ? mark_held_locks+0xf0/0xf0 [ 717.840134] do_filp_open+0x18c/0x3f0 [ 717.844193] ? may_open_dev+0xf0/0xf0 [ 717.848001] ? lock_downgrade+0x720/0x720 [ 717.852141] ? lock_acquire+0x170/0x3c0 [ 717.856551] ? __alloc_fd+0x34/0x570 [ 717.860362] ? do_raw_spin_unlock+0x171/0x230 [ 717.865177] ? _raw_spin_unlock+0x29/0x40 [ 717.869329] ? __alloc_fd+0x28d/0x570 [ 717.873226] do_sys_open+0x3b3/0x520 [ 717.877269] ? filp_open+0x70/0x70 [ 717.880815] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 717.886437] ? trace_hardirqs_off_caller+0x6e/0x210 [ 717.891459] ? do_syscall_64+0x21/0x620 [ 717.895690] do_syscall_64+0xf9/0x620 [ 717.899508] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 717.904967] RIP: 0033:0x7f7c78fe44c9 [ 717.908686] Code: Bad RIP value. [ 717.912599] RSP: 002b:00007f7c78f952f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 717.920596] RAX: ffffffffffffffda RBX: 00007f7c790754c0 RCX: 00007f7c78fe44c9 [ 717.928050] RDX: 00007f7c78fe44c9 RSI: 0000000000000000 RDI: 00000000200001c0 [ 717.935553] RBP: 00007f7c79042164 R08: 0000000000000000 R09: 0000000000000000 [ 717.942820] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 717.950350] R13: 00007f7c7903e158 R14: 00007f7c79040160 R15: 00007f7c790754c8 [ 717.957827] [ 717.957827] Showing all locks held in the system: [ 717.964444] 1 lock held by khungtaskd/1570: [ 717.968777] #0: 00000000da4e9c45 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 717.977713] 1 lock held by in:imklog/7890: [ 717.981938] #0: 000000006b9fd1d0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 717.990218] 2 locks held by syz-executor143/8105: [ 717.995248] #0: 000000003823985d (sb_writers#11){.+.+}, at: mnt_want_write+0x3a/0xb0 [ 718.003215] #1: 000000001e73a638 (&sb->s_type->i_mutex_key#17){+.+.}, at: fuse_open_common+0x1bc/0x2c0 [ 718.013050] [ 718.014729] ============================================= [ 718.014729] [ 718.021731] NMI backtrace for cpu 0 [ 718.025416] CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.032881] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.042214] Call Trace: [ 718.044788] dump_stack+0x1fc/0x2ef [ 718.048401] nmi_cpu_backtrace.cold+0x63/0xa2 [ 718.052876] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.057357] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 718.062619] watchdog+0x991/0xe60 [ 718.066055] ? reset_hung_task_detector+0x30/0x30 [ 718.070876] kthread+0x33f/0x460 [ 718.074221] ? kthread_park+0x180/0x180 [ 718.078188] ret_from_fork+0x24/0x30 [ 718.081988] Sending NMI from CPU 0 to CPUs 1: [ 718.087153] NMI backtrace for cpu 1 [ 718.087159] CPU: 1 PID: 10 Comm: rcu_preempt Not tainted 4.19.211-syzkaller #0 [ 718.087164] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.087168] RIP: 0010:__lock_acquire+0x1ef/0x3ff0 [ 718.087179] Code: 48 81 c4 98 01 00 00 44 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 80 3c 02 00 <0f> 85 b3 2a 00 00 49 81 3e 20 f2 66 8c 0f 84 65 ff ff ff 83 fe 01 [ 718.087183] RSP: 0018:ffff8880b5a67858 EFLAGS: 00000046 [ 718.087191] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 718.087196] RDX: 1ffffffff1a77214 RSI: 0000000000000000 RDI: 0000000000000001 [ 718.087201] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 [ 718.087206] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001 [ 718.087211] R13: ffff8880b5a4e280 R14: ffffffff8d3b90a0 R15: 0000000000000001 [ 718.087216] FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 [ 718.087221] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 718.087226] CR2: 00007fa67f5c2000 CR3: 00000000a1b38000 CR4: 00000000003406e0 [ 718.087231] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 718.087236] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 718.087238] Call Trace: [ 718.087242] ? __lock_acquire+0x6de/0x3ff0 [ 718.087245] ? mark_held_locks+0xf0/0xf0 [ 718.087249] ? static_obj+0x50/0x50 [ 718.087252] ? mark_held_locks+0xf0/0xf0 [ 718.087256] ? __lock_acquire+0x6de/0x3ff0 [ 718.087259] lock_acquire+0x170/0x3c0 [ 718.087263] ? debug_object_assert_init+0xfd/0x2e0 [ 718.087266] _raw_spin_lock_irqsave+0x8c/0xc0 [ 718.087270] ? debug_object_assert_init+0xfd/0x2e0 [ 718.087274] debug_object_assert_init+0xfd/0x2e0 [ 718.087278] ? debug_object_free+0x380/0x380 [ 718.087281] ? _raw_spin_unlock_irq+0x5a/0x80 [ 718.087285] ? finish_task_switch+0x146/0x760 [ 718.087289] ? finish_task_switch+0x118/0x760 [ 718.087292] ? switch_mm_irqs_off+0x2e5/0x1340 [ 718.087296] ? del_timer_sync+0x75/0x270 [ 718.087299] try_to_del_timer_sync+0x6d/0x110 [ 718.087303] ? detach_if_pending+0x460/0x460 [ 718.087306] ? del_timer_sync+0x75/0x270 [ 718.087310] ? del_timer_sync+0x1cc/0x270 [ 718.087313] del_timer_sync+0x1a4/0x270 [ 718.087317] schedule_timeout+0x4d7/0xfe0 [ 718.087321] ? prepare_to_swait_event+0x5b/0x540 [ 718.087324] ? usleep_range+0x170/0x170 [ 718.087328] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 718.087332] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 718.087336] ? collect_expired_timers+0x2a0/0x2a0 [ 718.087339] ? swake_up_all+0x340/0x340 [ 718.087343] rcu_gp_kthread+0xdad/0x21c0 [ 718.087346] ? lock_acquire+0x170/0x3c0 [ 718.087350] ? __rcu_read_unlock+0x160/0x160 [ 718.087354] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 718.087358] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 718.087362] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 718.087366] ? __kthread_parkme+0x133/0x1e0 [ 718.087369] ? __rcu_read_unlock+0x160/0x160 [ 718.087372] kthread+0x33f/0x460 [ 718.087376] ? kthread_park+0x180/0x180 [ 718.087379] ret_from_fork+0x24/0x30 [ 718.087602] Kernel panic - not syncing: hung_task: blocked tasks [ 718.386948] CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.394388] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.403723] Call Trace: [ 718.406301] dump_stack+0x1fc/0x2ef [ 718.409925] panic+0x26a/0x50e [ 718.413097] ? __warn_printk+0xf3/0xf3 [ 718.416980] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.421452] ? ___preempt_schedule+0x16/0x18 [ 718.425855] ? watchdog+0x991/0xe60 [ 718.429469] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.434902] watchdog+0x9a2/0xe60 [ 718.438352] ? reset_hung_task_detector+0x30/0x30 [ 718.443183] kthread+0x33f/0x460 [ 718.446533] ? kthread_park+0x180/0x180 [ 718.450504] ret_from_fork+0x24/0x30 [ 718.454493] Kernel Offset: disabled [ 718.458115] Rebooting in 86400 seconds..