[ 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 '10.128.1.100' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 717.708286] INFO: task syz-executor285:8083 blocked for more than 140 seconds. [ 717.715774] Not tainted 4.19.211-syzkaller #0 [ 717.723263] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.731573] syz-executor285 D27656 8083 8081 0x00000004 [ 717.737374] Call Trace: [ 717.740335] __schedule+0x887/0x2040 [ 717.744060] ? io_schedule_timeout+0x140/0x140 [ 717.748982] ? _raw_spin_unlock+0x29/0x40 [ 717.753136] schedule+0x8d/0x1b0 [ 717.756492] fuse_wait_on_page_writeback.isra.0+0x11b/0x170 [ 717.762558] ? fuse_do_ioctl+0x1850/0x1850 [ 717.766795] ? wait_woken+0x250/0x250 [ 717.770916] ? fuse_writepage_locked+0xb63/0x1010 [ 717.775766] ? fuse_writepage_locked+0x1010/0x1010 [ 717.781044] fuse_launder_page+0xb6/0xe0 [ 717.785110] invalidate_inode_pages2_range+0x795/0x1110 [ 717.790814] ? clear_shadow_entry+0x170/0x170 [ 717.795424] ? fuse_file_alloc+0x1d9/0x270 [ 717.800050] ? do_raw_spin_unlock+0x171/0x230 [ 717.804714] ? _raw_spin_unlock+0x29/0x40 [ 717.809355] ? fuse_do_open+0x1c4/0x500 [ 717.813411] fuse_finish_open+0x2e2/0x590 [ 717.817545] fuse_open_common+0x254/0x2c0 [ 717.822195] do_dentry_open+0x4aa/0x1160 [ 717.826278] ? fuse_open_common+0x2c0/0x2c0 [ 717.830979] ? inode_permission.part.0+0x10c/0x450 [ 717.835929] ? chown_common+0x550/0x550 [ 717.840374] ? inode_permission+0x3d/0x140 [ 717.844621] path_openat+0x793/0x2df0 [ 717.848752] ? path_lookupat+0x8d0/0x8d0 [ 717.852819] ? mark_held_locks+0xf0/0xf0 [ 717.856880] do_filp_open+0x18c/0x3f0 [ 717.861235] ? may_open_dev+0xf0/0xf0 [ 717.865050] ? lock_downgrade+0x720/0x720 [ 717.869573] ? lock_acquire+0x170/0x3c0 [ 717.874524] ? __alloc_fd+0x34/0x570 [ 717.878578] ? do_raw_spin_unlock+0x171/0x230 [ 717.883086] ? _raw_spin_unlock+0x29/0x40 [ 717.887219] ? __alloc_fd+0x28d/0x570 [ 717.891361] do_sys_open+0x3b3/0x520 [ 717.895081] ? filp_open+0x70/0x70 [ 717.898943] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 717.904310] ? trace_hardirqs_off_caller+0x6e/0x210 [ 717.910005] ? do_syscall_64+0x21/0x620 [ 717.913990] do_syscall_64+0xf9/0x620 [ 717.917785] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 717.923300] RIP: 0033:0x7f4a0d39c4c9 [ 717.927021] Code: Bad RIP value. [ 717.930698] RSP: 002b:00007f4a0d34d2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 [ 717.938665] RAX: ffffffffffffffda RBX: 00007f4a0d42d4c0 RCX: 00007f4a0d39c4c9 [ 717.945926] RDX: 0000000000000300 RSI: 0000000020000100 RDI: 00000000ffffff9c [ 717.953571] RBP: 00007f4a0d3fa164 R08: 0000000000000000 R09: 0000000000000000 [ 717.961263] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 717.968807] R13: 00007f4a0d3f6158 R14: 00007f4a0d3f8160 R15: 00007f4a0d42d4c8 [ 717.976108] [ 717.976108] Showing all locks held in the system: [ 717.982810] 1 lock held by khungtaskd/1569: [ 717.987129] #0: 000000007449e919 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 717.996121] 1 lock held by systemd-journal/4689: [ 718.001170] #0: 00000000072efa8f (&rq->lock){-.-.}, at: pick_next_task_fair+0x556/0x1570 [ 718.009754] 1 lock held by in:imklog/7801: [ 718.013986] #0: 000000000dc5b557 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 718.022295] 2 locks held by syz-executor285/8083: [ 718.027139] #0: 00000000edf9f949 (sb_writers#11){.+.+}, at: mnt_want_write+0x3a/0xb0 [ 718.035452] #1: 00000000b1410c58 (&sb->s_type->i_mutex_key#17){+.+.}, at: fuse_open_common+0x1bc/0x2c0 [ 718.045405] [ 718.047027] ============================================= [ 718.047027] [ 718.054449] NMI backtrace for cpu 0 [ 718.058352] CPU: 0 PID: 1569 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.065791] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.075127] Call Trace: [ 718.077703] dump_stack+0x1fc/0x2ef [ 718.081404] nmi_cpu_backtrace.cold+0x63/0xa2 [ 718.085882] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.090360] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 718.095619] watchdog+0x991/0xe60 [ 718.099056] ? reset_hung_task_detector+0x30/0x30 [ 718.103900] kthread+0x33f/0x460 [ 718.107245] ? kthread_park+0x180/0x180 [ 718.111201] ret_from_fork+0x24/0x30 [ 718.114971] Sending NMI from CPU 0 to CPUs 1: [ 718.119853] NMI backtrace for cpu 1 [ 718.119859] CPU: 1 PID: 10 Comm: rcu_preempt Not tainted 4.19.211-syzkaller #0 [ 718.119865] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.119869] RIP: 0010:_raw_spin_lock_irqsave+0x2c/0xc0 [ 718.119880] Code: c0 80 82 f1 89 41 54 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 55 48 89 fd 80 3c 10 00 75 7f 48 83 3d 47 35 d8 01 00 74 71 9c <58> 0f 1f 44 00 00 48 ba 00 00 00 00 00 fc ff df 49 89 c4 48 c7 c0 [ 718.119884] RSP: 0000:ffff8880b5a67d28 EFLAGS: 00000286 [ 718.119891] RAX: 1ffffffff13e3050 RBX: ffff8880b5a67e80 RCX: 0000000000000000 [ 718.119896] RDX: dffffc0000000000 RSI: ffff8880b5a67e80 RDI: ffffffff89f88698 [ 718.119901] RBP: ffffffff89f88698 R08: 0000000000000000 R09: 0000000000000000 [ 718.119906] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89f88698 [ 718.119911] R13: ffffffff89f886d0 R14: ffff8880b5a67e90 R15: ffff8880b5a67e80 [ 718.119916] FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 [ 718.119921] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 718.119926] CR2: 00007f05005e4028 CR3: 00000000a1219000 CR4: 00000000003406e0 [ 718.119931] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 718.119936] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 718.119938] Call Trace: [ 718.119942] ? finish_swait+0xb2/0x260 [ 718.119945] ? rcu_gp_kthread+0xdf4/0x21c0 [ 718.119949] ? lock_acquire+0x170/0x3c0 [ 718.119952] ? __rcu_read_unlock+0x160/0x160 [ 718.119956] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 718.119960] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 718.119964] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 718.119967] ? __kthread_parkme+0x133/0x1e0 [ 718.119971] ? __rcu_read_unlock+0x160/0x160 [ 718.119974] ? kthread+0x33f/0x460 [ 718.119978] ? kthread_park+0x180/0x180 [ 718.119981] ? ret_from_fork+0x24/0x30 [ 718.120538] Kernel panic - not syncing: hung_task: blocked tasks [ 718.302417] CPU: 0 PID: 1569 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.310001] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.319577] Call Trace: [ 718.322155] dump_stack+0x1fc/0x2ef [ 718.325772] panic+0x26a/0x50e [ 718.328947] ? __warn_printk+0xf3/0xf3 [ 718.332818] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.337293] ? ___preempt_schedule+0x16/0x18 [ 718.341683] ? watchdog+0x991/0xe60 [ 718.345293] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.350895] watchdog+0x9a2/0xe60 [ 718.354356] ? reset_hung_task_detector+0x30/0x30 [ 718.359192] kthread+0x33f/0x460 [ 718.362551] ? kthread_park+0x180/0x180 [ 718.366523] ret_from_fork+0x24/0x30 [ 718.370400] Kernel Offset: disabled [ 718.374026] Rebooting in 86400 seconds..