[ 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 '10.128.1.12' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 717.743268] INFO: task syz-executor313:8110 blocked for more than 140 seconds. [ 717.750768] Not tainted 4.19.211-syzkaller #0 [ 717.756037] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.764082] syz-executor313 D27504 8110 8108 0x00000004 [ 717.769706] Call Trace: [ 717.772289] __schedule+0x887/0x2040 [ 717.776080] ? io_schedule_timeout+0x140/0x140 [ 717.780674] ? _raw_spin_unlock+0x29/0x40 [ 717.784882] schedule+0x8d/0x1b0 [ 717.788262] fuse_wait_on_page_writeback.isra.0+0x11b/0x170 [ 717.794045] ? fuse_do_ioctl+0x1850/0x1850 [ 717.798292] ? wait_woken+0x250/0x250 [ 717.802083] ? fuse_writepage_locked+0xb63/0x1010 [ 717.806986] ? fuse_writepage_locked+0x1010/0x1010 [ 717.811923] fuse_launder_page+0xb6/0xe0 [ 717.816077] invalidate_inode_pages2_range+0x795/0x1110 [ 717.821454] ? clear_shadow_entry+0x170/0x170 [ 717.826017] ? fuse_file_alloc+0x1d9/0x270 [ 717.830266] ? do_raw_spin_unlock+0x171/0x230 [ 717.834827] ? _raw_spin_unlock+0x29/0x40 [ 717.838987] ? fuse_do_open+0x1c4/0x500 [ 717.842953] fuse_finish_open+0x2e2/0x590 [ 717.847179] fuse_open_common+0x254/0x2c0 [ 717.851353] do_dentry_open+0x4aa/0x1160 [ 717.855488] ? fuse_open_common+0x2c0/0x2c0 [ 717.859827] ? inode_permission.part.0+0x10c/0x450 [ 717.864820] ? chown_common+0x550/0x550 [ 717.868807] ? inode_permission+0x3d/0x140 [ 717.873130] path_openat+0x793/0x2df0 [ 717.876961] ? path_lookupat+0x8d0/0x8d0 [ 717.881012] ? mark_held_locks+0xf0/0xf0 [ 717.885143] do_filp_open+0x18c/0x3f0 [ 717.888949] ? may_open_dev+0xf0/0xf0 [ 717.892742] ? lock_downgrade+0x720/0x720 [ 717.896964] ? lock_acquire+0x170/0x3c0 [ 717.900945] ? __alloc_fd+0x34/0x570 [ 717.904719] ? do_raw_spin_unlock+0x171/0x230 [ 717.909228] ? _raw_spin_unlock+0x29/0x40 [ 717.913440] ? __alloc_fd+0x28d/0x570 [ 717.917251] do_sys_open+0x3b3/0x520 [ 717.920957] ? filp_open+0x70/0x70 [ 717.924552] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 717.929930] ? trace_hardirqs_off_caller+0x6e/0x210 [ 717.935173] ? do_syscall_64+0x21/0x620 [ 717.939155] do_syscall_64+0xf9/0x620 [ 717.942950] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 717.948192] RIP: 0033:0x7fbf4ad3b4c9 [ 717.951925] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 [ 717.970903] RSP: 002b:00007fbf4acec2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 717.978692] RAX: ffffffffffffffda RBX: 00007fbf4adcc4c0 RCX: 00007fbf4ad3b4c9 [ 717.986043] RDX: 00007fbf4ad3b4c9 RSI: 0000000000000000 RDI: 00000000200001c0 [ 717.993376] RBP: 00007fbf4ad99164 R08: 0000000000000000 R09: 0000000000000000 [ 718.000641] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 718.007968] R13: 00007fbf4ad95158 R14: 00007fbf4ad97160 R15: 00007fbf4adcc4c8 [ 718.015339] [ 718.015339] Showing all locks held in the system: [ 718.021661] 1 lock held by khungtaskd/1570: [ 718.026023] #0: 000000003edd9b83 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 718.034742] 1 lock held by in:imklog/7805: [ 718.038985] #0: 000000008d495c16 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 718.047023] 2 locks held by syz-executor313/8110: [ 718.051861] #0: 00000000a419ffe6 (sb_writers#11){.+.+}, at: mnt_want_write+0x3a/0xb0 [ 718.059902] #1: 00000000365c8ea8 (&sb->s_type->i_mutex_key#17){+.+.}, at: fuse_open_common+0x1bc/0x2c0 [ 718.069825] [ 718.071445] ============================================= [ 718.071445] [ 718.078522] NMI backtrace for cpu 1 [ 718.082153] CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.089583] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.098920] Call Trace: [ 718.101496] dump_stack+0x1fc/0x2ef [ 718.105197] nmi_cpu_backtrace.cold+0x63/0xa2 [ 718.109675] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.114152] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 718.119417] watchdog+0x991/0xe60 [ 718.122857] ? reset_hung_task_detector+0x30/0x30 [ 718.127683] kthread+0x33f/0x460 [ 718.131030] ? kthread_park+0x180/0x180 [ 718.134990] ret_from_fork+0x24/0x30 [ 718.138793] Sending NMI from CPU 1 to CPUs 0: [ 718.143697] NMI backtrace for cpu 0 [ 718.143703] CPU: 0 PID: 10 Comm: rcu_preempt Not tainted 4.19.211-syzkaller #0 [ 718.143709] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.143713] RIP: 0010:_raw_spin_lock+0x1/0x40 [ 718.143724] Code: 82 f1 89 e8 71 16 7f f9 e9 2d fe ff ff 48 89 df e8 64 16 7f f9 e9 63 fe ff ff 4c 89 ef e8 77 17 7f f9 e9 2e ff ff ff 90 90 55 <48> 89 fd bf 01 00 00 00 e8 02 22 28 f9 45 31 c9 41 b8 01 00 00 00 [ 718.143729] RSP: 0018:ffff8880b5a67d78 EFLAGS: 00000282 [ 718.143736] RAX: fffffbfff148be2c RBX: ffffffff89f88322 RCX: ffffffff89f88330 [ 718.143747] RDX: 0000000000000004 RSI: 0000000000000001 RDI: ffffffff89f889c0 [ 718.143753] RBP: ffffffff89f88280 R08: 0000000000000000 R09: 0000000000000000 [ 718.143758] R10: 0000000000000003 R11: 0000000000000000 R12: 000000010000cb2c [ 718.143762] R13: ffffffff89f88330 R14: dffffc0000000000 R15: 0000000000000001 [ 718.143768] FS: 0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 718.143773] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 718.143778] CR2: 00007fd1589f3000 CR3: 00000000a1017000 CR4: 00000000003406f0 [ 718.143783] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 718.143788] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 718.143790] Call Trace: [ 718.143794] rcu_gp_kthread+0x505/0x21c0 [ 718.143797] ? lock_acquire+0x170/0x3c0 [ 718.143801] ? __rcu_read_unlock+0x160/0x160 [ 718.143805] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 718.143808] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 718.143812] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 718.143816] ? __kthread_parkme+0x133/0x1e0 [ 718.143819] ? __rcu_read_unlock+0x160/0x160 [ 718.143823] kthread+0x33f/0x460 [ 718.143826] ? kthread_park+0x180/0x180 [ 718.143829] ret_from_fork+0x24/0x30 [ 718.144412] Kernel panic - not syncing: hung_task: blocked tasks [ 718.320354] CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.327775] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.337107] Call Trace: [ 718.339680] dump_stack+0x1fc/0x2ef [ 718.343291] panic+0x26a/0x50e [ 718.346469] ? __warn_printk+0xf3/0xf3 [ 718.350336] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.354809] ? ___preempt_schedule+0x16/0x18 [ 718.359202] ? watchdog+0x991/0xe60 [ 718.362809] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.368242] watchdog+0x9a2/0xe60 [ 718.371679] ? reset_hung_task_detector+0x30/0x30 [ 718.376501] kthread+0x33f/0x460 [ 718.379845] ? kthread_park+0x180/0x180 [ 718.383800] ret_from_fork+0x24/0x30 [ 718.387777] Kernel Offset: disabled [ 718.391473] Rebooting in 86400 seconds..