[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.93' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 717.625619] INFO: task syz-executor417:8117 blocked for more than 140 seconds. [ 717.633099] Not tainted 4.19.211-syzkaller #0 [ 717.639354] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.647779] syz-executor417 D27992 8117 8115 0x00000004 [ 717.653401] Call Trace: [ 717.656349] __schedule+0x887/0x2040 [ 717.660068] ? io_schedule_timeout+0x140/0x140 [ 717.664656] ? _raw_spin_unlock+0x29/0x40 [ 717.669118] schedule+0x8d/0x1b0 [ 717.672488] fuse_wait_on_page_writeback.isra.0+0x11b/0x170 [ 717.678529] ? fuse_do_ioctl+0x1850/0x1850 [ 717.682768] ? wait_woken+0x250/0x250 [ 717.686967] ? fuse_writepage_locked+0xb63/0x1010 [ 717.691840] ? fuse_writepage_locked+0x1010/0x1010 [ 717.697200] fuse_launder_page+0xb6/0xe0 [ 717.701895] invalidate_inode_pages2_range+0x795/0x1110 [ 717.707630] ? clear_shadow_entry+0x170/0x170 [ 717.712263] ? fuse_file_alloc+0x1d9/0x270 [ 717.716952] ? do_raw_spin_unlock+0x171/0x230 [ 717.721581] ? _raw_spin_unlock+0x29/0x40 [ 717.726067] ? fuse_do_open+0x1c4/0x500 [ 717.730046] fuse_finish_open+0x2e2/0x590 [ 717.734177] fuse_open_common+0x254/0x2c0 [ 717.738927] do_dentry_open+0x4aa/0x1160 [ 717.743032] ? fuse_open_common+0x2c0/0x2c0 [ 717.747708] ? inode_permission.part.0+0x10c/0x450 [ 717.752642] ? chown_common+0x550/0x550 [ 717.757062] ? inode_permission+0x3d/0x140 [ 717.761311] path_openat+0x793/0x2df0 [ 717.765099] ? path_lookupat+0x8d0/0x8d0 [ 717.769497] ? mark_held_locks+0xf0/0xf0 [ 717.773561] do_filp_open+0x18c/0x3f0 [ 717.777761] ? may_open_dev+0xf0/0xf0 [ 717.781570] ? lock_downgrade+0x720/0x720 [ 717.786012] ? lock_acquire+0x170/0x3c0 [ 717.789982] ? __alloc_fd+0x34/0x570 [ 717.793686] ? do_raw_spin_unlock+0x171/0x230 [ 717.798512] ? _raw_spin_unlock+0x29/0x40 [ 717.802699] ? __alloc_fd+0x28d/0x570 [ 717.806860] do_sys_open+0x3b3/0x520 [ 717.810570] ? filp_open+0x70/0x70 [ 717.814107] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 717.819855] ? trace_hardirqs_off_caller+0x6e/0x210 [ 717.824993] ? do_syscall_64+0x21/0x620 [ 717.829290] do_syscall_64+0xf9/0x620 [ 717.833094] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 717.838843] RIP: 0033:0x7fd2769334c9 [ 717.842554] Code: Bad RIP value. [ 717.846198] RSP: 002b:00007fd2768e42f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 717.853904] RAX: ffffffffffffffda RBX: 00007fd2769c44c0 RCX: 00007fd2769334c9 [ 717.861490] RDX: 0000000000000000 RSI: 0000000000000700 RDI: 0000000020000100 [ 717.868991] RBP: 00007fd276991164 R08: 0000000000000000 R09: 0000000000000000 [ 717.876519] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 717.883788] R13: 00007fd27698d158 R14: 00007fd27698f160 R15: 00007fd2769c44c8 [ 717.891428] [ 717.891428] Showing all locks held in the system: [ 717.897842] 1 lock held by khungtaskd/1570: [ 717.902158] #0: 0000000034924307 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 717.910823] 2 locks held by syz-executor417/8117: [ 717.915724] #0: 0000000071a18114 (sb_writers#11){.+.+}, at: mnt_want_write+0x3a/0xb0 [ 717.923695] #1: 00000000f51e5a18 (&sb->s_type->i_mutex_key#17){+.+.}, at: fuse_open_common+0x1bc/0x2c0 [ 717.933280] [ 717.934902] ============================================= [ 717.934902] [ 717.941993] NMI backtrace for cpu 0 [ 717.945679] CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 717.953123] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 717.962458] Call Trace: [ 717.965048] dump_stack+0x1fc/0x2ef [ 717.968658] nmi_cpu_backtrace.cold+0x63/0xa2 [ 717.973135] ? lapic_can_unplug_cpu+0x80/0x80 [ 717.977626] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 717.982896] watchdog+0x991/0xe60 [ 717.986331] ? reset_hung_task_detector+0x30/0x30 [ 717.991156] kthread+0x33f/0x460 [ 717.994504] ? kthread_park+0x180/0x180 [ 717.998458] ret_from_fork+0x24/0x30 [ 718.002246] Sending NMI from CPU 0 to CPUs 1: [ 718.007152] NMI backtrace for cpu 1 [ 718.007158] CPU: 1 PID: 10 Comm: rcu_preempt Not tainted 4.19.211-syzkaller #0 [ 718.007164] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.007168] RIP: 0010:debug_lockdep_rcu_enabled+0x8e/0xe0 [ 718.007179] Code: 0d 07 53 f5 08 85 c9 74 45 65 48 8b 1c 25 c0 df 01 00 48 8d bb 84 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 32 8b [ 718.007183] RSP: 0018:ffff8880b5a67cc8 EFLAGS: 00000807 [ 718.007191] RAX: dffffc0000000000 RBX: ffff8880b5a4e280 RCX: 0000000000000001 [ 718.007195] RDX: 1ffff11016b49d60 RSI: 0000000000000002 RDI: ffff8880b5a4eb04 [ 718.007200] RBP: ffffffff89f886b0 R08: 0000000000000001 R09: 0000000000000000 [ 718.007205] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000 [ 718.007210] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 [ 718.007216] FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 [ 718.007220] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 718.007225] CR2: 00007f91bf195028 CR3: 00000000a10c4000 CR4: 00000000003406e0 [ 718.007230] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 718.007235] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 718.007237] Call Trace: [ 718.007241] lock_acquire+0x2e7/0x3c0 [ 718.007244] _raw_spin_lock_irqsave+0x8c/0xc0 [ 718.007248] ? finish_swait+0xb2/0x260 [ 718.007251] finish_swait+0xb2/0x260 [ 718.007255] rcu_gp_kthread+0xdf4/0x21c0 [ 718.007258] ? lock_acquire+0x170/0x3c0 [ 718.007262] ? __rcu_read_unlock+0x160/0x160 [ 718.007266] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 718.007269] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 718.007273] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 718.007277] ? __kthread_parkme+0x133/0x1e0 [ 718.007280] ? __rcu_read_unlock+0x160/0x160 [ 718.007284] kthread+0x33f/0x460 [ 718.007287] ? kthread_park+0x180/0x180 [ 718.007290] ret_from_fork+0x24/0x30 [ 718.007804] Kernel panic - not syncing: hung_task: blocked tasks [ 718.200605] CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.208112] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.217452] Call Trace: [ 718.220025] dump_stack+0x1fc/0x2ef [ 718.223630] panic+0x26a/0x50e [ 718.226804] ? __warn_printk+0xf3/0xf3 [ 718.230670] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 718.235755] ? cpumask_next+0x3c/0x40 [ 718.239534] ? printk_safe_flush+0xd6/0x120 [ 718.243835] ? watchdog+0x991/0xe60 [ 718.247437] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.252869] watchdog+0x9a2/0xe60 [ 718.256303] ? reset_hung_task_detector+0x30/0x30 [ 718.261126] kthread+0x33f/0x460 [ 718.264470] ? kthread_park+0x180/0x180 [ 718.268425] ret_from_fork+0x24/0x30 [ 718.272392] Kernel Offset: disabled [ 718.276008] Rebooting in 86400 seconds..