[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.7' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 717.637272] INFO: task syz-executor286:8100 blocked for more than 140 seconds. [ 717.644702] Not tainted 4.19.211-syzkaller #0 [ 717.650910] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.659072] syz-executor286 D28008 8100 8098 0x00000004 [ 717.664720] Call Trace: [ 717.667458] __schedule+0x887/0x2040 [ 717.671269] ? io_schedule_timeout+0x140/0x140 [ 717.675846] ? _raw_spin_unlock+0x29/0x40 [ 717.680160] schedule+0x8d/0x1b0 [ 717.683548] fuse_wait_on_page_writeback.isra.0+0x11b/0x170 [ 717.689413] ? fuse_do_ioctl+0x1850/0x1850 [ 717.693645] ? wait_woken+0x250/0x250 [ 717.697597] ? fuse_writepage_locked+0xb63/0x1010 [ 717.702448] ? fuse_writepage_locked+0x1010/0x1010 [ 717.707517] fuse_launder_page+0xb6/0xe0 [ 717.711576] invalidate_inode_pages2_range+0x795/0x1110 [ 717.716922] ? clear_shadow_entry+0x170/0x170 [ 717.721596] ? fuse_file_alloc+0x1d9/0x270 [ 717.725832] ? do_raw_spin_unlock+0x171/0x230 [ 717.730454] ? _raw_spin_unlock+0x29/0x40 [ 717.734598] ? fuse_do_open+0x1c4/0x500 [ 717.738741] fuse_finish_open+0x2e2/0x590 [ 717.742891] fuse_open_common+0x254/0x2c0 [ 717.747273] do_dentry_open+0x4aa/0x1160 [ 717.751339] ? fuse_open_common+0x2c0/0x2c0 [ 717.755651] ? inode_permission.part.0+0x10c/0x450 [ 717.760647] ? chown_common+0x550/0x550 [ 717.764617] ? inode_permission+0x3d/0x140 [ 717.768905] path_openat+0x793/0x2df0 [ 717.772705] ? path_lookupat+0x8d0/0x8d0 [ 717.776751] ? mark_held_locks+0xf0/0xf0 [ 717.780874] ? mark_held_locks+0xf0/0xf0 [ 717.784938] do_filp_open+0x18c/0x3f0 [ 717.788791] ? may_open_dev+0xf0/0xf0 [ 717.792617] ? lock_downgrade+0x720/0x720 [ 717.796744] ? lock_acquire+0x170/0x3c0 [ 717.800777] ? __alloc_fd+0x34/0x570 [ 717.804505] ? do_raw_spin_unlock+0x171/0x230 [ 717.809037] ? _raw_spin_unlock+0x29/0x40 [ 717.813186] ? __alloc_fd+0x28d/0x570 [ 717.816969] do_sys_open+0x3b3/0x520 [ 717.820760] ? filp_open+0x70/0x70 [ 717.824294] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 717.829694] ? trace_hardirqs_off_caller+0x6e/0x210 [ 717.834712] ? do_syscall_64+0x21/0x620 [ 717.838736] do_syscall_64+0xf9/0x620 [ 717.842531] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 717.847757] RIP: 0033:0x7fafb99824c9 [ 717.851466] Code: Bad RIP value. [ 717.854829] RSP: 002b:00007fafb99332f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 717.862601] RAX: ffffffffffffffda RBX: 00007fafb9a134c0 RCX: 00007fafb99824c9 [ 717.869919] RDX: 00007fafb99824c9 RSI: 0000000000000000 RDI: 00000000200001c0 [ 717.877235] RBP: 00007fafb99e0164 R08: 0000000000000000 R09: 0000000000000000 [ 717.884490] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 717.891794] R13: 00007fafb99dc158 R14: 00007fafb99de160 R15: 00007fafb9a134c8 [ 717.899147] [ 717.899147] Showing all locks held in the system: [ 717.905463] 1 lock held by khungtaskd/1571: [ 717.909849] #0: 00000000e7588019 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 717.918547] 2 locks held by syz-executor286/8100: [ 717.923375] #0: 00000000fc1ca9f9 (sb_writers#11){.+.+}, at: mnt_want_write+0x3a/0xb0 [ 717.931395] #1: 000000000aa970f1 (&sb->s_type->i_mutex_key#17){+.+.}, at: fuse_open_common+0x1bc/0x2c0 [ 717.941017] [ 717.942627] ============================================= [ 717.942627] [ 717.949705] NMI backtrace for cpu 1 [ 717.953324] CPU: 1 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 717.960755] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 717.970084] Call Trace: [ 717.972654] dump_stack+0x1fc/0x2ef [ 717.976271] nmi_cpu_backtrace.cold+0x63/0xa2 [ 717.980755] ? lapic_can_unplug_cpu+0x80/0x80 [ 717.985230] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 717.990489] watchdog+0x991/0xe60 [ 717.993923] ? reset_hung_task_detector+0x30/0x30 [ 717.998745] kthread+0x33f/0x460 [ 718.002090] ? kthread_park+0x180/0x180 [ 718.006046] ret_from_fork+0x24/0x30 [ 718.009862] Sending NMI from CPU 1 to CPUs 0: [ 718.014628] NMI backtrace for cpu 0 [ 718.014634] CPU: 0 PID: 4690 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 [ 718.014640] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.014644] RIP: 0010:do_syscall_64+0x37e/0x620 [ 718.014655] Code: fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e d4 01 00 00 83 63 08 f9 0f 1f 44 00 00 e8 d9 0b 62 00 0f 00 2d 02 e4 5f 07 <48> 83 c4 08 5b 5d 41 5c 41 5d e9 c3 0b 62 00 e8 be 0b 62 00 48 b8 [ 718.014659] RSP: 0018:ffff8880a0cf7f28 EFLAGS: 000000d3 [ 718.014666] RAX: ffff8880a0cea500 RBX: ffff8880a0cea500 RCX: ffffffff81007956 [ 718.014671] RDX: 0000000000000000 RSI: ffffffff81007997 RDI: ffff8880a0cea508 [ 718.014676] RBP: ffff8880a0cf7f58 R08: 0000000000000000 R09: 0000000000000000 [ 718.014681] R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000 [ 718.014686] R13: 0000000000000100 R14: 0000000000000000 R15: 0000000000000000 [ 718.014691] FS: 00007fba9c2298c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 718.014696] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 718.014701] CR2: 00007fba995fa000 CR3: 00000000a116f000 CR4: 00000000003406f0 [ 718.014706] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 718.014711] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 718.014713] Call Trace: [ 718.014717] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 718.014721] RIP: 0033:0x7fba9b7b8210 [ 718.014731] Code: 73 01 c3 48 8b 0d 98 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d b9 c1 20 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 [ 718.014735] RSP: 002b:00007ffecd468328 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 718.014744] RAX: 0000000000000029 RBX: 00007ffecd46ada0 RCX: 00007fba9b7b8210 [ 718.014749] RDX: 0000000000002000 RSI: 00007ffecd468ba0 RDI: 0000000000000009 [ 718.014753] RBP: 0000000000000000 R08: 0000000000000008 R09: 000000b8c573d8c3 [ 718.014758] R10: 0001c83bf385a74b R11: 0000000000000246 R12: 00007ffecd468ba0 [ 718.014763] R13: 00007ffecd46acf8 R14: 000055d5ec73f958 R15: 0005db2f32d45356 [ 718.015629] Kernel panic - not syncing: hung_task: blocked tasks [ 718.216768] CPU: 1 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.224190] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.233520] Call Trace: [ 718.236089] dump_stack+0x1fc/0x2ef [ 718.239697] panic+0x26a/0x50e [ 718.242882] ? __warn_printk+0xf3/0xf3 [ 718.246763] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.251233] ? ___preempt_schedule+0x16/0x18 [ 718.255620] ? watchdog+0x991/0xe60 [ 718.259224] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.264659] watchdog+0x9a2/0xe60 [ 718.268104] ? reset_hung_task_detector+0x30/0x30 [ 718.272934] kthread+0x33f/0x460 [ 718.276276] ? kthread_park+0x180/0x180 [ 718.280402] ret_from_fork+0x24/0x30 [ 718.284368] Kernel Offset: disabled [ 718.287985] Rebooting in 86400 seconds..