[ 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 '10.128.1.120' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 717.649343] INFO: task syz-executor717:8135 blocked for more than 140 seconds. [ 717.656797] Not tainted 4.19.211-syzkaller #0 [ 717.663316] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.671540] syz-executor717 D27400 8135 8133 0x00000004 [ 717.677185] Call Trace: [ 717.680084] __schedule+0x887/0x2040 [ 717.683819] ? io_schedule_timeout+0x140/0x140 [ 717.688392] ? _raw_spin_unlock+0x29/0x40 [ 717.692862] schedule+0x8d/0x1b0 [ 717.696230] fuse_wait_on_page_writeback.isra.0+0x11b/0x170 [ 717.702235] ? fuse_do_ioctl+0x1850/0x1850 [ 717.706469] ? wait_woken+0x250/0x250 [ 717.710559] ? fuse_writepage_locked+0xb63/0x1010 [ 717.715414] ? fuse_writepage_locked+0x1010/0x1010 [ 717.720643] fuse_launder_page+0xb6/0xe0 [ 717.724706] invalidate_inode_pages2_range+0x795/0x1110 [ 717.730351] ? clear_shadow_entry+0x170/0x170 [ 717.734866] ? fuse_file_alloc+0x1d9/0x270 [ 717.739091] ? do_raw_spin_unlock+0x171/0x230 [ 717.744070] ? _raw_spin_unlock+0x29/0x40 [ 717.748225] ? fuse_do_open+0x1c4/0x500 [ 717.752472] fuse_finish_open+0x2e2/0x590 [ 717.756622] fuse_open_common+0x254/0x2c0 [ 717.761107] do_dentry_open+0x4aa/0x1160 [ 717.765170] ? fuse_open_common+0x2c0/0x2c0 [ 717.769773] ? inode_permission.part.0+0x10c/0x450 [ 717.774698] ? chown_common+0x550/0x550 [ 717.778654] ? inode_permission+0x3d/0x140 [ 717.783241] path_openat+0x793/0x2df0 [ 717.787048] ? path_lookupat+0x8d0/0x8d0 [ 717.791377] ? mark_held_locks+0xf0/0xf0 [ 717.795440] do_filp_open+0x18c/0x3f0 [ 717.799639] ? may_open_dev+0xf0/0xf0 [ 717.803437] ? lock_downgrade+0x720/0x720 [ 717.807567] ? lock_acquire+0x170/0x3c0 [ 717.811804] ? __alloc_fd+0x34/0x570 [ 717.815515] ? do_raw_spin_unlock+0x171/0x230 [ 717.820254] ? _raw_spin_unlock+0x29/0x40 [ 717.824400] ? __alloc_fd+0x28d/0x570 [ 717.828184] do_sys_open+0x3b3/0x520 [ 717.832155] ? filp_open+0x70/0x70 [ 717.835698] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 717.841322] ? trace_hardirqs_off_caller+0x6e/0x210 [ 717.846337] ? do_syscall_64+0x21/0x620 [ 717.850562] do_syscall_64+0xf9/0x620 [ 717.854385] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 717.859821] RIP: 0033:0x7fbe062874c9 [ 717.863531] Code: Bad RIP value. [ 717.866876] RSP: 002b:00007fbe062382f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 [ 717.874853] RAX: ffffffffffffffda RBX: 00007fbe063184c0 RCX: 00007fbe062874c9 [ 717.882309] RDX: 00007fbe062874c9 RSI: 0000000000000000 RDI: 00000000200001c0 [ 717.889823] RBP: 00007fbe062e5164 R08: 0000000000000000 R09: 0000000000000000 [ 717.897087] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 717.904607] R13: 00007fbe062e1158 R14: 00007fbe062e3160 R15: 00007fbe063184c8 [ 717.911960] [ 717.911960] Showing all locks held in the system: [ 717.918283] 1 lock held by khungtaskd/1570: [ 717.922675] #0: 00000000ddad85b9 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 717.931361] 2 locks held by syz-executor717/8135: [ 717.936192] #0: 00000000aefb4175 (sb_writers#11){.+.+}, at: mnt_want_write+0x3a/0xb0 [ 717.944221] #1: 000000001924e8c8 (&sb->s_type->i_mutex_key#17){+.+.}, at: fuse_open_common+0x1bc/0x2c0 [ 717.953849] [ 717.955465] ============================================= [ 717.955465] [ 717.962527] NMI backtrace for cpu 0 [ 717.966146] CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 717.973605] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 717.982951] Call Trace: [ 717.985524] dump_stack+0x1fc/0x2ef [ 717.989152] nmi_cpu_backtrace.cold+0x63/0xa2 [ 717.993646] ? lapic_can_unplug_cpu+0x80/0x80 [ 717.998122] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 718.003379] watchdog+0x991/0xe60 [ 718.006815] ? reset_hung_task_detector+0x30/0x30 [ 718.011650] kthread+0x33f/0x460 [ 718.014995] ? kthread_park+0x180/0x180 [ 718.018961] ret_from_fork+0x24/0x30 [ 718.022766] Sending NMI from CPU 0 to CPUs 1: [ 718.027412] NMI backtrace for cpu 1 [ 718.027418] CPU: 1 PID: 4694 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 [ 718.027424] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.027428] RIP: 0033:0x7f52be5e2200 [ 718.027438] Code: fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 f0 ff ff 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 [ 718.027442] RSP: 002b:00007ffdad704c58 EFLAGS: 00000246 [ 718.027450] RAX: 0000000000000000 RBX: 00007ffdad7076d0 RCX: 00007ffdad7076d0 [ 718.027455] RDX: 0000000000002000 RSI: 00007ffdad7054d0 RDI: 0000000000000009 [ 718.027460] RBP: 0000000000000000 R08: 0000000000000008 R09: 000000b8cb4ab8e7 [ 718.027465] R10: 0002ad2da3abeeca R11: 0000000000000202 R12: 00007ffdad7054d0 [ 718.027470] R13: 00007ffdad707628 R14: 0000563326424958 R15: 0005dab38a68fde9 [ 718.027474] FS: 00007f52bf0538c0 GS: 0000000000000000 [ 718.028299] Kernel panic - not syncing: hung_task: blocked tasks [ 718.124174] CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.131600] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.140929] Call Trace: [ 718.143507] dump_stack+0x1fc/0x2ef [ 718.147136] panic+0x26a/0x50e [ 718.150321] ? __warn_printk+0xf3/0xf3 [ 718.154193] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.158667] ? ___preempt_schedule+0x16/0x18 [ 718.163060] ? watchdog+0x991/0xe60 [ 718.166679] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.172113] watchdog+0x9a2/0xe60 [ 718.175553] ? reset_hung_task_detector+0x30/0x30 [ 718.180375] kthread+0x33f/0x460 [ 718.183722] ? kthread_park+0x180/0x180 [ 718.187677] ret_from_fork+0x24/0x30 [ 718.191537] Kernel Offset: disabled [ 718.195158] Rebooting in 86400 seconds..