[ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ 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 '10.128.0.109' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 1004.465305] INFO: task syz-executor761:27320 blocked for more than 140 seconds. [ 1004.472975] Not tainted 4.19.211-syzkaller #0 [ 1004.478440] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1004.486590] syz-executor761 D28416 27320 8123 0x00000004 [ 1004.492311] Call Trace: [ 1004.494959] __schedule+0x887/0x2040 [ 1004.498813] ? io_schedule_timeout+0x140/0x140 [ 1004.503568] ? mark_held_locks+0xf0/0xf0 [ 1004.507786] schedule+0x8d/0x1b0 [ 1004.511252] schedule_timeout+0x92d/0xfe0 [ 1004.515531] ? update_curr+0x28d/0x870 [ 1004.519538] ? usleep_range+0x170/0x170 [ 1004.523609] ? try_to_wake_up+0x733/0x1050 [ 1004.528002] ? wait_for_common+0x294/0x470 [ 1004.532331] ? lock_downgrade+0x720/0x720 [ 1004.536568] ? lock_acquire+0x170/0x3c0 [ 1004.540584] ? wait_for_common+0x9e/0x470 [ 1004.544753] ? _raw_spin_unlock_irq+0x24/0x80 [ 1004.549423] wait_for_common+0x29c/0x470 [ 1004.553537] ? __flush_work+0x37e/0x8b0 [ 1004.557619] ? bit_wait_io_timeout+0x100/0x100 [ 1004.562254] ? wake_up_q+0xe0/0xe0 [ 1004.565888] ? _raw_spin_unlock_irq+0x24/0x80 [ 1004.570430] __flush_work+0x4bb/0x8b0 [ 1004.574263] ? alloc_unbound_pwq+0xc10/0xc10 [ 1004.578779] ? flush_workqueue_prep_pwqs+0x570/0x570 [ 1004.583941] ? _raw_spin_unlock_irq+0x5a/0x80 [ 1004.588533] ? __flush_work+0x4cf/0x8b0 [ 1004.592589] ? trace_hardirqs_off+0x64/0x200 [ 1004.597252] ? __cancel_work_timer+0x3ba/0x590 [ 1004.601916] __cancel_work_timer+0x412/0x590 [ 1004.606447] ? try_to_grab_pending+0x6f0/0x6f0 [ 1004.611096] ? lock_downgrade+0x720/0x720 [ 1004.615337] ? lock_acquire+0x170/0x3c0 [ 1004.619350] ? p9_fd_close+0x172/0x520 [ 1004.623273] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 1004.628474] p9_fd_close+0x29c/0x520 [ 1004.632247] p9_client_create+0x901/0x12e0 [ 1004.636589] ? p9_client_flush+0x490/0x490 [ 1004.640875] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 1004.646014] ? __lockdep_init_map+0x100/0x5a0 [ 1004.650742] ? __raw_spin_lock_init+0x28/0x100 [ 1004.655432] v9fs_session_init+0x1dd/0x1770 [ 1004.659792] ? gfp_pfmemalloc_allowed+0x150/0x150 [ 1004.664636] ? v9fs_show_options+0x760/0x760 [ 1004.669123] ? lock_acquire+0x170/0x3c0 [ 1004.673102] ? check_preemption_disabled+0x41/0x280 [ 1004.678345] ? v9fs_mount+0x54/0x910 [ 1004.682065] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 1004.687152] ? kmem_cache_alloc_trace+0x323/0x380 [ 1004.691994] v9fs_mount+0x73/0x910 [ 1004.695795] ? alloc_pages_current+0x19b/0x2a0 [ 1004.700404] ? __lockdep_init_map+0x100/0x5a0 [ 1004.704897] mount_fs+0xa3/0x310 [ 1004.708337] vfs_kern_mount.part.0+0x68/0x470 [ 1004.712839] do_mount+0x115c/0x2f50 [ 1004.716534] ? copy_mount_string+0x40/0x40 [ 1004.720891] ? copy_mount_options+0x1cd/0x380 [ 1004.726938] ? copy_mount_options+0x1da/0x380 [ 1004.731496] ? copy_mount_options+0x1dd/0x380 [ 1004.736067] ? copy_mount_options+0x26f/0x380 [ 1004.740564] ksys_mount+0xcf/0x130 [ 1004.744225] __x64_sys_mount+0xba/0x150 [ 1004.748282] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 1004.752936] do_syscall_64+0xf9/0x620 [ 1004.756807] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1004.762002] RIP: 0033:0x7f8544dbf6f9 [ 1004.766048] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 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 [ 1004.785138] RSP: 002b:00007f8544d702f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 1004.792845] RAX: ffffffffffffffda RBX: 00007f8544e484c0 RCX: 00007f8544dbf6f9 [ 1004.800455] RDX: 0000000020000040 RSI: 0000000020000000 RDI: 0000000000000000 [ 1004.808077] RBP: 00007f8544e1507c R08: 0000000020000180 R09: 0000000000000000 executing program executing program executing program executing program executing program [ 1004.815414] R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e [ 1004.822804] R13: 64663d736e617274 R14: 006c6f6f74687465 R15: 00007f8544e484c8 [ 1004.830185] [ 1004.830185] Showing all locks held in the system: [ 1004.836771] 1 lock held by khungtaskd/1570: [ 1004.843180] #0: 00000000018adc24 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 1004.852844] 1 lock held by in:imklog/7787: [ 1004.857623] #0: 00000000a4778eaf (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 1004.866159] 2 locks held by kworker/0:0/11679: [ 1004.870740] #0: 00000000b5f335c4 ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 [ 1004.880811] #1: 000000009aa4ca69 ((work_completion)(&m->rq)){+.+.}, at: process_one_work+0x79c/0x1570 [ 1004.890788] [ 1004.892428] ============================================= [ 1004.892428] [ 1004.900154] NMI backtrace for cpu 0 [ 1004.903789] CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 1004.911269] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1004.920608] Call Trace: [ 1004.923197] dump_stack+0x1fc/0x2ef [ 1004.926835] nmi_cpu_backtrace.cold+0x63/0xa2 [ 1004.931341] ? lapic_can_unplug_cpu+0x80/0x80 [ 1004.935822] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 1004.941086] watchdog+0x991/0xe60 [ 1004.944527] ? reset_hung_task_detector+0x30/0x30 [ 1004.949365] kthread+0x33f/0x460 [ 1004.952727] ? kthread_park+0x180/0x180 [ 1004.956698] ret_from_fork+0x24/0x30 [ 1004.960517] Sending NMI from CPU 0 to CPUs 1: [ 1004.965080] NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 [ 1004.971996] Kernel panic - not syncing: hung_task: blocked tasks [ 1004.978825] CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 1004.986257] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1004.995624] Call Trace: [ 1004.998207] dump_stack+0x1fc/0x2ef [ 1005.001820] panic+0x26a/0x50e [ 1005.004997] ? __warn_printk+0xf3/0xf3 [ 1005.008871] ? lapic_can_unplug_cpu+0x80/0x80 [ 1005.013368] ? ___preempt_schedule+0x16/0x18 [ 1005.017762] ? watchdog+0x991/0xe60 [ 1005.021375] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 1005.026813] watchdog+0x9a2/0xe60 [ 1005.030257] ? reset_hung_task_detector+0x30/0x30 [ 1005.035087] kthread+0x33f/0x460 [ 1005.038440] ? kthread_park+0x180/0x180 [ 1005.042403] ret_from_fork+0x24/0x30 [ 1005.046277] Kernel Offset: disabled [ 1005.049909] Rebooting in 86400 seconds..