[ 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 '10.128.0.73' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 457.111584][ T6842] block nbd0: shutting down sockets [ 487.079571][ T2456] block nbd0: Possible stuck request 00000000837c66d1: control (read@0,4096B). Runtime 30 seconds [ 517.159500][ T2456] block nbd0: Possible stuck request 00000000837c66d1: control (read@0,4096B). Runtime 60 seconds [ 547.239449][ T2456] block nbd0: Possible stuck request 00000000837c66d1: control (read@0,4096B). Runtime 90 seconds [ 577.319421][ T2456] block nbd0: Possible stuck request 00000000837c66d1: control (read@0,4096B). Runtime 120 seconds [ 607.399445][ T2456] block nbd0: Possible stuck request 00000000837c66d1: control (read@0,4096B). Runtime 150 seconds [ 616.359453][ T1173] INFO: task syz-executor267:6851 blocked for more than 143 seconds. [ 616.368323][ T1173] Not tainted 5.9.0-rc3-syzkaller #0 [ 616.375176][ T1173] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.384518][ T1173] task:syz-executor267 state:D stack:27632 pid: 6851 ppid: 6840 flags:0x00004004 [ 616.394535][ T1173] Call Trace: [ 616.397975][ T1173] __schedule+0xea9/0x2230 [ 616.403420][ T1173] ? io_schedule_timeout+0x140/0x140 [ 616.408847][ T1173] ? mark_held_locks+0x9f/0xe0 [ 616.414645][ T1173] ? wait_on_page_bit_common+0x52c/0xca0 [ 616.421460][ T1173] schedule+0xd0/0x2a0 [ 616.425565][ T1173] io_schedule+0xb5/0x120 [ 616.430738][ T1173] wait_on_page_bit_common+0x52c/0xca0 [ 616.436231][ T1173] ? replace_page_cache_page+0x1620/0x1620 [ 616.442972][ T1173] ? filemap_fdatawait_keep_errors+0xe0/0xe0 [ 616.448967][ T1173] ? pagecache_get_page+0x22b/0xf70 [ 616.455411][ T1173] do_read_cache_page+0x257/0x1390 [ 616.462223][ T1173] read_part_sector+0xf6/0x5af [ 616.467020][ T1173] ? adfspart_check_ADFS+0x7f0/0x7f0 [ 616.473279][ T1173] adfspart_check_ICS+0x9d/0xc90 [ 616.478300][ T1173] ? pointer+0x970/0x970 [ 616.483475][ T1173] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 616.489040][ T1173] ? adfspart_check_ADFS+0x7f0/0x7f0 [ 616.495254][ T1173] ? snprintf+0xbb/0xf0 [ 616.499982][ T1173] ? vsprintf+0x30/0x30 [ 616.504159][ T1173] ? adfspart_check_ADFS+0x7f0/0x7f0 [ 616.510338][ T1173] blk_add_partitions+0x44b/0xe10 [ 616.515462][ T1173] bdev_disk_changed+0x1ea/0x370 [ 616.521291][ T1173] __blkdev_get+0xee4/0x1aa0 [ 616.525905][ T1173] ? freeze_bdev+0x250/0x250 [ 616.531387][ T1173] ? do_raw_spin_unlock+0x171/0x230 [ 616.536601][ T1173] blkdev_open+0x227/0x300 [ 616.541948][ T1173] do_dentry_open+0x4b9/0x11b0 [ 616.546719][ T1173] ? blkdev_get_by_path+0x100/0x100 [ 616.553420][ T1173] path_openat+0x1b9a/0x2730 [ 616.558013][ T1173] ? path_lookupat+0x830/0x830 [ 616.563666][ T1173] ? lock_is_held_type+0xbb/0xf0 [ 616.568606][ T1173] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 616.576102][ T1173] ? lock_is_held_type+0xbb/0xf0 [ 616.581591][ T1173] do_filp_open+0x17e/0x3c0 [ 616.594346][ T1173] ? may_open_dev+0xf0/0xf0 [ 616.598862][ T1173] ? do_raw_spin_lock+0x120/0x2b0 [ 616.604790][ T1173] ? rwlock_bug.part.0+0x90/0x90 [ 616.610358][ T1173] ? _raw_spin_unlock+0x24/0x40 [ 616.615272][ T1173] ? __alloc_fd+0x28d/0x600 [ 616.620654][ T1173] do_sys_openat2+0x16d/0x420 [ 616.625339][ T1173] ? build_open_flags+0x650/0x650 [ 616.631343][ T1173] __x64_sys_open+0x119/0x1c0 [ 616.636038][ T1173] ? do_sys_open+0x140/0x140 [ 616.641492][ T1173] ? check_preemption_disabled+0x50/0x130 [ 616.648528][ T1173] ? syscall_enter_from_user_mode+0x20/0x290 [ 616.655433][ T1173] ? lockdep_hardirqs_on+0x53/0x100 [ 616.661239][ T1173] do_syscall_64+0x2d/0x70 [ 616.665672][ T1173] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.672447][ T1173] RIP: 0033:0x4057a1 [ 616.676357][ T1173] Code: Bad RIP value. [ 616.681751][ T1173] RSP: 002b:00007fa71f978980 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 [ 616.690770][ T1173] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004057a1 [ 616.698755][ T1173] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fa71f978990 [ 616.707569][ T1173] RBP: 6666666666666667 R08: 000000000000000f R09: 00007fa71f979700 [ 616.716115][ T1173] R10: 00007fa71f9799d0 R11: 0000000000000293 R12: 00000000006dbc2c [ 616.724671][ T1173] R13: 00007ffe65f5395f R14: 00007fa71f9799c0 R15: 20c49ba5e353f7cf [ 616.733272][ T1173] [ 616.733272][ T1173] Showing all locks held in the system: [ 616.741537][ T1173] 1 lock held by khungtaskd/1173: [ 616.746591][ T1173] #0: ffffffff89bd6a40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 616.757386][ T1173] 1 lock held by in:imklog/6524: [ 616.762863][ T1173] #0: ffff88809ed8f430 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 616.772551][ T1173] 1 lock held by syz-executor267/6851: [ 616.778009][ T1173] #0: ffff88808aefa980 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x4b8/0x1aa0 [ 616.788359][ T1173] [ 616.791772][ T1173] ============================================= [ 616.791772][ T1173] [ 616.800785][ T1173] NMI backtrace for cpu 1 [ 616.805113][ T1173] CPU: 1 PID: 1173 Comm: khungtaskd Not tainted 5.9.0-rc3-syzkaller #0 [ 616.813336][ T1173] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.823386][ T1173] Call Trace: [ 616.826732][ T1173] dump_stack+0x198/0x1fd [ 616.831072][ T1173] nmi_cpu_backtrace.cold+0x70/0xb1 [ 616.836362][ T1173] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 616.842024][ T1173] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 616.848113][ T1173] watchdog+0xd7d/0x1000 [ 616.852392][ T1173] ? reset_hung_task_detector+0x30/0x30 [ 616.858026][ T1173] kthread+0x3b5/0x4a0 [ 616.862108][ T1173] ? __kthread_bind_mask+0xc0/0xc0 [ 616.867292][ T1173] ret_from_fork+0x1f/0x30 [ 616.871927][ T1173] Sending NMI from CPU 1 to CPUs 0: [ 616.877691][ C0] NMI backtrace for cpu 0 [ 616.877698][ C0] CPU: 0 PID: 3908 Comm: systemd-journal Not tainted 5.9.0-rc3-syzkaller #0 [ 616.877704][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.877709][ C0] RIP: 0010:trace_hardirqs_on+0x85/0x220 [ 616.877720][ C0] Code: 41 ea df ff 48 8b 7c 24 28 5b 5d 41 5c 41 5d 41 5e e9 1f 9b 79 06 e8 2a 38 fa ff 4c 8b 6c 24 28 0f 1f 44 00 00 e8 1b 38 fa ff b9 e8 14 38 fa ff 65 8b 1d 6d 80 87 7e bf 3f 00 00 00 89 de e8 [ 616.877725][ C0] RSP: 0018:ffffc900046e7d90 EFLAGS: 00000093 [ 616.877733][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817a129c [ 616.877738][ C0] RDX: ffff8880a922e040 RSI: ffffffff817a12e5 RDI: 0000000000000005 [ 616.877744][ C0] RBP: ffff88809a981240 R08: 000000005f2da179 R09: ffff8880a922e920 [ 616.877749][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000200 [ 616.877754][ C0] R13: ffffffff81b3e9a1 R14: ffffffff8358cfe3 R15: 0000000000000000 [ 616.877760][ C0] FS: 00007f4c80bbb8c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 616.877765][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 616.877770][ C0] CR2: 00007f4c7df5f018 CR3: 00000000929fe000 CR4: 00000000001506f0 [ 616.877775][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 616.877781][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 616.877784][ C0] Call Trace: [ 616.877788][ C0] ? security_cred_free+0xc3/0x130 [ 616.877791][ C0] kfree+0x221/0x2b0 [ 616.877795][ C0] security_cred_free+0xc3/0x130 [ 616.877799][ C0] put_cred_rcu+0x122/0x4a0 [ 616.877802][ C0] __put_cred+0x1de/0x250 [ 616.877806][ C0] revert_creds+0x1a8/0x1f0 [ 616.877810][ C0] do_faccessat+0x2ca/0x820 [ 616.877813][ C0] ? stream_open+0x60/0x60 [ 616.877817][ C0] ? __secure_computing+0x104/0x360 [ 616.877821][ C0] do_syscall_64+0x2d/0x70 [ 616.877825][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.877829][ C0] RIP: 0033:0x7f4c7fe779c7 [ 616.877840][ C0] Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 [ 616.877844][ C0] RSP: 002b:00007ffdac844f58 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 [ 616.877853][ C0] RAX: ffffffffffffffda RBX: 00007ffdac847e70 RCX: 00007f4c7fe779c7 [ 616.877858][ C0] RDX: 00007f4c808e8a00 RSI: 0000000000000000 RDI: 000055e0fbea49a3 [ 616.877864][ C0] RBP: 00007ffdac844f90 R08: 0000000000000000 R09: 0000000000000000 [ 616.877869][ C0] R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 [ 616.877874][ C0] R13: 0000000000000000 R14: 00007ffdac847e70 R15: 00007ffdac845480 [ 616.879163][ T1173] Kernel panic - not syncing: hung_task: blocked tasks [ 617.145444][ T1173] CPU: 1 PID: 1173 Comm: khungtaskd Not tainted 5.9.0-rc3-syzkaller #0 [ 617.154450][ T1173] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 617.164496][ T1173] Call Trace: [ 617.167777][ T1173] dump_stack+0x198/0x1fd [ 617.172217][ T1173] panic+0x347/0x7c0 [ 617.176107][ T1173] ? __warn_printk+0xf3/0xf3 [ 617.180694][ T1173] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 617.186320][ T1173] ? preempt_schedule_thunk+0x16/0x18 [ 617.191688][ T1173] ? watchdog.cold+0x5/0x16b [ 617.196264][ T1173] ? watchdog+0xa82/0x1000 [ 617.200673][ T1173] watchdog.cold+0x16/0x16b [ 617.205175][ T1173] ? reset_hung_task_detector+0x30/0x30 [ 617.210731][ T1173] kthread+0x3b5/0x4a0 [ 617.214789][ T1173] ? __kthread_bind_mask+0xc0/0xc0 [ 617.219901][ T1173] ret_from_fork+0x1f/0x30 [ 617.225602][ T1173] Kernel Offset: disabled [ 617.229941][ T1173] Rebooting in 86400 seconds..