[ 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 '10.128.1.11' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 271.633061][ T27] audit: type=1400 audit(1589175790.612:8): avc: denied { execmem } for pid=7053 comm="syz-executor928" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 executing program [ 271.822608][ T7055] block nbd0: shutting down sockets [ 302.115021][ T2637] block nbd0: Possible stuck request 000000007d585d82: control (read@0,4096B). Runtime 30 seconds [ 332.193041][ T2637] block nbd0: Possible stuck request 000000007d585d82: control (read@0,4096B). Runtime 60 seconds [ 362.271290][ T2637] block nbd0: Possible stuck request 000000007d585d82: control (read@0,4096B). Runtime 90 seconds [ 392.349823][ T2637] block nbd0: Possible stuck request 000000007d585d82: control (read@0,4096B). Runtime 120 seconds [ 422.428485][ T2637] block nbd0: Possible stuck request 000000007d585d82: control (read@0,4096B). Runtime 150 seconds [ 432.028179][ T1139] INFO: task syz-executor928:7064 blocked for more than 143 seconds. [ 432.038378][ T1139] Not tainted 5.7.0-rc4-syzkaller #0 [ 432.044362][ T1139] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 432.053165][ T1139] syz-executor928 D26720 7064 7053 0x00004004 [ 432.059597][ T1139] Call Trace: [ 432.063022][ T1139] ? __schedule+0x937/0x1ff0 [ 432.067610][ T1139] ? __sched_text_start+0x8/0x8 [ 432.072580][ T1139] ? lock_downgrade+0x840/0x840 [ 432.077440][ T1139] schedule+0xd0/0x2a0 [ 432.081774][ T1139] io_schedule+0x17/0x60 [ 432.086101][ T1139] do_read_cache_page+0x648/0x1810 [ 432.091687][ T1139] ? generic_file_read_iter+0x2b10/0x2b10 [ 432.099193][ T1139] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 432.105098][ T1139] ? format_decode+0x230/0xad0 [ 432.109968][ T1139] ? page_cache_prev_miss+0x300/0x300 [ 432.115638][ T1139] read_part_sector+0xf6/0x600 [ 432.120475][ T1139] ? adfspart_check_ADFS+0x7f0/0x7f0 [ 432.125785][ T1139] adfspart_check_ICS+0x9d/0xc80 [ 432.131082][ T1139] ? pointer+0x680/0x680 [ 432.135337][ T1139] ? adfspart_check_ADFS+0x7f0/0x7f0 [ 432.140725][ T1139] ? snprintf+0xbb/0xf0 [ 432.144988][ T1139] ? vsprintf+0x30/0x30 [ 432.149502][ T1139] ? adfspart_check_ADFS+0x7f0/0x7f0 [ 432.154819][ T1139] blk_add_partitions+0x474/0xe50 [ 432.160143][ T1139] bdev_disk_changed+0x1fb/0x380 [ 432.165155][ T1139] __blkdev_get+0x130c/0x1530 [ 432.169928][ T1139] ? find_held_lock+0x2d/0x110 [ 432.174718][ T1139] ? __blkdev_put+0x6f0/0x6f0 [ 432.179618][ T1139] ? do_raw_spin_lock+0x129/0x2e0 [ 432.184661][ T1139] ? rwlock_bug.part.0+0x90/0x90 [ 432.189723][ T1139] blkdev_get+0x41/0x2b0 [ 432.194217][ T1139] ? _raw_spin_unlock+0x24/0x40 [ 432.199160][ T1139] blkdev_open+0x21d/0x2b0 [ 432.203650][ T1139] do_dentry_open+0x4ba/0x1290 [ 432.209476][ T1139] ? bd_acquire+0x2c0/0x2c0 [ 432.213974][ T1139] ? chown_common+0x550/0x550 [ 432.218775][ T1139] ? inode_permission+0xab/0x500 [ 432.223720][ T1139] path_openat+0x1e59/0x27d0 [ 432.228398][ T1139] ? path_lookupat.isra.0+0x530/0x530 [ 432.233867][ T1139] ? print_usage_bug+0x240/0x240 [ 432.238870][ T1139] do_filp_open+0x192/0x260 [ 432.243461][ T1139] ? may_open_dev+0xf0/0xf0 [ 432.248054][ T1139] ? do_raw_spin_lock+0x129/0x2e0 [ 432.253107][ T1139] ? _raw_spin_unlock+0x24/0x40 [ 432.258036][ T1139] ? __alloc_fd+0x46d/0x600 [ 432.262671][ T1139] do_sys_openat2+0x585/0x7d0 [ 432.267330][ T1139] ? file_open_root+0x400/0x400 [ 432.272260][ T1139] ? up_read+0x1ab/0x750 [ 432.276500][ T1139] do_sys_open+0xc3/0x140 [ 432.281505][ T1139] ? filp_open+0x70/0x70 [ 432.285790][ T1139] ? handle_mm_fault+0x29e/0x660 [ 432.290878][ T1139] ? trace_hardirqs_off_caller+0x55/0x230 [ 432.297308][ T1139] do_syscall_64+0xf6/0x7d0 [ 432.301894][ T1139] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 432.307965][ T1139] RIP: 0033:0x405a71 [ 432.311946][ T1139] Code: Bad RIP value. [ 432.316177][ T1139] RSP: 002b:00007f26eda2b830 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 [ 432.324652][ T1139] RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 0000000000405a71 [ 432.334157][ T1139] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007f26eda2b8d0 [ 432.342192][ T1139] RBP: 00000000006dbc40 R08: 000000000000000f R09: 00007f26eda2c700 [ 432.350260][ T1139] R10: 00007f26eda2c9d0 R11: 0000000000000293 R12: 00000000006dbc4c [ 432.358408][ T1139] R13: 00007ffcaf21940f R14: 00007f26eda2c9c0 R15: 20c49ba5e353f7cf [ 432.366527][ T1139] [ 432.366527][ T1139] Showing all locks held in the system: [ 432.374597][ T1139] 1 lock held by khungtaskd/1139: [ 432.380074][ T1139] #0: ffffffff899bebc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 432.390065][ T1139] 2 locks held by in:imklog/6726: [ 432.395193][ T1139] #0: ffff88809eddc3f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 432.404409][ T1139] #1: ffff8880aa001818 (&parent->list_lock){-.-.}-{2:2}, at: do_syslog+0x632/0x16d0 [ 432.414112][ T1139] 1 lock held by syz-executor928/7064: [ 432.419704][ T1139] #0: ffff888088cbb380 (&bdev->bd_mutex){+.+.}-{3:3}, at: __blkdev_get+0x179/0x1530 [ 432.429294][ T1139] [ 432.431607][ T1139] ============================================= [ 432.431607][ T1139] [ 432.440283][ T1139] NMI backtrace for cpu 1 [ 432.444613][ T1139] CPU: 1 PID: 1139 Comm: khungtaskd Not tainted 5.7.0-rc4-syzkaller #0 [ 432.453013][ T1139] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 432.463060][ T1139] Call Trace: [ 432.466382][ T1139] dump_stack+0x188/0x20d [ 432.470709][ T1139] nmi_cpu_backtrace.cold+0x70/0xb1 [ 432.475916][ T1139] ? lapic_can_unplug_cpu.cold+0x3b/0x3b [ 432.481529][ T1139] nmi_trigger_cpumask_backtrace+0x231/0x27e [ 432.487484][ T1139] watchdog+0xa8c/0x1010 [ 432.491725][ T1139] ? reset_hung_task_detector+0x30/0x30 [ 432.497320][ T1139] kthread+0x388/0x470 [ 432.501474][ T1139] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 432.507170][ T1139] ret_from_fork+0x24/0x30 [ 432.511813][ T1139] Sending NMI from CPU 1 to CPUs 0: [ 432.517348][ C0] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 [ 432.518630][ T1139] Kernel panic - not syncing: hung_task: blocked tasks [ 432.532815][ T1139] CPU: 1 PID: 1139 Comm: khungtaskd Not tainted 5.7.0-rc4-syzkaller #0 [ 432.541634][ T1139] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 432.551750][ T1139] Call Trace: [ 432.555037][ T1139] dump_stack+0x188/0x20d [ 432.559392][ T1139] panic+0x2e3/0x75c [ 432.563366][ T1139] ? add_taint.cold+0x16/0x16 [ 432.568217][ T1139] ? lapic_can_unplug_cpu.cold+0x3b/0x3b [ 432.574106][ T1139] ? preempt_schedule_thunk+0x16/0x18 [ 432.579465][ T1139] ? watchdog+0xa8c/0x1010 [ 432.583953][ T1139] ? nmi_trigger_cpumask_backtrace+0x214/0x27e [ 432.590297][ T1139] watchdog+0xa9d/0x1010 [ 432.594526][ T1139] ? reset_hung_task_detector+0x30/0x30 [ 432.600691][ T1139] kthread+0x388/0x470 [ 432.604757][ T1139] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 432.610472][ T1139] ret_from_fork+0x24/0x30 [ 432.616396][ T1139] Kernel Offset: disabled [ 432.620720][ T1139] Rebooting in 86400 seconds..