[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 57.324031][ T26] audit: type=1800 audit(1570121440.257:25): pid=8552 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 57.346460][ T26] audit: type=1800 audit(1570121440.267:26): pid=8552 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 57.367403][ T26] audit: type=1800 audit(1570121440.267:27): pid=8552 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.131' (ECDSA) to the list of known hosts. 2019/10/03 17:06:11 parsed 1 programs 2019/10/03 17:06:13 executed programs: 0 syzkaller login: [ 990.447716][ T8721] IPVS: ftp: loaded support on port[0] = 21 [ 990.510441][ T8721] chnl_net:caif_netlink_parms(): no params data found [ 990.538947][ T8721] bridge0: port 1(bridge_slave_0) entered blocking state [ 990.547379][ T8721] bridge0: port 1(bridge_slave_0) entered disabled state [ 990.556480][ T8721] device bridge_slave_0 entered promiscuous mode [ 990.564476][ T8721] bridge0: port 2(bridge_slave_1) entered blocking state [ 990.572395][ T8721] bridge0: port 2(bridge_slave_1) entered disabled state [ 990.583647][ T8721] device bridge_slave_1 entered promiscuous mode [ 990.603639][ T8721] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 990.619459][ T8721] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 990.638132][ T8721] team0: Port device team_slave_0 added [ 990.647084][ T8721] team0: Port device team_slave_1 added [ 990.697648][ T8721] device hsr_slave_0 entered promiscuous mode [ 990.755761][ T8721] device hsr_slave_1 entered promiscuous mode [ 990.802971][ T8721] bridge0: port 2(bridge_slave_1) entered blocking state [ 990.810352][ T8721] bridge0: port 2(bridge_slave_1) entered forwarding state [ 990.818157][ T8721] bridge0: port 1(bridge_slave_0) entered blocking state [ 990.825243][ T8721] bridge0: port 1(bridge_slave_0) entered forwarding state [ 990.857240][ T8721] 8021q: adding VLAN 0 to HW filter on device bond0 [ 990.869994][ T8724] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 990.883405][ T8724] bridge0: port 1(bridge_slave_0) entered disabled state [ 990.892076][ T8724] bridge0: port 2(bridge_slave_1) entered disabled state [ 990.900940][ T8724] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 990.912413][ T8721] 8021q: adding VLAN 0 to HW filter on device team0 [ 990.922702][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 990.931513][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 990.938627][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 990.956431][ T8728] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 990.965008][ T8728] bridge0: port 2(bridge_slave_1) entered blocking state [ 990.972146][ T8728] bridge0: port 2(bridge_slave_1) entered forwarding state [ 990.980209][ T8728] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 990.991919][ T8729] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 991.000764][ T8729] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 991.012372][ T8724] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 991.024949][ T8721] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 991.037580][ T8721] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 991.046984][ T8724] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 991.063693][ T8721] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 1138.545314][ T1056] INFO: task syz-executor.0:8759 can't die for more than 143 seconds. [ 1138.553641][ T1056] syz-executor.0 D28184 8759 8721 0x00004004 [ 1138.560045][ T1056] Call Trace: [ 1138.563457][ T1056] __schedule+0x94f/0x1e70 [ 1138.567961][ T1056] ? __sched_text_start+0x8/0x8 [ 1138.572812][ T1056] ? __kasan_check_read+0x11/0x20 [ 1138.577894][ T1056] ? __lock_acquire+0x293a/0x4a00 [ 1138.582930][ T1056] schedule+0xd9/0x260 [ 1138.587040][ T1056] schedule_timeout+0x717/0xc50 [ 1138.592022][ T1056] ? find_held_lock+0x35/0x130 [ 1138.596836][ T1056] ? usleep_range+0x170/0x170 [ 1138.601919][ T1056] ? lock_downgrade+0x920/0x920 [ 1138.606809][ T1056] ? _raw_spin_unlock_irq+0x28/0x90 [ 1138.612000][ T1056] ? wait_for_completion+0x294/0x440 [ 1138.617780][ T1056] ? _raw_spin_unlock_irq+0x28/0x90 [ 1138.623002][ T1056] ? lockdep_hardirqs_on+0x421/0x5e0 [ 1138.628405][ T1056] ? trace_hardirqs_on+0x67/0x240 [ 1138.633463][ T1056] ? __kasan_check_read+0x11/0x20 [ 1138.638560][ T1056] wait_for_completion+0x29c/0x440 [ 1138.643679][ T1056] ? wait_for_completion_interruptible+0x470/0x470 [ 1138.650240][ T1056] ? wake_up_q+0xf0/0xf0 [ 1138.654494][ T1056] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1138.660796][ T1056] ? __kasan_check_read+0x11/0x20 [ 1138.665883][ T1056] __flush_work+0x508/0xa60 [ 1138.670385][ T1056] ? queue_delayed_work_on+0x210/0x210 [ 1138.675887][ T1056] ? init_pwq+0x360/0x360 [ 1138.680216][ T1056] ? __cancel_work_timer+0xc4/0x540 [ 1138.685449][ T1056] ? __cancel_work_timer+0x1e0/0x540 [ 1138.690736][ T1056] ? cancel_work_sync+0x18/0x20 [ 1138.695647][ T1056] ? __cancel_work_timer+0x1e0/0x540 [ 1138.700940][ T1056] ? lockdep_hardirqs_on+0x421/0x5e0 [ 1138.706536][ T1056] ? trace_hardirqs_on+0x67/0x240 [ 1138.711567][ T1056] __cancel_work_timer+0x3d9/0x540 [ 1138.716801][ T1056] ? p9_fd_close+0x29e/0x570 [ 1138.721399][ T1056] ? mod_delayed_work_on+0x200/0x200 [ 1138.726720][ T1056] ? lock_downgrade+0x920/0x920 [ 1138.731584][ T1056] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 1138.737444][ T1056] ? p9_fd_close+0x29e/0x570 [ 1138.742034][ T1056] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 1138.747882][ T1056] ? lockdep_hardirqs_on+0x421/0x5e0 [ 1138.753168][ T1056] ? trace_hardirqs_on+0x67/0x240 [ 1138.758253][ T1056] ? __kasan_check_read+0x11/0x20 [ 1138.763374][ T1056] cancel_work_sync+0x18/0x20 [ 1138.768150][ T1056] p9_fd_close+0x329/0x570 [ 1138.772622][ T1056] p9_client_create+0x98c/0x1430 [ 1138.777626][ T1056] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 1138.783784][ T1056] ? p9_client_zc_rpc.constprop.0+0x1120/0x1120 [ 1138.790085][ T1056] ? lockdep_init_map+0x1be/0x6d0 [ 1138.795156][ T1056] v9fs_session_init+0x1e7/0x18c0 [ 1138.800191][ T1056] ? v9fs_session_init+0x1e7/0x18c0 [ 1138.805457][ T1056] ? fs_reclaim_acquire.part.0+0x30/0x30 [ 1138.811116][ T1056] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1138.817427][ T1056] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1138.823691][ T1056] ? debug_smp_processor_id+0x3c/0x214 [ 1138.829200][ T1056] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 1138.835416][ T1056] ? v9fs_show_options+0x7e0/0x7e0 [ 1138.840519][ T1056] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 1138.846108][ T1056] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 1138.852083][ T1056] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 1138.857939][ T1056] ? kmem_cache_alloc_trace+0x397/0x790 [ 1138.863485][ T1056] ? refcount_dec_and_test_checked+0x1b/0x20 [ 1138.869510][ T1056] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 1138.875828][ T1056] v9fs_mount+0x7d/0x990 [ 1138.880064][ T1056] ? security_capable+0x95/0xc0 [ 1138.884916][ T1056] ? v9fs_write_inode+0x70/0x70 [ 1138.890110][ T1056] legacy_get_tree+0x108/0x220 [ 1138.894934][ T1056] vfs_get_tree+0x8e/0x300 [ 1138.899434][ T1056] do_mount+0x143d/0x1d10 [ 1138.903765][ T1056] ? copy_mount_string+0x40/0x40 [ 1138.908746][ T1056] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1138.914984][ T1056] ? copy_mount_options+0x2e8/0x3f0 [ 1138.920247][ T1056] ksys_mount+0xdb/0x150 [ 1138.924488][ T1056] __x64_sys_mount+0xbe/0x150 [ 1138.929202][ T1056] do_syscall_64+0xfa/0x760 [ 1138.933708][ T1056] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1138.939642][ T1056] RIP: 0033:0x459a29 [ 1138.943535][ T1056] Code: fa ff 48 8b 44 24 10 48 8b 4c 24 30 48 8d 91 d0 10 00 00 48 89 14 24 48 89 44 24 08 48 c7 44 24 10 02 00 00 00 e8 57 d8 fa ff <48> 8b 44 24 18 48 8b 4c 24 30 48 81 c1 d8 10 00 00 48 89 0c 24 48 [ 1138.963204][ T1056] RSP: 002b:00007f387f5eec78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 1138.971644][ T1056] RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459a29 [ 1138.979655][ T1056] RDX: 0000000020000140 RSI: 0000000020000000 RDI: 0000000000000000 [ 1138.987655][ T1056] RBP: 000000000075c118 R08: 00000000200005c0 R09: 0000000000000000 [ 1138.995669][ T1056] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f387f5ef6d4 [ 1139.003641][ T1056] R13: 00000000004c61d2 R14: 00000000004db1e8 R15: 00000000ffffffff [ 1139.011679][ T1056] INFO: task syz-executor.0:8759 blocked for more than 143 seconds. [ 1139.019691][ T1056] Not tainted 5.4.0-rc1-next-20191003 #0 [ 1139.025879][ T1056] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1139.034630][ T1056] syz-executor.0 D28184 8759 8721 0x00004004 [ 1139.041022][ T1056] Call Trace: [ 1139.044312][ T1056] __schedule+0x94f/0x1e70 [ 1139.048773][ T1056] ? __sched_text_start+0x8/0x8 [ 1139.053625][ T1056] ? __kasan_check_read+0x11/0x20 [ 1139.058707][ T1056] ? __lock_acquire+0x293a/0x4a00 [ 1139.063733][ T1056] schedule+0xd9/0x260 [ 1139.067837][ T1056] schedule_timeout+0x717/0xc50 [ 1139.072696][ T1056] ? find_held_lock+0x35/0x130 [ 1139.077510][ T1056] ? usleep_range+0x170/0x170 [ 1139.082202][ T1056] ? lock_downgrade+0x920/0x920 [ 1139.087096][ T1056] ? _raw_spin_unlock_irq+0x28/0x90 [ 1139.092299][ T1056] ? wait_for_completion+0x294/0x440 [ 1139.097634][ T1056] ? _raw_spin_unlock_irq+0x28/0x90 [ 1139.102834][ T1056] ? lockdep_hardirqs_on+0x421/0x5e0 [ 1139.108236][ T1056] ? trace_hardirqs_on+0x67/0x240 [ 1139.113254][ T1056] ? __kasan_check_read+0x11/0x20 [ 1139.118344][ T1056] wait_for_completion+0x29c/0x440 [ 1139.123458][ T1056] ? wait_for_completion_interruptible+0x470/0x470 [ 1139.129996][ T1056] ? wake_up_q+0xf0/0xf0 [ 1139.134235][ T1056] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1139.140524][ T1056] ? __kasan_check_read+0x11/0x20 [ 1139.145634][ T1056] __flush_work+0x508/0xa60 [ 1139.150159][ T1056] ? queue_delayed_work_on+0x210/0x210 [ 1139.155721][ T1056] ? init_pwq+0x360/0x360 [ 1139.160059][ T1056] ? __cancel_work_timer+0xc4/0x540 [ 1139.165351][ T1056] ? __cancel_work_timer+0x1e0/0x540 [ 1139.170630][ T1056] ? cancel_work_sync+0x18/0x20 [ 1139.175534][ T1056] ? __cancel_work_timer+0x1e0/0x540 [ 1139.180826][ T1056] ? lockdep_hardirqs_on+0x421/0x5e0 [ 1139.186372][ T1056] ? trace_hardirqs_on+0x67/0x240 [ 1139.191404][ T1056] __cancel_work_timer+0x3d9/0x540 [ 1139.196564][ T1056] ? p9_fd_close+0x29e/0x570 [ 1139.201172][ T1056] ? mod_delayed_work_on+0x200/0x200 [ 1139.206497][ T1056] ? lock_downgrade+0x920/0x920 [ 1139.211864][ T1056] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 1139.217718][ T1056] ? p9_fd_close+0x29e/0x570 [ 1139.222325][ T1056] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 1139.228162][ T1056] ? lockdep_hardirqs_on+0x421/0x5e0 [ 1139.233438][ T1056] ? trace_hardirqs_on+0x67/0x240 [ 1139.238507][ T1056] ? __kasan_check_read+0x11/0x20 [ 1139.243556][ T1056] cancel_work_sync+0x18/0x20 [ 1139.248281][ T1056] p9_fd_close+0x329/0x570 [ 1139.252699][ T1056] p9_client_create+0x98c/0x1430 [ 1139.257696][ T1056] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 1139.263853][ T1056] ? p9_client_zc_rpc.constprop.0+0x1120/0x1120 [ 1139.270142][ T1056] ? lockdep_init_map+0x1be/0x6d0 [ 1139.275240][ T1056] v9fs_session_init+0x1e7/0x18c0 [ 1139.280276][ T1056] ? v9fs_session_init+0x1e7/0x18c0 [ 1139.285540][ T1056] ? fs_reclaim_acquire.part.0+0x30/0x30 [ 1139.291269][ T1056] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1139.297629][ T1056] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1139.304337][ T1056] ? debug_smp_processor_id+0x3c/0x214 [ 1139.309867][ T1056] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 1139.316096][ T1056] ? v9fs_show_options+0x7e0/0x7e0 [ 1139.321235][ T1056] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 1139.326853][ T1056] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 1139.332835][ T1056] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 1139.338736][ T1056] ? kmem_cache_alloc_trace+0x397/0x790 [ 1139.344324][ T1056] ? refcount_dec_and_test_checked+0x1b/0x20 [ 1139.350375][ T1056] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 1139.356679][ T1056] v9fs_mount+0x7d/0x990 [ 1139.360970][ T1056] ? security_capable+0x95/0xc0 [ 1139.365876][ T1056] ? v9fs_write_inode+0x70/0x70 [ 1139.370728][ T1056] legacy_get_tree+0x108/0x220 [ 1139.375559][ T1056] vfs_get_tree+0x8e/0x300 [ 1139.379995][ T1056] do_mount+0x143d/0x1d10 [ 1139.384387][ T1056] ? copy_mount_string+0x40/0x40 [ 1139.389393][ T1056] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1139.395703][ T1056] ? copy_mount_options+0x2e8/0x3f0 [ 1139.400910][ T1056] ksys_mount+0xdb/0x150 [ 1139.405211][ T1056] __x64_sys_mount+0xbe/0x150 [ 1139.409886][ T1056] do_syscall_64+0xfa/0x760 [ 1139.414376][ T1056] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1139.420345][ T1056] RIP: 0033:0x459a29 [ 1139.424236][ T1056] Code: fa ff 48 8b 44 24 10 48 8b 4c 24 30 48 8d 91 d0 10 00 00 48 89 14 24 48 89 44 24 08 48 c7 44 24 10 02 00 00 00 e8 57 d8 fa ff <48> 8b 44 24 18 48 8b 4c 24 30 48 81 c1 d8 10 00 00 48 89 0c 24 48 [ 1139.444014][ T1056] RSP: 002b:00007f387f5eec78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 1139.452485][ T1056] RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459a29 [ 1139.460514][ T1056] RDX: 0000000020000140 RSI: 0000000020000000 RDI: 0000000000000000 [ 1139.468535][ T1056] RBP: 000000000075c118 R08: 00000000200005c0 R09: 0000000000000000 [ 1139.476567][ T1056] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f387f5ef6d4 [ 1139.484551][ T1056] R13: 00000000004c61d2 R14: 00000000004db1e8 R15: 00000000ffffffff [ 1139.492578][ T1056] [ 1139.492578][ T1056] Showing all locks held in the system: [ 1139.500355][ T1056] 1 lock held by khungtaskd/1056: [ 1139.505436][ T1056] #0: ffffffff88faae00 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 1139.514768][ T1056] 1 lock held by rsyslogd/8590: [ 1139.519664][ T1056] 2 locks held by getty/8680: [ 1139.524338][ T1056] #0: ffff8880a7960090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 1139.533340][ T1056] #1: ffffc90005f152e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 1139.542945][ T1056] 2 locks held by getty/8681: [ 1139.547643][ T1056] #0: ffff88809bdaf090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 1139.556639][ T1056] #1: ffffc90005f352e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 1139.566226][ T1056] 2 locks held by getty/8682: [ 1139.570910][ T1056] #0: ffff8880a3b8a090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 1139.579953][ T1056] #1: ffffc90005f192e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 1139.589570][ T1056] 2 locks held by getty/8683: [ 1139.594255][ T1056] #0: ffff888096b14090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 1139.603265][ T1056] #1: ffffc90005f392e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 1139.612877][ T1056] 2 locks held by getty/8684: [ 1139.617603][ T1056] #0: ffff888095bde090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 1139.626691][ T1056] #1: ffffc90005f312e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 1139.636392][ T1056] 2 locks held by getty/8685: [ 1139.641062][ T1056] #0: ffff8880a1885090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 1139.650070][ T1056] #1: ffffc90005f252e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 1139.659813][ T1056] 2 locks held by getty/8686: [ 1139.664471][ T1056] #0: ffff88808be72090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 1139.673538][ T1056] #1: ffffc90005f092e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 1139.683169][ T1056] 2 locks held by kworker/1:2/8724: [ 1139.688413][ T1056] #0: ffff8880aa427d28 ((wq_completion)events){+.+.}, at: process_one_work+0x88b/0x1740 [ 1139.698481][ T1056] #1: ffff888091e47dc0 ((work_completion)(&m->wq)){+.+.}, at: process_one_work+0x8c1/0x1740 [ 1139.708680][ T1056] [ 1139.711021][ T1056] ============================================= [ 1139.711021][ T1056] [ 1139.719573][ T1056] NMI backtrace for cpu 1 [ 1139.723899][ T1056] CPU: 1 PID: 1056 Comm: khungtaskd Not tainted 5.4.0-rc1-next-20191003 #0 [ 1139.732480][ T1056] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1139.742514][ T1056] Call Trace: [ 1139.745846][ T1056] dump_stack+0x172/0x1f0 [ 1139.750161][ T1056] nmi_cpu_backtrace.cold+0x70/0xb2 [ 1139.755342][ T1056] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1139.761584][ T1056] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 1139.767198][ T1056] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 1139.773160][ T1056] arch_trigger_cpumask_backtrace+0x14/0x20 [ 1139.779035][ T1056] watchdog+0xc99/0x1360 [ 1139.783278][ T1056] kthread+0x361/0x430 [ 1139.787325][ T1056] ? reset_hung_task_detector+0x30/0x30 [ 1139.792849][ T1056] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 1139.799082][ T1056] ret_from_fork+0x24/0x30 [ 1139.804456][ T1056] Sending NMI from CPU 1 to CPUs 0: [ 1139.809765][ C0] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 [ 1139.810695][ T1056] Kernel panic - not syncing: hung_task: blocked tasks [ 1139.824842][ T1056] CPU: 1 PID: 1056 Comm: khungtaskd Not tainted 5.4.0-rc1-next-20191003 #0 [ 1139.833405][ T1056] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1139.843443][ T1056] Call Trace: [ 1139.847155][ T1056] dump_stack+0x172/0x1f0 [ 1139.851493][ T1056] panic+0x2dc/0x755 [ 1139.855367][ T1056] ? add_taint.cold+0x16/0x16 [ 1139.860023][ T1056] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 1139.865720][ T1056] ? printk_safe_flush+0xf2/0x140 [ 1139.870733][ T1056] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1139.876972][ T1056] ? nmi_trigger_cpumask_backtrace+0x224/0x28b [ 1139.883103][ T1056] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 1139.889238][ T1056] watchdog+0xcaa/0x1360 [ 1139.893474][ T1056] kthread+0x361/0x430 [ 1139.897524][ T1056] ? reset_hung_task_detector+0x30/0x30 [ 1139.903046][ T1056] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 1139.909275][ T1056] ret_from_fork+0x24/0x30 [ 1139.915225][ T1056] Kernel Offset: disabled [ 1139.919590][ T1056] Rebooting in 86400 seconds..