[ 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 '10.128.10.60' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 497.059840][ T26] audit: type=1400 audit(1602015806.432:8): avc: denied { execmem } for pid=6890 comm="syz-executor527" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 497.076657][ T6891] IPVS: ftp: loaded support on port[0] = 21 [ 657.908236][ T1172] INFO: task kworker/0:1:12 blocked for more than 143 seconds. [ 657.916013][ T1172] Not tainted 5.9.0-rc8-syzkaller #0 [ 657.926776][ T1172] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 657.936598][ T1172] task:kworker/0:1 state:D stack:28888 pid: 12 ppid: 2 flags:0x00004000 [ 657.948098][ T1172] Workqueue: ipv6_addrconf addrconf_verify_work [ 657.955647][ T1172] Call Trace: [ 657.960418][ T1172] __schedule+0xec9/0x2280 [ 657.964869][ T1172] ? io_schedule_timeout+0x140/0x140 [ 657.971652][ T1172] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 657.977652][ T1172] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.984397][ T1172] ? lockdep_hardirqs_on+0x53/0x100 [ 657.990559][ T1172] schedule+0xd0/0x2a0 [ 657.994663][ T1172] schedule_preempt_disabled+0xf/0x20 [ 658.001509][ T1172] __mutex_lock+0x3e2/0x10e0 [ 658.006117][ T1172] ? addrconf_verify_work+0xa/0x20 [ 658.012722][ T1172] ? mutex_lock_io_nested+0xf60/0xf60 [ 658.018998][ T1172] ? lock_release+0x8f0/0x8f0 [ 658.023687][ T1172] ? lock_downgrade+0x830/0x830 [ 658.030024][ T1172] ? _raw_spin_unlock_irq+0x1f/0x80 [ 658.035263][ T1172] ? lock_is_held_type+0xbb/0xf0 [ 658.041674][ T1172] addrconf_verify_work+0xa/0x20 [ 658.046627][ T1172] process_one_work+0x94c/0x1670 [ 658.053144][ T1172] ? lock_release+0x8f0/0x8f0 [ 658.057843][ T1172] ? pwq_dec_nr_in_flight+0x320/0x320 [ 658.064689][ T1172] ? rwlock_bug.part.0+0x90/0x90 [ 658.070573][ T1172] ? lockdep_hardirqs_off+0x96/0xd0 [ 658.075809][ T1172] worker_thread+0x64c/0x1120 [ 658.083118][ T1172] ? process_one_work+0x1670/0x1670 [ 658.089325][ T1172] kthread+0x3b5/0x4a0 [ 658.093406][ T1172] ? __kthread_bind_mask+0xc0/0xc0 [ 658.099933][ T1172] ret_from_fork+0x1f/0x30 [ 658.104543][ T1172] [ 658.104543][ T1172] Showing all locks held in the system: [ 658.113861][ T1172] 3 locks held by kworker/0:1/12: [ 658.120592][ T1172] #0: ffff8880996bb938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 658.132747][ T1172] #1: ffffc90000d2fda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 658.143963][ T1172] #2: ffffffff8b14f0c8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 658.154359][ T1172] 1 lock held by khungtaskd/1172: [ 658.160344][ T1172] #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 658.171114][ T1172] 1 lock held by in:imklog/6566: [ 658.176051][ T1172] #0: ffff8880a8e046b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 658.188113][ T1172] 4 locks held by syz-executor527/6912: [ 658.193699][ T1172] [ 658.196024][ T1172] ============================================= [ 658.196024][ T1172] [ 658.206292][ T1172] NMI backtrace for cpu 0 [ 658.210780][ T1172] CPU: 0 PID: 1172 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 658.219014][ T1172] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.229064][ T1172] Call Trace: [ 658.232447][ T1172] dump_stack+0x198/0x1fd [ 658.236785][ T1172] nmi_cpu_backtrace.cold+0x70/0xb1 [ 658.241988][ T1172] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 658.247639][ T1172] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 658.253621][ T1172] watchdog+0xd7d/0x1000 [ 658.257874][ T1172] ? reset_hung_task_detector+0x30/0x30 [ 658.263419][ T1172] kthread+0x3b5/0x4a0 [ 658.267487][ T1172] ? __kthread_bind_mask+0xc0/0xc0 [ 658.272602][ T1172] ret_from_fork+0x1f/0x30 [ 658.277164][ T1172] Sending NMI from CPU 0 to CPUs 1: [ 658.282792][ C1] NMI backtrace for cpu 1 [ 658.282799][ C1] CPU: 1 PID: 3919 Comm: systemd-journal Not tainted 5.9.0-rc8-syzkaller #0 [ 658.282806][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.282811][ C1] RIP: 0010:shmem_getpage_gfp+0x18dd/0x2430 [ 658.282822][ C1] Code: b9 c6 d5 ff 41 83 fe 03 0f 85 38 ec ff ff e9 eb f6 ff ff e8 45 ca d5 ff 48 8b ac 24 a8 00 00 00 e8 38 ca d5 ff 48 8b 74 24 08 <48> b8 00 00 00 00 00 fc ff df 48 2b 74 24 18 48 8b 54 24 68 48 c1 [ 658.282827][ C1] RSP: 0000:ffffc900052dfb08 EFLAGS: 00000293 [ 658.282836][ C1] RAX: 0000000000000000 RBX: 0000000000800000 RCX: ffffffff81a070f3 [ 658.282842][ C1] RDX: ffff8880a6a5c340 RSI: 0000000000000235 RDI: 0000000000000006 [ 658.282847][ C1] RBP: ffffea00023f0640 R08: 0000000000000001 R09: ffffea00023f0647 [ 658.282853][ C1] R10: 0000000000235000 R11: 0000000000000000 R12: 0000000000000001 [ 658.282859][ C1] R13: 0000000000000001 R14: 0000000000235000 R15: ffff8880a6125860 [ 658.282865][ C1] FS: 00007f9ebabf08c0(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 658.282870][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 658.282875][ C1] CR2: 00007f9eb7fa5008 CR3: 00000000a6de9000 CR4: 00000000001506e0 [ 658.282881][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 658.282886][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 658.282890][ C1] Call Trace: [ 658.282894][ C1] ? shmem_mfill_atomic_pte+0x1eb0/0x1eb0 [ 658.282903][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 658.282908][ C1] ? __lock_acquire+0xb92/0x5780 [ 658.282912][ C1] shmem_fault+0x1fe/0x820 [ 658.282916][ C1] ? shmem_read_mapping_page_gfp+0x170/0x170 [ 658.282921][ C1] ? count_memcg_event_mm.part.0+0x209/0x380 [ 658.282925][ C1] ? lock_downgrade+0x830/0x830 [ 658.282929][ C1] __do_fault+0x10d/0x4d0 [ 658.282933][ C1] handle_mm_fault+0x34f3/0x4590 [ 658.282937][ C1] ? vm_iomap_memory+0x190/0x190 [ 658.282941][ C1] do_user_addr_fault+0x598/0xbf0 [ 658.282945][ C1] exc_page_fault+0xa8/0x190 [ 658.282949][ C1] ? asm_exc_page_fault+0x8/0x30 [ 658.282953][ C1] asm_exc_page_fault+0x1e/0x30 [ 658.282957][ C1] RIP: 0033:0x7f9eb9efa03d [ 658.282968][ C1] Code: 0f 82 47 e5 fc ff 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 49 48 83 fa 40 0f 87 9f 00 00 00 c5 fe 6f 06 c5 fe 6f 4c 16 e0 fe 7f 07 c5 fe 7f 4c 17 e0 c5 f8 77 c3 48 3b 15 36 54 27 00 0f [ 658.282973][ C1] RSP: 002b:00007ffc62c0e2c8 EFLAGS: 00010283 [ 658.282981][ C1] RAX: 00007f9eb7fa5008 RBX: 000055f91fe20590 RCX: 0000000000234fc8 [ 658.282987][ C1] RDX: 0000000000000025 RSI: 000055f91fe20590 RDI: 00007f9eb7fa5008 [ 658.282993][ C1] RBP: 0000000000000025 R08: 000000000023502d R09: 000055f91fe20140 [ 658.282998][ C1] R10: 00007ffc62c0e470 R11: 11ac6e8ada2fe779 R12: 000055f91fe1fea0 [ 658.283004][ C1] R13: 0000000000000000 R14: 00007ffc62c0e478 R15: 00007f9eb7fa4fc8 [ 658.286031][ T1172] Kernel panic - not syncing: hung_task: blocked tasks [ 658.568421][ T1172] CPU: 0 PID: 1172 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 658.576669][ T1172] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.586734][ T1172] Call Trace: [ 658.590030][ T1172] dump_stack+0x198/0x1fd [ 658.594378][ T1172] panic+0x382/0x7fb [ 658.598277][ T1172] ? __warn_printk+0xf3/0xf3 [ 658.603044][ T1172] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 658.608677][ T1172] ? preempt_schedule_thunk+0x16/0x18 [ 658.614047][ T1172] ? watchdog.cold+0x5/0x16b [ 658.618636][ T1172] ? watchdog+0xa82/0x1000 [ 658.623073][ T1172] watchdog.cold+0x16/0x16b [ 658.627577][ T1172] ? reset_hung_task_detector+0x30/0x30 [ 658.633124][ T1172] kthread+0x3b5/0x4a0 [ 658.637201][ T1172] ? __kthread_bind_mask+0xc0/0xc0 [ 658.642313][ T1172] ret_from_fork+0x1f/0x30 [ 658.648023][ T1172] Kernel Offset: disabled [ 658.652368][ T1172] Rebooting in 86400 seconds..