[ OK ] Reached target Login Prompts. [ 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 '10.128.0.182' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 481.891223][ T8409] IPVS: ftp: loaded support on port[0] = 21 [ 716.341503][ T1644] INFO: task kworker/0:1:7 blocked for more than 143 seconds. [ 716.349697][ T1644] Not tainted 5.11.0-rc7-syzkaller #0 [ 716.358787][ T1644] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 716.371480][ T1644] task:kworker/0:1 state:D stack:26720 pid: 7 ppid: 2 flags:0x00004000 [ 716.381418][ T1644] Workqueue: ipv6_addrconf addrconf_verify_work [ 716.389822][ T1644] Call Trace: [ 716.394880][ T1644] __schedule+0x999/0xe70 [ 716.399838][ T1644] schedule+0x14b/0x200 [ 716.406132][ T1644] schedule_preempt_disabled+0xf/0x20 [ 716.413258][ T1644] __mutex_lock_common+0x124f/0x2f00 [ 716.418943][ T1644] ? addrconf_verify_work+0xa/0x20 [ 716.425737][ T1644] mutex_lock_nested+0x1a/0x20 [ 716.430808][ T1644] addrconf_verify_work+0xa/0x20 [ 716.437724][ T1644] process_one_work+0x789/0xfc0 [ 716.444188][ T1644] worker_thread+0xac1/0x1300 [ 716.449535][ T1644] ? rcu_lock_release+0x20/0x20 [ 716.456116][ T1644] kthread+0x39a/0x3c0 [ 716.460480][ T1644] ? rcu_lock_release+0x20/0x20 [ 716.467295][ T1644] ? kthread_blkcg+0xd0/0xd0 [ 716.473229][ T1644] ret_from_fork+0x1f/0x30 [ 716.478301][ T1644] [ 716.478301][ T1644] Showing all locks held in the system: [ 716.487837][ T1644] 3 locks held by kworker/0:1/7: [ 716.495898][ T1644] #0: ffff888147986538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfc0 [ 716.508442][ T1644] #1: ffffc90000cc7d78 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x733/0xfc0 [ 716.521354][ T1644] #2: ffffffff8d6ee748 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 716.531085][ T1644] 1 lock held by khungtaskd/1644: [ 716.536844][ T1644] #0: ffffffff8c711680 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 [ 716.547180][ T1644] 1 lock held by in:imklog/8099: [ 716.552944][ T1644] #0: ffff8880177ad9f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 [ 716.563753][ T1644] 1 lock held by syz-executor534/8430: [ 716.569760][ T1644] [ 716.572857][ T1644] ============================================= [ 716.572857][ T1644] [ 716.582909][ T1644] NMI backtrace for cpu 0 [ 716.587426][ T1644] CPU: 0 PID: 1644 Comm: khungtaskd Not tainted 5.11.0-rc7-syzkaller #0 [ 716.596096][ T1644] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.606915][ T1644] Call Trace: [ 716.610384][ T1644] dump_stack+0x137/0x1be [ 716.615425][ T1644] ? nmi_cpu_backtrace+0x94/0x190 [ 716.620659][ T1644] ? trace_vector_free_moved+0x1a0/0x1a0 [ 716.627018][ T1644] nmi_cpu_backtrace+0x16c/0x190 [ 716.633268][ T1644] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 716.639542][ T1644] nmi_trigger_cpumask_backtrace+0x191/0x2f0 [ 716.647291][ T1644] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 716.653744][ T1644] watchdog+0xce9/0xd30 [ 716.658484][ T1644] ? hungtask_pm_notify+0x50/0x50 [ 716.663878][ T1644] kthread+0x39a/0x3c0 [ 716.668076][ T1644] ? hungtask_pm_notify+0x50/0x50 [ 716.673491][ T1644] ? kthread_blkcg+0xd0/0xd0 [ 716.678322][ T1644] ret_from_fork+0x1f/0x30 [ 716.683098][ T1644] Sending NMI from CPU 0 to CPUs 1: [ 716.689359][ C1] NMI backtrace for cpu 1 [ 716.689367][ C1] CPU: 1 PID: 4860 Comm: systemd-journal Not tainted 5.11.0-rc7-syzkaller #0 [ 716.689372][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.689376][ C1] RIP: 0010:trace_lock_acquire+0xb/0x180 [ 716.689381][ C1] Code: 8c 49 ff ff ff 48 c7 c7 08 c4 b3 8d e8 be cf 5f 00 e9 38 ff ff ff 66 0f 1f 84 00 00 00 00 00 55 41 57 41 56 41 55 41 54 53 50 <0f> 1f 44 00 00 65 8b 05 a1 12 a6 7e 83 f8 08 0f 83 86 00 00 00 89 [ 716.689388][ C1] RSP: 0018:ffffc90009dbfa00 EFLAGS: 00000296 [ 716.689396][ C1] RAX: bbc3f5f7a9812700 RBX: ffff8880291f7b18 RCX: 0000000000000000 [ 716.689400][ C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880291f7b18 [ 716.689404][ C1] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 716.689408][ C1] R10: fffff520000d90ed R11: 0000000000000000 R12: 0000000000000001 [ 716.689412][ C1] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 716.689416][ C1] FS: 00007fab19b8c8c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 716.689420][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 716.689424][ C1] CR2: 00007fab16f5b010 CR3: 0000000011e34000 CR4: 00000000001506e0 [ 716.689428][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 716.689432][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 716.689436][ C1] Call Trace: [ 716.689438][ C1] lock_acquire+0x39/0x5e0 [ 716.689440][ C1] ? __d_lookup+0x23f/0x750 [ 716.689443][ C1] _raw_spin_lock+0x2a/0x40 [ 716.689446][ C1] ? __d_lookup+0x23f/0x750 [ 716.689448][ C1] __d_lookup+0x23f/0x750 [ 716.689451][ C1] lookup_fast+0x99/0x6f0 [ 716.689453][ C1] walk_component+0x72/0x6b0 [ 716.689456][ C1] ? bpf_lsm_inode_permission+0x5/0x10 [ 716.689459][ C1] link_path_walk+0x5e7/0xc10 [ 716.689462][ C1] filename_parentat+0x1b1/0xf60 [ 716.689465][ C1] ? __virt_addr_valid+0x21b/0x2d0 [ 716.689468][ C1] ? __phys_addr_symbol+0x2b/0x70 [ 716.689471][ C1] ? __check_object_size+0x2f3/0x3f0 [ 716.689473][ C1] filename_create+0x5e/0x6b0 [ 716.689476][ C1] ? getname_flags+0x1fe/0x640 [ 716.689479][ C1] do_mkdirat+0x56/0x310 [ 716.689481][ C1] do_syscall_64+0x2d/0x70 [ 716.689484][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 716.689487][ C1] RIP: 0033:0x7fab18e47687 [ 716.689491][ C1] Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48 [ 716.689498][ C1] RSP: 002b:00007ffd410296b8 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 [ 716.689504][ C1] RAX: ffffffffffffffda RBX: 00007ffd4102c720 RCX: 00007fab18e47687 [ 716.689508][ C1] RDX: 0000000000000000 RSI: 00000000000001ed RDI: 000055f1bdf678a0 [ 716.689512][ C1] RBP: 00007ffd410296f0 R08: 000055f1bcfae3e5 R09: 0000000000000018 [ 716.689516][ C1] R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 [ 716.689520][ C1] R13: 0000000000000001 R14: 000055f1bdf678a0 R15: 00007ffd41029d30 [ 716.691538][ T1644] Kernel panic - not syncing: hung_task: blocked tasks [ 717.013999][ T1644] CPU: 0 PID: 1644 Comm: khungtaskd Not tainted 5.11.0-rc7-syzkaller #0 [ 717.023332][ T1644] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 717.035737][ T1644] Call Trace: [ 717.039208][ T1644] dump_stack+0x137/0x1be [ 717.043663][ T1644] ? panic+0x1f3/0x800 [ 717.047836][ T1644] panic+0x291/0x800 [ 717.051857][ T1644] ? nmi_trigger_cpumask_backtrace+0x236/0x2f0 [ 717.058273][ T1644] ? nmi_trigger_cpumask_backtrace+0x29b/0x2f0 [ 717.065843][ T1644] ? nmi_trigger_cpumask_backtrace+0x236/0x2f0 [ 717.072260][ T1644] ? nmi_trigger_cpumask_backtrace+0x2a0/0x2f0 [ 717.078697][ T1644] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 717.084955][ T1644] watchdog+0xd29/0xd30 [ 717.089454][ T1644] ? hungtask_pm_notify+0x50/0x50 [ 717.094577][ T1644] kthread+0x39a/0x3c0 [ 717.098793][ T1644] ? hungtask_pm_notify+0x50/0x50 [ 717.104306][ T1644] ? kthread_blkcg+0xd0/0xd0 [ 717.109078][ T1644] ret_from_fork+0x1f/0x30 [ 717.115975][ T1644] Kernel Offset: disabled [ 717.120479][ T1644] Rebooting in 86400 seconds..