Warning: Permanently added '10.128.0.90' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 611.445447][ T8464] IPVS: ftp: loaded support on port[0] = 21 [ 611.492607][ T8485] netlink: 1028 bytes leftover after parsing attributes in process `syz-executor586'. [ 611.504587][ T8485] netlink: 1028 bytes leftover after parsing attributes in process `syz-executor586'. [ 864.753512][ T1616] INFO: task kworker/0:0:8456 blocked for more than 143 seconds. [ 864.761645][ T1616] Not tainted 5.11.0-rc2-syzkaller #0 [ 864.772059][ T1616] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 864.782248][ T1616] task:kworker/0:0 state:D stack:29768 pid: 8456 ppid: 2 flags:0x00004000 [ 864.792940][ T1616] Workqueue: ipv6_addrconf addrconf_verify_work [ 864.801476][ T1616] Call Trace: [ 864.805782][ T1616] __schedule+0x90c/0x21a0 [ 864.810932][ T1616] ? io_schedule_timeout+0x140/0x140 [ 864.817851][ T1616] ? _raw_spin_unlock_irq+0x1f/0x40 [ 864.823196][ T1616] ? lockdep_hardirqs_on+0x79/0x100 [ 864.831503][ T1616] schedule+0xcf/0x270 [ 864.840119][ T1616] schedule_preempt_disabled+0xf/0x20 [ 864.848887][ T1616] __mutex_lock+0x81a/0x1110 [ 864.855630][ T1616] ? addrconf_verify_work+0xa/0x20 [ 864.861505][ T1616] ? mutex_lock_io_nested+0xf60/0xf60 [ 864.871282][ T1616] ? lock_release+0x710/0x710 [ 864.878422][ T1616] ? lock_downgrade+0x6d0/0x6d0 [ 864.885357][ T1616] addrconf_verify_work+0xa/0x20 [ 864.890383][ T1616] process_one_work+0x98d/0x15f0 [ 864.897492][ T1616] ? pwq_dec_nr_in_flight+0x320/0x320 [ 864.902929][ T1616] ? rwlock_bug.part.0+0x90/0x90 [ 864.909869][ T1616] ? _raw_spin_lock_irq+0x41/0x50 [ 864.916250][ T1616] worker_thread+0x64c/0x1120 [ 864.921102][ T1616] ? __kthread_parkme+0x13f/0x1e0 [ 864.927903][ T1616] ? process_one_work+0x15f0/0x15f0 [ 864.933434][ T1616] kthread+0x3b1/0x4a0 [ 864.937843][ T1616] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 864.944074][ T1616] ret_from_fork+0x1f/0x30 [ 864.949128][ T1616] [ 864.949128][ T1616] Showing all locks held in the system: [ 864.958897][ T1616] 1 lock held by khungtaskd/1616: [ 864.965721][ T1616] #0: ffffffff8b363860 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 864.975980][ T1616] 3 locks held by kworker/0:0/8456: [ 864.981544][ T1616] #0: ffff8880215ead38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 864.992725][ T1616] #1: ffffc900017afda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 865.004041][ T1616] #2: ffffffff8c9465a8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 865.013950][ T1616] 2 locks held by syz-executor586/8485: [ 865.020072][ T1616] [ 865.022432][ T1616] ============================================= [ 865.022432][ T1616] [ 865.031105][ T1616] NMI backtrace for cpu 1 [ 865.035538][ T1616] CPU: 1 PID: 1616 Comm: khungtaskd Not tainted 5.11.0-rc2-syzkaller #0 [ 865.044066][ T1616] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 865.054153][ T1616] Call Trace: [ 865.057463][ T1616] dump_stack+0x107/0x163 [ 865.061853][ T1616] nmi_cpu_backtrace.cold+0x44/0xd7 [ 865.067096][ T1616] ? lapic_can_unplug_cpu+0x80/0x80 [ 865.072464][ T1616] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 865.078546][ T1616] watchdog+0xd43/0xfa0 [ 865.082800][ T1616] ? reset_hung_task_detector+0x30/0x30 [ 865.088374][ T1616] kthread+0x3b1/0x4a0 [ 865.092459][ T1616] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 865.098369][ T1616] ret_from_fork+0x1f/0x30 [ 865.103053][ T1616] Sending NMI from CPU 1 to CPUs 0: [ 865.108841][ C0] NMI backtrace for cpu 0 [ 865.108851][ C0] CPU: 0 PID: 4895 Comm: systemd-journal Not tainted 5.11.0-rc2-syzkaller #0 [ 865.108861][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 865.108871][ C0] RIP: 0010:security_file_free+0x2/0xd0 [ 865.108882][ C0] Code: fe ff ff e8 60 02 33 fe e9 ec fd ff ff 4c 89 e7 e8 33 02 33 fe e9 87 fc ff ff 4c 89 e7 e8 26 02 33 fe e9 1a fe ff ff 90 41 54 <49> 89 fc 55 48 bd 00 00 00 00 00 fc ff df 53 e8 6a 6e f0 fd 48 8b [ 865.108897][ C0] RSP: 0018:ffffc900017cfe70 EFLAGS: 00000293 [ 865.108911][ C0] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 865.108919][ C0] RDX: ffff888011618000 RSI: ffffffff81c04aad RDI: ffff888020aa7900 [ 865.108928][ C0] RBP: ffff888020aa7900 R08: 0000000000000000 R09: 0000000000000001 [ 865.108937][ C0] R10: ffffffff81c047b8 R11: 0000000000000000 R12: ffff888020aa7984 [ 865.108945][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: ffff888020aa7918 [ 865.108954][ C0] FS: 00007f2d3ffaa8c0(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 [ 865.108963][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 865.108971][ C0] CR2: 00007f2d3d382000 CR3: 0000000025db6000 CR4: 00000000001506f0 [ 865.108979][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 865.108988][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 865.108995][ C0] Call Trace: [ 865.109000][ C0] __fput+0x3d5/0x920 [ 865.109005][ C0] ? _raw_spin_unlock_irq+0x1f/0x40 [ 865.109011][ C0] task_work_run+0xdd/0x190 [ 865.109017][ C0] exit_to_user_mode_prepare+0x249/0x250 [ 865.109023][ C0] syscall_exit_to_user_mode+0x19/0x50 [ 865.109030][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 865.109036][ C0] RIP: 0033:0x7f2d3f53a840 [ 865.109046][ C0] Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 [ 865.109062][ C0] RSP: 002b:00007ffd607093b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 865.109076][ C0] RAX: fffffffffffffffe RBX: 00007ffd607096c0 RCX: 00007f2d3f53a840 [ 865.109085][ C0] RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 0000557af1d42fb0 [ 865.109094][ C0] RBP: 000000000000000d R08: 000000000000ffc0 R09: 00000000ffffffff [ 865.109102][ C0] R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff [ 865.109111][ C0] R13: 0000557af1d37040 R14: 00007ffd60709680 R15: 0000557af1d43000 [ 865.111004][ T1616] Kernel panic - not syncing: hung_task: blocked tasks [ 865.359869][ T1616] CPU: 1 PID: 1616 Comm: khungtaskd Not tainted 5.11.0-rc2-syzkaller #0 [ 865.368214][ T1616] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 865.378299][ T1616] Call Trace: [ 865.381597][ T1616] dump_stack+0x107/0x163 [ 865.385970][ T1616] panic+0x306/0x73d [ 865.389929][ T1616] ? __warn_printk+0xf3/0xf3 [ 865.394625][ T1616] ? lapic_can_unplug_cpu+0x80/0x80 [ 865.399844][ T1616] ? preempt_schedule_thunk+0x16/0x18 [ 865.405241][ T1616] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 865.411520][ T1616] ? watchdog.cold+0x5/0x158 [ 865.416283][ T1616] watchdog.cold+0x16/0x158 [ 865.420820][ T1616] ? reset_hung_task_detector+0x30/0x30 [ 865.426392][ T1616] kthread+0x3b1/0x4a0 [ 865.430495][ T1616] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 865.437553][ T1616] ret_from_fork+0x1f/0x30 [ 865.442661][ T1616] Kernel Offset: disabled [ 865.447003][ T1616] Rebooting in 86400 seconds..