[ 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 '10.128.1.62' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 502.863596][ T35] audit: type=1400 audit(1613060898.782:8): avc: denied { execmem } for pid=8426 comm="syz-executor963" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 502.880965][ T8427] IPVS: ftp: loaded support on port[0] = 21 [ 721.328696][ T1644] INFO: task kworker/0:0:5 blocked for more than 143 seconds. [ 721.336408][ T1644] Not tainted 5.11.0-rc7-syzkaller #0 [ 721.345169][ T1644] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 721.355022][ T1644] task:kworker/0:0 state:D stack:27512 pid: 5 ppid: 2 flags:0x00004000 [ 721.365652][ T1644] Workqueue: ipv6_addrconf addrconf_verify_work [ 721.373225][ T1644] Call Trace: [ 721.376579][ T1644] __schedule+0x90c/0x21a0 [ 721.382566][ T1644] ? io_schedule_timeout+0x140/0x140 [ 721.387888][ T1644] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.396151][ T1644] ? lockdep_hardirqs_on+0x79/0x100 [ 721.402429][ T1644] schedule+0xcf/0x270 [ 721.406532][ T1644] schedule_preempt_disabled+0xf/0x20 [ 721.413400][ T1644] __mutex_lock+0x81a/0x1110 [ 721.418024][ T1644] ? addrconf_verify_work+0xa/0x20 [ 721.424598][ T1644] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.431015][ T1644] ? lock_release+0x710/0x710 [ 721.435810][ T1644] ? lock_downgrade+0x6d0/0x6d0 [ 721.442137][ T1644] addrconf_verify_work+0xa/0x20 [ 721.447104][ T1644] process_one_work+0x98d/0x15f0 [ 721.454646][ T1644] ? pwq_dec_nr_in_flight+0x320/0x320 [ 721.460963][ T1644] ? rwlock_bug.part.0+0x90/0x90 [ 721.465946][ T1644] ? _raw_spin_lock_irq+0x41/0x50 [ 721.472567][ T1644] worker_thread+0x64c/0x1120 [ 721.477287][ T1644] ? process_one_work+0x15f0/0x15f0 [ 721.483895][ T1644] kthread+0x3b1/0x4a0 [ 721.487996][ T1644] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.495313][ T1644] ret_from_fork+0x1f/0x30 [ 721.500910][ T1644] [ 721.500910][ T1644] Showing all locks held in the system: [ 721.510771][ T1644] 3 locks held by kworker/0:0/5: [ 721.515720][ T1644] #0: ffff888147acd538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 721.529494][ T1644] #1: ffffc90000cbfda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 721.541389][ T1644] #2: ffffffff8d45c2e8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 721.551831][ T1644] 1 lock held by khungtaskd/1644: [ 721.556865][ T1644] #0: ffffffff8bd73da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 721.568170][ T1644] 1 lock held by in:imklog/8148: [ 721.574595][ T1644] #0: ffff88802380c5f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.584736][ T1644] 2 locks held by syz-executor963/8448: [ 721.591246][ T1644] [ 721.593588][ T1644] ============================================= [ 721.593588][ T1644] [ 721.603611][ T1644] NMI backtrace for cpu 0 [ 721.607951][ T1644] CPU: 0 PID: 1644 Comm: khungtaskd Not tainted 5.11.0-rc7-syzkaller #0 [ 721.616287][ T1644] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.626345][ T1644] Call Trace: [ 721.629629][ T1644] dump_stack+0x107/0x163 [ 721.634040][ T1644] nmi_cpu_backtrace.cold+0x44/0xd7 [ 721.639256][ T1644] ? lapic_can_unplug_cpu+0x80/0x80 [ 721.644534][ T1644] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 721.650596][ T1644] watchdog+0xd43/0xfa0 [ 721.654803][ T1644] ? reset_hung_task_detector+0x30/0x30 [ 721.660364][ T1644] kthread+0x3b1/0x4a0 [ 721.664440][ T1644] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.670348][ T1644] ret_from_fork+0x1f/0x30 [ 721.674968][ T1644] Sending NMI from CPU 0 to CPUs 1: [ 721.681735][ C1] NMI backtrace for cpu 1 [ 721.681744][ C1] CPU: 1 PID: 8448 Comm: syz-executor963 Not tainted 5.11.0-rc7-syzkaller #0 [ 721.681753][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.681767][ C1] RIP: 0010:lock_is_held_type+0xdf/0x120 [ 721.681778][ C1] Code: 0f b6 47 22 45 31 ed 83 e0 03 44 39 f0 41 0f 94 c5 48 c7 c7 a0 a9 4b 89 e8 0e 0d 00 00 b8 ff ff ff ff 65 0f c1 05 41 6d 06 77 <83> f8 01 75 1b ff 34 24 9d 48 83 c4 08 44 89 e8 5b 5d 41 5c 41 5d [ 721.681793][ C1] RSP: 0018:ffffc90001946b70 EFLAGS: 00000057 [ 721.681805][ C1] RAX: 0000000000000001 RBX: 0000000000000002 RCX: 0000000000000001 [ 721.681813][ C1] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 [ 721.681822][ C1] RBP: ffffffff8bd73ce0 R08: 0000000000000000 R09: ffffffff8da3ba4f [ 721.681831][ C1] R10: fffffbfff1b47749 R11: 0000000000000000 R12: ffff8880135e4100 [ 721.681840][ C1] R13: 0000000000000000 R14: 00000000ffffffff R15: ffff8880135e4ab0 [ 721.681849][ C1] FS: 000000000151e300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 721.681858][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 721.681865][ C1] CR2: 00007f7b354776c0 CR3: 000000001e92d000 CR4: 00000000001506e0 [ 721.681874][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 721.681882][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 721.681889][ C1] Call Trace: [ 721.681893][ C1] rcu_read_lock_sched_held+0x3a/0x70 [ 721.681899][ C1] lock_release+0x5b7/0x710 [ 721.681904][ C1] ? tcf_idr_check_alloc+0x29e/0x3b0 [ 721.681910][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 721.681915][ C1] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 721.681922][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.681928][ C1] ? lockdep_hardirqs_on+0x79/0x100 [ 721.681934][ C1] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 721.681940][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.681946][ C1] __mutex_unlock_slowpath+0x81/0x610 [ 721.681952][ C1] ? __radix_tree_lookup+0x1a9/0x2a0 [ 721.681958][ C1] ? wait_for_completion_io+0x260/0x260 [ 721.681964][ C1] ? __radix_tree_lookup+0x211/0x2a0 [ 721.681970][ C1] tcf_idr_check_alloc+0x29e/0x3b0 [ 721.681976][ C1] tcf_police_init+0x34f/0x1460 [ 721.681981][ C1] ? tcf_police_cleanup+0x60/0x60 [ 721.681987][ C1] ? find_held_lock+0x2d/0x110 [ 721.681992][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 721.681997][ C1] ? mark_held_locks+0x9f/0xe0 [ 721.682003][ C1] tcf_action_init_1+0x1a3/0x990 [ 721.682008][ C1] ? tcf_action_dump_old+0x80/0x80 [ 721.682014][ C1] ? kasan_save_stack+0x32/0x40 [ 721.682019][ C1] ? kasan_save_stack+0x1b/0x40 [ 721.682025][ C1] ? ____kasan_kmalloc.constprop.0+0x7f/0xa0 [ 721.682031][ C1] ? kmem_cache_alloc_trace+0x1e0/0x400 [ 721.682037][ C1] ? fw_change+0x4b5/0x13e0 [ 721.682042][ C1] ? tc_new_tfilter+0x1394/0x2120 [ 721.682048][ C1] ? rtnetlink_rcv_msg+0x80e/0xad0 [ 721.682054][ C1] ? netlink_rcv_skb+0x153/0x420 [ 721.682059][ C1] ? netlink_unicast+0x533/0x7d0 [ 721.682065][ C1] ? netlink_sendmsg+0x856/0xd90 [ 721.682070][ C1] ? sock_sendmsg+0xcf/0x120 [ 721.682075][ C1] ? ____sys_sendmsg+0x331/0x810 [ 721.682081][ C1] ? ___sys_sendmsg+0xf3/0x170 [ 721.682086][ C1] ? __sys_sendmmsg+0x195/0x470 [ 721.682091][ C1] ? __x64_sys_sendmmsg+0x99/0x100 [ 721.682097][ C1] ? do_syscall_64+0x2d/0x70 [ 721.682102][ C1] ? mark_lock+0xf7/0x1720 [ 721.682107][ C1] tcf_exts_validate+0x138/0x420 [ 721.682113][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 721.682118][ C1] ? find_held_lock+0x2d/0x110 [ 721.682123][ C1] fw_set_parms+0x13d/0xaa0 [ 721.682128][ C1] ? fw_delete+0x8c0/0x8c0 [ 721.682134][ C1] ? rcu_read_lock_sched_held+0x3a/0x70 [ 721.682140][ C1] ? trace_kmalloc+0xbe/0xf0 [ 721.682145][ C1] ? kmem_cache_alloc_trace+0x1f9/0x400 [ 721.682152][ C1] fw_change+0x57e/0x13e0 [ 721.682157][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 721.682162][ C1] ? fw_set_parms+0xaa0/0xaa0 [ 721.682168][ C1] ? tc_new_tfilter+0x132a/0x2120 [ 721.682174][ C1] tc_new_tfilter+0x1394/0x2120 [ 721.682179][ C1] ? fw_set_parms+0xaa0/0xaa0 [ 721.682184][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 721.682190][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 721.682195][ C1] rtnetlink_rcv_msg+0x80e/0xad0 [ 721.682201][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 721.682207][ C1] netlink_rcv_skb+0x153/0x420 [ 721.682213][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 721.682219][ C1] ? netlink_ack+0xaa0/0xaa0 [ 721.682224][ C1] ? netlink_deliver_tap+0x227/0xb70 [ 721.682230][ C1] netlink_unicast+0x533/0x7d0 [ 721.682236][ C1] ? netlink_attachskb+0x870/0x870 [ 721.682242][ C1] ? _copy_from_iter_full+0x275/0x850 [ 721.682251][ C1] netlink_sendmsg+0x856/0xd90 [ 721.682255][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 721.682260][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.682267][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 721.682271][ C1] sock_sendmsg+0xcf/0x120 [ 721.682276][ C1] ____sys_sendmsg+0x331/0x810 [ 721.682280][ C1] ? kernel_sendmsg+0x50/0x50 [ 721.682285][ C1] ? do_recvmmsg+0x6c0/0x6c0 [ 721.682290][ C1] ? __lock_acquire+0x16c2/0x54f0 [ 721.682294][ C1] ___sys_sendmsg+0xf3/0x170 [ 721.682299][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 721.682304][ C1] ? find_held_lock+0x2d/0x110 [ 721.682309][ C1] ? __might_fault+0xd3/0x180 [ 721.682313][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 721.682318][ C1] __sys_sendmmsg+0x195/0x470 [ 721.682322][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 721.682328][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.682333][ C1] ? sockfd_lookup_light+0xc5/0x180 [ 721.682338][ C1] ? __sys_sendmsg+0x10c/0x1b0 [ 721.682343][ C1] ? __sys_sendmsg_sock+0xb0/0xb0 [ 721.682348][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.682354][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 721.682359][ C1] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.682364][ C1] do_syscall_64+0x2d/0x70 [ 721.682369][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.682374][ C1] RIP: 0033:0x4400a9 [ 721.682383][ C1] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 721.682397][ C1] RSP: 002b:00007ffc4f7b68c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 721.682408][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004400a9 [ 721.682416][ C1] RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003 [ 721.682423][ C1] RBP: 0000000000000000 R08: 00000000004ab000 R09: 00000000004ab000 [ 721.682431][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc4f7b6900 [ 721.682438][ C1] R13: 00007ffc4f7b68f0 R14: 00007ffc4f7b68e0 R15: 0000000000400488 [ 721.682446][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.457 msecs [ 721.708611][ T1644] Kernel panic - not syncing: hung_task: blocked tasks [ 722.348722][ T1644] CPU: 0 PID: 1644 Comm: khungtaskd Not tainted 5.11.0-rc7-syzkaller #0 [ 722.357072][ T1644] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 722.367141][ T1644] Call Trace: [ 722.370434][ T1644] dump_stack+0x107/0x163 [ 722.374799][ T1644] panic+0x306/0x73d [ 722.378721][ T1644] ? __warn_printk+0xf3/0xf3 [ 722.383342][ T1644] ? lapic_can_unplug_cpu+0x80/0x80 [ 722.388562][ T1644] ? preempt_schedule_thunk+0x16/0x18 [ 722.393956][ T1644] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 722.400132][ T1644] ? watchdog.cold+0x5/0x158 [ 722.404782][ T1644] watchdog.cold+0x16/0x158 [ 722.409311][ T1644] ? reset_hung_task_detector+0x30/0x30 [ 722.414879][ T1644] kthread+0x3b1/0x4a0 [ 722.418982][ T1644] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 722.424892][ T1644] ret_from_fork+0x1f/0x30 [ 722.430167][ T1644] Kernel Offset: disabled [ 722.434557][ T1644] Rebooting in 86400 seconds..