INFO: task kworker/u4:0:8 blocked for more than 143 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:0 state:D stack:24496 pid: 8 ppid: 2 flags:0x00004000 Workqueue: tc_filter_workqueue tcindex_partial_destroy_work Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x951/0x2290 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5216 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x9e9/0x1240 kernel/locking/mutex.c:1103 tcindex_partial_destroy_work+0x13/0x50 net/sched/cls_tcindex.c:287 process_one_work+0x868/0x15c0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 INFO: task kworker/0:0:8470 blocked for more than 143 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:0 state:D stack:29768 pid: 8470 ppid: 2 flags:0x00004000 Workqueue: ipv6_addrconf addrconf_verify_work Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x951/0x2290 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5216 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x9e9/0x1240 kernel/locking/mutex.c:1103 addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4569 process_one_work+0x868/0x15c0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Showing all locks held in the system: 3 locks held by kworker/u4:0/8: #0: ffff8881418ba938 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8881418ba938 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff8881418ba938 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff8881418ba938 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff8881418ba938 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff8881418ba938 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: process_one_work+0x750/0x15c0 kernel/workqueue.c:2246 #1: ffffc90000cd7da8 ((work_completion)(&(rwork)->work)){+.+.}-{0:0}, at: process_one_work+0x783/0x15c0 kernel/workqueue.c:2250 #2: ffffffff8d9019c8 (rtnl_mutex){+.+.}-{3:3}, at: tcindex_partial_destroy_work+0x13/0x50 net/sched/cls_tcindex.c:287 1 lock held by khungtaskd/1642: #0: ffffffff8ba40120 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x28c kernel/locking/lockdep.c:6254 1 lock held by in:imklog/8168: #0: ffff88801c3500f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:932 3 locks held by kworker/0:0/8470: #0: ffff888147b72138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888147b72138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff888147b72138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888147b72138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff888147b72138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff888147b72138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x750/0x15c0 kernel/workqueue.c:2246 #1: ffffc90001c7fda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x783/0x15c0 kernel/workqueue.c:2250 #2: ffffffff8d9019c8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4569 2 locks held by syz-executor846/8500: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1642 Comm: khungtaskd Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x5c/0x7b lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xe36/0x11f0 kernel/hung_task.c:294 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8500 Comm: syz-executor846 Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:85 [inline] RIP: 0010:lock_acquire kernel/locking/lockdep.c:5440 [inline] RIP: 0010:lock_acquire+0x2c7/0x780 kernel/locking/lockdep.c:5402 Code: 48 c7 c7 a0 c4 8b 89 48 83 c4 20 e8 83 27 ca 07 b8 ff ff ff ff 65 0f c1 05 f6 da a6 7e 83 f8 01 0f 85 5f 03 00 00 ff 34 24 9d 3a fe ff ff 65 ff 05 5d c9 a6 7e 48 8b 05 f6 80 a0 0c e8 c1 1a RSP: 0018:ffffc9000180eaf0 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 1ffff92000301d60 RCX: 0000000000000001 RDX: 1ffff11003db1130 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8fe6f867 R10: fffffbfff1fcdf0c R11: 0000000000000001 R12: 0000000000000000 R13: ffff88801e2c8068 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000001c60880(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000280 CR3: 00000000138e6000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __mutex_lock_common kernel/locking/mutex.c:956 [inline] __mutex_lock+0x134/0x1240 kernel/locking/mutex.c:1103 tcf_idr_check_alloc+0x78/0x3b0 net/sched/act_api.c:549 tcf_police_init+0x1fd/0x13c0 net/sched/act_police.c:81 tcf_action_init_1+0x1b6/0x9d0 net/sched/act_api.c:1013 tcf_exts_validate+0x138/0x420 net/sched/cls_api.c:3046 tcindex_set_parms+0x19c/0x23f0 net/sched/cls_tcindex.c:342 tcindex_change+0x232/0x340 net/sched/cls_tcindex.c:546 tc_new_tfilter+0x135a/0x2050 net/sched/cls_api.c:2127 rtnetlink_rcv_msg+0x8b1/0xb40 net/core/rtnetlink.c:5555 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x907/0xe10 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xd3/0x130 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2336 ___sys_sendmsg+0xf3/0x170 net/socket.c:2390 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2423 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x441719 Code: e8 5c ad 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 0f 83 bb 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffe18abfe88 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441719 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 00007ffe18abfe90 R08: 0000000100000000 R09: 0000000100000000 R10: 0000000100000000 R11: 0000000000000246 R12: 000000000007616d R13: 00000000004025f0 R14: 0000000000000000 R15: 0000000000000000 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.529 msecs