INFO: task syz-executor814:8485 blocked for more than 143 seconds. Not tainted 5.11.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor814 state:D stack:26104 pid: 8485 ppid: 8483 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x999/0xe70 kernel/sched/core.c:5078 schedule+0x14b/0x200 kernel/sched/core.c:5157 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5216 __mutex_lock_common+0x124f/0x2f00 kernel/locking/mutex.c:1033 __mutex_lock kernel/locking/mutex.c:1103 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1118 tcf_action_init_1+0x4c2/0xa80 net/sched/act_api.c:988 tcf_action_init+0x12f/0x4d0 net/sched/act_api.c:1063 tcf_action_add net/sched/act_api.c:1476 [inline] tc_ctl_action+0x2c7/0x7d0 net/sched/act_api.c:1530 rtnetlink_rcv_msg+0x887/0xd60 net/core/rtnetlink.c:5553 netlink_rcv_skb+0x190/0x3a0 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x786/0x940 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x9ae/0xd50 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x519/0x800 net/socket.c:2345 ___sys_sendmsg net/socket.c:2399 [inline] __sys_sendmsg+0x2bf/0x370 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x446259 RSP: 002b:00007f4efff53318 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004cb4e8 RCX: 0000000000446259 RDX: 0000000000000000 RSI: 0000000020002980 RDI: 0000000000000003 RBP: 00000000004cb4e0 R08: 0000000000000009 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 6b72616d6e6e6f63 R13: 00007ffdad9cd19f R14: 00007f4efff53400 R15: 0000000000022000 Showing all locks held in the system: 3 locks held by kworker/1:0/19: #0: ffff888022612938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x6f4/0xfc0 kernel/workqueue.c:2248 #1: ffffc90000d97d78 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x733/0xfc0 kernel/workqueue.c:2250 #2: ffffffff8d6eeb88 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4570 1 lock held by khungtaskd/1648: #0: ffffffff8c711740 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 1 lock held by in:imklog/8131: #0: ffff888019740af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:947 1 lock held by syz-executor814/8485: #0: ffffffff8d6eeb88 (rtnl_mutex){+.+.}-{3:3}, at: tcf_action_init_1+0x4c2/0xa80 net/sched/act_api.c:988 2 locks held by syz-executor814/8487: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1648 Comm: khungtaskd Not tainted 5.11.0-rc6-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+0x137/0x1be lib/dump_stack.c:120 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x191/0x2f0 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+0xce9/0xd30 kernel/hung_task.c:294 kthread+0x39a/0x3c0 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: 8487 Comm: syz-executor814 Not tainted 5.11.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:preempt_count_sub+0x0/0x160 kernel/sched/core.c:4755 Code: 25 ff ff ff 48 c7 c1 88 c8 b3 8d 80 e1 07 80 c1 03 38 c1 7c a4 48 c7 c7 88 c8 b3 8d e8 39 49 69 00 eb 96 0f 1f 80 00 00 00 00 <41> 56 53 89 fb 48 c7 c0 80 da f5 8f 48 c1 e8 03 49 be 00 00 00 00 RSP: 0018:ffffc9000112f160 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff894a43b6 RDX: 0000000000000001 RSI: 0000000000000008 RDI: 0000000000000001 RBP: dffffc0000000000 R08: dffffc0000000000 R09: ffffed100442d641 R10: ffffed100442d641 R11: 0000000000000000 R12: ffff88802216b200 R13: 1ffffffff1febb50 R14: 1ffffffff1b67911 R15: 0000000000000000 FS: 00007f4efff32700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0a3715c000 CR3: 00000000197a2000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __mutex_lock_common+0x536/0x2f00 kernel/locking/mutex.c:964 __mutex_lock kernel/locking/mutex.c:1103 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1118 tcf_idr_check_alloc+0xa4/0x380 net/sched/act_api.c:549 tcf_connmark_init+0x165/0x7b0 net/sched/act_connmark.c:124 tcf_action_init_1+0x7e8/0xa80 net/sched/act_api.c:1010 tcf_action_init+0x12f/0x4d0 net/sched/act_api.c:1063 tcf_action_add net/sched/act_api.c:1476 [inline] tc_ctl_action+0x2c7/0x7d0 net/sched/act_api.c:1530 rtnetlink_rcv_msg+0x887/0xd60 net/core/rtnetlink.c:5553 netlink_rcv_skb+0x190/0x3a0 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x786/0x940 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x9ae/0xd50 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x519/0x800 net/socket.c:2345 ___sys_sendmsg net/socket.c:2399 [inline] __sys_sendmsg+0x2bf/0x370 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x446259 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4efff32318 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004cb4f8 RCX: 0000000000446259 RDX: 0000000000000000 RSI: 0000000020002980 RDI: 0000000000000004 RBP: 00000000004cb4f0 R08: 0000000000000050 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 6b72616d6e6e6f63 R13: 00007ffdad9cd19f R14: 00007f4efff32400 R15: 0000000000022000