INFO: task kworker/u4:8:9675 blocked for more than 143 seconds. Not tainted 5.15.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:8 state:D stack:24560 pid: 9675 ppid: 2 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xc8d/0x1270 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425 __mutex_lock_common+0xdff/0x2550 kernel/locking/mutex.c:669 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:743 cangw_pernet_exit+0xe/0x20 net/can/gw.c:1244 ops_exit_list net/core/net_namespace.c:168 [inline] cleanup_net+0x758/0xc50 net/core/net_namespace.c:591 process_one_work+0x853/0x1140 kernel/workqueue.c:2297 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 Showing all locks held in the system: 3 locks held by kworker/1:0/20: #0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140 #1: ffffc90000da7d20 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272 #2: ffffffff8d95bc48 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:251 1 lock held by khungtaskd/27: #0: ffffffff8c91c1c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 3 locks held by kworker/1:3/1265: #0: ffff88802601a538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140 #1: ffffc900053cfd20 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272 #2: ffffffff8d95bc48 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4590 1 lock held by in:imklog/6227: #0: ffff888025879770 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990 3 locks held by kworker/1:4/8312: #0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140 #1: ffffc90016e2fd20 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272 #2: ffffffff8d95bc48 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:74 4 locks held by kworker/u4:8/9675: #0: ffff888016393138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140 #1: ffffc90004a7fd20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272 #2: ffffffff8d94fff0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf0/0xc50 net/core/net_namespace.c:553 #3: ffffffff8d95bc48 (rtnl_mutex){+.+.}-{3:3}, at: cangw_pernet_exit+0xe/0x20 net/can/gw.c:1244 3 locks held by kworker/u4:17/9710: 2 locks held by syz-executor.3/10919: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc54/0xca0 kernel/hung_task.c:295 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 10919 Comm: syz-executor.3 Not tainted 5.15.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_preemption_disabled+0x37/0x190 lib/smp_processor_id.c:16 Code: 10 49 89 f6 49 89 ff 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 0f 1f 44 00 00 65 8b 1d d2 ab 08 76 65 8b 2d 43 06 09 76 89 ee <81> e6 ff ff ff 7f 31 ff 0f 1f 44 00 00 81 e5 ff ff ff 7f 74 2a 0f RSP: 0018:ffffc90000007bb8 EFLAGS: 00000086 RAX: d28f05cbfb917900 RBX: 0000000000000000 RCX: 0000000080010203 RDX: 0000000000000000 RSI: 0000000080010202 RDI: ffffffff8ab42140 RBP: 0000000080010202 R08: dffffc0000000000 R09: ffffed10173864a2 R10: ffffed10173864a2 R11: 0000000000000000 R12: 0000000000000046 R13: 1ffff92000000f88 R14: ffffffff8a4efaa0 R15: ffffffff8ab42140 FS: 00007f022fc43700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f590a51c008 CR3: 0000000070bad000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lockdep_recursion_inc kernel/locking/lockdep.c:433 [inline] lock_acquire+0x164/0x4d0 kernel/locking/lockdep.c:5624 seqcount_lockdep_reader_access+0xfe/0x230 include/linux/seqlock.h:103 timekeeping_get_delta kernel/time/timekeeping.c:252 [inline] timekeeping_get_ns kernel/time/timekeeping.c:386 [inline] ktime_get_update_offsets_now+0xb5/0x460 kernel/time/timekeeping.c:2300 hrtimer_update_base kernel/time/hrtimer.c:631 [inline] hrtimer_interrupt+0x143/0x1040 kernel/time/hrtimer.c:1793 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 RIP: 0010:lock_acquire+0x21f/0x4d0 kernel/locking/lockdep.c:5629 Code: 08 4c 89 f7 e8 62 d3 69 00 f6 84 24 81 00 00 00 02 0f 85 13 02 00 00 41 f7 c4 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 04 2f 00 00 00 00 43 c7 44 2f 09 00 00 00 00 43 c7 44 2f 11 RSP: 0018:ffffc90007ec6560 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff92000fd8cbc RCX: ffff88807cb709f0 RDX: 0000000000000000 RSI: 0000000000000201 RDI: 0000000000000000 RBP: ffffc90007ec66b8 R08: dffffc0000000000 R09: fffffbfff1fa31d1 R10: fffffbfff1fa31d1 R11: 0000000000000000 R12: 0000000000000246 R13: 1ffff92000fd8cb4 R14: ffffc90007ec65e0 R15: dffffc0000000000 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:363 [inline] nf_conntrack_lock net/netfilter/nf_conntrack_core.c:87 [inline] get_next_corpse net/netfilter/nf_conntrack_core.c:2230 [inline] nf_ct_iterate_cleanup+0xf8/0x3f0 net/netfilter/nf_conntrack_core.c:2275 nf_ct_iterate_cleanup_net+0x172/0x1e0 net/netfilter/nf_conntrack_core.c:2363 masq_device_event+0x9b/0xd0 net/netfilter/nf_nat_masquerade.c:88 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:391 __dev_notify_flags+0x306/0x5e0 dev_change_flags+0xe3/0x190 net/core/dev.c:8837 do_setlink+0xe12/0x4300 net/core/rtnetlink.c:2719 rtnl_group_changelink net/core/rtnetlink.c:3242 [inline] __rtnl_newlink net/core/rtnetlink.c:3396 [inline] rtnl_newlink+0x1155/0x1d10 net/core/rtnetlink.c:3506 rtnetlink_rcv_msg+0x934/0xe60 net/core/rtnetlink.c:5572 netlink_rcv_skb+0x200/0x470 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x814/0x9f0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0xa29/0xe50 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] ____sys_sendmsg+0x5b9/0x910 net/socket.c:2409 ___sys_sendmsg net/socket.c:2463 [inline] __sys_sendmsg+0x36f/0x450 net/socket.c:2492 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f02326cc709 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f022fc43188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f02327d0f60 RCX: 00007f02326cc709 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000006 RBP: 00007f0232726cb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd9ac6329f R14: 00007f022fc43300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 10 49 89 adc %cl,-0x77(%rcx) 3: f6 49 89 ff testb $0xff,-0x77(%rcx) 7: 65 48 8b 04 25 28 00 mov %gs:0x28,%rax e: 00 00 10: 48 89 44 24 08 mov %rax,0x8(%rsp) 15: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 1a: 65 8b 1d d2 ab 08 76 mov %gs:0x7608abd2(%rip),%ebx # 0x7608abf3 21: 65 8b 2d 43 06 09 76 mov %gs:0x76090643(%rip),%ebp # 0x7609066b 28: 89 ee mov %ebp,%esi * 2a: 81 e6 ff ff ff 7f and $0x7fffffff,%esi <-- trapping instruction 30: 31 ff xor %edi,%edi 32: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 37: 81 e5 ff ff ff 7f and $0x7fffffff,%ebp 3d: 74 2a je 0x69 3f: 0f .byte 0xf