INFO: task syz-executor.3:710 blocked for more than 143 seconds. Not tainted 5.15.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:25552 pid: 710 ppid: 6538 flags:0x00004004 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 ip6mr_sk_done+0x9e/0x2c0 net/ipv6/ip6mr.c:1582 rawv6_close+0x5f/0x80 net/ipv6/raw.c:1198 inet_release+0x16e/0x1f0 net/ipv4/af_inet.c:431 __sock_release net/socket.c:649 [inline] sock_close+0xd8/0x260 net/socket.c:1314 __fput+0x3fe/0x870 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:302 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x41940b RSP: 002b:00007ffe7eafc4d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 000000000041940b RDX: 0000001b2c525a04 RSI: ffffffff8188f3fb RDI: 0000000000000004 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2c524ee0 R10: 0000000000001943 R11: 0000000000000293 R12: 000000000056cb00 R13: 000000000056cb00 R14: 000000000056bf80 R15: 000000000008a0d2 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8c91c180 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 3 locks held by kworker/u4:3/246: 3 locks held by kworker/1:2/2668: #0: ffff888011064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140 #1: ffffc9000b307d20 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272 #2: ffffffff8d95b448 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:251 1 lock held by in:imklog/6229: #0: ffff88801f4b4d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990 3 locks held by kworker/0:4/8171: #0: ffff888147bc3938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x7ca/0x1140 #1: ffffc9001682fd20 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x808/0x1140 kernel/workqueue.c:2272 #2: ffffffff8d95b448 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4590 2 locks held by syz-executor.3/710: #0: ffff88806bdebe10 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:786 [inline] #0: ffff88806bdebe10 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: __sock_release net/socket.c:648 [inline] #0: ffff88806bdebe10 (&sb->s_type->i_mutex_key#13){+.+.}-{3:3}, at: sock_close+0x94/0x260 net/socket.c:1314 #1: ffffffff8d95b448 (rtnl_mutex){+.+.}-{3:3}, at: ip6mr_sk_done+0x9e/0x2c0 net/ipv6/ip6mr.c:1582 1 lock held by syz-executor.3/718: 2 locks held by kworker/1:1/736: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.15.0-rc1-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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 718 Comm: syz-executor.3 Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x0/0x90 kernel/kcov.c:292 Code: 54 f9 08 48 c1 e0 03 48 83 c8 18 48 89 34 01 4c 89 44 f9 18 49 ff c2 4c 89 11 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <4c> 8b 04 24 65 48 8b 14 25 c0 ef 01 00 65 8b 05 d4 73 7f 7e a9 00 RSP: 0018:ffffc90000dc08c0 EFLAGS: 00000046 RAX: ffffffff81a428c6 RBX: 1ffff920001b813c RCX: ffff88801fec9c80 RDX: 0000000080010201 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000dc0b40 R08: ffffffff81a428b6 R09: ffffed10173a64a2 R10: ffffed10173a64a2 R11: 0000000000000000 R12: ffffc90000dc0b40 R13: ffffc90000dc09e6 R14: dffffc0000000000 R15: 0000000000000000 FS: 00007fe6938a6700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2bd0004218 CR3: 000000007b51c000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: perf_prepare_sample+0xd69/0x1770 kernel/events/core.c:7391 __perf_event_output kernel/events/core.c:7461 [inline] perf_event_output_forward+0x176/0x2c0 kernel/events/core.c:7481 __perf_event_overflow+0x1f8/0x380 kernel/events/core.c:9151 perf_swevent_hrtimer+0x3d1/0x530 kernel/events/core.c:10541 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x4cb/0xa60 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x3b3/0x1040 kernel/time/hrtimer.c:1811 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 b2 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:ffffc90002cde540 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff9200059bcb8 RCX: ffff88801feca670 RDX: 0000000000000000 RSI: 0000000000000201 RDI: 0000000000000000 RBP: ffffc90002cde698 R08: dffffc0000000000 R09: fffffbfff1fa2fd1 R10: fffffbfff1fa2fd1 R11: 0000000000000000 R12: 0000000000000246 R13: 1ffff9200059bcb0 R14: ffffc90002cde5c0 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:8833 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+0x37d/0x470 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: 0033:0x4665f9 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:00007fe6938a6188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056c0f0 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000006 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0f0 R13: 00007ffe7eafc46f R14: 00007fe6938a6300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 54 push %rsp 1: f9 stc 2: 08 48 c1 or %cl,-0x3f(%rax) 5: e0 03 loopne 0xa 7: 48 83 c8 18 or $0x18,%rax b: 48 89 34 01 mov %rsi,(%rcx,%rax,1) f: 4c 89 44 f9 18 mov %r8,0x18(%rcx,%rdi,8) 14: 49 ff c2 inc %r10 17: 4c 89 11 mov %r10,(%rcx) 1a: c3 retq 1b: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 22: 00 00 00 25: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) * 2a: 4c 8b 04 24 mov (%rsp),%r8 <-- trapping instruction 2e: 65 48 8b 14 25 c0 ef mov %gs:0x1efc0,%rdx 35: 01 00 37: 65 8b 05 d4 73 7f 7e mov %gs:0x7e7f73d4(%rip),%eax # 0x7e7f7412 3e: a9 .byte 0xa9