INFO: task syz.3.119:4710 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.119       state:D
 stack:25872 pid: 4710 ppid:  4196 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 do_uevent+0x1df/0x480 fs/dlm/lockspace.c:210
 new_lockspace fs/dlm/lockspace.c:640 [inline]
 dlm_new_lockspace+0x1ca0/0x21a0 fs/dlm/lockspace.c:698
 device_create_lockspace+0xc4/0x350 fs/dlm/user.c:405
 device_write+0x893/0xea0 fs/dlm/user.c:597
 vfs_write+0x304/0xd70 fs/read_write.c:592
 ksys_write+0x153/0x260 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f504eec9159
RSP: 002b:00007f504d121028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f504f150fa0 RCX: 00007f504eec9159
RDX: 0000000000000080 RSI: 0000200000000400 RDI: 0000000000000005
RBP: 00007f504ef6006b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f504f151038 R14: 00007f504f150fa0 R15: 00007ffcf81bc278
 </TASK>

Showing all locks held in the system:
2 locks held by ksoftirqd/0/14:
 #0: ffff8880b903a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x98/0x130 kernel/sched/core.c:483
 #1: ffff8880b9027888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x517/0x810 kernel/sched/psi.c:891
1 lock held by khungtaskd/27:
 #0: ffffffff8c31ef60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
3 locks held by kworker/0:3/2302:
 #0: ffff88814d168138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
 #1: ffffc9000637fd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
 #2: ffffffff8d44d548 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xc4/0x1530 net/ipv6/addrconf.c:4120
1 lock held by dhcpcd/3851:
 #0: ffffffff8d44d548 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d44d548 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x79f/0xf10 net/core/rtnetlink.c:5695
2 locks held by getty/3945:
 #0: ffff88802c0f3098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc900025e62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x594/0x1a50 drivers/tty/n_tty.c:2158
1 lock held by syz.3.119/4710:
 #0: 
ffffffff963cba48 (&ls_lock){+.+.}-{3:3}, at: dlm_new_lockspace+0xab/0x21a0 fs/dlm/lockspace.c:692
1 lock held by dlm_recoverd/4720:
 #0: ffff8880189e0cb8 (&ls->ls_in_recovery){+.+.}-{3:3}, at: dlm_recoverd+0xa9/0x19e0 fs/dlm/recoverd.c:286
1 lock held by syz-executor/5047:
 #0: ffffffff8c3239e8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
 #0: ffffffff8c3239e8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2d1/0x750 kernel/rcu/tree_exp.h:845
2 locks held by kworker/1:18/5613:
 #0: ffff888016c72138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
 #1: ffffc900035afd00 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
2 locks held by kworker/u4:14/6085:
 #0: ffff8880b903a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x98/0x130 kernel/sched/core.c:483
 #1: ffff8880b9027888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x517/0x810 kernel/sched/psi.c:891
2 locks held by dhcpcd/7807:
 #0: ffff88805e338120 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1744 [inline]
 #0: ffff88805e338120 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xd60 net/packet/af_packet.c:3243
 #1: ffffffff8c3239e8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline]
 #1: ffffffff8c3239e8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3a5/0x750 kernel/rcu/tree_exp.h:845

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xe1b/0xe60 kernel/hung_task.c:369
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3540 Comm: syslogd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:asm_exc_int3+0x0/0x40 arch/x86/include/asm/idtentry.h:604
Code: 00 90 90 90 90 90 90 90 90 90 0f 01 ca fc 6a ff e8 e5 05 00 00 48 89 c4 48 89 e7 e8 5a fc e0 ff e9 c5 06 00 00 90 90 90 90 90 <0f> 01 ca fc 6a ff f6 44 24 10 03 75 18 ff 74 24 28 ff 74 24 28 ff
RSP: 0018:ffffc9000e1d7528 EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffff8880b913a340 RCX: d0c106670919ba00
RDX: ffff8880b913b098 RSI: ffffffff8a2b3e80 RDI: ffffffff8a7a48c0
RBP: 1ffff11017227613 R08: dffffc0000000000 R09: 1ffffffff203e218
R10: dffffc0000000000 R11: fffffbfff203e219 R12: 1ffff110172275c1
R13: dffffc0000000000 R14: ffff8880b913ae08 R15: 0000000000000000
FS:  00007f01841e7c80(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055cc3e989078 CR3: 000000007e199000 CR4: 00000000003506e0
DR0: 0000000000000008 DR1: 0000000000000007 DR2: 0000000000000004
DR3: 0000000000000008 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline]
RIP: 0010:sched_core_enabled kernel/sched/sched.h:1168 [inline]
RIP: 0010:rq_lockp kernel/sched/sched.h:1182 [inline]
RIP: 0010:raw_spin_rq_unlock kernel/sched/core.c:519 [inline]
RIP: 0010:raw_spin_rq_unlock_irq kernel/sched/sched.h:1337 [inline]
RIP: 0010:finish_lock_switch+0x11c/0x290 kernel/sched/core.c:4803
Code: 80 3c 28 00 74 08 4c 89 e7 e8 b0 eb 69 00 49 8b 3c 24 48 83 c7 18 be ff ff ff ff e8 8e da 6c 08 85 c0 74 46 4d 85 ff 75 62 cc <06> 01 00 00 48 89 df e8 78 4a 76 08 e8 93 e3 2a 00 fb 5b 41 5c 41
RSP: 0018:ffffc9000e1d7550 EFLAGS: 00000046
 finish_task_switch+0x12f/0x650 kernel/sched/core.c:4921
 context_switch kernel/sched/core.c:5052 [inline]
 __schedule+0x11cb/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0xbd/0x2d0 kernel/time/timer.c:2093
 __skb_wait_for_more_packets+0x3a8/0x590 net/core/datagram.c:122
 __unix_dgram_recvmsg+0x2a0/0xd50 net/unix/af_unix.c:2328
 sock_recvmsg_nosec net/socket.c:969 [inline]
 sock_recvmsg net/socket.c:987 [inline]
 sock_read_iter+0x2c2/0x380 net/socket.c:1068
 call_read_iter include/linux/fs.h:2173 [inline]
 new_sync_read fs/read_write.c:404 [inline]
 vfs_read+0x75e/0xd50 fs/read_write.c:485
 ksys_read+0x153/0x260 fs/read_write.c:623
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f0184337407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffca4940660 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f01841e7c80 RCX: 00007f0184337407
RDX: 00000000000000ff RSI: 0000555de8db9950 RDI: 0000000000000000
RBP: 0000555de8db9910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000555de8db999b
R13: 0000000000000000 R14: 0000555de8db9950 R15: 0000555dd8c2ad98
 </TASK>
bridge0: port 1(bridge_slave_0) hold timer expired
bridge0: port 2(bridge_slave_1) hold timer expired
bridge0: port 3(dummy0) hold timer expired
virtqueue callback for ffff88814741e600 (ffffffff8444ab50)
nf_conntrack: new packet for ffff8880221bc300
virtqueue interrupt with no work for ffff88814741e500
nf_nat: Already setup manip DST for ct ffff8880221bc300 (status bits 0x188)
virtqueue interrupt with no work for ffff88814741e400
nf_nat: Already setup manip SRC for ct ffff8880221bc300 (status bits 0x188)
wireguard: wg2: Handshake for peer 67 ([::1]:20001/0%0) did not complete after 5 seconds, retrying (try 2)
wireguard: wg2: Handshake for peer 68 (127.0.0.1:20002) did not complete after 5 seconds, retrying (try 2)
tipc: TX(): probing for key[1]
nf_conntrack: new packet for ffff8880221bdb00
nf_nat: Already setup manip DST for ct ffff8880221bdb00 (status bits 0x188)
nf_nat: Already setup manip SRC for ct ffff8880221bdb00 (status bits 0x188)