INFO: task syz.0.3249:19738 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.3249      state:D stack:25264 pid:19738 ppid:17997  flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5257 [inline]
 __schedule+0x1089/0x4140 kernel/sched/core.c:6584
 schedule+0xb9/0x180 kernel/sched/core.c:6660
 do_uevent+0x1e9/0x490 fs/dlm/lockspace.c:210
 new_lockspace fs/dlm/lockspace.c:659 [inline]
 __dlm_new_lockspace+0x1d6a/0x22b0 fs/dlm/lockspace.c:719
 gdlm_mount+0x2f8/0x16d0 fs/gfs2/lock_dlm.c:1317
 gfs2_lm_mount+0x4c9/0x6d0 fs/gfs2/ops_fstype.c:1071
 gfs2_fill_super+0x1469/0x2070 fs/gfs2/ops_fstype.c:1206
 get_tree_bdev+0x3e6/0x610 fs/super.c:1377
 gfs2_get_tree+0x4d/0x1e0 fs/gfs2/ops_fstype.c:1328
 vfs_get_tree+0x88/0x270 fs/super.c:1584
 do_new_mount+0x247/0xa50 fs/namespace.c:3104
 do_mount fs/namespace.c:3475 [inline]
 __do_sys_mount fs/namespace.c:3683 [inline]
 __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3660
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe42f7aa24a
RSP: 002b:00007fe430658e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fe430658ee0 RCX: 00007fe42f7aa24a
RDX: 000020000001f680 RSI: 000020000001f6c0 RDI: 00007fe430658ea0
RBP: 000020000001f680 R08: 00007fe430658ee0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000020000001f6c0
R13: 00007fe430658ea0 R14: 000000000001f67b R15: 000020000001f700
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8db2e3f0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xce0 kernel/rcu/tasks.h:543
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8db2ec30 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xce0 kernel/rcu/tasks.h:543
1 lock held by khungtaskd/28:
 #0: ffffffff8db2daa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #0: ffffffff8db2daa0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #0: ffffffff8db2daa0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6669
2 locks held by getty/4030:
 #0: ffff88814d066098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x430/0x1400 drivers/tty/n_tty.c:2198
3 locks held by kworker/u4:20/6131:
5 locks held by kworker/u4:34/12430:
 #0: ffff8880b8d3ad18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x130 kernel/sched/core.c:549
 #1: ffff8880b8d27888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x400/0x740 kernel/sched/psi.c:999
 #2: ffff8880b8d28458 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x123/0x270 kernel/time/timer.c:999
 #3: ffffffff97f6d4b0 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x68/0x4f0 lib/debugobjects.c:747
 #4: ffffffff97ebcdc8 (&obj_hash[i].lock){-.-.}-{2:2}, at: __debug_check_no_obj_freed lib/debugobjects.c:1034 [inline]
 #4: ffffffff97ebcdc8 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_check_no_obj_freed+0x9a/0x520 lib/debugobjects.c:1075
2 locks held by syz.0.3249/19738:
 #0: ffff8880586040e0 (&type->s_umount_key#119/1){+.+.}-{3:3}, at: alloc_super+0x1fb/0x930 fs/super.c:228
 #1: ffffffff97d9f4a8 (&ls_lock){+.+.}-{3:3}, at: __dlm_new_lockspace+0xad/0x22b0 fs/dlm/lockspace.c:713
1 lock held by dlm_recoverd/19773:
 #0: ffff888053a88ca0 (&ls->ls_in_recovery){+.+.}-{3:3}, at: dlm_recoverd+0xa6/0x1df0 fs/dlm/recoverd.c:312

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

NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3e6/0x460 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
 watchdog+0xf0e/0xf50 kernel/hung_task.c:377
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 11542 Comm: kworker/u4:4 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x80 kernel/kcov.c:310
Code: 28 4d 39 ca 77 22 89 ff 89 f6 49 ff c0 4c 89 01 48 c7 44 11 08 03 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 c3 90 <48> 8b 04 24 65 48 8b 15 34 03 80 7e 65 8b 0d 35 03 80 7e 81 e1 00
RSP: 0018:ffffc9000dd17878 EFLAGS: 00000082
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 6ca36420a01b3300
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000008
RBP: ffffc9000dd17a30 R08: ffffc9000dd17aff R09: ffffc9000dd17ac0
R10: dffffc0000000000 R11: fffff52001ba2f60 R12: 0000000000000001
R13: 0000000000000002 R14: 0000000000000200 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005626a9ff4168 CR3: 000000000d88e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 crng_make_state+0x193/0xb00 drivers/char/random.c:328
 _get_random_bytes+0xfc/0x250 drivers/char/random.c:366
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:776 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
 nsim_dev_trap_report_work+0x608/0xa80 drivers/net/netdevsim/dev.c:851
 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>