INFO: task syz.0.309:5318 blocked for more than 430 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.309       state:D stack:0     pid:5318  tgid:5316  ppid:3223   task_flags:0x400140 flags:0x00000002
Call Trace:
[<ffffffff8652c3f0>] context_switch kernel/sched/core.c:5510 [inline]
[<ffffffff8652c3f0>] __schedule+0x1de4/0x4ff4 kernel/sched/core.c:7234
[<ffffffff8652f6ae>] __schedule_loop kernel/sched/core.c:7311 [inline]
[<ffffffff8652f6ae>] schedule+0xae/0x260 kernel/sched/core.c:7326
[<ffffffff80ff6f26>] do_uevent+0x432/0x5d4 fs/dlm/lockspace.c:206
[<ffffffff80ff86d8>] new_lockspace fs/dlm/lockspace.c:583 [inline]
[<ffffffff80ff86d8>] __dlm_new_lockspace+0x157c/0x1f9e fs/dlm/lockspace.c:638
[<ffffffff80ff9830>] dlm_new_user_lockspace+0x62/0x8c fs/dlm/lockspace.c:671
[<ffffffff810336f2>] device_create_lockspace fs/dlm/user.c:414 [inline]
[<ffffffff810336f2>] device_write+0x868/0x1a40 fs/dlm/user.c:606
[<ffffffff80ce7d36>] vfs_write+0x308/0x1020 fs/read_write.c:685
[<ffffffff80ce8e58>] ksys_write+0x126/0x244 fs/read_write.c:739
[<ffffffff80ce8fe4>] __do_sys_write fs/read_write.c:750 [inline]
[<ffffffff80ce8fe4>] __se_sys_write fs/read_write.c:747 [inline]
[<ffffffff80ce8fe4>] __riscv_sys_write+0x6e/0xa0 fs/read_write.c:747
[<ffffffff80078f30>] syscall_handler+0x92/0x114 arch/riscv/include/asm/syscall.h:112
[<ffffffff8651fb84>] do_trap_ecall_u+0x3e4/0x636 arch/riscv/kernel/traps.c:345
[<ffffffff8654beb0>] handle_exception+0x168/0x174 arch/riscv/kernel/entry.S:237
INFO: task syz.0.309:5321 blocked for more than 430 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.309       state:D stack:0     pid:5321  tgid:5316  ppid:3223   task_flags:0x400140 flags:0x00000002
Call Trace:
[<ffffffff8652c3f0>] context_switch kernel/sched/core.c:5510 [inline]
[<ffffffff8652c3f0>] __schedule+0x1de4/0x4ff4 kernel/sched/core.c:7234
[<ffffffff8652f6ae>] __schedule_loop kernel/sched/core.c:7311 [inline]
[<ffffffff8652f6ae>] schedule+0xae/0x260 kernel/sched/core.c:7326
[<ffffffff8652f962>] schedule_preempt_disabled+0x16/0x28 kernel/sched/core.c:7383
[<ffffffff86537ace>] __mutex_lock_common kernel/locking/mutex.c:726 [inline]
[<ffffffff86537ace>] __mutex_lock+0xb92/0x192e kernel/locking/mutex.c:821
[<ffffffff8653887e>] mutex_lock_nested+0x14/0x1c kernel/locking/mutex.c:874
[<ffffffff80ff9972>] dlm_release_lockspace+0x118/0xdce fs/dlm/lockspace.c:808
[<ffffffff810337d4>] device_remove_lockspace fs/dlm/user.c:461 [inline]
[<ffffffff810337d4>] device_write+0x94a/0x1a40 fs/dlm/user.c:614
[<ffffffff80ce7d36>] vfs_write+0x308/0x1020 fs/read_write.c:685
[<ffffffff80ce8e58>] ksys_write+0x126/0x244 fs/read_write.c:739
[<ffffffff80ce8fe4>] __do_sys_write fs/read_write.c:750 [inline]
[<ffffffff80ce8fe4>] __se_sys_write fs/read_write.c:747 [inline]
[<ffffffff80ce8fe4>] __riscv_sys_write+0x6e/0xa0 fs/read_write.c:747
[<ffffffff80078f30>] syscall_handler+0x92/0x114 arch/riscv/include/asm/syscall.h:112
[<ffffffff8651fb84>] do_trap_ecall_u+0x3e4/0x636 arch/riscv/kernel/traps.c:345
[<ffffffff8654beb0>] handle_exception+0x168/0x174 arch/riscv/kernel/entry.S:237

Showing all locks held in the system:
1 lock held by khungtaskd/32:
 #0: ffffffff889f4020 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #0: ffffffff889f4020 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3e/0x1a0 kernel/locking/lockdep.c:6775
2 locks held by kworker/u8:8/990:
 #0: ffffaf801211c140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1068/0x20a0 kernel/workqueue.c:3297
 #1: ffff8f8002107b50 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x826/0x20a0 kernel/workqueue.c:3298
1 lock held by klogd/3035:
2 locks held by getty/3188:
 #0: ffffaf8012fac0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3a/0x46 drivers/tty/tty_ldsem.c:340
 #1: ffff8f800008e2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x3be/0x12fc drivers/tty/n_tty.c:2211
2 locks held by syz-executor/3216:
2 locks held by kworker/0:3/3219:
4 locks held by kworker/1:6/3933:
4 locks held by kworker/u8:5/4665:
 #0: ffffaf80126c8940 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x1068/0x20a0 kernel/workqueue.c:3297
 #1: ffff8f800bf27b50 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x826/0x20a0 kernel/workqueue.c:3298
 #2: ffffffff8a041860 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x22/0x2a net/core/rtnetlink.c:80
 #3: ffffaf803403c530 (&idev->mc_lock){+.+.}-{4:4}, at: __ipv6_dev_mc_inc+0x4c/0xdae net/ipv6/mcast.c:943
1 lock held by syz.0.309/5318:
 #0: ffffffff916f0bc0 (&ls_lock){+.+.}-{4:4}, at: __dlm_new_lockspace+0xbe/0x1f9e fs/dlm/lockspace.c:632
1 lock held by syz.0.309/5321:
 #0: ffffffff916f0bc0 (&ls_lock){+.+.}-{4:4}, at: dlm_release_lockspace+0x118/0xdce fs/dlm/lockspace.c:808
1 lock held by dlm_recoverd/5322:
 #0: ffffaf8032008a18 (&ls->ls_in_recovery){+.+.}-{4:4}, at: dlm_recoverd+0xc6/0x24a8 fs/dlm/recoverd.c:400
2 locks held by syz-executor/5356:
3 locks held by kworker/u8:3/5388:
3 locks held by kworker/u8:6/5402:
4 locks held by kworker/u8:0/5831:
1 lock held by cmp/5842:
3 locks held by modprobe/5843:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 32 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff8007c6e4>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:149
[<ffffffff80003112>] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:155
[<ffffffff80060ea4>] __dump_stack lib/dump_stack.c:94 [inline]
[<ffffffff80060ea4>] dump_stack_lvl+0x114/0x1aa lib/dump_stack.c:120
[<ffffffff80060f56>] dump_stack+0x1c/0x24 lib/dump_stack.c:129
[<ffffffff864dff34>] nmi_cpu_backtrace+0x25e/0x3ae lib/nmi_backtrace.c:122
[<ffffffff864e0330>] nmi_trigger_cpumask_backtrace+0x2ac/0x4ee lib/nmi_backtrace.c:65
[<ffffffff8008a6e6>] arch_trigger_cpumask_backtrace+0x2c/0x3e arch/riscv/kernel/smp.c:349
[<ffffffff864f489e>] trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
[<ffffffff864f489e>] __sys_info lib/sys_info.c:157 [inline]
[<ffffffff864f489e>] sys_info+0x20c/0x252 lib/sys_info.c:165
[<ffffffff8052fe98>] check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
[<ffffffff8052fe98>] watchdog+0xa26/0x1282 kernel/hung_task.c:561
[<ffffffff801f3914>] kthread+0x312/0x438 kernel/kthread.c:436
[<ffffffff8006a1ee>] ret_from_fork_kernel+0x94/0xef6 arch/riscv/kernel/process.c:230
[<ffffffff8654bfea>] ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:368
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5315 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
Workqueue: events_unbound nsim_dev_trap_report_work
epc : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
epc : _raw_spin_unlock_irqrestore+0x36/0xc0 kernel/locking/spinlock.c:198
 ra : __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline]
 ra : _raw_spin_unlock_irqrestore+0x7c/0xc0 kernel/locking/spinlock.c:198
epc : ffffffff86547c4e ra : ffffffff86547c94 sp : ffff8f80031d75c0
 gp : ffffffff8a4a7c60 tp : ffffaf801d1b0000 t0 : ffff8f80031d77e0
 t1 : ffffffff8007bc8e t2 : 0000000000000edc s0 : ffff8f80031d75e0
 s1 : 0000000000000002 a0 : 0000000000000001 a1 : ffffffff88216318
 a2 : 0000000000000006 a3 : 0000000000000001 a4 : 0000000000001000
 a5 : 0000000000000000 a6 : 0000000000000003 a7 : 0000000041b58ab3
 s2 : ffffffff9175d580 s3 : 0000000000000000 s4 : 0000000000000003
 s5 : dead000000000100 s6 : dfffffff00000000 s7 : ffffaf803aa78000
 s8 : ffffaf803aa78000 s9 : ffffaf803aa78000 s10: 0000000000000000
 s11: ffffaf803aa79000 t3 : ffffffff8809bec8 t4 : fffffffef22ebab0
 t5 : fffffffef22ebab1 t6 : 0000000000000002 ssp : 0000000000000000
status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001
[<ffffffff86547c4e>] arch_local_irq_restore arch/riscv/include/asm/irqflags.h:51 [inline]
[<ffffffff86547c4e>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline]
[<ffffffff86547c4e>] _raw_spin_unlock_irqrestore+0x36/0xc0 kernel/locking/spinlock.c:198
[<ffffffff8191a730>] __debug_check_no_obj_freed lib/debugobjects.c:1180 [inline]
[<ffffffff8191a730>] debug_check_no_obj_freed+0x276/0x578 lib/debugobjects.c:1201
[<ffffffff80b257b4>] slab_free_hook mm/slub.c:2608 [inline]
[<ffffffff80b257b4>] slab_free mm/slub.c:6377 [inline]
[<ffffffff80b257b4>] kfree+0x486/0x76c mm/slub.c:6692
[<ffffffff85218d2c>] skb_kfree_head net/core/skbuff.c:1083 [inline]
[<ffffffff85218d2c>] skb_free_head+0x1cc/0x234 net/core/skbuff.c:1095
[<ffffffff852264c6>] skb_release_data+0x5d4/0x786 net/core/skbuff.c:1122
[<ffffffff852335c8>] skb_release_all net/core/skbuff.c:1197 [inline]
[<ffffffff852335c8>] __kfree_skb net/core/skbuff.c:1211 [inline]
[<ffffffff852335c8>] consume_skb net/core/skbuff.c:1445 [inline]
[<ffffffff852335c8>] consume_skb+0xca/0x126 net/core/skbuff.c:1439
[<ffffffff838160fa>] nsim_dev_trap_report drivers/net/netdevsim/dev.c:892 [inline]
[<ffffffff838160fa>] nsim_dev_trap_report_work+0x7d4/0xbe8 drivers/net/netdevsim/dev.c:922
[<ffffffff801d06ee>] process_one_work+0x90a/0x20a0 kernel/workqueue.c:3322
[<ffffffff801d3d24>] process_scheduled_works kernel/workqueue.c:3405 [inline]
[<ffffffff801d3d24>] worker_thread+0x532/0xcaa kernel/workqueue.c:3486
[<ffffffff801f3914>] kthread+0x312/0x438 kernel/kthread.c:436
[<ffffffff8006a1ee>] ret_from_fork_kernel+0x94/0xef6 arch/riscv/kernel/process.c:230
[<ffffffff8654bfea>] ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:368