INFO: task syz.1.39:4314 blocked for more than 430 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.39        state:D stack:0     pid:4314  tgid:4311  ppid:3205   task_flags:0x400040 flags:0x00000002
Call Trace:
[<ffffffff8666de56>] context_switch kernel/sched/core.c:5256 [inline]
[<ffffffff8666de56>] __schedule+0x102c/0x451e kernel/sched/core.c:6863
[<ffffffff8667140c>] __schedule_loop kernel/sched/core.c:6945 [inline]
[<ffffffff8667140c>] schedule+0xc4/0x35e kernel/sched/core.c:6960
[<ffffffff866717a0>] schedule_preempt_disabled+0x16/0x28 kernel/sched/core.c:7017
[<ffffffff86679696>] __mutex_lock_common kernel/locking/mutex.c:692 [inline]
[<ffffffff86679696>] __mutex_lock+0x8aa/0x19b4 kernel/locking/mutex.c:776
[<ffffffff8667a7b4>] mutex_lock_nested+0x14/0x1c kernel/locking/mutex.c:828
[<ffffffff862d2584>] smc_switch_to_fallback+0x3e/0xa9c net/smc/af_smc.c:921
[<ffffffff862d312e>] smc_sendmsg+0x14c/0xd12 net/smc/af_smc.c:2797
[<ffffffff852cd948>] sock_sendmsg_nosec net/socket.c:727 [inline]
[<ffffffff852cd948>] __sock_sendmsg+0xcc/0x162 net/socket.c:742
[<ffffffff852ce5fe>] ____sys_sendmsg+0x640/0x79e net/socket.c:2592
[<ffffffff852d825e>] ___sys_sendmsg+0x144/0x1e6 net/socket.c:2646
[<ffffffff852d9354>] __sys_sendmsg+0x188/0x246 net/socket.c:2678
[<ffffffff852d9482>] __do_sys_sendmsg net/socket.c:2683 [inline]
[<ffffffff852d9482>] __se_sys_sendmsg net/socket.c:2681 [inline]
[<ffffffff852d9482>] __riscv_sys_sendmsg+0x70/0xa2 net/socket.c:2681
[<ffffffff800789d8>] syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:112
[<ffffffff86662f6e>] do_trap_ecall_u+0x3d8/0x56c arch/riscv/kernel/traps.c:343
[<ffffffff8668cf0e>] handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:198

Showing all locks held in the system:
3 locks held by kworker/u8:2/27:
1 lock held by khungtaskd/33:
 #0: ffffffff889e1320 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2a/0x1a0 kernel/locking/lockdep.c:6771
2 locks held by kworker/u8:7/1976:
 #0: ffffaf8012289148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x848/0x1f3a kernel/workqueue.c:3232
 #1: ffff8f8002c97b70 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1f3a kernel/workqueue.c:3232
2 locks held by getty/3169:
 #0: ffffaf801dcc50a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3a/0x46 drivers/tty/tty_ldsem.c:340
 #1: ffff8f800008e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x3e4/0x12ea drivers/tty/n_tty.c:2211
2 locks held by syz-executor/3193:
3 locks held by kworker/u8:3/3210:
6 locks held by kworker/u8:8/3988:
1 lock held by syz.1.39/4312:
2 locks held by syz.1.39/4314:
 #0: ffffaf801c740260 (sk_lock-AF_SMC){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1700 [inline]
 #0: ffffaf801c740260 (sk_lock-AF_SMC){+.+.}-{0:0}, at: smc_sendmsg+0x4e/0xd12 net/smc/af_smc.c:2791
 #1: ffffaf801c740ba8 (&smc->clcsock_release_lock){+.+.}-{4:4}, at: smc_switch_to_fallback+0x3e/0xa9c net/smc/af_smc.c:921
3 locks held by kworker/1:0/4352:
2 locks held by kworker/0:4/4439:
1 lock held by syz.2.56/4719:
1 lock held by modprobe/4722:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 33 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff8007b93e>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:149
[<ffffffff80003346>] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:155
[<ffffffff80061ac0>] __dump_stack lib/dump_stack.c:94 [inline]
[<ffffffff80061ac0>] dump_stack_lvl+0x12a/0x1a2 lib/dump_stack.c:120
[<ffffffff80061b54>] dump_stack+0x1c/0x24 lib/dump_stack.c:129
[<ffffffff86623342>] nmi_cpu_backtrace+0x3b0/0x3b2 lib/nmi_backtrace.c:113
[<ffffffff866235fa>] nmi_trigger_cpumask_backtrace+0x2b6/0x45a lib/nmi_backtrace.c:62
[<ffffffff800896e8>] arch_trigger_cpumask_backtrace+0x2c/0x3c arch/riscv/kernel/smp.c:350
[<ffffffff86637fc8>] trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
[<ffffffff86637fc8>] __sys_info lib/sys_info.c:157 [inline]
[<ffffffff86637fc8>] sys_info+0x20c/0x252 lib/sys_info.c:165
[<ffffffff80514a3a>] check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
[<ffffffff80514a3a>] watchdog+0xa70/0x11ec kernel/hung_task.c:515
[<ffffffff801e9d70>] kthread+0x39e/0x7d8 kernel/kthread.c:463
[<ffffffff8006aa1a>] ret_from_fork_kernel+0x2a/0xc78 arch/riscv/kernel/process.c:214
[<ffffffff8668d02e>] ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:328
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 4722 Comm: modprobe Not tainted syzkaller #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
epc : __debug_check_no_obj_freed lib/debugobjects.c:1083 [inline]
epc : debug_check_no_obj_freed+0x27c/0x4fe lib/debugobjects.c:1129
 ra : __debug_check_no_obj_freed lib/debugobjects.c:1108 [inline]
 ra : debug_check_no_obj_freed+0x26a/0x4fe lib/debugobjects.c:1129
epc : ffffffff8187846e ra : ffffffff8187845c sp : ffff8f8003057610
 gp : ffffffff8a2fec60 tp : ffffaf8012369a80 t0 : ffff8f8003057660
 t1 : fffffffef22c5994 t2 : 0000000000000000 s0 : ffff8f80030577a0
 s1 : ffffaf801cbc36e0 a0 : ffffaf8012369a88 a1 : ffffffff8820a170
 a2 : 0000000000000006 a3 : 0000000000000001 a4 : ffffffff8a446f80
 a5 : 0000000000000037 a6 : 0000000000000003 a7 : ffffffff9162cca3
 s2 : 1ffff1f00060aed0 s3 : dead000000000100 s4 : dead000000000122
 s5 : dfffffff00000000 s6 : ffffffff9162cc98 s7 : ffffaf801cbc3690
 s8 : 0000000000000000 s9 : 0000000000000000 s10: ffffaf801cbc36e0
 s11: ffffaf801cbc3000 t3 : fd5228ce00000000 t4 : fffffffef22c5994
 t5 : fffffffef22c5995 t6 : 0000000000000002
status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001
[<ffffffff8187846e>] __debug_check_no_obj_freed lib/debugobjects.c:1111 [inline]
[<ffffffff8187846e>] debug_check_no_obj_freed+0x27c/0x4fe lib/debugobjects.c:1129
[<ffffffff80ad088a>] slab_free_hook mm/slub.c:2471 [inline]
[<ffffffff80ad088a>] slab_free mm/slub.c:6668 [inline]
[<ffffffff80ad088a>] kmem_cache_free+0x2ea/0x882 mm/slub.c:6779
[<ffffffff80a4f052>] anon_vma_chain_free mm/rmap.c:146 [inline]
[<ffffffff80a4f052>] unlink_anon_vmas+0x460/0x6c0 mm/rmap.c:446
[<ffffffff809cc860>] free_pgtables+0x1e4/0x77a mm/memory.c:414
[<ffffffff80a0e652>] exit_mmap+0x39a/0xd04 mm/mmap.c:1288
[<ffffffff8014085a>] __mmput+0x114/0x3d4 kernel/fork.c:1173
[<ffffffff80140b8e>] mmput+0x74/0x88 kernel/fork.c:1196
[<ffffffff80160a96>] exit_mm kernel/exit.c:581 [inline]
[<ffffffff80160a96>] do_exit+0x7d2/0x28fc kernel/exit.c:959
[<ffffffff80163120>] do_group_exit+0xd4/0x26c kernel/exit.c:1112
[<ffffffff80163302>] __do_sys_exit_group kernel/exit.c:1123 [inline]
[<ffffffff80163302>] __se_sys_exit_group kernel/exit.c:1121 [inline]
[<ffffffff80163302>] __riscv_sys_exit_group+0x4a/0x54 kernel/exit.c:1121
[<ffffffff800789d8>] syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:112
[<ffffffff86662f6e>] do_trap_ecall_u+0x3d8/0x56c arch/riscv/kernel/traps.c:343
[<ffffffff8668cf0e>] handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:198