INFO: task syz.7.7026:25016 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.7026      state:D stack:23984 pid:25016 tgid:25015 ppid:23061  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 nfsd_nl_rpc_status_get_dumpit+0xdc/0x1410
 genl_dumpit+0x10b/0x1b0
 netlink_dump+0x722/0xe80
 __netlink_dump_start+0x5cb/0x7e0
 genl_family_rcv_msg_dumpit+0x213/0x310
 genl_rcv_msg+0x5e8/0x7a0
 netlink_rcv_skb+0x232/0x4b0
 genl_rcv+0x28/0x40
 netlink_unicast+0x80f/0x9b0
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0x972/0x9f0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbe0359c799
RSP: 002b:00007fbe043a5028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fbe03815fa0 RCX: 00007fbe0359c799
RDX: 0000000000000800 RSI: 0000200000000180 RDI: 0000000000000006
RBP: 00007fbe03632c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbe03816038 R14: 00007fbe03815fa0 R15: 00007ffe162913a8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e75e5e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5637:
 #0: ffff8881738fd0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900031802f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
4 locks held by kworker/0:9/17118:
 #0: ffff888100692d48 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90007cefc40 ((work_completion)(&(&ssp->srcu_sup->work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffffffff8e7bd6b8 (&ssp->srcu_sup->srcu_gp_mutex){+.+.}-{4:4}, at: process_srcu+0x6e/0x1220
 #3: ffffffff8e764878 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
2 locks held by syz.4.6431/22598:
 #0: ffffffff8fc3c6f0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40
 #1: ffffffff8ea86108 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0x141/0x1670
3 locks held by syz.7.7026/25016:
 #0: ffffffff8fc3c6f0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40
 #1: ffff8881057e56f0 (nlk_cb_mutex-GENERIC){+.+.}-{4:4}, at: __netlink_dump_start+0xfe/0x7e0
 #2: ffffffff8ea86108 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_rpc_status_get_dumpit+0xdc/0x1410
3 locks held by syz.9.8221/28981:
 #0: ffffffff8fc3c6f0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40
 #1: ffff8881175586f0 (nlk_cb_mutex-GENERIC){+.+.}-{4:4}, at: __netlink_dump_start+0xfe/0x7e0
 #2: ffffffff8ea86108 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_rpc_status_get_dumpit+0xdc/0x1410
2 locks held by syz.4.8516/30073:
1 lock held by syz.6.8526/30103:
 #0: ffffffff8e7ceb68 (event_mutex){+.+.}-{4:4}, at: perf_trace_destroy+0x2e/0x150

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30073 Comm: syz.4.8516 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:memcpy_orig+0x19/0x130
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 89 f8 48 83 fa 20 72 7e 40 38 fe 7c 35 48 83 ea 20 48 83 ea 20 4c 8b 06 <4c> 8b 4e 08 4c 8b 56 10 4c 8b 5e 18 48 8d 76 20 4c 89 07 4c 89 4f
RSP: 0018:ffffc9000af5ebf8 EFLAGS: 00000202
RAX: ffff888115441000 RBX: ffff88818636d000 RCX: ffffffff8bad6d79
RDX: 0000000000000f80 RSI: ffff88818636d040 RDI: ffff888115441040
RBP: 0000000000001000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000af5fbd8
R13: dffffc0000000000 R14: ffff888115441000 R15: 1ffff920015ebd98
FS:  00007fc0e7c806c0(0000) GS:ffff88818de5c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe010b8038 CR3: 00000001ad594000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 00000000000000d4 DR2: 00000000000000d4
DR3: 00000000000000d4 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 copy_mc_to_kernel+0x89/0xa0
 dump_user_range+0x31a/0x12d0
 elf_core_dump+0x34c2/0x3ad0
 coredump_write+0x1216/0x1910
 vfs_coredump+0x36a9/0x4280
 get_signal+0x1107/0x1330
 arch_do_signal_or_restart+0xbc/0x830
 irqentry_exit+0x176/0x620
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0xaf
Code: Unable to access opcode bytes at 0x85.
RSP: 002b:0000200000000148 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fc0e7015fa0 RCX: 00007fc0e6d9c799
RDX: 0000200000000200 RSI: 0000200000000140 RDI: 0000000000200000
RBP: 00007fc0e6e32c99 R08: 00002000000003c0 R09: 00002000000003c0
R10: 0000200000000240 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fc0e7016038 R14: 00007fc0e7015fa0 R15: 00007ffdbd5b7588
 </TASK>
