INFO: task syz.5.4279:16948 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.4279      state:D stack:27432 pid:16948 tgid:16946 ppid:9878   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d4/0x5820
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7c1/0x1550
 write_threads+0x3b1/0x610
 nfsctl_transaction_write+0x10f/0x160
 vfs_write+0x296/0xba0
 ksys_write+0x150/0x270
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd40619e159
RSP: 002b:00007fd40707c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd406426090 RCX: 00007fd40619e159
RDX: 0000000000000002 RSI: 0000200000000700 RDI: 0000000000000005
RBP: 00007fd40623506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd406426128 R14: 00007fd406426090 R15: 00007ffc365ead18
 </TASK>

Showing all locks held in the system:
locks held by khungtaskd/35: 1, last CPU#1:
 #0: ffffffff8ed5c6a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
locks held by kworker/0:3/2056: 3, on CPU#0:
 #0: ffff888105ed9940 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90008017c40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffff88810a2871d8 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4d30
locks held by klogd/5051: 1, last CPU#0:
 #0: ffffffff8ee8f5e0 (fs_reclaim){+.+.}-{0:0}, at: unwind_next_frame+0x8f/0x2550
locks held by getty/11673: 2, last CPU#1:
 #0: ffff888171e630a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffff888171e63128 (&tty->atomic_write_lock){+.+.}-{4:4}, at: file_tty_write+0x1e2/0x9f0
locks held by syz.5.4279/16947: 3, on CPU#0:
 #0: ffff888115600cf0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320
 #1: ffff888109730460 (sb_writers#21){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #2: ffffffff8f09ba20 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10
locks held by syz.5.4279/16948: 3, on CPU#1:
 #0: ffff88816a134ef0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320
 #1: ffff888109730460 (sb_writers#21){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #2: ffffffff8f09ba20 (nfsd_mutex){+.+.}-{4:4}, at: write_threads+0x3b1/0x610
locks held by syz.9.4798/18257: 3, on CPU#0:
 #0: ffff8881135ff8f0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320
 #1: ffff888115112460 (sb_writers#21){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #2: ffffffff8f09ba20 (nfsd_mutex){+.+.}-{4:4}, at: write_versions+0x95/0xe30
locks held by syz.9.4798/18258: 3, on CPU#1:
 #0: ffff88816ae270f0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320
 #1: ffff888115112460 (sb_writers#21){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #2: ffffffff8f09ba20 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10
locks held by syz.9.4798/18261: 3, on CPU#1:
 #0: ffff8881980afaf0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320
 #1: ffff888115112460 (sb_writers#21){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #2: ffffffff8f09ba20 (nfsd_mutex){+.+.}-{4:4}, at: write_threads+0x3b1/0x610
locks held by syz.1.5041/18917: 3, on CPU#0:
 #0: ffff8881bbace2f0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320
 #1: ffff888115cee460 (sb_writers#21){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #2: ffffffff8f09ba20 (nfsd_mutex
 #2: ffffffff8f09ba20 (nfsd_mutex){+.+.}-{4:4}, at: write_versions+0x95/0xe30
locks held by syz.1.5041/18922: 3, on CPU#0:
 #0: ffff8881bbacf8f0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320
 #1: ffff888115cee460 (sb_writers#21){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #2: ffffffff8f09ba20 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10
locks held by syz.1.5041/18925: 3, on CPU#1:
 #0: ffff8881bbd68af0 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320
 #1: ffff888115cee460 (sb_writers#21){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #2: ffffffff8f09ba20 (nfsd_mutex){+.+.}-{4:4}, at: write_threads+0x3b1/0x610
locks held by syz.8.6251/21698: 2, last CPU#0:
 #0: ffff88801f88c0a0 (&ctx->uring_lock){+.+.}-{4:4}, at: tctx_task_work_run+0x2d3/0xa80
 #1: ffff88810994cee0 (sk_lock-AF_INET){+.+.}-{0:0}, at: inet_sendmsg+0xde/0x320

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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+0x17d/0x390
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 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: 21698 Comm: syz.8.6251 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:native_apic_msr_write+0x39/0x50
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 e9 90 6f 6e 0a cc 89 f6 31 d2 e9 c6 37 a4 03 66 0f 1f 44 00
RSP: 0018:ffffc9000eecf310 EFLAGS: 00000046
RAX: 000000000000e288 RBX: ffff888121023c80 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 000000000000e288 RDI: 0000000000000838
RBP: ffffc9000eecf3e0 R08: ffffffff81b471e5 R09: 0000000000080000
R10: 0000000000000000 R11: ffffffff81754510 R12: 000000000000e288
R13: dffffc0000000000 R14: 0000000010000d6b R15: 0000000000000020
FS:  00007efccd1fd6c0(0000) GS:ffff88818d6e4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2dbe1ff8 CR3: 000000001290e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lapic_next_event+0x11/0x20
 clockevents_program_event+0x385/0x630
 __hrtimer_rearm_deferred+0x36c/0x4b0
 irqentry_exit+0x8d3/0x910
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__sanitizer_cov_trace_pc+0x49/0x80
Code: 29 89 d6 81 e6 00 01 00 0f 81 fe 00 01 00 00 40 0f 95 c6 81 fa 00 00 00 10 0f 93 c2 40 08 f2 75 35 83 b9 34 17 00 00 00 74 2c <8b> 91 08 17 00 00 83 fa 02 75 21 48 8b 91 10 17 00 00 48 8b 32 48
RSP: 0018:ffffc9000eecf538 EFLAGS: 00000246
RAX: ffffffff8a5625c8 RBX: 0000000000008000 RCX: ffff8881a32a3c00
RDX: 8000000000000201 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000eecf6f0 R08: ffff88810994cc80 R09: 000000000000000c
R10: dffffc0000000000 R11: fffff52001dd9e98 R12: 00000000335c7000
R13: 0000000000008557 R14: 0000000000008557 R15: dffffc0000000000
 udp_lib_get_port+0x648/0x1c60
 inet_sendmsg+0x1b8/0x320
 sock_sendmsg_nosec+0x10e/0x180
 sock_write_iter+0x2de/0x3e0
 io_write+0xaf5/0x1680
 __io_issue_sqe+0x188/0x4d0
 io_issue_sqe+0x16d/0x1020
 io_req_task_submit+0xea/0x190
 tctx_task_work_run+0x73d/0xa80
 tctx_task_work+0x3f/0x60
 task_work_run+0x1d9/0x270
 get_signal+0x1181/0x12c0
 arch_do_signal_or_restart+0xbb/0x860
 exit_to_user_mode_loop+0x10e/0x770
 do_syscall_64+0x328/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efccc39e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efccd1fd028 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: 0000000000000003 RBX: 00007efccc625fa0 RCX: 00007efccc39e159
RDX: 0000000000007721 RSI: 0000000000002219 RDI: 0000000000000000
RBP: 00007efccc43506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000016 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efccc626038 R14: 00007efccc625fa0 R15: 00007ffe75982548
 </TASK>
