INFO: task syz.5.8519:4723 blocked for more than 143 seconds.
      Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.8519      state:D stack:27944 pid:4723  tgid:4722  ppid:11994  task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1360
 sync_bdevs+0x1ac/0x340
 ksys_sync+0xb9/0x150
 __ia32_sys_sync+0xe/0x20
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9b2438ebe9
RSP: 002b:00007f9b251e7038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f9b245b5fa0 RCX: 00007f9b2438ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f9b245b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9b245b6038 R14: 00007f9b245b5fa0 R15: 00007ffee26ad868
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/1:2/1274:
2 locks held by getty/5676:
 #0: ffff8881069110a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
3 locks held by kworker/u8:2/5854:
 #0: ffff888136639f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
 #1: ffff888136624008 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
 #2: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa5/0x2390
3 locks held by kworker/0:4/5895:
 #0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000340fbc0 (key_gc_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8e13f978 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730
2 locks held by syz.3.1683/10399:
2 locks held by syz.3.3270/19816:
3 locks held by kworker/0:7/23776:
 #0: ffff88801a480d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90007e07bc0 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8e13f978 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730
1 lock held by udevd/27701:
 #0: ffff88810722a358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by syz.5.8519/4723:
 #0: ffff88810722a358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x1ac/0x340
2 locks held by syz.0.9028/7450:
 #0: ffff88811e8020e0 (&type->s_umount_key#137/1){+.+.}-{4:4}, at: alloc_super+0x204/0x970
 #1: ffff88810722a358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by syz-executor/13531:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 Comm: khungtaskd Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #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+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 13531 Comm: syz-executor Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #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:cpuacct_charge+0x1f1/0x320
Code: 74 08 4c 89 ff e8 6f 4f 89 00 4d 03 2f 4c 89 e8 48 c1 e8 03 80 3c 28 00 74 08 4c 89 ef e8 57 4f 89 00 48 8b 04 24 49 01 45 00 <49> 81 c4 08 01 00 00 4c 89 e0 48 c1 e8 03 80 3c 28 00 74 8a 4c 89
RSP: 0018:ffffc9000424efa8 EFLAGS: 00000012
RAX: 00000000001990b7 RBX: 1ffffffff1b7b7a3 RCX: cc1e4bf083a2ce00
RDX: 0000000000000000 RSI: ffffffff8dba33cb RDI: ffffffff8be32600
RBP: dffffc0000000000 R08: ffffffff8fa34237 R09: 1ffffffff1f46846
R10: dffffc0000000000 R11: fffffbfff1f46847 R12: ffff888123346000
R13: ffffe8ffffc4aaa8 R14: 0000000000000001 R15: ffffffff8dbdbd18
FS:  0000555591a97500(0000) GS:ffff8881a3c24000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000026000 CR3: 000000002c208000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 update_se+0x2ba/0x5f0
 update_curr+0x75/0x730
 put_prev_entity+0x41/0x230
 put_prev_task_fair+0x4b/0x80
 put_prev_set_next_task+0x10a/0x180
 __pick_next_task+0x3eb/0x450
 __schedule+0x7a4/0x4cc0
 preempt_schedule_irq+0xb5/0x150
 irqentry_exit+0x6f/0x90
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:unwind_next_frame+0xcc6/0x2390
Code: e9 c5 04 00 00 4c 89 7c 24 28 48 89 5c 24 78 4d 8d 66 08 4d 89 e5 49 c1 ed 03 41 80 7c 2d 00 00 74 08 4c 89 e7 e8 fa 47 b0 00 <49> 8b 5e 08 49 8d 56 10 49 89 d7 49 c1 ef 03 41 80 3c 2f 00 74 0e
RSP: 0018:ffffc9000424f538 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff902a38ab RCX: ffffffff8fb1395c
RDX: ffffffff902a38a6 RSI: 0000000000000003 RDI: ffffffff8be325a0
RBP: dffffc0000000000 R08: 0000000000000022 R09: ffffffff8172c195
R10: ffffc9000424f658 R11: ffffffff81ac3890 R12: ffffc9000424f610
R13: 1ffff92000849ec2 R14: ffffc9000424f608 R15: 1ffffffff2054715
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 save_stack+0xf5/0x1f0
 __reset_page_owner+0x71/0x1f0
 __free_frozen_pages+0xbc4/0xd30
 vfree+0x25a/0x400
 kcov_close+0x28/0x50
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 do_exit+0x6b5/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4b453c14a5
Code: Unable to access opcode bytes at 0x7f4b453c147b.
RSP: 002b:00007fff98c776c0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f4b453c14a5
RDX: 00007fff98c77700 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff98c7776c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000001388
R13: 00000000000927c0 R14: 00000000000de033 R15: 00007fff98c777c0
 </TASK>
