INFO: task syz.6.1955:17196 blocked for more than 143 seconds.
      Not tainted 6.16.0-rc5-syzkaller-00193-g40f92e79b0aa-dirty #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.1955      state:D stack:28904 pid:17196 tgid:17195 ppid:16469  task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x16f5/0x4d00
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x552/0x880
 down_read+0x98/0x2e0
 super_lock+0x2a9/0x3b0
 __iterate_supers+0x126/0x250
 ksys_sync+0x94/0x150
 __ia32_sys_sync+0xe/0x20
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa10518e9a9
RSP: 002b:00007fa10600b038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fa1053b5fa0 RCX: 00007fa10518e9a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fa1053b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa1053b5fa0 R15: 00007ffed9a8aa08
 </TASK>

Showing all locks held in the system:
1 lock held by ksoftirqd/1/23:
1 lock held by khungtaskd/34:
 #0: ffffffff8e13f160 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5658:
 #0: ffff88810d6610a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000254f2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
3 locks held by kworker/1:6/7679:
2 locks held by syz-executor/15605:
1 lock held by syz.6.1955/17196:
 #0: ffff88801b6900e0 (&type->s_umount_key#82){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.5.2124/18288:
 #0: ffff88801b6900e0 (&type->s_umount_key#82){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
6 locks held by kworker/u8:0/20217:
 #0: ffff88801b2f6948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90003bcfbc0 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f50ef90 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf7/0x800
 #3: ffff88801f4ef0e8 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x10a/0x3d0
 #4: ffff888039871250 (&devlink->lock_key#31){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x11c/0x3d0
 #5: ffffffff8e144b40 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x570
1 lock held by syz.8.2521/20494:
 #0: ffff88801b6900e0 (&type->s_umount_key#82){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz-executor/21947:
 #0: ffffffff8e144c78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730
1 lock held by syz.9.2769/21963:
3 locks held by rm/21970:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 Comm: khungtaskd Not tainted 6.16.0-rc5-syzkaller-00193-g40f92e79b0aa-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+0xfee/0x1030
 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: 21664 Comm: syz-executor Not tainted 6.16.0-rc5-syzkaller-00193-g40f92e79b0aa-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:lock_release+0x287/0x3e0
Code: 89 f6 48 8b 54 24 18 e8 57 30 00 00 48 8b 5c 24 08 48 c7 c7 d7 37 b8 8d e8 76 21 cf 09 b8 ff ff ff ff 65 0f c1 05 79 8e 01 11 <83> f8 01 75 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24
RSP: 0018:ffffc9000312f810 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 0000000000000202 RCX: d246097cb5fed700
RDX: 0000000000000000 RSI: ffffffff8db837d7 RDI: ffffffff8be28c40
RBP: ffff888020f8a7b0 R08: 0000000000000000 R09: ffffffff822d4f02
R10: dffffc0000000000 R11: fffff9400013381f R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8e13f160 R15: ffff888020f89cc0
FS:  000055556b34c500(0000) GS:ffff8881a3c26000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f14c6e5bbd0 CR3: 000000000df38000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 page_ext_put+0xa3/0xc0
 __reset_page_owner+0x67/0x1f0
 __free_frozen_pages+0xc71/0xe70
 vfree+0x25a/0x400
 kcov_close+0x28/0x50
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 do_exit+0x6b5/0x22e0
 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: 0033:0x7fa3b4b8df57
Code: Unable to access opcode bytes at 0x7fa3b4b8df2d.
RSP: 002b:00007fff77a67be8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fa3b4b8df57
RDX: 00007fff77a67c10 RSI: 00007fff77a67ca0 RDI: 00007fff77a67ca0
RBP: 00007fff77a67ca0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007fff77a68d30
R13: 00007fa3b4c10b55 R14: 000000000008aac0 R15: 00007fff77a68d70
 </TASK>
