INFO: task syz.3.6770:31172 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.3.6770      state:D stack:25752 pid:31172 tgid:31171 ppid:27822  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x16f9/0x5500
 rt_mutex_schedule+0x76/0xf0
 rt_mutex_slowlock_block+0x508/0x680
 rt_mutex_slowlock+0x2dc/0x780
 mutex_lock_nested+0x168/0x1d0
 sync_bdevs+0x27e/0x470
 __ia32_sys_sync+0xc5/0x120
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f671d4fcdd9
RSP: 002b:00007f671b756028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f671d775fa0 RCX: 00007f671d4fcdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f671d775fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f671d776038 R14: 00007f671d775fa0 R15: 00007fff292c5018
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/42:
 #0: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by kworker/u9:4/88:
 #0: ffff8881000ac138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x897/0x1630
 #1: ffffc9000314fc40 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630
2 locks held by kworker/u9:11/3483:
 #0: ffff8881000ac138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x897/0x1630
 #1: ffffc90020e5fc40 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630
2 locks held by getty/5415:
 #0: ffff8881738dc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc90003f062e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x462/0x13a0
1 lock held by udevd/28621:
 #0: ffff8881093c34c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xcc0
1 lock held by udevd/29407:
 #0: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa6/0x2550
2 locks held by udevd/29409:
 #0: ffffffff8e6ea4f8 (tomoyo_ss){.+.+}-{0:0}, at: tomoyo_check_open_permission+0x1d3/0x470
 #1: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa6/0x2550
1 lock held by syz.3.6770/31172:
 #0: ffff8881093c34c8 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x27e/0x470
3 locks held by syz.7.7326/1340:
 #0: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: folio_lruvec_lock_irqsave+0x24/0x540
 #1: ffff888113528930 (_T->lock){....}-{2:2}, at: rt_mutex_slowunlock+0xbf/0x8b0
 #2: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e0/0x400
2 locks held by syz.2.7328/1352:
 #0: ffff888113f044b0 (&mm->mmap_lock){++++}-{4:4}, at: madvise_lock+0x152/0x2e0
 #1: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa6/0x2550
2 locks held by syz.2.7328/1360:
 #0: ffff888167b9f718 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x2bc/0x4b0
 #1: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa6/0x2550
1 lock held by syz.2.7328/1364:
 #0: ffff888167b9f718 (mapping.invalidate_lock){++++}-{4:4}, at: page_cache_ra_order+0x2bc/0x4b0
1 lock held by syz.1.7330/1366:
 #0: ffff88817338f558 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: process_measurement+0x7fd/0x1c90

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 42 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT_{RT,(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+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd3/0x1030
 kthread+0x388/0x470
 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: 1340 Comm: syz.7.7326 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(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:__rcu_read_unlock+0x69/0xe0
Code: 00 00 4c 89 f0 48 c1 e8 03 42 0f b6 04 38 84 c0 75 66 41 83 3e 00 75 27 43 0f b6 04 3c 84 c0 75 41 8b 03 3d 00 00 00 40 73 0f <5b> 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc cc 90 0f 0b 90 eb eb e8
RSP: 0018:ffffc9000527f108 EFLAGS: 00000287
RAX: 0000000000000000 RBX: ffff88816ba7bfc4 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8d888777 RDI: ffff88816ba7bb00
RBP: dffffc0000000000 R08: ffffc9000527fcc0 R09: 0000000000000000
R10: ffffc9000527f258 R11: fffff52000a4fe4d R12: 1ffff1102d74f7f8
R13: ffffc90005278000 R14: ffff88816ba7bfc8 R15: dffffc0000000000
FS:  00007fbe3ff566c0(0000) GS:ffff88818e91f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000005c0 CR3: 000000011d704000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 unwind_next_frame+0x1bbf/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 save_stack+0x122/0x230
 __reset_page_owner+0x71/0x1f0
 free_unref_folios+0xc78/0x1980
 folios_put_refs+0x7dd/0x8f0
 shmem_undo_range+0x52c/0x1660
 shmem_evict_inode+0x289/0xae0
 evict+0x61e/0xb10
 __dentry_kill+0x1a2/0x690
 finish_dput+0xc9/0x480
 __fput+0x6a3/0xa70
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xf3/0x4d0
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbe41cbd60e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007fbe3ff55df8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00007fbe3ff566c0 RCX: 00007fbe41cbd60e
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016
R13: 00007fbe3ff55ea0 R14: 000000000000558d R15: 0000200000000c40
 </TASK>
