INFO: task syz.1.4655:18486 blocked for more than 143 seconds.
      Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.4655      state:D stack:25128 pid:18486 tgid:18485 ppid:5850   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: 0033:0x7f93b158ebe9
RSP: 002b:00007f93b2317038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f93b17b5fa0 RCX: 00007f93b158ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f93b17b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f93b17b6038 R14: 00007f93b17b5fa0 R15: 00007ffecf862678
 </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
2 locks held by kworker/u10:10/1104:
2 locks held by getty/5674:
 #0: ffff8880297430a0 (&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
1 lock held by udevd/6943:
 #0: ffff888021d6f358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
1 lock held by udevd/6944:
1 lock held by syz.1.4655/18486:
 #0: ffff888021d6f358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x1ac/0x340
1 lock held by syz.0.4919/19157:
 #0: ffff888021d6f358 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x1ac/0x340
2 locks held by syz.4.6169/22437:
1 lock held by syz.8.6170/22440:
 #0: ffff888107f14d20 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x211/0x4d0
2 locks held by syz.8.6170/22441:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 Comm: khungtaskd Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895 #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: 5277 Comm: syslogd Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895 #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:rcu_read_lock_held+0x1e/0x50
Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 53 e8 56 6f d3 09 85 c0 74 26 31 db e8 eb 2d 01 00 84 c0 74 20 e8 62 76 01 00 <84> c0 74 17 48 c7 c7 e0 9e 13 8e be ff ff ff ff 5b e9 3c 6b d3 09
RSP: 0018:ffffc900024af828 EFLAGS: 00000286
RAX: 1ffffffff1c27e01 RBX: 0000000000000000 RCX: f942735de822fb00
RDX: ffff888022ac5640 RSI: ffffffff8be325e0 RDI: ffff88813663afa8
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81f69bdd
R10: ffffc900024af940 R11: fffff52000495f2b R12: ffff88812381df30
R13: ffffc900024af938 R14: ffffc900024af920 R15: 1ffff92000495f27
FS:  00007f5241d52380(0000) GS:ffff8881a3c24000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe7ba465fc8 CR3: 000000010d1e8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 xas_start+0x295/0x770
 xas_load+0x2c/0x5b0
 filemap_get_entry+0x168/0x2f0
 shmem_get_folio_gfp+0x237/0x1660
 shmem_write_begin+0xf7/0x2b0
 generic_perform_write+0x2c5/0x900
 shmem_file_write_iter+0xf8/0x120
 vfs_write+0x54b/0xa90
 ksys_write+0x145/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5241ea6bf2
Code: 89 c7 48 89 44 24 08 e8 7b 34 fa ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6f 48 8b 15 07 a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffdb4806418 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f5241ea6bf2
RDX: 0000000000000060 RSI: 000055d6e0e7fc50 RDI: 0000000000000003
RBP: 000055d6e0e7fc50 R08: 0000000000000000 R09: 0000000000000000
R10: 000055d6e0e7ff00 R11: 0000000000000246 R12: 0000000000000060
R13: 00007f5241d52300 R14: 0000000000000004 R15: 000055d6e0e7fa60
 </TASK>
