INFO: task syz-executor.3:15538 blocked for more than 143 seconds.
      Not tainted 5.15.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:22176 pid:15538 ppid:  3553 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0x12c4/0x4590 kernel/sched/core.c:6372
 schedule+0x11b/0x1f0 kernel/sched/core.c:6455
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6514
 __mutex_lock_common+0xe34/0x25a0 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 xfs_qm_dqfree_one+0x66/0x170 fs/xfs/xfs_qm.c:1607
 xfs_qm_shrink_scan+0x314/0x3d0 fs/xfs/xfs_qm.c:523
 do_shrink_slab+0x542/0xda0 mm/vmscan.c:758
 shrink_slab+0x233/0x960 mm/vmscan.c:918
 drop_slab_node+0xed/0x180 mm/vmscan.c:953
 drop_slab+0x8b/0x120 mm/vmscan.c:963
 drop_caches_sysctl_handler+0xb3/0x160 fs/drop_caches.c:66
 proc_sys_call_handler+0x541/0x8a0 fs/proc/proc_sysctl.c:587
 do_iter_readv_writev+0x594/0x7a0
 do_iter_write+0x1ea/0x760 fs/read_write.c:855
 iter_file_splice_write+0x806/0xfa0 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0xe3/0x1c0 fs/splice.c:936
 splice_direct_to_actor+0x500/0xc10 fs/splice.c:891
 do_splice_direct+0x285/0x3d0 fs/splice.c:979
 do_sendfile+0x625/0xff0 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1311 [inline]
 __se_sys_sendfile64+0xfc/0x1e0 fs/read_write.c:1303
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f2cb15a7ae9
RSP: 002b:00007f2cafb290c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f2cb16c6f80 RCX: 00007f2cb15a7ae9
RDX: 0000000020002080 RSI: 0000000000000004 RDI: 0000000000000005
RBP: 00007f2cb15f347a R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000023b R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f2cb16c6f80 R15: 00007fff6c3aef38
 </TASK>
INFO: task syz-executor.2:15540 blocked for more than 143 seconds.
      Not tainted 5.15.132-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2  state:D stack:22176 pid:15540 ppid:  3555 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0x12c4/0x4590 kernel/sched/core.c:6372
 schedule+0x11b/0x1f0 kernel/sched/core.c:6455
 schedule_timeout+0xac/0x300 kernel/time/timer.c:1860
 do_wait_for_common+0x2d9/0x480 kernel/sched/completion.c:85
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x48/0x60 kernel/sched/completion.c:138
 xfs_buf_iowait+0xb4/0x400 fs/xfs/xfs_buf.c:1573
 xfs_buf_delwri_pushbuf+0x2cf/0x4b0 fs/xfs/xfs_buf.c:2251
 xfs_qm_flush_one+0x266/0x350 fs/xfs/xfs_qm.c:1249
 xfs_qm_dquot_walk+0x22a/0x4a0 fs/xfs/xfs_qm.c:86
 xfs_qm_quotacheck+0x34e/0x640 fs/xfs/xfs_qm.c:1339
 xfs_qm_mount_quotas+0x328/0x610 fs/xfs/xfs_qm.c:1441
 xfs_mountfs+0x162b/0x1ca0 fs/xfs/xfs_mount.c:904
 xfs_fs_fill_super+0xfd4/0x1210 fs/xfs/xfs_super.c:1658
 get_tree_bdev+0x3fe/0x620 fs/super.c:1312
 vfs_get_tree+0x88/0x270 fs/super.c:1517
 do_new_mount+0x28b/0xae0 fs/namespace.c:2994
 do_mount fs/namespace.c:3337 [inline]
 __do_sys_mount fs/namespace.c:3545 [inline]
 __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3522
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fe74f7e31ea
RSP: 002b:00007fe74dd62ee8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fe74dd62f80 RCX: 00007fe74f7e31ea
RDX: 0000000020009700 RSI: 0000000020000040 RDI: 00007fe74dd62f40
RBP: 0000000020009700 R08: 00007fe74dd62f80 R09: 0000000002000000
R10: 0000000002000000 R11: 0000000000000202 R12: 0000000020000040
R13: 00007fe74dd62f40 R14: 00000000000096cb R15: 00000000200000c0
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8c91f0a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3261:
 #0: ffff88814aca6098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc90002bb32e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1db0 drivers/tty/n_tty.c:2158
2 locks held by kworker/u4:3/19806:
3 locks held by syz-executor.3/15538:
 #0: ffff88807ecc6460 (sb_writers#4){.+.+}-{0:0}, at: do_sendfile+0x600/0xff0 fs/read_write.c:1248
 #1: ffffffff8c9bd330 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0x125/0x960 mm/vmscan.c:908
 #2: ffff88807cf16158 (&qinf->qi_tree_lock){+.+.}-{3:3}, at: xfs_qm_dqfree_one+0x66/0x170 fs/xfs/xfs_qm.c:1607
3 locks held by syz-executor.2/15540:
 #0: ffff888075f260e0 (&type->s_umount_key#64/1){+.+.}-{3:3}, at: alloc_super+0x210/0x940 fs/super.c:229
 #1: ffff88807cf16158 (&qinf->qi_tree_lock){+.+.}-{3:3}, at: xfs_qm_dquot_walk+0x132/0x4a0 fs/xfs/xfs_qm.c:73
 #2: ffff888025746318 (&xfs_dquot_group_class){+.+.}-{3:3}, at: xfs_dqlock fs/xfs/xfs_dquot.h:133 [inline]
 #2: ffff888025746318 (&xfs_dquot_group_class){+.+.}-{3:3}, at: xfs_qm_flush_one+0xca/0x350 fs/xfs/xfs_qm.c:1225
2 locks held by syz-executor.3/15591:
 #0: ffff8880b3b1e0e0 (&type->s_umount_key#23/1){+.+.}-{3:3}, at: alloc_super+0x210/0x940 fs/super.c:229
 #1: ffffffff8c9bd330 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
 #1: ffffffff8c9bd330 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0x92/0x7c0 mm/vmscan.c:620
2 locks held by syz-executor.2/15595:
 #0: ffff88808fb020e0 (&type->s_umount_key#23/1){+.+.}-{3:3}, at: alloc_super+0x210/0x940 fs/super.c:229
 #1: ffffffff8c9bd330 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
 #1: ffffffff8c9bd330 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0x92/0x7c0 mm/vmscan.c:620
2 locks held by syz-executor.3/15605:
 #0: ffff8880b13e20e0 (&type->s_umount_key#23/1){+.+.}-{3:3}, at: alloc_super+0x210/0x940 fs/super.c:229
 #1: ffffffff8c9bd330 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
 #1: ffffffff8c9bd330 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0x92/0x7c0 mm/vmscan.c:620
2 locks held by syz-executor.2/15611:
 #0: ffff88809d4900e0 (&type->s_umount_key#23/1){+.+.}-{3:3}, at: alloc_super+0x210/0x940 fs/super.c:229
 #1: ffffffff8c9bd330 (shrinker_rwsem){++++}-{3:3}, at: prealloc_memcg_shrinker mm/vmscan.c:359 [inline]
 #1: ffffffff8c9bd330 (shrinker_rwsem){++++}-{3:3}, at: prealloc_shrinker+0x92/0x7c0 mm/vmscan.c:620

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

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.132-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
 watchdog+0xe72/0xeb0 kernel/hung_task.c:295
 kthread+0x3f6/0x4f0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6841 Comm: kworker/u4:12 Not tainted 5.15.132-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Workqueue: bat_events batadv_nc_worker
RIP: 0010:check_preemption_disabled+0x5c/0x110 lib/smp_processor_id.c:19
Code: 25 28 00 00 00 48 3b 44 24 08 0f 85 c7 00 00 00 89 d8 48 83 c4 10 5b 41 5c 41 5e 41 5f c3 48 c7 04 24 00 00 00 00 9c 8f 04 24 <f7> 04 24 00 02 00 00 74 c9 49 89 f6 49 89 ff 65 4c 8b 25 dd 82 e5
RSP: 0018:ffffc90002d4fa88 EFLAGS: 00000046
RAX: 0000000080000000 RBX: 0000000000000001 RCX: ffffc90002d4fb03
RDX: 0000000000000002 RSI: ffffffff8a8b1f00 RDI: ffffffff8ad87980
RBP: ffffc90002d4fbe8 R08: dffffc0000000000 R09: fffffbfff1bc81fe
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920005a9f64
R13: 0000000000000246 R14: ffffc90002d4fb50 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c262dbf330 CR3: 00000000236e8000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 lockdep_recursion_finish kernel/locking/lockdep.c:436 [inline]
 lock_release+0x5c1/0x9a0 kernel/locking/lockdep.c:5644
 rcu_read_unlock include/linux/rcupdate.h:729 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:416 [inline]
 batadv_nc_worker+0x239/0x5b0 net/batman-adv/network-coding.c:723
 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
 kthread+0x3f6/0x4f0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>