INFO: task syz-executor417:5074 blocked for more than 143 seconds.
      Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor417 state:D stack:20088 pid:5074  tgid:5074  ppid:5072   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0x17d3/0x4a20 kernel/sched/core.c:6736
 __schedule_loop kernel/sched/core.c:6813 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6828
 io_schedule+0x8d/0x110 kernel/sched/core.c:9034
 bit_wait_io+0x12/0xd0 kernel/sched/wait_bit.c:209
 __wait_on_bit_lock+0xd7/0x530 kernel/sched/wait_bit.c:90
 out_of_line_wait_on_bit_lock+0x1d5/0x260 kernel/sched/wait_bit.c:117
 lock_buffer include/linux/buffer_head.h:401 [inline]
 ext4_quota_write+0x381/0x580 fs/ext4/super.c:7240
 qtree_write_dquot+0x26b/0x5b0 fs/quota/quota_tree.c:462
 v2_write_dquot+0x189/0x2a0 fs/quota/quota_v2.c:372
 dquot_commit+0x3cb/0x520 fs/quota/dquot.c:514
 ext4_write_dquot+0x1f2/0x2c0 fs/ext4/super.c:6866
 mark_dquot_dirty fs/quota/dquot.c:372 [inline]
 mark_all_dquot_dirty+0xfd/0x410 fs/quota/dquot.c:412
 dquot_alloc_inode+0x7ea/0xc90 fs/quota/dquot.c:1789
 ext4_xattr_inode_alloc_quota fs/ext4/xattr.c:932 [inline]
 ext4_xattr_set_entry+0xaf3/0x3fd0 fs/ext4/xattr.c:1715
 ext4_xattr_block_set+0x6a2/0x35e0 fs/ext4/xattr.c:1970
 ext4_xattr_set_handle+0xe54/0x1780 fs/ext4/xattr.c:2456
 ext4_xattr_set+0x241/0x3d0 fs/ext4/xattr.c:2558
 __vfs_setxattr+0x46a/0x4a0 fs/xattr.c:200
 __vfs_setxattr_noperm+0x12e/0x5e0 fs/xattr.c:234
 vfs_setxattr+0x221/0x430 fs/xattr.c:321
 do_setxattr fs/xattr.c:629 [inline]
 setxattr+0x25d/0x2f0 fs/xattr.c:652
 path_setxattr+0x1c0/0x2a0 fs/xattr.c:671
 __do_sys_setxattr fs/xattr.c:687 [inline]
 __se_sys_setxattr fs/xattr.c:683 [inline]
 __x64_sys_setxattr+0xbb/0xd0 fs/xattr.c:683
 do_syscall_64+0xfd/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f6d8f0fed99
RSP: 002b:00007ffeb0995e48 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f6d8f0fed99
RDX: 0000000020000380 RSI: 0000000020000340 RDI: 00000000200002c0
RBP: 00007f6d8f1735f0 R08: 0000000000000000 R09: 000055558a0404c0
R10: 000000000000ffed R11: 0000000000000246 R12: 00007ffeb0995e70
R13: 00007ffeb0996098 R14: 431bde82d7b634db R15: 00007f6d8f14803b
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #0: ffffffff8e132020 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by getty/4824:
 #0: ffff888029efc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201
6 locks held by syz-executor417/5074:
 #0: ffff8880227c2420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409
 #1: ffff88807a960e00 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:793 [inline]
 #1: ffff88807a960e00 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: vfs_setxattr+0x1e1/0x430 fs/xattr.c:320
 #2: ffff88807a960ac8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline]
 #2: ffff88807a960ac8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x26b/0x1780 fs/ext4/xattr.c:2371
 #3: ffffffff8e291830 (dquot_srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:116 [inline]
 #3: ffffffff8e291830 (dquot_srcu){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:215 [inline]
 #3: ffffffff8e291830 (dquot_srcu){.+.+}-{0:0}, at: dquot_alloc_inode+0x1bf/0xc90 fs/quota/dquot.c:1765
 #4: ffff88807aac00a8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x5b/0x520 fs/quota/dquot.c:507
 #5: ffff8880227c2210 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x9c/0x2a0 fs/quota/quota_v2.c:369

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

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xfb0/0xff0 kernel/hung_task.c:379
 kthread+0x2f2/0x390 kernel/kthread.c:388
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 11 Comm: kworker/u8:1 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:_static_cpu_has arch/x86/include/asm/cpufeature.h:171 [inline]
RIP: 0010:build_cr3 arch/x86/mm/tlb.c:162 [inline]
RIP: 0010:load_new_mm_cr3+0xbb/0x210 arch/x86/mm/tlb.c:289
Code: 06 48 8d bc c3 96 d1 03 00 be 08 00 00 00 e8 ec 41 b6 00 48 0f ab ab 96 d1 03 00 f3 0f 1e fa 4c 89 ff e8 38 e9 ff ff 4c 09 f0 <e9> 1b 01 00 00 f3 0f 1e fa 41 0f b7 cd 81 f9 ff 07 00 00 0f 83 a4
RSP: 0018:ffffc90000107608 EFLAGS: 00000006
RAX: 0000000014c64000 RBX: 0000000000000001 RCX: ffff888016eabc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000107730 R08: ffffffff8141ef1c R09: 1ffff1100298d0c4
R10: dffffc0000000000 R11: ffffed100298d0c5 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff888014c64000
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d97672d600 CR3: 000000000df32000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 switch_mm_irqs_off+0x7c1/0xae0
 use_temporary_mm arch/x86/kernel/alternative.c:1810 [inline]
 __text_poke+0x71a/0xd30 arch/x86/kernel/alternative.c:1921
 text_poke arch/x86/kernel/alternative.c:1985 [inline]
 text_poke_bp_batch+0x59c/0xb30 arch/x86/kernel/alternative.c:2318
 text_poke_flush arch/x86/kernel/alternative.c:2487 [inline]
 text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2494
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:205
 static_key_enable+0x1a/0x20 kernel/jump_label.c:218
 toggle_allocation_gate+0xb5/0x250 mm/kfence/core.c:826
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0xa02/0x1770 kernel/workqueue.c:3335
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416
 kthread+0x2f2/0x390 kernel/kthread.c:388
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.135 msecs