INFO: task syz-executor.5:19743 blocked for more than 143 seconds.
Not tainted 5.15.145-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.5 state:D stack:19520 pid:19743 ppid: 3543 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5030 [inline]
__schedule+0x12c4/0x45b0 kernel/sched/core.c:6376
schedule+0x11b/0x1f0 kernel/sched/core.c:6459
io_schedule+0x88/0x100 kernel/sched/core.c:8484
bit_wait_io+0xe/0xc0 kernel/sched/wait_bit.c:209
__wait_on_bit_lock+0xbf/0x1a0 kernel/sched/wait_bit.c:90
out_of_line_wait_on_bit_lock+0x1d0/0x250 kernel/sched/wait_bit.c:117
lock_buffer include/linux/buffer_head.h:402 [inline]
ext4_quota_write+0x37a/0x580 fs/ext4/super.c:6561
qtree_write_dquot+0x23f/0x530 fs/quota/quota_tree.c:422
v2_write_dquot+0x11c/0x190 fs/quota/quota_v2.c:358
dquot_commit+0x3c0/0x510 fs/quota/dquot.c:512
ext4_write_dquot+0x1e8/0x2b0 fs/ext4/super.c:6164
mark_dquot_dirty fs/quota/dquot.c:372 [inline]
mark_all_dquot_dirty fs/quota/dquot.c:410 [inline]
dquot_alloc_inode+0x645/0xb00 fs/quota/dquot.c:1838
ext4_xattr_inode_alloc_quota fs/ext4/xattr.c:883 [inline]
ext4_xattr_set_entry+0xb06/0x3fb0 fs/ext4/xattr.c:1665
ext4_xattr_block_set+0x69a/0x3630 fs/ext4/xattr.c:1920
ext4_xattr_set_handle+0xdac/0x1560 fs/ext4/xattr.c:2406
ext4_xattr_set+0x231/0x3d0 fs/ext4/xattr.c:2507
__vfs_setxattr+0x3e7/0x420 fs/xattr.c:182
__vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216
vfs_setxattr+0x21d/0x420 fs/xattr.c:303
do_setxattr fs/xattr.c:588 [inline]
setxattr+0x27e/0x2e0 fs/xattr.c:611
path_setxattr+0x1bc/0x2a0 fs/xattr.c:630
__do_sys_setxattr fs/xattr.c:646 [inline]
__se_sys_setxattr fs/xattr.c:642 [inline]
__x64_sys_setxattr+0xb7/0xd0 fs/xattr.c:642
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: 0033:0x7f126f7c5ce9
RSP: 002b:00007f126dd470c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f126f8e4f80 RCX: 00007f126f7c5ce9
RDX: 0000000020000380 RSI: 0000000020000340 RDI: 00000000200002c0
RBP: 00007f126f81247a R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000ffed R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f126f8e4f80 R15: 00007fff0d709fb8
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8c91f220 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
3 locks held by kworker/u4:1/144:
3 locks held by kworker/u4:2/154:
2 locks held by getty/3261:
#0: ffff88802455f098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc90002bab2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1db0 drivers/tty/n_tty.c:2158
2 locks held by syz-executor.2/3555:
#0: ffff8880b9a39718 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475
#1: ffff8880b9a27848 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x53d/0x810 kernel/sched/psi.c:891
6 locks held by syz-executor.5/19743:
#0: ffff88807ca48460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377
#1: ffff8880a13ae7a0 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff8880a13ae7a0 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: vfs_setxattr+0x1dd/0x420 fs/xattr.c:302
#2: ffff8880a13ae478 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline]
#2: ffff8880a13ae478 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x270/0x1560 fs/ext4/xattr.c:2321
#3: ffffffff8ca42a58 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:268
#4: ffff88809f022268 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x57/0x510 fs/quota/dquot.c:505
#5: ffff88807ca48208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x8c/0x190 fs/quota/quota_v2.c:356
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.145-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 144 Comm: kworker/u4:1 Not tainted 5.15.145-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Workqueue: netns cleanup_net
RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:214 [inline]
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:135 [inline]
RIP: 0010:hlock_class kernel/locking/lockdep.c:197 [inline]
RIP: 0010:__lock_acquire+0x1209/0x1ff0 kernel/locking/lockdep.c:5009
Code: 04 38 84 c0 0f 85 2b 0a 00 00 41 8b 1f 81 e3 ff 1f 00 00 89 d8 c1 e8 06 48 8d 3c c5 c0 f0 bc 8f be 08 00 00 00 e8 67 48 67 00 <48> 0f a3 1d 9f 5a 5a 0e 73 1b 48 8d 04 5b 48 c1 e0 06 48 8d 98 c0
RSP: 0018:ffffc900010af800 EFLAGS: 00000056
RAX: 0000000000000001 RBX: 0000000000000029 RCX: ffffffff81629619
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8fbcf0c0
RBP: e05a0fb1159ab8c0 R08: dffffc0000000000 R09: fffffbfff1f79e19
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000003
R13: ffff8880129a0ae8 R14: ffff8880129a0000 R15: ffff8880129a0b88
FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f85272b5198 CR3: 0000000099a3f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:269
rcu_read_lock include/linux/rcupdate.h:696 [inline]
inet_twsk_purge+0x11e/0xa20 net/ipv4/inet_timewait_sock.c:268
ops_exit_list net/core/net_namespace.c:174 [inline]
cleanup_net+0x763/0xb60 net/core/net_namespace.c:596
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>