rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10002 jiffies, g=3369, q=743 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10001 (4294955517-4294945516), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10002 jiffies! g3369 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:14592 pid:16    tgid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x624/0x9d0 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0xab/0x110 kernel/sched/core.c:6817
 schedule_timeout+0x107/0x170 kernel/time/timer.c:2183
 rcu_gp_fqs_loop+0x17a/0x580 kernel/rcu/tree.c:1631
 rcu_gp_kthread+0x1c/0x110 kernel/rcu/tree.c:1830
 kthread+0xe8/0x100 kernel/kthread.c:388
 ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3499 Comm: syz.3.16 Not tainted 6.8.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:lock_acquire+0x112/0x1c0 kernel/locking/lockdep.c:5757
Code: 48 c7 c7 e0 e9 e9 82 e8 9c a5 46 01 65 c7 05 b1 d4 f1 7e 00 00 00 00 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 <75> 33 f7 44 24 08 00 02 00 00 74 01 fb 48 83 c4 10 5b 41 5c 41 5d
RSP: 0018:ffffc900027937a8 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000246 RCX: 0000000000000000
RDX: ab77142d0de484c9 RSI: ffffffff82fe8baf RDI: ffffffff82f2abb5
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000018
R10: 0000000000000003 R11: ffffffff8144cdd0 R12: ffffffff833d9688
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fb5c857c6c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555556bc74a8 CR3: 0000000106f94000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 rcu_read_lock include/linux/rcupdate.h:750 [inline]
 ext4_update_other_inodes_time fs/ext4/inode.c:5064 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5117 [inline]
 ext4_mark_iloc_dirty+0x1b6/0x5e0 fs/ext4/inode.c:5739
 __ext4_mark_inode_dirty+0x182/0x200 fs/ext4/inode.c:5943
 ext4_dirty_inode+0x5f/0x80 fs/ext4/inode.c:5972
 __mark_inode_dirty+0xb7/0x3c0 fs/fs-writeback.c:2452
 mark_inode_dirty_sync include/linux/fs.h:2388 [inline]
 dquot_free_space include/linux/quotaops.h:380 [inline]
 dquot_free_block include/linux/quotaops.h:390 [inline]
 ext4_xattr_block_set+0x6b4/0xcd0 fs/ext4/xattr.c:2103
 ext4_xattr_set_handle+0x4f9/0x710 fs/ext4/xattr.c:2456
 ext4_initxattrs+0x38/0x60 fs/ext4/xattr_security.c:44
 security_inode_init_security+0x115/0x180 security/security.c:1752
 __ext4_new_inode+0x114c/0x1340 fs/ext4/ialloc.c:1326
 ext4_create+0xab/0x190 fs/ext4/namei.c:2831
 lookup_open fs/namei.c:3496 [inline]
 open_last_lookups fs/namei.c:3565 [inline]
 path_openat+0x59e/0xd30 fs/namei.c:3795
 do_filp_open+0x9e/0x120 fs/namei.c:3825
 do_sys_openat2+0x6d/0xb0 fs/open.c:1404
 do_sys_open fs/open.c:1419 [inline]
 __do_sys_openat fs/open.c:1435 [inline]
 __se_sys_openat fs/open.c:1430 [inline]
 __x64_sys_openat+0x6e/0x80 fs/open.c:1430
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x92/0x180 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7fb5c778e969
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb5c857c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fb5c79b5fa0 RCX: 00007fb5c778e969
RDX: 0000000000101042 RSI: 0000200000000140 RDI: ffffffffffffff9c
RBP: 00007fb5c7810ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb5c79b5fa0 R15: 00007ffd74d47918
 </TASK>