rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10563 ticks this GP) idle=870c/1/0x4000000000000000 softirq=60144/60146 fqs=140
	(t=10500 jiffies g=88161 q=206 ncpus=2)
rcu: rcu_preempt kthread starved for 10220 jiffies! g88161 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
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:27576 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 schedule+0xb9/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:741
CPU: 0 PID: 13725 Comm: syz.1.2377 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__kasan_check_write+0x0/0x10 mm/kasan/shadow.c:37
Code: 8c eb 0a 48 c7 c7 6c c6 43 8c 48 89 de e8 18 88 3b 08 31 ed eb d7 00 00 cc cc 89 f6 48 8b 0c 24 31 d2 e9 a3 ec ff ff 0f 1f 00 <89> f6 48 8b 0c 24 ba 01 00 00 00 e9 90 ec ff ff 55 41 56 53 48 89
RSP: 0018:ffffc90005a8fad8 EFLAGS: 00000256
RAX: 00000000ffffff01 RBX: ffffffff8cc677a0 RCX: ffffffff816435ee
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90005a8fb20
RBP: ffffc90005a8fb90 R08: dffffc0000000000 R09: fffffbfff198cef5
R10: fffffbfff198cef5 R11: 1ffffffff198cef4 R12: ffffffff8cc677b0
R13: ffffffff8cc677a8 R14: 1ffffffff198cef6 R15: 1ffffffff198cef5
FS:  00007fc43aed46c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feb05b156c0 CR3: 00000000235ea000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
 atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:542 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:111 [inline]
 do_raw_spin_lock+0x11d/0x280 kernel/locking/spinlock_debug.c:115
 spin_lock include/linux/spinlock.h:351 [inline]
 locks_delete_block+0x7a/0x300 fs/locks.c:723
 locks_lock_inode_wait+0x3d6/0x460 fs/locks.c:-1
 locks_lock_file_wait include/linux/fs.h:1365 [inline]
 __do_sys_flock fs/locks.c:2131 [inline]
 __se_sys_flock+0x44d/0x530 fs/locks.c:2085
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc439f8eec9
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:00007fc43aed4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000049
RAX: ffffffffffffffda RBX: 00007fc43a1e5fa0 RCX: 00007fc439f8eec9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000004
RBP: 00007fc43a011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc43a1e6038 R14: 00007fc43a1e5fa0 R15: 00007ffef9230048
 </TASK>