rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5608/1:b..l..
rcu: 	(detected by 0, t=10502 jiffies, g=31509, q=204 ncpus=2)
task:syz-executor    state:D stack:21824 pid:5608  tgid:5608  ppid:5600   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule_rtlock+0x30/0x70 kernel/sched/core.c:7538
 rtlock_slowlock_locked+0x35c9/0x3c20 kernel/locking/rtmutex.c:1895
 rtlock_slowlock kernel/locking/rtmutex.c:1922 [inline]
 rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
 __rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
 rt_spin_lock+0x165/0x400 kernel/locking/spinlock_rt.c:57
 spin_lock_bh include/linux/spinlock_rt.h:90 [inline]
 hrtimer_cancel_wait_running+0xd0/0x160 kernel/time/hrtimer.c:1761
 hrtimer_cancel kernel/time/hrtimer.c:1788 [inline]
 do_nanosleep+0x2bc/0x790 kernel/time/hrtimer.c:2439
 hrtimer_nanosleep+0x1f1/0x430 kernel/time/hrtimer.c:2483
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1420 [inline]
 __se_sys_clock_nanosleep+0x35b/0x3b0 kernel/time/posix-timers.c:1397
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcfa581fd8e
RSP: 002b:00007ffe3a65d248 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 000055556a322500 RCX: 00007fcfa581fd8e
RDX: 00007ffe3a65d2a0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffe3a65d30c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000001388
R13: 00000000000927c0 R14: 00000000000855b5 R15: 00007ffe3a65d360
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10407 jiffies! g31509 f0x0 RCU_GP_WAIT_FQS(5) ->state=I
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=15668
rcu: rcu_preempt kthread starved for 10408 jiffies! g31509 f0x0 RCU_GP_WAIT_FQS(5) ->state=I ->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:I stack:27208 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x171d/0x56e0 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x1230 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x9c/0x340 kernel/rcu/tree.c:2330
 kthread+0x38b/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8399 Comm: iou-sqp-8398 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947
Code: ff ff ff e8 00 cf cf 09 f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 e2 e8 2c 12 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 7f b1 d3 09 cc 48 8d 3d 57 5a 35
RSP: 0018:ffffc90004d279c0 EFLAGS: 00000296
RAX: 869938496b66bf00 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 0000000016ea13ce RSI: ffffffff8dd6ac9c RDI: ffffffff8bed1980
RBP: ffff8880304a1f40 R08: ffffffff8b74fee2 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff21aa318 R12: ffffffff8f3c1640
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246
FS:  00007fcfa3a746c0(0000) GS:ffff888124825000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb04d1b07b0 CR3: 000000005f168000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 rcu_read_lock include/linux/rcupdate.h:849 [inline]
 __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
 rt_spin_lock+0x1fe/0x400 kernel/locking/spinlock_rt.c:57
 spin_lock include/linux/spinlock_rt.h:45 [inline]
 kcov_remote_stop+0x29f/0x680 kernel/kcov.c:1090
 io_sq_thread+0xd97/0x1eb0 io_uring/sqpoll.c:343
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>