rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6599/1:b.el
rcu: 	(detected by 1, t=11214 jiffies, g=17241, q=1745 ncpus=2)
task:udevd           state:R  running task     stack:27144 pid:6599  tgid:6599  ppid:5204   task_flags:0x400140 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6965
 preempt_schedule+0xae/0xc0 kernel/sched/core.c:6989
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 wp_page_copy mm/memory.c:3670 [inline]
 do_wp_page+0x1d1d/0x5800 mm/memory.c:4030
 handle_pte_fault mm/memory.c:6085 [inline]
 __handle_mm_fault+0x1144/0x5620 mm/memory.c:6212
 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6381
 do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f82530b5b69
RSP: 002b:00007fff86392e80 EFLAGS: 00010202
RAX: 00007f82531f20e0 RBX: 000055fce35c10c0 RCX: 000055fce35c10c0
RDX: 000055fce35c10c0 RSI: 00007f82531f20e0 RDI: 000055fce35c10c0
RBP: 00007f82531f1ac0 R08: 0000000000002760 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00000000000032b0
R13: 000055fce35c4370 R14: 00000000000021c0 R15: 00007f82531f1ac0
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 2663 jiffies! g17241 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=5218
rcu: rcu_preempt kthread starved for 2664 jiffies! g17241 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:27128 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
 __schedule_loop kernel/sched/core.c:6863 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6878
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 6422 Comm: syz-execprog Not tainted 6.16.0-rc4-syzkaller-gb4911fb0b060 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0033:0x474c83
Code: 48 83 c4 28 5d c3 48 8b 72 68 4c 29 c0 8b 4a 5c 48 0f af c8 48 c1 e9 20 48 0f af f1 4a 8d 04 06 90 48 89 d3 48 83 c4 28 5d c3 <48> ba ad de ad de ad de ad de 48 39 d0 75 19 83 3d af 33 8b 03 00
RSP: 002b:000000c0000b7e48 EFLAGS: 00000246
RAX: 000000000176dc20 RBX: 000000c0007d8000 RCX: 0000000000000768
RDX: 0000000000000000 RSI: 00007ff1c4c00000 RDI: 00000000012c2c40
RBP: 000000c0000b7e70 R08: 000000c0007d8000 R09: ffffff4000f95c20
R10: 0000000000000768 R11: 000000000176dc20 R12: 000000c0000b7f00
R13: 0000000000000000 R14: 000000c0000036c0 R15: 0000000000000001
FS:  000000c00007f898 GS:  0000000000000000