rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 1, t=10502 jiffies, g=8357, q=43 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294955977-4294945474), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10504 jiffies! g8357 f0x2 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:27888 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x107f/0x4030 kernel/sched/core.c:6562
 schedule+0xb9/0x180 kernel/sched/core.c:6638
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
 rcu_gp_fqs_loop+0x303/0x1350 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x99/0x3b0 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:
CPU: 1 PID: 4302 Comm: syz-executor223 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__might_sleep+0x0/0xd0 kernel/sched/core.c:9885
Code: 7e fe ff ff 89 d9 80 e1 07 38 c1 0f 8c 93 fe ff ff 48 89 df e8 c1 ea 78 00 e9 86 fe ff ff 66 2e 0f 1f 84 00 00 00 00 00 66 90 <55> 41 57 41 56 41 54 53 49 bf 00 00 00 00 00 fc ff df 65 48 8b 1d
RSP: 0018:ffffc90004267b50 EFLAGS: 00000246
RAX: ffffffff81c0587e RBX: ffff888030513c00 RCX: 0000000000000000
RDX: ffff888030513c00 RSI: 000000000000000e RDI: ffffffff8ade9fc0
RBP: 000000000000000e R08: ffffc90004267c57 R09: ffffc90004267c40
R10: dffffc0000000000 R11: fffff5200084cf8b R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff8ade9fc0 R15: 0000000000000000
FS:  0000555591555480(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 000000002dca7000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __might_fault+0x6d/0x120 mm/memory.c:5848
 _copy_from_user+0x27/0x170 lib/usercopy.c:14
 copy_from_user include/linux/uaccess.h:161 [inline]
 restore_altstack+0xab/0x4e0 kernel/signal.c:4258
 __ia32_sys_rt_sigreturn+0x624/0x750 arch/x86/kernel/signal.c:678
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff696b44b49
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 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 d0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff91b65f18 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007ff696b44b49
RDX: 000020000006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00007ff696bbf06d R09: 00007ff696bbf06d
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff696bbf06d
R13: 00007fff91b65f60 R14: 00007fff91b65fa0 R15: 0000000000000000
 </TASK>