rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10563 ticks this GP) idle=e83c/1/0x4000000000000000 softirq=49344/49346 fqs=7
	(t=10500 jiffies g=58473 q=7 ncpus=2)
rcu: rcu_preempt kthread starved for 10486 jiffies! g58473 f0x0 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:27184 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x11d1/0x40e0 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+0x303/0x1340 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 0 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:741
CPU: 1 PID: 11164 Comm: syz.6.1395 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:212
Code: 2e 0f 1f 84 00 00 00 00 00 90 53 48 89 fb e8 17 00 00 00 48 8b 3d f0 52 9d 0c 48 89 de 5b e9 67 21 50 00 00 00 cc cc 00 00 cc <48> 8b 04 24 65 48 8b 0d c4 fc 7f 7e 65 8b 15 c5 fc 7f 7e 81 e2 00
RSP: 0018:ffffc90004187b38 EFLAGS: 00000246
RAX: ffffffff812fe2b8 RBX: 0000000000000007 RCX: 0000000000080000
RDX: ffffc9000f7eb000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90004187cf0 R08: 0000000000000000 R09: 1ffff92000830f8f
R10: dffffc0000000000 R11: fffff52000830f90 R12: 1ffff92000830f74
R13: 1ffff110049fd6da R14: 00007fbe8d411c40 R15: 1ffff110049fd6a6
FS:  00007fbe8d4126c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9f3ed840c0 CR3: 000000005fabc000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 xrstor_from_user_sigframe arch/x86/kernel/fpu/xstate.h:301 [inline]
 __restore_fpregs_from_user arch/x86/kernel/fpu/signal.c:259 [inline]
 restore_fpregs_from_user arch/x86/kernel/fpu/signal.c:289 [inline]
 __fpu_restore_sig arch/x86/kernel/fpu/signal.c:359 [inline]
 fpu__restore_sig+0x5b8/0x1290 arch/x86/kernel/fpu/signal.c:493
 restore_sigcontext arch/x86/kernel/signal.c:140 [inline]
 __ia32_sys_rt_sigreturn+0x5e4/0x760 arch/x86/kernel/signal.c:675
 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: 0033:0x7fbe8c59aeb7
Code: 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 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 e8 ff ff ff f7 d8 64 89
RSP: 002b:00007fbe8d412028 EFLAGS: 00000246
RAX: 0000000000000048 RBX: 00007fbe8c815fa0 RCX: 00007fbe8c59aeb9
RDX: 0000200000000280 RSI: 0000000000000026 RDI: 0000000000000003
RBP: 00007fbe8c608c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbe8c816038 R14: 00007fbe8c815fa0 R15: 00007ffff87d7ae8
 </TASK>