rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=094c/1/0x4000000000000000 softirq=11186/11191 fqs=50
	(t=10501 jiffies g=11513 q=1860 ncpus=2)
rcu: rcu_preempt kthread starved for 10398 jiffies! g11513 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: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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4618 Comm: syz.4.21 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:common_interrupt_return+0x1b/0x5d arch/x86/entry/entry_64.S:617
Code: e8 ca e4 ed ff e9 f5 02 00 00 0f 1f 44 00 00 66 90 b9 48 00 00 00 65 48 8b 14 25 68 6f 02 00 83 e2 fe 89 d0 48 c1 ea 20 0f 30 <41> 5f 41 5e 41 5d 41 5c 5d 5b 41 5b 41 5a 41 59 41 58 58 59 5a 5e
RSP: 0018:ffffc90003717f58 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000048
RDX: 0000000000000000 RSI: ffffffff8a8c1120 RDI: ffffffff8adf13a0
RBP: 0000000000000000 R08: ffffffff8e1ff42f R09: 1ffffffff1c3fe85
R10: dffffc0000000000 R11: 00007f879f850780 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  000055556166b500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2eb63fff CR3: 000000005609f000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
RIP: 0033:0x7f879f850780
Code: 44 24 20 0f 29 44 24 30 0f 29 44 24 40 48 8b 44 24 08 ff d0 48 83 c4 50 31 c0 5b 5d 41 5c 41 5d 41 5e c3 0f 1f 80 00 00 00 00 <c3> 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 c3 66 66 2e 0f 1f
RSP: 002b:00007ffc57e353b8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f879fc15fa0 RCX: 00007f879fc15fa0
RDX: 00007ffc57e353c0 RSI: 00007ffc57e354f0 RDI: 0000000000000011
RBP: 00007f879fa32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f879fc15fac R14: 00007f879fc15fa0 R15: 00007f879fc15fa0
 </TASK>
CPU: 0 PID: 4612 Comm: syz.3.28 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: 00 00 00 66 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 0e b0 2c f7 48 89 df e8 56 78 2d f7 e8 21 cf 50 f7 fb bf 01 00 00 00 <e8> a6 dc 20 f7 65 8b 05 f7 5f ca 75 85 c0 74 02 5b c3 e8 44 74 c8
RSP: 0018:ffffc90003697cf0 EFLAGS: 00000286
RAX: 500ed92a8783ec00 RBX: ffff888057f5ae40 RCX: 500ed92a8783ec00
RDX: dffffc0000000000 RSI: ffffffff8a8c1120 RDI: 0000000000000001
RBP: ffffc90003697f10 R08: ffff888057f5ae43 R09: 1ffff1100afeb5c8
R10: dffffc0000000000 R11: ffffed100afeb5c9 R12: 1ffff920006d2fa8
R13: dffffc0000000000 R14: 00007ffd91eea0b8 R15: ffff8880764ed940
FS:  000055558242b500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e963fff CR3: 0000000056358000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __ia32_sys_rt_sigreturn+0x1ad/0x760 arch/x86/kernel/signal.c:673
 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: 0033:0x7f546433db99
Code: 11 06 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 0c 25
RSP: 002b:00007ffd91eea0c0 EFLAGS: 00000207 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f546433db99
RDX: 00007ffd91eea0c0 RSI: 00007ffd91eea1f0 RDI: 0000000000000011
RBP: 00007f5464432c91 R08: 00000000000000ab R09: 00287ff2f51a3622
R10: 0000005a04ed8839 R11: 0000000000000207 R12: 0000000000000000
R13: 00007f5464615fac R14: 00007f5464615fa0 R15: 00007f5464615fa0
 </TASK>
sched: RT throttling activated