rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10499 ticks this GP) idle=018c/1/0x4000000000000000 softirq=8181/8181 fqs=3
	(t=10501 jiffies g=6733 q=84 ncpus=2)
rcu: rcu_preempt kthread starved for 10495 jiffies! g6733 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:27464 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 schedule+0xb9/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x95/0x380 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: 4299 Comm: syz-executor117 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__lock_release kernel/locking/lockdep.c:5367 [inline]
RIP: 0010:lock_release+0x30d/0x910 kernel/locking/lockdep.c:5682
Code: 74 24 08 74 0e 4c 89 e7 48 89 d3 e8 bd 79 6d 00 48 89 da 49 8b 1c 24 49 81 c6 d0 0a 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 <74> 0e 4c 89 f7 49 89 d4 e8 16 7a 6d 00 4c 89 e2 49 89 1e 3b 54 24
RSP: 0018:ffffc90003f27bc0 EFLAGS: 00000046
RAX: 1ffff11005bfdc82 RBX: ffffffffffffffff RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffff88802e1b5c98 RDI: ffff88802dfee420
RBP: ffffc90003f27ce0 R08: dffffc0000000000 R09: fffffbfff1c3eee6
R10: fffffbfff1c3eee6 R11: 1ffffffff1c3eee5 R12: ffff88802dfee420
R13: dffffc0000000000 R14: ffff88802dfee410 R15: 1ffff920007e4f84
FS:  000055556db9b3c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9ad0d56be0 CR3: 000000007e062000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:157 [inline]
 _raw_spin_unlock_irq+0x12/0x40 kernel/locking/spinlock.c:202
 __ia32_sys_rt_sigreturn+0x184/0x790 arch/x86/kernel/signal.c:673
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9ad0d56be9
Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 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 04 25
RSP: 002b:00007fffe594a480 EFLAGS: 00000202 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 000000000000000f RCX: 00007f9ad0d56be9
RDX: 00007fffe594a480 RSI: 00007fffe594a5b0 RDI: 0000000000000021
RBP: 0000000000000000 R08: 00007f9ad0cf7990 R09: 00007f9ad0cf7990
R10: 0000000000000000 R11: 0000000000000202 R12: 00007f9ad0d8f178
R13: 00007f9ad0d95e3c R14: 00007fffe594aa90 R15: 0000000000000000
 </TASK>
CPU: 0 PID: 4298 Comm: syz-executor117 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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: f5 ff 0f 1f 00 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ee f7 41 f7 48 89 df e8 46 bd 42 f7 e8 71 af 65 f7 fb bf 01 00 00 00 <e8> 96 3a 36 f7 65 8b 05 97 f3 e0 75 85 c0 74 02 5b c3 e8 e4 04 df
RSP: 0018:ffffc90003f37bb8 EFLAGS: 00000286
RAX: 022ee67f82ca4400 RBX: ffff88802dff5c80 RCX: 022ee67f82ca4400
RDX: dffffc0000000000 RSI: ffffffff8a8c0500 RDI: 0000000000000001
RBP: ffff88802dff6118 R08: dffffc0000000000 R09: ffffed1005bfeb91
R10: ffffed1005bfeb91 R11: 1ffff11005bfeb90 R12: 1ffff11005bfec23
R13: 0000000000000021 R14: dffffc0000000000 R15: 0000000000000000
FS:  000055556db9b3c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9ad0d56be0 CR3: 0000000072b12000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 get_signal+0x1163/0x1350 kernel/signal.c:2874
 arch_do_signal_or_restart+0xb0/0x1230 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9ad0d3f289
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 1b 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffe594aa58 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f9ad0d3f289
RDX: 000020000006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00007f9ad0cf7990 R09: 00007f9ad0cf7990
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9ad0d8f178
R13: 00007f9ad0d95e3c R14: 00007fffe594aa90 R15: 0000000000000000
 </TASK>