rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=a2a4/1/0x4000000000000000 softirq=53035/53036 fqs=38
rcu: 	(t=10500 jiffies g=36061 q=146 ncpus=2)
rcu: rcu_preempt kthread starved for 9996 jiffies! g36061 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:28336 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1190/0x5de0 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:7026
 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </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 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:158 [inline]
RIP: 0010:lock_acquire kernel/locking/lockdep.c:5871 [inline]
RIP: 0010:lock_acquire+0x1af/0x350 kernel/locking/lockdep.c:5825
Code: e7 80 cd 09 b8 ff ff ff ff 65 0f c1 05 52 c7 0b 12 83 f8 01 0f 85 6a 01 00 00 9c 58 f6 c4 02 0f 85 7f 01 00 00 48 83 3c 24 00 <0f> 84 ad fe ff ff fb e9 a7 fe ff ff 65 8b 05 26 c7 0b 12 85 c0 0f
RSP: 0018:ffffc90000a08f08 EFLAGS: 00000046
RAX: 0000000000000046 RBX: ffffffff9ab44a48 RCX: ffffffff93b6b2a0
RDX: 0000000000000000 RSI: ffffffff8dade58a RDI: ffffffff8bf1ea40
RBP: 0000000000000002 R08: ae28e0c9515e7135 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888124ad6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560304f1abe0 CR3: 000000000e182000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 seqcount_lockdep_reader_access include/linux/seqlock.h:72 [inline]
 ktime_get+0x80/0x310 kernel/time/timekeeping.c:824
 tick_nohz_irq_enter kernel/time/tick-sched.c:1526 [inline]
 tick_irq_enter+0x9b/0x240 kernel/time/tick-sched.c:1554
 irq_enter_rcu+0xca/0xe0 kernel/softirq.c:668
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: 97 74 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 43 95 23 00 fb f4 <e9> 3c 0a 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000197de8 EFLAGS: 000002c6
RAX: 0000000002756c29 RBX: 0000000000000001 RCX: ffffffff8b6692a9
RDX: 0000000000000000 RSI: ffffffff8db03f46 RDI: ffffffff8bf1ea40
RBP: ffffed1003b53490 R08: 0000000000000001 R09: ffffed10170a6655
R10: ffff8880b85332ab R11: 0000000000000001 R12: 0000000000000001
R13: ffff88801da9a480 R14: ffffffff908339d0 R15: 0000000000000000
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:767
 default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:190 [inline]
 do_idle+0x38d/0x500 kernel/sched/idle.c:330
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:428
 start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:315
 common_startup_64+0x13e/0x148
 </TASK>
CPU: 0 UID: 0 PID: 1296 Comm: aoe_tx0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 a6 d7 2f f6 48 89 df e8 8e 2b 30 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 45 36 20 f6 65 8b 05 7e 65 3b 08 85 c0 74 16 5b
RSP: 0018:ffffc9000465f958 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffffff9ae0b320 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff8db03f46 RDI: ffffffff8bf1ea40
RBP: 0000000000000293 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff908339d7 R11: 0000000000000001 R12: ffffffff8f073d60
R13: ffffffff9ae0b428 R14: 0000000000000000 R15: ffffffff9ae0b460
FS:  0000000000000000(0000) GS:ffff8881249d6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f82a9d156c0 CR3: 000000005c7f6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 uart_port_unlock_irqrestore include/linux/serial_core.h:788 [inline]
 uart_port_unlock_deref drivers/tty/serial/serial_core.c:91 [inline]
 uart_port_unlock_deref drivers/tty/serial/serial_core.c:88 [inline]
 uart_write_room+0x2d9/0x940 drivers/tty/serial/serial_core.c:647
 tty_write_room+0x66/0x90 drivers/tty/tty_ioctl.c:69
 handle_tx+0x14f/0x630 drivers/net/caif/caif_serial.c:212
 __netdev_start_xmit include/linux/netdevice.h:5248 [inline]
 netdev_start_xmit include/linux/netdevice.h:5257 [inline]
 xmit_one net/core/dev.c:3845 [inline]
 dev_hard_start_xmit+0x97/0x740 net/core/dev.c:3861
 __dev_queue_xmit+0xa46/0x4490 net/core/dev.c:4763
 dev_queue_xmit include/linux/netdevice.h:3365 [inline]
 tx+0xcc/0x190 drivers/block/aoe/aoenet.c:62
 kthread+0x1e4/0x3e0 drivers/block/aoe/aoecmd.c:1241
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
vkms_vblank_simulate: vblank timer overrun