rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=19033, q=790 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294960628-4294950126), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g19033 f0x2 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:27232 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5349 [inline]
 __schedule+0x1665/0x5590 kernel/sched/core.c:6961
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7289
 irqentry_exit+0x5e4/0x700 kernel/entry/common.c:240
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:timer_destroy_on_stack+0x5/0x20 kernel/time/timer.c:822
Code: e1 07 80 c1 03 38 c1 7c b4 e8 97 b0 7e 00 eb ad 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 53 <48> 89 fb e8 d3 f8 13 00 48 89 df 48 c7 c6 e0 44 ef 8b 5b e9 33 f9
RSP: 0018:ffffc90000157ab0 EFLAGS: 00000286
RAX: 0000000000000000 RBX: 00000000ffffbcef RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8e22d498 RDI: ffffc90000157b00
RBP: ffffc90000157bd0 R08: ffffffff9053fbf7 R09: 1ffffffff20a7f7e
R10: dffffc0000000000 R11: fffffbfff20a7f7f R12: 1ffff9200002af5c
R13: ffffc90000157b00 R14: 1ffffffff1d02250 R15: dffffc0000000000
 schedule_timeout+0x168/0x2c0 kernel/time/sleep_timeout.c:103
 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6486 Comm: syz.1.31 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:lock_acquire+0xdc/0x2e0 kernel/locking/lockdep.c:5868
Code: 24 8e e8 17 0a 1d 0a 65 ff 05 50 00 c1 11 45 31 c9 f7 c3 00 02 00 00 41 0f 94 c1 4c 89 ef 8b 74 24 04 89 ea 44 89 e1 45 89 f8 <6a> 00 6a 00 6a 00 ff b4 24 88 00 00 00 41 56 e8 80 02 00 00 48 83
RSP: 0000:ffffc900037ef890 EFLAGS: 00000006
RAX: 0000000000000000 RBX: 0000000000000246 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880605b9cc0
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc900037ef9f0 R11: fffff520006fdf42 R12: 0000000000000001
R13: ffff8880605b9cc0 R14: 0000000000000000 R15: 0000000000000001
FS:  00007fd868fc76c0(0000) GS:ffff888124de6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 0000000076824000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __might_fault+0xcb/0x130 mm/memory.c:7199
 __copy_to_user include/linux/uaccess.h:151 [inline]
 save_xstate_epilog arch/x86/kernel/fpu/signal.c:121 [inline]
 copy_fpstate_to_sigframe+0xb45/0xd90 arch/x86/kernel/fpu/signal.c:232
 get_sigframe+0x5f7/0x820 arch/x86/kernel/signal.c:163
 x64_setup_rt_frame+0x160/0xcb0 arch/x86/kernel/signal_64.c:175
 setup_rt_frame arch/x86/kernel/signal.c:250 [inline]
 handle_signal arch/x86/kernel/signal.c:294 [inline]
 arch_do_signal_or_restart+0x424/0x830 arch/x86/kernel/signal.c:339
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:98 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:283 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:352 [inline]
 irqentry_exit+0x188/0x700 kernel/entry/common.c:219
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0033:0x7fd86819c627
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:00007fd868fc70e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007fd868415fa8 RCX: 00007fd86819c629
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd868415fa8
RBP: 00007fd868415fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd868416038 R14: 00007ffde66343d0 R15: 00007ffde66344b8
 </TASK>