rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=6797, q=56 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294963940-4294953438), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g6797 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:27696 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0xf12/0x5c00 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6817
 schedule_timeout+0x137/0x290 kernel/time/timer.c:2183
 rcu_gp_fqs_loop+0x1ec/0xb10 kernel/rcu/tree.c:1631
 rcu_gp_kthread+0x24b/0x380 kernel/rcu/tree.c:1830
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </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 PID: 5181 Comm: syz-executor324 Not tainted 6.8.0-rc1-syzkaller-00037-g443b349019f2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:__sanitizer_cov_trace_pc+0x34/0x60 kernel/kcov.c:207
Code: c2 03 00 65 8b 05 14 a0 7b 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 35 8b 82 fc 15 00 00 85 c0 74 2b 8b 82 d8 15 00 00 <83> f8 02 75 20 48 8b 8a e0 15 00 00 8b 92 dc 15 00 00 48 8b 01 48
RSP: 0018:ffffc90004497748 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffc90004497818 RCX: ffffffff813a4336
RDX: ffff888027dc0000 RSI: ffffffff813a4340 RDI: 0000000000000005
RBP: ffffc90004497f58 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffc90004497820
R13: ffffc90004497828 R14: ffffc90004490000 R15: 0000000000000001
FS:  00005555568fa3c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001700 CR3: 000000007282f000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 on_stack arch/x86/include/asm/stacktrace.h:58 [inline]
 stack_access_ok+0xa0/0x270 arch/x86/kernel/unwind_orc.c:393
 deref_stack_regs arch/x86/kernel/unwind_orc.c:418 [inline]
 unwind_next_frame+0x13b9/0x2390 arch/x86/kernel/unwind_orc.c:596
 arch_stack_walk+0xfa/0x170 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x96/0xd0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3f/0x60 mm/kasan/generic.c:640
 poison_slab_object mm/kasan/common.c:241 [inline]
 __kasan_slab_free+0x121/0x1b0 mm/kasan/common.c:257
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2121 [inline]
 slab_free mm/slub.c:4299 [inline]
 kmem_cache_free+0x129/0x350 mm/slub.c:4363
 __sigqueue_free kernel/signal.c:450 [inline]
 __sigqueue_free kernel/signal.c:442 [inline]
 collect_signal+0x315/0x630 kernel/signal.c:593
 __dequeue_signal kernel/signal.c:615 [inline]
 dequeue_signal+0x22a/0x660 kernel/signal.c:635
 get_signal+0x5d8/0x2790 kernel/signal.c:2773
 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0x156/0x2b0 kernel/entry/common.c:212
 do_syscall_64+0xe0/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f9a52b726c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 19 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:00007ffefda78e28 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f9a52b726c9
RDX: 00007f9a52b726c9 RSI: 0000000000000000 RDI: 0000000020000400
RBP: 0000000000000000 R08: 00007f9a52a00990 R09: 00007f9a52a00990
R10: 00007f9a52a00990 R11: 0000000000000246 R12: 00007ffefda78e4c
R13: 00007ffefda78e80 R14: 00007ffefda78e60 R15: 000000000000000b
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.077 msecs