rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10503 jiffies, g=16889, q=1845 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294967863-4294957360), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10503 jiffies! g16889 f0x2 RCU_GP_WAIT_FQS(5) ->state=R ->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:27496 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7376
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2330
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 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: 6030 Comm: modprobe Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:task_wait_context kernel/locking/lockdep.c:4830 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4919 [inline]
RIP: 0010:__lock_acquire+0xa56/0x2de0 kernel/locking/lockdep.c:5238
Code: 47 84 ff 48 c7 c7 3c 19 4f 8e e8 b5 6b 84 ff e8 f0 6a 8f ff e8 eb b7 03 00 e9 84 0a 00 00 41 83 be 90 0b 00 00 00 41 0f 94 c4 <41> 80 f4 03 41 3b 9e a0 0b 00 00 0f 8d fc fb ff ff e9 04 fb ff ff
RSP: 0018:ffffc90000a18bc8 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 00000000000e4075
RDX: 0000000000000002 RSI: 0000000000004000 RDI: 6c00000000000000
RBP: ffff888030be8bd8 R08: ffffffff81b44ef6 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff20f4c90 R12: ffffffffffffff01
R13: 0000000000000000 R14: ffff888030be8000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888124dc7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f39bf5eee9c CR3: 000000000eb48000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:165 [inline]
 _raw_spin_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:189
 __run_hrtimer kernel/time/hrtimer.c:2078 [inline]
 __hrtimer_run_queues+0x466/0xa10 kernel/time/hrtimer.c:2131
 hrtimer_interrupt+0x4cd/0xaa0 kernel/time/hrtimer.c:2250
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947
Code: ff ff ff e8 b0 9d 43 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 42 48 f2 11 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 87 56 da
RSP: 0018:ffffc9000207f7a0 EFLAGS: 00000296
RAX: 976b49c6d143c700 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 00000000105209fd RSI: ffffffff8e69f4bd RDI: ffffffff8c6dad80
RBP: ffff888030be8000 R08: ffffffff8177f1df R09: 0000000000000000
R10: ffffc9000207f8d8 R11: ffffffff81b2a310 R12: ffffffff8ed5c8a0
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 rcu_read_lock include/linux/rcupdate.h:849 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
 unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
 slab_free_hook mm/slub.c:2709 [inline]
 slab_free mm/slub.c:6508 [inline]
 kmem_cache_free+0x45e/0x650 mm/slub.c:6635
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x73a/0x2360 kernel/exit.c:986
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1129
 __do_sys_exit_group kernel/exit.c:1140 [inline]
 __se_sys_exit_group kernel/exit.c:1138 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1138
 x64_sys_call+0x18c6/0x18d0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f39bf74d6c5
Code: Unable to access opcode bytes at 0x7f39bf74d69b.
RSP: 002b:00007ffd7e05fd08 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f39bf84efe8 RCX: 00007f39bf74d6c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000001
RBP: 0000000000000001 R08: 00007ffd7e05fc98 R09: 0000000000000000
R10: 00007ffd7e05fb30 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f39bf84d680 R15: 00007f39bf84f000
 </TASK>