rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 ticks this GP) idle=730c/1/0x4000000000000000 softirq=14559/14559 fqs=0
rcu: 	(detected by 1, t=10505 jiffies, g=10613, q=1671 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6120 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
RIP: 0010:rcu_is_watching+0x55/0xb0 kernel/rcu/tree.c:751
Code: dd de 8d 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 3c 00 7e 00 48 c7 c3 d8 5f c5 92 49 03 1e 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 34 8b 03 65 ff 0d e9 b7 1d 11 74 11 83 e0
RSP: 0018:ffffc90000007c50 EFLAGS: 00000802
RAX: 1ffff110170c65fb RBX: ffff8880b8632fd8 RCX: a24319b09da86800
RDX: ffff888026b93c80 RSI: ffffffff8c03aac0 RDI: ffffffff8c03aa80
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff89a2ef08
R10: dffffc0000000000 R11: ffffed100fb77c5e R12: ffff88807dbbe360
R13: ffff88807dbbe000 R14: ffffffff8ddeddd0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881259dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1e84d45286 CR3: 000000007bcce000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 rcu_read_lock include/linux/rcupdate.h:842 [inline]
 advance_sched+0xa31/0xc90 net/sched/sch_taprio.c:990
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 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:lock_release+0x2b5/0x3e0 kernel/locking/lockdep.c:5893
Code: 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 0b 9f 26 11 <48> 3b 44 24 28 0f 85 8b 00 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc900048eec70 EFLAGS: 00000206
RAX: a24319b09da86800 RBX: 0000000000000206 RCX: a24319b09da86800
RDX: 0000000000000004 RSI: ffffffff8ddb5693 RDI: ffffffff8c03aae0
RBP: ffff888026b94850 R08: ffffc900048eee07 R09: 0000000000000000
R10: ffffc900048eedf8 R11: fffff5200091ddc1 R12: 0000000000000004
R13: 0000000000000004 R14: ffffffff8e33d360 R15: ffff888026b93c80
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock include/linux/rcupdate.h:871 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1169 [inline]
 unwind_next_frame+0x19a9/0x2390 arch/x86/kernel/unwind_orc.c:680
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 unpoison_slab_object mm/kasan/common.c:342 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:368
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4945 [inline]
 slab_alloc_node mm/slub.c:5244 [inline]
 kmem_cache_alloc_noprof+0x367/0x6e0 mm/slub.c:5251
 kmem_alloc_batch lib/debugobjects.c:371 [inline]
 fill_pool+0x100/0x570 lib/debugobjects.c:403
 debug_objects_fill_pool lib/debugobjects.c:725 [inline]
 debug_object_activate+0x383/0x420 lib/debugobjects.c:814
 debug_rcu_head_queue kernel/rcu/rcu.h:236 [inline]
 __call_rcu_common kernel/rcu/tree.c:3108 [inline]
 call_rcu+0xaa/0x9c0 kernel/rcu/tree.c:3243
 slab_free_hook mm/slub.c:2471 [inline]
 slab_free mm/slub.c:6557 [inline]
 kmem_cache_free+0x4b5/0x690 mm/slub.c:6668
 anon_vma_free mm/rmap.c:136 [inline]
 __put_anon_vma+0x12b/0x2d0 mm/rmap.c:2764
 put_anon_vma include/linux/rmap.h:117 [inline]
 unlink_anon_vmas+0x503/0x670 mm/rmap.c:443
 free_pgtables+0x72b/0x9c0 mm/memory.c:413
 exit_mmap+0x43c/0xb40 mm/mmap.c:1291
 __mmput+0x118/0x430 kernel/fork.c:1148
 exec_mmap+0x6ac/0x7d0 fs/exec.c:901
 begin_new_exec+0x12d6/0x2160 fs/exec.c:1156
 load_elf_binary+0x998/0x2740 fs/binfmt_elf.c:1010
 search_binary_handler fs/exec.c:1670 [inline]
 exec_binprm fs/exec.c:1702 [inline]
 bprm_execve+0x99c/0x1450 fs/exec.c:1754
 do_execveat_common+0x510/0x6a0 fs/exec.c:1860
 do_execve fs/exec.c:1934 [inline]
 __do_sys_execve fs/exec.c:2010 [inline]
 __se_sys_execve fs/exec.c:2005 [inline]
 __x64_sys_execve+0x94/0xb0 fs/exec.c:2005
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1e84c8b107
Code: Unable to access opcode bytes at 0x7f1e84c8b0dd.
RSP: 002b:00007ffdbcac1258 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 0000556617f83078 RCX: 00007f1e84c8b107
RDX: 0000556617f830a0 RSI: 0000556617f83078 RDI: 0000556617f83130
RBP: 0000556617f83130 R08: 00007ffdbcac5eac R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 0000556617f830a0
R13: 00007f1e84e50e8b R14: 0000556617f830a0 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10504 jiffies! g10613 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=5538
rcu: rcu_preempt kthread starved for 10505 jiffies! g10613 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27224 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5360 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6964
 __schedule_loop kernel/sched/core.c:7046 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7061
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>