rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P12649/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=52333, q=460 ncpus=2)
task:dhcpcd-run-hook state:R  running task     stack:27496 pid:12649 tgid:12649 ppid:12612  task_flags:0x400040 flags:0x00080800
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5260 [inline]
 __schedule+0x1138/0x5ee0 kernel/sched/core.c:6867
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7194
 irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__read_once_word_nocheck+0x3/0x10 include/asm-generic/rwonce.h:68
Code: c7 c7 b8 80 8a 8b e8 cc 1f bc 00 e9 e8 fb ff ff 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 07 <c3> cc cc cc cc 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90004407320 EFLAGS: 00000202
RAX: ffff888076209be8 RBX: 0000000000000001 RCX: ffffc90004408000
RDX: ffffc90004407b01 RSI: ffffc90004407af8 RDI: ffffc90004407af8
RBP: ffffc90004407af8 R08: 0000000000000001 R09: 00000000dedbec07
R10: 0000000000000002 R11: 0000000000011104 R12: ffffc900044073e8
R13: ffffc90004407398 R14: ffffc90004407b28 R15: ffffc900044073cc
 deref_stack_reg arch/x86/kernel/unwind_orc.c:422 [inline]
 unwind_next_frame+0x1519/0x20b0 arch/x86/kernel/unwind_orc.c:663
 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
 kmalloc_noprof include/linux/slab.h:957 [inline]
 slab_free_hook mm/slub.c:2492 [inline]
 slab_free mm/slub.c:6670 [inline]
 kmem_cache_free+0x147/0x770 mm/slub.c:6781
 anon_vma_free mm/rmap.c:136 [inline]
 __put_anon_vma+0x114/0x3a0 mm/rmap.c:2780
 put_anon_vma include/linux/rmap.h:117 [inline]
 unlink_anon_vmas+0x58a/0x820 mm/rmap.c:443
 free_pgtables+0x212/0xc10 mm/memory.c:414
 exit_mmap+0x3f1/0xb60 mm/mmap.c:1288
 __mmput+0x12a/0x410 kernel/fork.c:1173
 mmput+0x62/0x70 kernel/fork.c:1196
 exec_mmap fs/exec.c:901 [inline]
 begin_new_exec+0x1280/0x3770 fs/exec.c:1156
 load_elf_binary+0x8e7/0x4fe0 fs/binfmt_elf.c:1010
 search_binary_handler fs/exec.c:1669 [inline]
 exec_binprm fs/exec.c:1701 [inline]
 bprm_execve fs/exec.c:1753 [inline]
 bprm_execve+0x8c2/0x1620 fs/exec.c:1729
 do_execveat_common.isra.0+0x4a5/0x610 fs/exec.c:1859
 do_execve fs/exec.c:1933 [inline]
 __do_sys_execve fs/exec.c:2009 [inline]
 __se_sys_execve fs/exec.c:2004 [inline]
 __x64_sys_execve+0x8e/0xb0 fs/exec.c:2004
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f00d78f7107
RSP: 002b:00007ffe69396548 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 000055c2224dfe88 RCX: 00007f00d78f7107
RDX: 000055c2224dfea8 RSI: 000055c2224dfe88 RDI: 000055c2224dff30
RBP: 000055c2224dff30 R08: 00007ffe6939aebc R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 000055c2224dfea8
R13: 00007f00d7abce8b R14: 000055c2224dfea8 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10543 jiffies! g52333 f0x0 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:28744 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5260 [inline]
 __schedule+0x1138/0x5ee0 kernel/sched/core.c:6867
 __schedule_loop kernel/sched/core.c:6949 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6964
 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+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </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: 12648 Comm: syz.1.1795 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__list_add_valid_or_report+0x0/0x190 lib/list_debug.c:24
Code: 4c 89 f7 e8 02 ae 73 fd e9 03 eb ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 41 55 41 54 55 48 83 ec 08 48 85 f6 74 7d 48 89 d5 48
RSP: 0018:ffffc90000007cf0 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffff88807ab4c8c0 RCX: ffffffff81804341
RDX: ffff88804fde8988 RSI: ffff88804fde8988 RDI: ffff88807ab4c8c0
RBP: ffff88804fde8988 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: ffff88804fde8b30 R12: ffff88804fde8000
R13: 0000000000000000 R14: 0000000000000021 R15: ffff88804fde8988
FS:  00007fdbf6bf66c0(0000) GS:ffff8881248f1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000000c0 CR3: 000000007ad0e000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __list_add_valid include/linux/list.h:96 [inline]
 __list_add include/linux/list.h:158 [inline]
 list_add_tail include/linux/list.h:191 [inline]
 posixtimer_queue_sigqueue+0x129/0x2f0 kernel/signal.c:1950
 posixtimer_send_sigqueue+0x415/0x1060 kernel/signal.c:2080
 posix_timer_queue_signal+0x106/0x170 kernel/time/posix-timers.c:364
 posix_timer_fn+0x3a/0x80 kernel/time/posix-timers.c:379
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x202/0xc40 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x3c0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:x64_sys_call+0xb2c/0x1740 arch/x86/entry/syscall_64.c:37
Code: 84 c7 07 00 00 76 5a 81 fe d5 00 00 00 0f 84 b4 07 00 00 81 fe d8 00 00 00 0f 85 eb 05 00 00 e9 5a 50 e5 00 81 fe c8 00 00 00 <0f> 84 92 07 00 00 76 4c 81 fe cb 00 00 00 0f 84 7f 07 00 00 0f 86
RSP: 0018:ffffc900047d7f10 EFLAGS: 00000202
RAX: ffffffffffffffff RBX: ffffc900047d7f48 RCX: ffffffff81c722df
RDX: 0000000000000000 RSI: 00000000000000ca RDI: ffffc900047d7f48
RBP: ffffc900047d7f38 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff9088cbd7 R11: 0000000000000000 R12: 00000000000000ca
R13: 00000000000000ca R14: 0000000000000000 R15: 0000000000000000
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdbf898f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fdbf6bf60e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fdbf8be5fa8 RCX: 00007fdbf898f749
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fdbf8be5fa8
RBP: 00007fdbf8be5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdbf8be6038 R14: 00007ffe88977c90 R15: 00007ffe88977d78
 </TASK>