rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5824/1:b..l P5503/1:b..l P5208/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=37545, q=663 ncpus=2)
task:udevd           state:R  running task     stack:22952 pid:5208  tgid:5208  ppid:1      task_flags:0x40054c flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0x16aa/0x4c90 kernel/sched/core.c:6786
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7109
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:trace_lock_acquire include/trace/events/lock.h:24 [inline]
RIP: 0010:lock_acquire+0x5f/0x360 kernel/locking/lockdep.c:5834
Code: 89 44 24 58 0f 1f 44 00 00 65 8b 05 af 56 fe 10 83 f8 08 0f 83 b8 01 00 00 89 c0 48 0f a3 05 58 7a 02 0e 73 16 e8 f1 f0 08 00 <84> c0 75 0d f6 05 93 64 ec 0d 01 0f 84 d7 01 00 00 83 3d 79 ab 02
RSP: 0018:ffffc9000387f258 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 12023ba9a5109300
RDX: 0000000000000000 RSI: ffffffff8be1ba20 RDI: ffffffff8be1b9e0
RBP: ffffffff8172aae5 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc9000387f418 R11: ffffffff81acfd40 R12: 0000000000000002
R13: ffffffff8e13f0e0 R14: 0000000000000000 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:841 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
 unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479
 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:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2381 [inline]
 slab_free mm/slub.c:4643 [inline]
 kfree+0x18e/0x440 mm/slub.c:4842
 vma_numab_state_free include/linux/mm.h:665 [inline]
 vm_area_free+0x81/0x210 mm/vma_init.c:147
 exit_mmap+0x53f/0xb50 mm/mmap.c:1309
 __mmput+0x118/0x410 kernel/fork.c:1121
 exit_mm+0x1da/0x2c0 kernel/exit.c:581
 do_exit+0x648/0x22e0 kernel/exit.c:952
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1105
 get_signal+0x125e/0x1310 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111
 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f95728a7407
RSP: 002b:00007fff5ce2d840 EFLAGS: 00000202 ORIG_RAX: 00000000000000e8
RAX: fffffffffffffffc RBX: 00007f957300c880 RCX: 00007f95728a7407
RDX: 0000000000000008 RSI: 00007fff5ce2d9a0 RDI: 000000000000000b
RBP: 00000000000000b9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000bb8 R11: 0000000000000202 R12: 0000000000000000
R13: 000055975691c100 R14: 0000559787e2f5d0 R15: 0000000000000000
 </TASK>
task:dhcpcd          state:R  running task     stack:21384 pid:5503  tgid:5503  ppid:1      task_flags:0x40054c flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0x16aa/0x4c90 kernel/sched/core.c:6786
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7109
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:tif_test_bit include/linux/thread_info.h:193 [inline]
RIP: 0010:tif_need_resched include/linux/thread_info.h:208 [inline]
RIP: 0010:need_resched include/linux/sched.h:2168 [inline]
RIP: 0010:preempt_schedule_common+0x91/0xd0 kernel/sched/core.c:6974
Code: 42 80 3c 38 00 74 08 4c 89 f7 e8 4a 5c b8 f6 49 89 1e bf 01 00 00 00 e8 bd ad ff ff 65 8b 05 76 de 34 07 65 ff 0d 6f de 34 07 <65> 48 8b 1c 25 08 90 9c 92 48 89 d8 48 c1 e8 03 42 80 3c 38 00 0f
RSP: 0018:ffffc9000390f620 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffffff8b67b10e RCX: 72742a291ae3ac00
RDX: 0000000000000000 RSI: ffffffff8be1ba20 RDI: ffffffff8be1b9e0
RBP: ffffc9000390f6b8 R08: ffffffff8fa0b3f7 R09: 1ffffffff1f4167e
R10: dffffc0000000000 R11: fffffbfff1f4167f R12: dffffc0000000000
R13: ffff888030e18080 R14: ffff88802ef732e0 R15: dffffc0000000000
 preempt_schedule+0xae/0xc0 kernel/sched/core.c:6990
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0xfd/0x110 kernel/locking/spinlock.c:194
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 __wake_up_common_lock+0x190/0x1f0 kernel/sched/wait.c:108
 sock_def_wakeup+0x15b/0x260 net/core/sock.c:3558
 unix_release_sock+0x758/0xd30 net/unix/af_unix.c:714
 unix_release+0x92/0xd0 net/unix/af_unix.c:1153
 __sock_release net/socket.c:647 [inline]
 sock_close+0xc3/0x240 net/socket.c:1391
 __fput+0x449/0xa70 fs/file_table.c:465
 task_work_run+0x1d1/0x260 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x6b5/0x22e0 kernel/exit.c:964
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1105
 get_signal+0x125e/0x1310 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111
 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6d1bd0c5d7
RSP: 002b:00007ffc9ac3e1a8 EFLAGS: 00000202 ORIG_RAX: 0000000000000030
RAX: 0000000000000000 RBX: 0000564dcfe80cb0 RCX: 00007f6d1bd0c5d7
RDX: 0000000000000571 RSI: 0000000000000001 RDI: 000000000000001b
RBP: 0000000000000000 R08: 00000000000003a0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc9ac4e3f0
R13: 0000564dcfe771f0 R14: 00007ffc9ac3e201 R15: 0000000000000000
 </TASK>
task:syz-executor    state:R  running task     stack:21512 pid:5824  tgid:5824  ppid:5823   task_flags:0x40050c flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0x16aa/0x4c90 kernel/sched/core.c:6786
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7109
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709
RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:206 [inline]
RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:238 [inline]
RIP: 0010:tif_test_bit include/linux/thread_info.h:192 [inline]
RIP: 0010:tif_need_resched include/linux/thread_info.h:208 [inline]
RIP: 0010:need_resched include/linux/sched.h:2168 [inline]
RIP: 0010:preempt_schedule_common+0x11/0xd0 kernel/sched/core.c:6974
Code: 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 53 49 bf 00 00 00 00 00 fc ff df eb 0d <48> f7 03 08 00 00 00 0f 84 9b 00 00 00 65 ff 05 db de 34 07 65 8b
RSP: 0018:ffffc90003f8f280 EFLAGS: 00000246
RAX: 1ffff1100f884b40 RBX: ffff88807c425a00 RCX: 9ead5bca38b99a00
RDX: 0000000000000000 RSI: ffffffff8be1ba20 RDI: ffffffff8be1b9e0
RBP: ffffc90003f8f328 R08: ffffffff8fa0b3f7 R09: 1ffffffff1f4167e
R10: dffffc0000000000 R11: fffffbfff1f4167f R12: 000055555f6c4000
R13: dffffc0000000000 R14: ffff88807c426ee0 R15: dffffc0000000000
 preempt_schedule+0xae/0xc0 kernel/sched/core.c:6990
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 zap_pte_range mm/memory.c:1765 [inline]
 zap_pmd_range mm/memory.c:1827 [inline]
 zap_pud_range mm/memory.c:1856 [inline]
 zap_p4d_range mm/memory.c:1877 [inline]
 unmap_page_range+0x3842/0x41c0 mm/memory.c:1898
 unmap_single_vma mm/memory.c:1941 [inline]
 unmap_vmas+0x399/0x580 mm/memory.c:1985
 exit_mmap+0x248/0xb50 mm/mmap.c:1284
 __mmput+0x118/0x410 kernel/fork.c:1121
 exit_mm+0x1da/0x2c0 kernel/exit.c:581
 do_exit+0x648/0x22e0 kernel/exit.c:952
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1105
 get_signal+0x125e/0x1310 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111
 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fea61b8e9ac
RSP: 002b:00007ffc5d89ba50 EFLAGS: 00000202 ORIG_RAX: 000000000000010e
RAX: fffffffffffffdfe RBX: 00007ffc5d89bb80 RCX: 00007fea61b8e9ac
RDX: 0000000000000000 RSI: 00007ffc5d89bb80 RDI: 0000000000000026
RBP: 00007ffc5d89bdc0 R08: 00007ffc5d89ba80 R09: 00007ffc5d89ba90
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc5d89be20
R13: 0000000000000000 R14: 00007ffc5d89bfd0 R15: 00007ffc5d89bc10
 </TASK>
rcu: rcu_preempt kthread starved for 10632 jiffies! g37545 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:26888 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0x16aa/0x4c90 kernel/sched/core.c:6786
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7109
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709
RIP: 0010:preempt_count_sub+0x65/0x170 kernel/sched/core.c:5911
Code: ff ff ff 7f 39 cf 7f 2a 81 ff ff 00 00 00 0f 93 c1 84 c0 0f 95 c0 08 c8 74 5e 65 8b 05 64 ad 0b 11 f7 df 65 01 3d 5b ad 0b 11 <5b> 5d e9 44 80 d8 09 cc 90 e8 6d 14 25 03 85 c0 74 39 48 c7 c0 34
RSP: 0018:ffffc90000157a10 EFLAGS: 00000257
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8be1ba20 RDI: 00000000ffffffff
RBP: 1ffff11003a5cb43 R08: ffffffff8fa0b3f7 R09: 1ffffffff1f4167e
R10: dffffc0000000000 R11: fffffbfff1f4167f R12: ffff88801d2e5a2c
R13: dffffc0000000000 R14: 1ffff11003a5cb40 R15: ffff88801d2e6c88
 __schedule_loop kernel/sched/core.c:6865 [inline]
 schedule+0x16f/0x360 kernel/sched/core.c:6879
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 10900 Comm: syz.3.1218 Not tainted 6.16.0-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:finish_task_switch+0x26b/0x950 kernel/sched/core.c:5265
Code: 0f 84 3c 01 00 00 48 85 db 0f 85 63 01 00 00 e9 27 05 00 00 4c 8b 75 d0 4c 89 e7 e8 ff 1a d7 09 e8 da b7 35 00 fb 4c 8b 65 c0 <49> 8d bc 24 18 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc9000479f5f8 EFLAGS: 00000282
RAX: 1f5bcfc93c22d000 RBX: 0000000000000000 RCX: 1f5bcfc93c22d000
RDX: 0000000000000000 RSI: ffffffff8d982fba RDI: ffffffff8be1ba40
RBP: ffffc9000479f650 R08: ffffffff8fa0b3f7 R09: 1ffffffff1f4167e
R10: dffffc0000000000 R11: fffffbfff1f4167f R12: ffff888020bebc00
R13: dffffc0000000000 R14: ffff88807cf3da00 R15: ffff8880b863a9d8
FS:  00007f0d6ea266c0(0000) GS:ffff888125c57000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564dcfe760a0 CR3: 000000002869e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x16b2/0x4c90 kernel/sched/core.c:6786
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7109
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:preempt_count_add+0x0/0x1a0 kernel/sched/core.c:5862
Code: c1 7c 97 48 8b 3c 24 e8 2e 2c 8f 00 eb 8c e9 f1 fe 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 <f3> 0f 1e fa 41 57 41 56 53 49 bf 00 00 00 00 00 fc ff df 48 c7 c0
RSP: 0018:ffffc9000479f9e0 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffff888020bebc00 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8be1ba20 RDI: 0000000000000001
RBP: 1ffff1100417d783 R08: ffffffff8fa0b3f7 R09: 1ffffffff1f4167e
R10: dffffc0000000000 R11: fffffbfff1f4167f R12: ffff888020bebc2c
R13: dffffc0000000000 R14: 1ffff1100417d780 R15: ffff888020bece88
 __schedule_loop kernel/sched/core.c:6863 [inline]
 schedule+0x15e/0x360 kernel/sched/core.c:6879
 futex_do_wait kernel/futex/waitwake.c:358 [inline]
 __futex_wait+0x1c3/0x3e0 kernel/futex/waitwake.c:687
 futex_wait+0x104/0x360 kernel/futex/waitwake.c:715
 do_futex+0x333/0x420 kernel/futex/syscalls.c:102
 __do_sys_futex kernel/futex/syscalls.c:179 [inline]
 __se_sys_futex+0x36f/0x400 kernel/futex/syscalls.c:160
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0d6db8ebe9
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:00007f0d6ea260e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f0d6ddb6098 RCX: 00007f0d6db8ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f0d6ddb6098
RBP: 00007f0d6ddb6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0d6ddb6128 R14: 00007fff801d8ee0 R15: 00007fff801d8fc8
 </TASK>