rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P18583/1:b..l P18982/1:b..l P26191/1:b..l P22710/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=130033, q=421 ncpus=2)
task:syz-executor    state:R  running task     stack:21672 pid:22710 tgid:22710 ppid:22692  task_flags:0x400140 flags:0x00080001
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7256
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:-1 [inline]
RIP: 0010:unwind_next_frame+0xc3f/0x2390 arch/x86/kernel/unwind_orc.c:585
Code: 85 f9 0c 00 00 48 8d 43 08 4c 39 f8 0f 97 c1 4c 39 e0 0f 96 c0 20 c8 3c 01 0f 85 df 0c 00 00 48 89 df e8 84 23 00 00 48 89 c3 <48> bd 00 00 00 00 00 fc ff df 48 8b 44 24 30 80 3c 28 00 4c 8b 7c
RSP: 0018:ffffc90004bdf218 EFLAGS: 00000202
RAX: ffffffff81000130 RBX: ffffffff81000130 RCX: 1ffff9200097be01
RDX: ffffffff90d2c43c RSI: 0000000000000002 RDI: ffffc90004bdff40
RBP: 1ffff9200097be5e R08: 0000000000000001 R09: ffffffff8173cd25
R10: dffffc0000000000 R11: ffffffff81ac6cd0 R12: ffffc90004be0000
R13: 1ffff9200097be5f R14: ffffc90004bdf2e8 R15: ffffc90004bd8000
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 save_stack+0xf5/0x1f0 mm/page_owner.c:156
 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:308
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 free_unref_folios+0xdb3/0x14f0 mm/page_alloc.c:2963
 folios_put_refs+0x584/0x670 mm/swap.c:1002
 folio_batch_release include/linux/pagevec.h:101 [inline]
 shmem_undo_range+0x49e/0x14b0 mm/shmem.c:1120
 shmem_truncate_range mm/shmem.c:1232 [inline]
 shmem_evict_inode+0x272/0xa70 mm/shmem.c:1360
 evict+0x504/0x9c0 fs/inode.c:810
 do_unlinkat+0x39f/0x560 fs/namei.c:4744
 __do_sys_unlink fs/namei.c:4783 [inline]
 __se_sys_unlink fs/namei.c:4781 [inline]
 __x64_sys_unlink+0x47/0x50 fs/namei.c:4781
 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: 0033:0x7fbbc8f8e477
RSP: 002b:00007ffc1137d298 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbbc8f8e477
RDX: 00007ffc1137d2c0 RSI: 00007ffc1137d350 RDI: 00007ffc1137d350
RBP: 00007ffc1137d350 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffc1137e3e0
R13: 00007fbbc9011d7d R14: 0000000000178c52 R15: 00007ffc1137e420
 </TASK>
task:dhcpcd-run-hook state:R  running task     stack:24584 pid:26191 tgid:26191 ppid:5486   task_flags:0x400000 flags:0x00080001
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7256
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5872
Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 fb ac f3 10 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000dd87270 EFLAGS: 00000206
RAX: b698ce9adc726f00 RBX: 0000000000000000 RCX: b698ce9adc726f00
RDX: 0000000000000000 RSI: ffffffff8d9d1510 RDI: ffffffff8bc076e0
RBP: ffffffff81cf5336 R08: 0000000000000000 R09: ffffffff81cf5336
R10: dffffc0000000000 R11: ffffffff81ac6cd0 R12: 0000000000000002
R13: ffffffff8e13d2e0 R14: 0000000000000000 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:867 [inline]
 is_bpf_text_address+0x47/0x2b0 kernel/bpf/core.c:744
 kernel_text_address+0xa5/0xe0 kernel/extable.c:125
 __kernel_text_address+0xd/0x40 kernel/extable.c:79
 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369
 arch_stack_walk+0xfc/0x150 arch/x86/kernel/stacktrace.c:26
 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:4955 [inline]
 slab_alloc_node mm/slub.c:5265 [inline]
 kmem_cache_alloc_noprof+0x367/0x6e0 mm/slub.c:5272
 anon_vma_alloc mm/rmap.c:93 [inline]
 anon_vma_fork+0xde/0x500 mm/rmap.c:359
 dup_mmap+0x9e2/0x1b10 mm/mmap.c:1797
 dup_mm kernel/fork.c:1489 [inline]
 copy_mm+0x13c/0x4b0 kernel/fork.c:1541
 copy_process+0x1706/0x3c00 kernel/fork.c:2181
 kernel_clone+0x21e/0x840 kernel/fork.c:2609
 __do_sys_clone kernel/fork.c:2750 [inline]
 __se_sys_clone kernel/fork.c:2734 [inline]
 __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2734
 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: 0033:0x7f81122ea636
RSP: 002b:00007ffc7a78cae0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffc7a78cae8 RCX: 00007f81122ea636
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000562a7be9cc30 R08: 0000000000000000 R09: 00000000000000d0
R10: 00007f8112150f50 R11: 0000000000000246 R12: 0000562a7beab0b0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
task:udevd           state:R  running task     stack:23336 pid:18982 tgid:18982 ppid:5191   task_flags:0x400140 flags:0x00080001
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7256
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:rcu_read_lock_held_common kernel/rcu/update.c:105 [inline]
RIP: 0010:rcu_read_lock_held+0x5/0x50 kernel/rcu/update.c:349
Code: e9 5b e1 6a ff cc 66 66 66 66 66 66 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 f3 0f 1e fa 53 <e8> f6 a8 a6 09 85 c0 74 26 31 db e8 eb 2d 01 00 84 c0 74 20 e8 62
RSP: 0018:ffffc900048d77f0 EFLAGS: 00000246
RAX: ffffffff823d8092 RBX: 0000000000000000 RCX: ffff8880115a8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8880253f2a88 R08: ffffc900007aef4f R09: 1ffff920000f5de9
R10: dffffc0000000000 R11: fffff520000f5dea R12: 00000004b5de90be
R13: ffffc900007aef48 R14: 1ffff920000f5de9 R15: dffffc0000000000
 hlist_bl_first_rcu include/linux/rculist_bl.h:24 [inline]
 __d_lookup_rcu+0x11d/0x490 fs/dcache.c:2286
 lookup_fast+0xdb/0x5b0 fs/namei.c:1750
 walk_component fs/namei.c:2147 [inline]
 link_path_walk+0x642/0xea0 fs/namei.c:2519
 path_lookupat+0x97/0x430 fs/namei.c:2675
 filename_lookup+0x212/0x570 fs/namei.c:2705
 vfs_statx+0xf8/0x550 fs/stat.c:353
 vfs_fstatat+0x118/0x170 fs/stat.c:375
 __do_sys_newfstatat fs/stat.c:542 [inline]
 __se_sys_newfstatat fs/stat.c:536 [inline]
 __x64_sys_newfstatat+0x116/0x190 fs/stat.c:536
 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: 0033:0x7fd82b311b0a
RSP: 002b:00007ffe1d68d608 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 000000000000000e RCX: 00007fd82b311b0a
RDX: 00007ffe1d68d610 RSI: 00007ffe1d68d6e0 RDI: 00000000ffffff9c
RBP: 00007ffe1d68e720 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe1d68eb40
R13: 0000000000000000 R14: 0000557707c30100 R15: 0000557707c30140
 </TASK>
task:udevd           state:R  running task     stack:23368 pid:18583 tgid:18583 ppid:5191   task_flags:0x400140 flags:0x00080001
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7256
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0xa70/0x2390 arch/x86/kernel/unwind_orc.c:581
Code: c0 0f 85 82 17 00 00 48 89 d8 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 99 17 00 00 48 0f bf 02 49 01 c4 48 8d 5e 01 48 8b 44 24 40 <0f> b6 04 28 84 c0 0f 85 78 13 00 00 49 89 df 49 c1 ef 03 41 0f b6
RSP: 0018:ffffc9000b0d74f8 EFLAGS: 00000282
RAX: 1ffffffff2071301 RBX: ffffffff9038980b RCX: ffffffff8fb9a380
RDX: ffffffff90389806 RSI: ffffffff9038980a RDI: ffffffff8bc07680
RBP: dffffc0000000000 R08: 0000000000000011 R09: ffffffff8173cd25
R10: dffffc0000000000 R11: ffffffff81ac6cd0 R12: ffffc9000b0d7d80
R13: ffffc9000b0d7618 R14: ffffc9000b0d75c8 R15: ffffc9000b0d7600
 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
 poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __kmalloc_cache_noprof+0x3d5/0x6f0 mm/slub.c:5748
 kmalloc_noprof include/linux/slab.h:957 [inline]
 slab_free_hook mm/slub.c:2475 [inline]
 slab_free mm/slub.c:6611 [inline]
 kmem_cache_free+0x16f/0x690 mm/slub.c:6721
 remove_vma mm/vma.c:468 [inline]
 vms_complete_munmap_vmas+0x626/0x8a0 mm/vma.c:1293
 do_vmi_align_munmap+0x364/0x440 mm/vma.c:1536
 do_vmi_munmap+0x253/0x2e0 mm/vma.c:1584
 __vm_munmap+0x207/0x380 mm/vma.c:3156
 __do_sys_munmap mm/mmap.c:1080 [inline]
 __se_sys_munmap mm/mmap.c:1077 [inline]
 __x64_sys_munmap+0x60/0x70 mm/mmap.c:1077
 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: 0033:0x7fd82b31e097
RSP: 002b:00007ffe1d689b88 EFLAGS: 00000246 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 00005577300dfbd0 RCX: 00007fd82b31e097
RDX: 00005577300dfbb8 RSI: 0000000000000200 RDI: 00007fd82a7f6000
RBP: 00005577300d0be0 R08: 0000000000000030 R09: 0000000000040000
R10: 00005577300d0bd0 R11: 0000000000000246 R12: 00007fd82ba427c0
R13: 00007fd82ba4439c R14: 0000000000000022 R15: 0000000000000001
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10687 jiffies! g130033 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=110981
rcu: rcu_preempt kthread starved for 10688 jiffies! g130033 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27296 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7026
 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>
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: 1294 Comm: aoe_tx0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:check_preemption_disabled+0x5/0x120 lib/smp_processor_id.c:13
Code: 48 c7 c6 c0 76 c0 8b eb 1c 66 66 66 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 55 41 57 41 56 <53> 48 83 ec 10 65 48 8b 05 de 24 45 07 48 89 44 24 08 65 8b 05 e6
RSP: 0018:ffffc9000408f600 EFLAGS: 00000046
RAX: 0000000000000002 RBX: ffff888027191e40 RCX: ffffffff9342c758
RDX: 0000000000000002 RSI: ffffffff8d9d1510 RDI: ffffffff8bc076e0
RBP: ffffc9000408f6e8 R08: ffffffff8f9e1177 R09: 1ffffffff1f3c22e
R10: dffffc0000000000 R11: fffffbfff1f3c22f R12: ffff8880271929c0
R13: dffffc0000000000 R14: ffff888027192970 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff888125e0c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdc1f484000 CR3: 0000000081d1b000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline]
 lockdep_hardirqs_on_prepare+0x1b4/0x2a0 kernel/locking/lockdep.c:4411
 trace_hardirqs_on+0x28/0x40 kernel/trace/trace_preemptirq.c:78
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
 _raw_spin_unlock_irqrestore+0x85/0x110 kernel/locking/spinlock.c:194
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 uart_port_unlock_irqrestore include/linux/serial_core.h:788 [inline]
 uart_port_unlock_deref+0x111/0x2f0 drivers/tty/serial/serial_core.c:91
 uart_write_room+0xe4/0x170 drivers/tty/serial/serial_core.c:647
 handle_tx+0x163/0x610 drivers/net/caif/caif_serial.c:212
 __netdev_start_xmit include/linux/netdevice.h:5248 [inline]
 netdev_start_xmit include/linux/netdevice.h:5257 [inline]
 xmit_one net/core/dev.c:3845 [inline]
 dev_hard_start_xmit+0x2d7/0x830 net/core/dev.c:3861
 __dev_queue_xmit+0x1b8d/0x3b50 net/core/dev.c:4763
 dev_queue_xmit include/linux/netdevice.h:3365 [inline]
 tx+0x6b/0x190 drivers/block/aoe/aoenet.c:62
 kthread+0x1d0/0x3e0 drivers/block/aoe/aoecmd.c:1241
 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>