rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6187/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=13749, q=707 ncpus=2)
task:udevd           state:R  running task     stack:25752 pid:6187  tgid:6187  ppid:5185   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x1139/0x6150 kernel/sched/core.c:6863
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7190
 irqentry_exit+0x1d8/0x8c0 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:debug_lockdep_rcu_enabled+0x26/0x40 kernel/rcu/update.c:320
Code: 90 90 90 90 f3 0f 1e fa 8b 05 56 83 10 05 85 c0 74 20 8b 05 00 b3 10 05 85 c0 74 16 65 48 8b 05 98 78 3a 08 8b 80 2c 0b 00 00 <85> c0 0f 94 c0 0f b6 c0 e9 0d 2c 03 00 66 2e 0f 1f 84 00 00 00 00
RSP: 0018:ffffc9000c537798 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 00000000e6304215
RDX: 0000000000000000 RSI: ffffffff8daa89dc RDI: ffffffff8bf2b400
RBP: ffffc9000c537860 R08: 000000002d5ba6a8 R09: 0000000082d5ba6a
R10: 0000000000000002 R11: ffff88802c72aff0 R12: ffffffff81a96130
R13: ffffc9000c537818 R14: 0000000000000000 R15: ffff88802c72a4c0
 rcu_read_lock include/linux/rcupdate.h:868 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
 unwind_next_frame+0xd6/0x20b0 arch/x86/kernel/unwind_orc.c:495
 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
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_lru_noprof+0x262/0x770 mm/slub.c:5282
 shmem_alloc_inode+0x25/0x50 mm/shmem.c:5152
 alloc_inode+0x64/0x240 fs/inode.c:346
 new_inode+0x22/0x1c0 fs/inode.c:1175
 __shmem_get_inode mm/shmem.c:3068 [inline]
 shmem_get_inode+0x19a/0xfb0 mm/shmem.c:3142
 shmem_symlink+0xf4/0x960 mm/shmem.c:4103
 vfs_symlink fs/namei.c:5523 [inline]
 vfs_symlink+0x4b5/0x800 fs/namei.c:5502
 do_symlinkat+0x353/0x4b0 fs/namei.c:5550
 __do_sys_symlink fs/namei.c:5576 [inline]
 __se_sys_symlink fs/namei.c:5574 [inline]
 __x64_sys_symlink+0x75/0x90 fs/namei.c:5574
 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: 0033:0x7fcbea115527
RSP: 002b:00007ffd8189e6f8 EFLAGS: 00000206 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 000055bc0adb6cf0 RCX: 00007fcbea115527
RDX: fffffffffffffe68 RSI: 00007ffd8189e700 RDI: 000055bc0adaa6b0
RBP: 0000000000000104 R08: 0000000000000064 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffd8189e700
R13: 000055bc0ada38d0 R14: 0000000000000008 R15: 000055bc0adb6cf0
 </TASK>
rcu: rcu_preempt kthread starved for 10538 jiffies! g13749 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:28024 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x1139/0x6150 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6960
 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:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: a6 5f 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 13 19 12 00 fb f4 <e9> cc 35 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffffff8e007df8 EFLAGS: 000002c6
RAX: 00000000005eae7d RBX: 0000000000000000 RCX: ffffffff8b7846d9
RDX: 0000000000000000 RSI: ffffffff8dacea71 RDI: ffffffff8bf2b400
RBP: fffffbfff1c12f68 R08: 0000000000000001 R09: ffffed101708673d
R10: ffff8880b84339eb R11: ffffffff8e098670 R12: 0000000000000000
R13: ffffffff8e097b40 R14: ffffffff9088b9d0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881248f5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2700c5 CR3: 000000005001b000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:767
 default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:191 [inline]
 do_idle+0x38d/0x510 kernel/sched/idle.c:332
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
 rest_init+0x16b/0x2b0 init/main.c:757
 start_kernel+0x3ef/0x4d0 init/main.c:1206
 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:310
 x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:291
 common_startup_64+0x13e/0x148
 </TASK>