rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P4461/1:b..l
	(detected by 0, t=10502 jiffies, g=10513, q=266 ncpus=2)
task:udevd           state:R  running task     stack:23040 pid:4461  ppid:3638   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:mt_validate+0x3dea/0x4c90 lib/maple_tree.c:-1
Code: 00 00 00 00 fc ff df 4c 8b 74 24 18 8b 4c 24 68 48 8b 5c 24 20 e9 42 e3 ff ff 41 83 fe 03 77 4e e8 6b d0 7c f7 48 8b 44 24 20 <41> 89 c7 e9 b3 fe ff ff 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c f8
RSP: 0018:ffffc90004d5f7c0 EFLAGS: 00000293
RAX: 000000000000000f RBX: 00007fa883369fff RCX: ffff88803101d940
RDX: 0000000000000000 RSI: 00007fa883369fff RDI: 00007fa883363fff
RBP: ffffc90004d5f990 R08: ffff88803101d940 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000000 R12: 00007fa883363fff
R13: ffff888055ae8a08 R14: 0000000000000001 R15: 000000000000000e
 validate_mm_mt+0xcd/0x420 mm/mmap.c:294
 __split_vma+0x30/0x500 mm/mmap.c:2351
 do_mas_align_munmap+0x351/0x1220 mm/mmap.c:2476
 do_mas_munmap+0x240/0x2b0 mm/mmap.c:2646
 __vm_munmap+0x18d/0x290 mm/mmap.c:2932
 __do_sys_munmap mm/mmap.c:2957 [inline]
 __se_sys_munmap mm/mmap.c:2954 [inline]
 __x64_sys_munmap+0x5c/0x70 mm/mmap.c:2954
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa882d1e097
RSP: 002b:00007ffff6296d68 EFLAGS: 00000246 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 00005654717e0c90 RCX: 00007fa882d1e097
RDX: 00005654717cf788 RSI: 0000000000000200 RDI: 00007fa883369000
RBP: 000000000000001d R08: 00005654717e0c60 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000246 R12: 00005654717ce0c0
R13: 00007fa88345339c R14: 0000000000003a00 R15: 0000000000000009
 </TASK>
rcu: rcu_preempt kthread starved for 9221 jiffies! g10513 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:27744 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5244 [inline]
 __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561
 schedule+0xb9/0x180 kernel/sched/core.c:6637
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
 rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
 rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.1.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:default_idle+0xb/0x10 arch/x86/kernel/process.c:742
Code: 48 89 df e8 c7 c9 b0 f7 e9 4c ff ff ff e8 ed 07 f6 ff 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 66 90 0f 00 2d 67 85 66 00 fb f4 <c3> 0f 1f 40 00 41 57 41 56 53 49 be 00 00 00 00 00 fc ff df 65 48
RSP: 0018:ffffffff8c807d88 EFLAGS: 000002c6
RAX: 9e4be734a622f000 RBX: ffffffff8a201e87 RCX: 9e4be734a622f000
RDX: 0000000000000001 RSI: ffffffff8a8c0460 RDI: ffffffff8adef320
RBP: ffffffff8c807ec0 R08: dffffc0000000000 R09: ffffed10171c6af6
R10: ffffed10171c6af6 R11: 1ffff110171c6af5 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8c8bc680 R15: 1ffffffff1c3e9b6
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2a167486c8 CR3: 000000001c68d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 default_idle_call+0x84/0xc0 kernel/sched/idle.c:109
 cpuidle_idle_call kernel/sched/idle.c:191 [inline]
 do_idle+0x1fc/0x570 kernel/sched/idle.c:303
 cpu_startup_entry+0x3f/0x60 kernel/sched/idle.c:401
 rest_init+0x2dc/0x300 init/main.c:733
 arch_call_rest_init+0xa/0xa init/main.c:893
 start_kernel+0x490/0x539 init/main.c:1140
 secondary_startup_64_no_verify+0xcf/0xdb
 </TASK>