rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-....: (1 GPs behind) idle=de2c/1/0x4000000000000000 softirq=51210/51222 fqs=2099 rcu: hardirqs softirqs csw/system rcu: number: 7546231 0 0 rcu: cputime: 24953 0 0 ==> 52500(ms) rcu: (detected by 0, t=10505 jiffies, g=79001, q=788 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 12303 Comm: syz.3.2082 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:asm_sysvec_irq_work+0x0/0x20 arch/x86/include/asm/idtentry.h:723 Code: 96 37 e2 ff e9 a1 03 00 00 90 f3 0f 1e fa 0f 01 ca fc 6a ff e8 a1 02 00 00 48 89 c4 48 89 e7 e8 d6 19 e2 ff e9 81 03 00 00 90 0f 1e fa 0f 01 ca fc 6a ff e8 81 02 00 00 48 89 c4 48 89 e7 e8 RSP: 0018:ffffc900044df288 EFLAGS: 00000086 RAX: 2bb43f70d2e49d00 RBX: 0000000000000000 RCX: 2bb43f70d2e49d00 RDX: dffffc0000000000 RSI: ffffffff8acabd00 RDI: ffffffff8b1c74a0 RBP: ffffc900044df310 R08: ffffffff911a4537 R09: 1ffffffff22348a6 R10: dffffc0000000000 R11: fffffbfff22348a7 R12: ffff888018f2bc00 R13: dffffc0000000000 R14: ffff888021283c00 R15: ffff8880b8f3cac8 FS: 00007f4064ddb6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff584aeec0 CR3: 0000000052f35000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: RIP: 0010:finish_task_switch+0x26a/0x8f0 kernel/sched/core.c:5255 Code: 0f 84 33 01 00 00 48 85 db 0f 85 52 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 60 bf 2e 09 e8 0b 21 30 00 fb 4c 8b 65 c0 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 RSP: 0018:ffffc900044df2b8 EFLAGS: 00000286 context_switch kernel/sched/core.c:5384 [inline] __schedule+0x155b/0x45a0 kernel/sched/core.c:6700 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7010 irqentry_exit+0x67/0x70 kernel/entry/common.c:438 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:refill_obj_stock+0x3fc/0x6a0 mm/memcontrol.c:3385 Code: 24 80 00 00 00 f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 25 08 f8 0f 85 ad 00 00 00 f7 c3 00 02 00 00 74 01 fb 48 8b 7c 24 20 <48> 85 ff 74 05 e8 1a 95 00 00 45 85 f6 74 4f 48 8b 7c 24 08 e8 7b RSP: 0000:ffffc900044df6a0 EFLAGS: 00000206 RAX: 2bb43f70d2e49d00 RBX: 0000000000000a02 RCX: 2bb43f70d2e49d00 RDX: dffffc0000000000 RSI: ffffffff8acabd00 RDI: 0000000000000000 RBP: ffffc900044df7a0 R08: ffffffff911a4537 R09: 1ffffffff22348a6 R10: dffffc0000000000 R11: fffffbfff22348a7 R12: dffffc0000000000 R13: 1ffff9200089bedc R14: 0000000000000000 R15: ffff8880b8f37d90 memcg_slab_free_hook+0x125/0x1f0 mm/slab.h:576 slab_free mm/slub.c:3825 [inline] kmem_cache_free+0xe1/0x270 mm/slub.c:3852 remove_vma mm/mmap.c:146 [inline] exit_mmap+0x61d/0xb90 mm/mmap.c:3326 __mmput+0x118/0x3c0 kernel/fork.c:1355 copy_process+0x2960/0x3d80 kernel/fork.c:2765 kernel_clone+0x24b/0x8a0 kernel/fork.c:2914 __do_sys_clone kernel/fork.c:3057 [inline] __se_sys_clone kernel/fork.c:3041 [inline] __x64_sys_clone+0x1b7/0x230 kernel/fork.c:3041 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f4063f9acb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4064ddafd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f4064215fa0 RCX: 00007f4063f9acb9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000004801000 RBP: 00007f4064008bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007f4064216038 R14: 00007f4064215fa0 R15: 00007fff584af148