rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2659 jiffies s: 10629 root: 0x2/. rcu: blocking rcu_node structures (internal RCU debug): Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 6684 Comm: syz.3.570 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:arch_atomic_cmpxchg arch/x86/include/asm/atomic.h:-1 [inline] RIP: 0010:atomic_cmpxchg include/linux/atomic/atomic-instrumented.h:504 [inline] RIP: 0010:irq_work_single+0x136/0x230 kernel/irq_work.c:218 Code: 42 80 3c 20 00 74 05 e8 d8 de 44 00 48 89 df ff 53 10 41 83 e5 fc 4c 89 f7 be 04 00 00 00 e8 61 e0 44 00 89 e8 f0 45 0f b1 2e <48> c7 c0 b8 09 21 8e 48 c1 e8 03 42 80 3c 20 00 74 0c 48 c7 c7 b8 RSP: 0018:ffffc900001e0c48 EFLAGS: 00000046 RAX: 0000000000000022 RBX: ffff8880b8f3bbb0 RCX: ffffffff818e8c6f RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff8880b8f3bbb8 RBP: 0000000000000022 R08: ffff8880b8f3bbbb R09: 1ffff110171e7777 R10: dffffc0000000000 R11: ffffed10171e7778 R12: dffffc0000000000 R13: 0000000000000020 R14: ffff8880b8f3bbb8 R15: 1ffff110093cf159 FS: 00007fa0bebd56c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd9f7af2990 CR3: 0000000076d54000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: irq_work_run_list kernel/irq_work.c:242 [inline] irq_work_run+0x159/0x2f0 kernel/irq_work.c:251 __sysvec_irq_work+0xba/0x350 arch/x86/kernel/irq_work.c:22 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0x4a/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728 RIP: 0010:variable_ffs arch/x86/include/asm/bitops.h:319 [inline] RIP: 0010:handle_softirqs+0x1b7/0x910 kernel/softirq.c:584 Code: 89 7c 24 2c 0f b7 db 48 c7 c7 00 0e 8b 8a e8 b0 cd e1 08 65 66 c7 05 26 62 b4 7e 00 00 e8 01 5a 39 00 fb 49 c7 c5 c0 a0 80 8c <89> 5c 24 34 b8 ff ff ff ff 0f bc 44 24 34 41 89 c6 41 ff c6 0f 84 RSP: 0018:ffffc900001e0e20 EFLAGS: 00000282 RAX: b3f8512ebe298300 RBX: 0000000000000200 RCX: b3f8512ebe298300 RDX: dffffc0000000000 RSI: ffffffff8a8c1820 RDI: ffffffff8adf6220 RBP: ffffc900001e0f30 R08: ffff8880b8f357cb R09: 1ffff110171e6af9 R10: dffffc0000000000 R11: ffffed10171e6afa R12: dffffc0000000000 R13: ffffffff8c80a0c0 R14: ffff888049e78000 R15: 000000000000000a __do_softirq kernel/softirq.c:630 [inline] invoke_softirq kernel/softirq.c:470 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:22 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:106 [inline] RIP: 0010:rcu_read_unlock_special+0xc8/0x510 kernel/rcu/tree_plugin.h:640 Code: 28 00 00 00 48 3b 84 24 a0 00 00 00 0f 85 9a 03 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 49 89 ff 42 c6 44 2b 08 00 <48> c7 84 24 80 00 00 00 00 00 00 00 9c 8f 84 24 80 00 00 00 4c 8b RSP: 0018:ffffc9000491f920 EFLAGS: 00000246 RAX: f2f2f2f8f1f1f1f1 RBX: 1ffff92000923f2c RCX: 0000000000080000 RDX: ffffc9000f0d2000 RSI: 000000000004c35e RDI: ffff888049e78000 RBP: ffffc9000491fa08 R08: ffff888019a057bf R09: 1ffff11003340af7 R10: dffffc0000000000 R11: ffffed1003340af8 R12: 1ffff110093cf087 R13: dffffc0000000000 R14: 0000000080000000 R15: ffff888049e78000 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426 rcu_read_unlock include/linux/rcupdate.h:823 [inline] page_ext_put+0x91/0xb0 mm/page_ext.c:182 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1487 [inline] free_pcp_prepare mm/page_alloc.c:1537 [inline] free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509 free_slab mm/slub.c:2036 [inline] discard_slab mm/slub.c:2042 [inline] __unfreeze_partials+0x188/0x1e0 mm/slub.c:2591 put_cpu_partial+0x17c/0x250 mm/slub.c:2667 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4b/0x490 mm/slab.h:737 slab_alloc_node mm/slub.c:3359 [inline] slab_alloc mm/slub.c:3367 [inline] __kmem_cache_alloc_lru mm/slub.c:3374 [inline] kmem_cache_alloc+0x18b/0x2f0 mm/slub.c:3383 kmem_cache_zalloc include/linux/slab.h:689 [inline] __alloc_file+0x25/0x230 fs/file_table.c:138 alloc_empty_file+0x90/0x180 fs/file_table.c:187 alloc_file+0x5b/0x5f0 fs/file_table.c:229 alloc_file_pseudo+0x180/0x200 fs/file_table.c:272 sock_alloc_file+0xb3/0x240 net/socket.c:467 sock_map_fd net/socket.c:491 [inline] __sys_socket+0x12d/0x190 net/socket.c:1679 __do_sys_socket net/socket.c:1684 [inline] __se_sys_socket net/socket.c:1682 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1682 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fa0c099e159 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:00007fa0bebd5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007fa0c0c26090 RCX: 00007fa0c099e159 RDX: 0000000000000002 RSI: 000000000000000a RDI: 0000000000000002 RBP: 00007fa0c0a35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa0c0c26128 R14: 00007fa0c0c26090 R15: 00007ffc1429d448