rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { P9873 1-.... } 2671 jiffies s: 17561 root: 0x2/T
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 9876 Comm: syz.4.1919 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:rcu_preempt_deferred_qs_handler+0x9b/0x170 kernel/rcu/tree_plugin.h:620
Code: 24 40 00 00 00 00 9c 8f 44 24 40 4c 8b 64 24 40 fa 41 f7 c4 00 02 00 00 75 1d 48 83 c3 20 48 89 d8 48 c1 e8 03 42 0f b6 04 30 <84> c0 0f 85 99 00 00 00 c6 03 00 eb 25 e8 23 55 1a 00 48 83 c3 20
RSP: 0018:ffffc900001e0720 EFLAGS: 00000806
RAX: 0000000000000000 RBX: ffff8880b8f3b9d0 RCX: ffff88802e831dc0
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff8880b8f3b9b0
RBP: ffffc900001e07d8 R08: dffffc0000000000 R09: ffffed10171e7738
R10: ffffed10171e7738 R11: 1ffff110171e7737 R12: 0000000000000806
R13: 0000000000000023 R14: dffffc0000000000 R15: 1ffff9200003c0e4
FS:  00007fc1dcb426c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3248c6 CR3: 0000000038d17000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 irq_work_single+0xd1/0x230 kernel/irq_work.c:211
 irq_work_run_list kernel/irq_work.c:242 [inline]
 irq_work_run+0x152/0x2e0 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:rcu_read_unlock_special+0x84/0x500 kernel/rcu/tree_plugin.h:685
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 2d 97 96 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900001e09c0 EFLAGS: 00000206
RAX: 541f79f7af0d7400 RBX: 1ffff9200003c140 RCX: 541f79f7af0d7400
RDX: dffffc0000000000 RSI: ffffffff8a8c0500 RDI: ffffffff8adefca0
RBP: ffffc900001e0ac0 R08: dffffc0000000000 R09: fffffbfff215c45d
R10: fffffbfff215c45d R11: 1ffffffff215c45c R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3b900 R15: 0000000000000002
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 process_backlog+0x3ff/0x6e0 net/core/dev.c:6024
 __napi_poll+0xc0/0x460 net/core/dev.c:6590
 napi_poll net/core/dev.c:6657 [inline]
 net_rx_action+0x5b1/0xad0 net/core/dev.c:6771
 handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x12f/0x220 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:preempt_count_sub+0x0/0x160 kernel/sched/core.c:5732
Code: 48 c7 c1 a8 aa 1f 8e 80 e1 07 80 c1 03 38 c1 0f 8c 6e ff ff ff 48 c7 c7 a8 aa 1f 8e e8 e9 39 79 00 89 df e9 5b ff ff ff 66 90 <55> 53 48 bb 00 00 00 00 00 fc ff df 48 c7 c0 40 91 be 96 48 c1 e8
RSP: 0018:ffffc9000390f2e8 EFLAGS: 00000216
RAX: ffffc90003910000 RBX: ffffc9000390f3c8 RCX: ffffc9000390f778
RDX: ffffc9000390f401 RSI: dffffc0000000000 RDI: 0000000000000001
RBP: ffffffff8ea9a272 R08: ffffc9000390f760 R09: ffffc9000390f418
R10: fffff52000721e85 R11: 1ffff92000721e83 R12: ffffc90003908000
R13: dffffc0000000000 R14: ffffc9000390f3d8 R15: ffffc9000390f770
 unwind_next_frame+0x1880/0x20b0 arch/x86/kernel/unwind_orc.c:629
 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 __kasan_slab_alloc+0x6b/0x80 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x4b/0x480 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+0x123/0x2f0 mm/slub.c:3383
 vm_area_dup+0x23/0x1a0 kernel/fork.c:467
 dup_mmap kernel/fork.c:646 [inline]
 dup_mm kernel/fork.c:1541 [inline]
 copy_mm+0xa7e/0x15c0 kernel/fork.c:1590
 copy_process+0x1953/0x4020 kernel/fork.c:2351
 kernel_clone+0x225/0x8b0 kernel/fork.c:2757
 __do_sys_clone kernel/fork.c:2898 [inline]
 __se_sys_clone kernel/fork.c:2882 [inline]
 __x64_sys_clone+0x17c/0x1d0 kernel/fork.c:2882
 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: 0033:0x7fc1dbd8eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc1dcb41fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fc1dbfe5fa0 RCX: 00007fc1dbd8eec9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020083400
RBP: 00007fc1dbe11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fc1dbfe6038 R14: 00007fc1dbfe5fa0 R15: 00007ffcbd610098
 </TASK>