rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-....: (2 ticks this GP) idle=cc7/1/0x4000000000000002 softirq=9333/9333 fqs=2323 
	(detected by 1, t=10502 jiffies, g=10221, q=1309)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5172 Comm: syz.3.261 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__this_cpu_preempt_check+0x0/0x10 lib/smp_processor_id.c:65
Code: 48 89 da e8 22 70 f5 ff 48 8b 74 24 30 48 c7 c7 c0 a2 59 8a e8 11 70 f5 ff e8 6c 20 f8 ff eb a8 e8 d5 ee ff ff 0f 1f 44 00 00 <48> 89 fe 48 c7 c7 40 a2 59 8a e9 e1 fe ff ff 00 eb 1e 0f 1f 00 48
RSP: 0018:ffffc90000006f28 EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffff888079ed9dc0 RCX: 0000000000000001
RDX: 0000000000000100 RSI: ffffffff8c11c460 RDI: ffffffff8a0b28c0
RBP: 0000000000000001 R08: dffffc0000000000 R09: ffffc900000070e0
R10: fffff52000000e23 R11: 1ffff92000000e1c R12: 0000000000000000
R13: 0000000000000046 R14: ffffffff8c11c460 R15: ffff888079eda8b0
FS:  00007f5b806386c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6eb2688710 CR3: 0000000055350000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lockdep_recursion_finish kernel/locking/lockdep.c:436 [inline]
 lock_is_held_type+0x100/0x190 kernel/locking/lockdep.c:5667
 perf_get_guest_cbs include/linux/perf_event.h:1274 [inline]
 perf_misc_flags+0x56/0x1b0 arch/x86/events/core.c:2961
 perf_prepare_sample+0x132/0x1cb0 kernel/events/core.c:7622
 __perf_event_output kernel/events/core.c:7802 [inline]
 perf_event_output_forward+0x146/0x280 kernel/events/core.c:7822
 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9515
 perf_swevent_overflow kernel/events/core.c:9591 [inline]
 perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9629
 perf_tp_event+0x32c/0xb50 kernel/events/core.c:10047
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
 perf_trace_preemptirq_template+0x2be/0x380 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:674
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 dd 13 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc90000007740 EFLAGS: 00000206
RAX: 4ec014f41f8a3e00 RBX: 1ffff92000000eec RCX: 4ec014f41f8a3e00
RDX: dffffc0000000000 RSI: ffffffff8a0b1620 RDI: ffffffff8a59a240
RBP: ffffc90000007820 R08: dffffc0000000000 R09: ffffed101720765a
R10: ffffed101720765a R11: 1ffff11017207659 R12: ffffffff8c120900
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:771 [inline]
 receive_mergeable drivers/net/virtio_net.c:1100 [inline]
 receive_buf+0x13e8/0x5770 drivers/net/virtio_net.c:1212
 virtnet_receive drivers/net/virtio_net.c:1504 [inline]
 virtnet_poll+0x546/0xef0 drivers/net/virtio_net.c:1617
 __napi_poll+0xc0/0x430 net/core/dev.c:7075
 napi_poll net/core/dev.c:7142 [inline]
 net_rx_action+0x4a8/0x9c0 net/core/dev.c:7232
 handle_softirqs+0x328/0x820 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:finish_lock_switch+0x134/0x280 kernel/sched/core.c:4804
Code: be ff ff ff ff e8 ec 7c 55 08 85 c0 74 4a 4d 85 ff 75 66 0f 1f 44 00 00 48 89 df e8 46 e7 5e 08 e8 71 75 2a 00 fb 48 83 c4 08 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 48 89 df e8 d9 0f fe ff 43 80 3c
RSP: 0018:ffffc900033af768 EFLAGS: 00000282
RAX: 4ec014f41f8a3e00 RBX: ffff8880b903a300 RCX: 4ec014f41f8a3e00
RDX: dffffc0000000000 RSI: ffffffff8a0b1620 RDI: ffffffff8a59a240
RBP: 1ffff1101720760b R08: dffffc0000000000 R09: ffffed101720765a
R10: ffffed101720765a R11: 1ffff11017207659 R12: 1ffff110172075b9
R13: dffffc0000000000 R14: ffff8880b903adc8 R15: 0000000000000000
 finish_task_switch+0x12f/0x640 kernel/sched/core.c:4921
 context_switch kernel/sched/core.c:5052 [inline]
 __schedule+0x11c3/0x4390 kernel/sched/core.c:6395
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799
 irqentry_exit+0x63/0x70 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__bad_area_nosemaphore+0x3f4/0x5a0 arch/x86/mm/fault.c:809
Code: f6 48 81 e6 00 02 00 00 31 ff e8 e7 d7 42 00 fa 49 81 e6 00 02 00 00 75 07 e8 f8 d3 42 00 eb 0a e8 f1 d3 42 00 e8 0c f6 48 00 <48> c7 44 24 60 0e 36 e0 45 4a c7 04 23 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc900033afb40 EFLAGS: 00000293
RAX: ffffffff8134f8f0 RBX: 1ffff92000675f74 RCX: ffff888079ed9dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900033afc30 R08: ffff888079ed9dc0 R09: 0000000000000011
R10: 0000000000000011 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: 1ffff92000675fa0 R15: 0000000000000000
 handle_page_fault arch/x86/mm/fault.c:1445 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:41 [inline]
RIP: 0010:strncpy_from_user+0x34a/0x360 lib/strncpy_from_user.c:139
Code: 0b e9 d9 fd ff ff 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c a9 fd ff ff 48 89 ef e8 82 fc c1 fd e9 9c fd ff ff e8 58 96 7d fd eb 80 <e8> 51 96 7d fd 4d 29 ec 48 89 eb e9 fe fe ff ff 00 00 cc cc 00 00
RSP: 0018:ffffc900033afd28 EFLAGS: 00050246
RAX: ffffffff83fa3251 RBX: ffff888055df0020 RCX: ffff888079ed9dc0
RDX: 0000000000000000 RSI: 0000000000000fe0 RDI: 0000000000000007
RBP: ffff888055df0020 R08: 0000000000000fe0 R09: 0000000000000020
R10: fffff940002aef81 R11: 1ffffd40002aef80 R12: 0000000000000fe0
R13: 0000000000000000 R14: 0000000000000fe0 R15: 0000000000000000
 getname_flags+0xef/0x500 fs/namei.c:149
 do_sys_openat2+0xcf/0x4a0 fs/open.c:1247
 do_sys_open fs/open.c:1269 [inline]
 __do_sys_openat fs/open.c:1285 [inline]
 __se_sys_openat fs/open.c:1280 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1280
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f5b823d0be9
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:00007f5b80638038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f5b82607fa0 RCX: 00007f5b823d0be9
RDX: 00000000001c1341 RSI: 0000000000000000 RDI: ffffffffffffff9c
RBP: 00007f5b82453e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5b82608038 R14: 00007f5b82607fa0 R15: 00007ffe746c3198
 </TASK>