rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-....: (16 ticks this GP) idle=255/1/0x4000000000000000 softirq=46459/46461 fqs=5246 
	(detected by 1, t=10502 jiffies, g=66549, q=1148)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 16217 Comm: syz.3.3319 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:asm_sysvec_irq_work+0x0/0x20 arch/x86/include/asm/idtentry.h:707
Code: e9 a5 03 00 00 90 90 90 90 90 0f 01 ca fc 6a ff e8 a5 02 00 00 48 89 c4 48 89 e7 e8 8a 41 e9 ff e9 85 03 00 00 90 90 90 90 90 <0f> 01 ca fc 6a ff e8 85 02 00 00 48 89 c4 48 89 e7 e8 5a 46 e9 ff
RSP: 0018:ffffc90000007778 EFLAGS: 00000006
RAX: 4fa2ad746e10d600 RBX: 1ffff92000000ef8 RCX: 4fa2ad746e10d600
RDX: dffffc0000000000 RSI: ffffffff8a0b1c60 RDI: ffffffff8a59e580
RBP: ffffc90000007880 R08: dffffc0000000000 R09: fffffbfff1ff7c1d
R10: fffffbfff1ff7c1d R11: 1ffffffff1ff7c1c R12: ffffffff8c120c00
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007f764c7516c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c361a82 CR3: 0000000063738000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
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 ed 11 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:ffffc900000077a0 EFLAGS: 00000206
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 netif_receive_skb_list_internal+0x93a/0xb90 net/core/dev.c:5760
 gro_normal_list net/core/dev.c:5913 [inline]
 napi_complete_done+0x37d/0x830 net/core/dev.c:6651
 virtqueue_napi_complete drivers/net/virtio_net.c:357 [inline]
 virtnet_poll+0x912/0xef0 drivers/net/virtio_net.c:1624
 __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 7c fc 55 08 85 c0 74 4a 4d 85 ff 75 66 0f 1f 44 00 00 48 89 df e8 76 67 5f 08 e8 11 76 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:ffffc90000d26608 EFLAGS: 00000282
RAX: 4fa2ad746e10d600 RBX: ffff8880b903a340 RCX: 4fa2ad746e10d600
RDX: dffffc0000000000 RSI: ffffffff8a0b1c60 RDI: ffffffff8a59e580
RBP: 1ffff11017207613 R08: dffffc0000000000 R09: fffffbfff1ff7c1d
R10: fffffbfff1ff7c1d R11: 1ffffffff1ff7c1c R12: 1ffff110172075c1
R13: dffffc0000000000 R14: ffff8880b903ae08 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:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:226 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp8+0x4/0x80 kernel/kcov.c:273
Code: 77 22 89 ff 89 f6 4a c7 44 02 08 04 00 00 00 4a 89 7c 02 10 4a 89 74 02 18 4a 89 44 02 20 48 ff c1 48 89 0a c3 90 48 8b 04 24 <65> 48 8b 0d c4 a1 8a 7e 65 8b 15 c5 a1 8a 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc90000d269f8 EFLAGS: 00000286
RAX: ffffffff83f7ac19 RBX: 92822ac18a7a9820 RCX: 00000000b684e5a0
RDX: ffffc90016515000 RSI: 1c5e91c10e5be9c0 RDI: 929d881fd8df3522
RBP: 929d881fd8df3522 R08: ffff88807a303b80 R09: 0000000000000003
R10: 0000000000000002 R11: 0000000000000002 R12: 670af5c186222b6c
R13: 16e591830b606d8e R14: 1ffff1100f5d51a9 R15: 1c5e91c10e5be9c0
 mpihelp_addmul_1+0xc9/0x190 lib/mpi/generic_mpih-mul2.c:36
 mpih_sqr_n_basecase+0x3dc/0x440 lib/mpi/mpih-mul.c:237
 mpih_sqr_n+0x585/0x9f0 lib/mpi/mpih-mul.c:304
 mpih_sqr_n+0x5a0/0x9f0 lib/mpi/mpih-mul.c:304
 mpi_powm+0x1386/0x2340 lib/mpi/mpi-pow.c:200
 _rsa_enc crypto/rsa.c:32 [inline]
 rsa_enc+0x28d/0x3c0 crypto/rsa.c:75
 crypto_akcipher_encrypt include/crypto/akcipher.h:296 [inline]
 pkcs1pad_verify+0x465/0x680 crypto/rsa-pkcs1pad.c:558
 crypto_akcipher_verify include/crypto/akcipher.h:370 [inline]
 public_key_verify_signature+0x84f/0xcd0 crypto/asymmetric_keys/public_key.c:460
 pkcs7_verify_one crypto/asymmetric_keys/pkcs7_verify.c:357 [inline]
 pkcs7_verify+0x414/0x1360 crypto/asymmetric_keys/pkcs7_verify.c:445
 verify_pkcs7_message_sig+0xf4/0x2a0 certs/system_keyring.c:200
 verify_pkcs7_signature+0x66/0x90 certs/system_keyring.c:283
 regdb_has_valid_signature net/wireless/reg.c:820 [inline]
 valid_regdb+0x1e1/0x5e0 net/wireless/reg.c:864
 reg_reload_regdb+0xe0/0x1d0 net/wireless/reg.c:1117
 genl_family_rcv_msg_doit net/netlink/genetlink.c:731 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:775 [inline]
 genl_rcv_msg+0xbc6/0xf40 net/netlink/genetlink.c:792
 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2507
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x8ab/0xbc0 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:706 [inline]
 __sock_sendmsg net/socket.c:718 [inline]
 ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2446
 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2500
 __sys_sendmsg net/socket.c:2529 [inline]
 __do_sys_sendmsg net/socket.c:2538 [inline]
 __se_sys_sendmsg+0x190/0x250 net/socket.c:2536
 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: 0033:0x7f764e50b6c9
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:00007f764c751038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f764e762090 RCX: 00007f764e50b6c9
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 000000000000000a
RBP: 00007f764e58df91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f764e762128 R14: 00007f764e762090 R15: 00007ffcae1a7c48
 </TASK>