rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-....: (1 GPs behind) idle=21f/1/0x4000000000000002 softirq=91038/91039 fqs=5247 
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P29370
	(detected by 1, t=10502 jiffies, g=98965, q=1641)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 29370 Comm: syz.4.8079 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:native_apic_msr_eoi_write+0xb/0x10 arch/x86/include/asm/apic.h:214
Code: 8b 06 bf f0 03 00 00 89 de 5b 41 5e 41 5f ff e0 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b9 0b 08 00 00 31 c0 31 d2 0f 30 <c3> 0f 1f 40 00 81 ff cf 00 00 00 7f 0c 83 ff 20 74 2a 83 ff 30 74
RSP: 0018:ffffc90000007d40 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffffff8be3f9c8 RCX: 000000000000080b
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000b0
RBP: 0000000000000000 R08: ffffffff8f106008 R09: ffffffff8f106018
R10: ffffffff8f106010 R11: ffffffff8f106003 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f26e51e26c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f6b75e9d90 CR3: 0000000064f52000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 apic_eoi arch/x86/include/asm/apic.h:400 [inline]
 ack_APIC_irq arch/x86/include/asm/apic.h:446 [inline]
 __sysvec_irq_work+0x51/0x240 arch/x86/kernel/irq_work.c:19
 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:713
RIP: 0010:ffs arch/x86/include/asm/bitops.h:297 [inline]
RIP: 0010:handle_softirqs+0x1a4/0x830 kernel/softirq.c:564
Code: 24 78 44 89 64 24 30 0f b7 db 48 c7 c7 e0 13 2a 8a e8 20 0a 78 08 65 66 c7 05 06 5d ba 7e 00 00 e8 71 04 36 00 fb 89 5c 24 3c <b8> ff ff ff ff 0f bc 44 24 3c 41 89 c6 41 ff c6 0f 85 d2 00 00 00
RSP: 0018:ffffc90000007e20 EFLAGS: 00000282
RAX: 2a7db38b4fd32a00 RBX: 0000000000000200 RCX: 2a7db38b4fd32a00
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a48c0
RBP: ffffc90000007f30 R08: ffffffff901f1187 R09: 1ffffffff203e230
R10: dffffc0000000000 R11: fffffbfff203e231 R12: 000000000000000a
R13: 0000000000000000 R14: ffff888020bc1dc0 R15: dffffc0000000000
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 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:rcu_read_unlock_special+0x0/0x4a0 kernel/rcu/tree_plugin.h:625
Code: 66 e4 58 00 eb b0 44 89 f1 80 e1 07 80 c1 03 38 c1 7c 94 49 89 fd 4c 89 f7 e8 4c e4 58 00 4c 89 ef eb 84 0f 1f 80 00 00 00 00 <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec a0 00
RSP: 0018:ffffc90002e4f248 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff888020bc21fc RCX: 0000000000080000
RDX: ffffc90013b11000 RSI: 000000000000529f RDI: ffff888020bc1dc0
RBP: ffffc90002e4f3b0 R08: ffffffff901f1187 R09: 1ffffffff203e230
R10: dffffc0000000000 R11: fffffbfff203e231 R12: 1ffff1100417843f
R13: ffff88803c1b25a8 R14: ffff888020bc2200 R15: dffffc0000000000
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 inet6_dump_fib+0x852/0xa60 net/ipv6/ip6_fib.c:711
 netlink_dump+0x6d2/0xdd0 net/netlink/af_netlink.c:2291
 __netlink_dump_start+0x4e4/0x720 net/netlink/af_netlink.c:2398
 netlink_dump_start include/linux/netlink.h:260 [inline]
 rtnetlink_rcv_msg+0xd91/0xf10 net/core/rtnetlink.c:5654
 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2519
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x78f/0x940 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:706 [inline]
 __sock_sendmsg net/socket.c:718 [inline]
 sock_write_iter+0x2a6/0x3a0 net/socket.c:1090
 call_write_iter include/linux/fs.h:2179 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x748/0xd70 fs/read_write.c:594
 ksys_write+0x153/0x260 fs/read_write.c:647
 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: 0033:0x7f26e6f8a159
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:00007f26e51e2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f26e7211fa0 RCX: 00007f26e6f8a159
RDX: 00000000000082d7 RSI: 0000200000000000 RDI: 0000000000000007
RBP: 00007f26e702106b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f26e7212038 R14: 00007f26e7211fa0 R15: 00007ffcb97a0038
 </TASK>
task:syz.4.8079      state:R  running task     stack:24496 pid:29370 ppid: 23196 flags:0x0000400c
Call Trace:
 <TASK>
 </TASK>