rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2655 jiffies s: 941 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: 4405 Comm: syz.3.11 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:178 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:241 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x1b/0x80 kernel/kcov.c:316
Code: 7c 11 10 48 89 74 11 18 48 89 44 11 20 c3 90 48 8b 04 24 65 48 8b 0d c4 29 80 7e 65 8b 15 c5 29 80 7e 81 e2 00 01 ff 00 74 11 <81> fa 00 01 00 00 75 57 83 b9 1c 16 00 00 00 74 4e 8b 91 f8 15 00
RSP: 0018:ffffc900001e0a08 EFLAGS: 00000006
RAX: ffffffff81a564b6 RBX: 0000000000000100 RCX: ffff88802d1b3c00
RDX: 0000000000000100 RSI: 0000000000000100 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffff8880b8f357cb R09: 1ffff110171e6af9
R10: dffffc0000000000 R11: ffffed10171e6afa R12: ffffffff8cb80400
R13: dffffc0000000000 R14: ffff8880b8f00000 R15: dffffc0000000000
FS:  00007f575f7176c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3001cff8 CR3: 000000005814c000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 interrupt_context_level include/linux/preempt.h:97 [inline]
 get_recursion_context kernel/events/internal.h:214 [inline]
 perf_swevent_get_recursion_context+0xa6/0x150 kernel/events/core.c:9765
 perf_trace_buf_alloc+0x54/0x300 kernel/trace/trace_event_perf.c:414
 perf_trace_preemptirq_template+0x143/0x320 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 12 6c 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900001e0c40 EFLAGS: 00000206
RAX: 736baf42186b4600 RBX: 1ffff9200003c190 RCX: 736baf42186b4600
RDX: dffffc0000000000 RSI: ffffffff8a8c18a0 RDI: ffffffff8adf6420
RBP: ffffc900001e0d30 R08: ffffffff90b1327f R09: 1ffffffff216264f
R10: dffffc0000000000 R11: fffffbfff2162650 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3bb00 R15: 0000000000000002
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 rebalance_domains+0x86f/0x9d0 kernel/sched/fair.c:11051
 handle_softirqs+0x291/0x910 kernel/softirq.c:596
 __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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:PageTail include/linux/page-flags.h:292 [inline]
RIP: 0010:folio_flags include/linux/page-flags.h:319 [inline]
RIP: 0010:folio_test_slab include/linux/page-flags.h:487 [inline]
RIP: 0010:kfree+0x6e/0x1a0 mm/slab_common.c:981
Code: e8 06 48 83 e0 c0 48 ba 00 00 00 00 00 ea ff ff 48 8b 4c 10 08 f6 c1 01 0f 85 0c 01 00 00 48 01 d0 0f 1f 44 00 00 48 8b 48 08 <f6> c1 01 0f 85 13 01 00 00 0f 1f 44 00 00 48 f7 00 00 02 00 00 74
RSP: 0018:ffffc90004aa73a0 EFLAGS: 00000286
RAX: ffffea0000aa7100 RBX: ffff88802a9c6800 RCX: ffffea0000a7f400
RDX: ffffea0000000000 RSI: 000000000000c0da RDI: 000000000000c0db
RBP: dffffc0000000000 R08: ffffffff8e2116af R09: 1ffffffff1c422d5
R10: dffffc0000000000 R11: fffffbfff1c422d6 R12: ffff88802dfe8cfe
R13: ffff88802dfe8c80 R14: ffffffff882f3a69 R15: ffff88802a9c6800
 skb_free_head net/core/skbuff.c:762 [inline]
 skb_release_data+0x5e9/0x7e0 net/core/skbuff.c:791
 skb_release_all net/core/skbuff.c:856 [inline]
 __kfree_skb net/core/skbuff.c:870 [inline]
 consume_skb+0xa2/0x100 net/core/skbuff.c:1035
 netlink_broadcast+0xffd/0x10f0 net/netlink/af_netlink.c:1526
 nlmsg_multicast include/net/netlink.h:1078 [inline]
 nlmsg_notify+0xe3/0x1a0 net/netlink/af_netlink.c:2559
 fib_table_delete+0xcce/0xfc0 net/ipv4/fib_trie.c:1746
 fib_magic+0x2ea/0x3b0 net/ipv4/fib_frontend.c:1120
 fib_del_ifaddr+0x277/0x14c0 net/ipv4/fib_frontend.c:1231
 fib_inetaddr_event+0xb7/0x1c0 net/ipv4/fib_frontend.c:1462
 notifier_call_chain kernel/notifier.c:87 [inline]
 blocking_notifier_call_chain+0x103/0x1b0 kernel/notifier.c:382
 __inet_del_ifa+0xaac/0x1090 net/ipv4/devinet.c:445
 inet_del_ifa net/ipv4/devinet.c:482 [inline]
 devinet_ioctl+0x954/0x1bf0 net/ipv4/devinet.c:1180
 inet_ioctl+0x2fa/0x460 net/ipv4/af_inet.c:1008
 sock_do_ioctl+0xfb/0x320 net/socket.c:1202
 sock_ioctl+0x48a/0x700 net/socket.c:1321
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
 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: 0033:0x7f575e79e159
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:00007f575f717028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f575ea25fa0 RCX: 00007f575e79e159
RDX: 0000200000000040 RSI: 0000000000008916 RDI: 0000000000000007
RBP: 00007f575e835024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f575ea26038 R14: 00007f575ea25fa0 R15: 00007fff72368358
 </TASK>