[v5.15] INFO: rcu detected stall in fib_nl_delrule (2)
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syzbot
Jul 3, 2026, 10:41:38 PMJul 3
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Hello,
syzbot found the following issue on:
HEAD commit: eceeec79dbc6 Linux 5.15.210
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=136be151580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6f8e2266b61925dc
dashboard link: https://syzkaller.appspot.com/bug?extid=c944e095db7e9be300e4
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/03366f3fc8c2/disk-eceeec79.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/19718022a397/vmlinux-eceeec79.xz
kernel image: https://storage.googleapis.com/syzbot-assets/642c77037a7f/bzImage-eceeec79.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c944e0...@syzkaller.appspotmail.com
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-....: (38 ticks this GP) idle=e87/1/0x4000000000000002 softirq=51231/51231 fqs=2109
(detected by 1, t=10505 jiffies, g=72133, q=1341)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 16914 Comm: syz.3.3937 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__lock_acquire+0xf1/0x7b50 kernel/locking/lockdep.c:4882
Code: 21 8b 8d 48 c1 e8 03 42 0f b6 04 00 84 c0 0f 85 2d 64 00 00 83 3d 92 43 2e 0c 00 0f 84 ee 26 00 00 83 3d 41 03 c2 0a 00 74 2a <4c> 89 e8 48 c1 e8 03 42 80 3c 00 00 74 12 4c 89 ef e8 79 34 61 00
RSP: 0018:ffffc90000006ca0 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 1ffff92000000db4
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8c31ef20
RBP: ffffc90000006ed0 R08: dffffc0000000000 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff1b15dc6 R12: 0000000000000000
R13: ffffffff8c31ef20 R14: 0000000000000000 R15: 0000000000000002
FS: 00007f1548b9b6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000034000 CR3: 0000000061e9a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313
rcu_read_lock include/linux/rcupdate.h:740 [inline]
__perf_output_begin kernel/events/ring_buffer.c:163 [inline]
perf_output_begin_forward+0xa5/0xa30 kernel/events/ring_buffer.c:271
__perf_event_output kernel/events/core.c:7804 [inline]
perf_event_output_forward+0x19b/0x2e0 kernel/events/core.c:7822
__perf_event_overflow+0x35f/0x550 kernel/events/core.c:9515
perf_tp_event+0x324/0xbe0 kernel/events/core.c:10047
perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
perf_trace_preemptirq_template+0x2aa/0x360 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+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
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 c2 22 9d 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900000077c0 EFLAGS: 00000206
RAX: 5d5369beb11f7e00 RBX: 1ffff92000000efc RCX: 5d5369beb11f7e00
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a2840
RBP: ffffc900000078a0 R08: ffffffff901e90c7 R09: 1ffffffff203d218
R10: dffffc0000000000 R11: fffffbfff203d219 R12: ffffffff8c323400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
__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+0x961/0xbd0 net/core/dev.c:5786
gro_normal_list net/core/dev.c:5939 [inline]
napi_complete_done+0x37e/0x850 net/core/dev.c:6677
virtqueue_napi_complete drivers/net/virtio_net.c:357 [inline]
virtnet_poll+0x8f5/0xe90 drivers/net/virtio_net.c:1624
__napi_poll+0xbb/0x430 net/core/dev.c:7101
napi_poll net/core/dev.c:7168 [inline]
net_rx_action+0x522/0xa80 net/core/dev.c:7258
handle_softirqs+0x336/0x830 kernel/softirq.c:576
__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:format_decode+0xbc4/0x1330 lib/vsprintf.c:2693
Code: 0f 85 d9 02 00 00 48 8b 44 24 18 0f b6 04 18 84 c0 0f 85 ea 02 00 00 48 8b 04 24 4c 89 28 49 ff c6 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 40 0f 85 db 00 00 00 45 29 e6 44 89 f0 48 83 c4 48 5b
RSP: 0018:ffffc90002d5e8b0 EFLAGS: 00000286
RAX: 5d5369beb11f7e00 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc900158d2000 RSI: 00000000000061ef RDI: 00000000000061f0
RBP: ffff0000ffffff00 R08: ffff88805cccbb80 R09: 0000000000000006
R10: 000000000000007a R11: 0000000000000002 R12: ffffffff8a2be282
R13: ffff0a00ffffff0f R14: ffffffff8a2be284 R15: 00000000ffffffb8
vsnprintf+0xef/0x1c20 lib/vsprintf.c:2763
snprintf+0xe5/0x140 lib/vsprintf.c:2944
print_caller kernel/printk/printk.c:1283 [inline]
info_print_prefix+0x1fa/0x360 kernel/printk/printk.c:1302
record_print_text kernel/printk/printk.c:1349 [inline]
console_unlock+0x650/0x10f0 kernel/printk/printk.c:2725
vprintk_emit+0xc0/0x150 kernel/printk/printk.c:2274
_printk+0xda/0x130 kernel/printk/printk.c:2299
validate_nla lib/nlattr.c:401 [inline]
__nla_validate_parse+0xc7f/0x27b0 lib/nlattr.c:613
__nla_parse+0x3c/0x50 lib/nlattr.c:710
__nlmsg_parse include/net/netlink.h:744 [inline]
nlmsg_parse_deprecated include/net/netlink.h:783 [inline]
fib_nl_delrule+0x31a/0x1ee0 net/core/fib_rules.c:884
rtnetlink_rcv_msg+0x82c/0xf00 net/core/rtnetlink.c:5688
netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2512
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x78f/0x940 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1923
sock_sendmsg_nosec net/socket.c:706 [inline]
__sock_sendmsg net/socket.c:718 [inline]
____sys_sendmsg+0x5be/0x8f0 net/socket.c:2446
___sys_sendmsg+0x236/0x2e0 net/socket.c:2500
__sys_sendmsg net/socket.c:2529 [inline]
__do_sys_sendmsg net/socket.c:2538 [inline]
__se_sys_sendmsg+0x1b7/0x2a0 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: 0033:0x7f154a942e59
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:00007f1548b9b028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f154abcafa0 RCX: 00007f154a942e59
RDX: 0000000000000000 RSI: 0000200000000940 RDI: 0000000000000009
RBP: 00007f154a9d8e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f154abcb038 R14: 00007f154abcafa0 R15: 00007fffdf748688
</TASK>
NMI backtrace for cpu 0
CPU: 0 PID: 16914 Comm: syz.3.3937 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:hlock_class kernel/locking/lockdep.c:192 [inline]
RIP: 0010:__lock_acquire+0x109b/0x7b50 kernel/locking/lockdep.c:5008
Code: 34 2e 0c 00 4c 8b 3c 24 0f 85 09 03 00 00 48 83 7c 24 48 00 0f 84 44 02 00 00 48 8b 44 24 68 48 8d 58 f8 48 89 d8 48 c1 e8 03 <42> 0f b6 04 00 84 c0 0f 85 21 5c 00 00 8b 03 89 c3 81 e3 ff 1f 00
RSP: 0018:ffffc90000006de0 EFLAGS: 00000802
RAX: 1ffff1100b9998dc RBX: ffff88805cccc6e0 RCX: 00000000d1f0fead
RDX: 000000008a86c2f9 RSI: 00000000f40f0ab6 RDI: ffffffff901e90c0
RBP: ffffc90000007010 R08: dffffc0000000000 R09: 1ffffffff203d218
R10: dffffc0000000000 R11: fffffbfff203d219 R12: 00000000317fc64f
R13: ffff88805cccbb80 R14: 000000004fe2bad8 R15: ffff88805cccc708
FS: 00007f1548b9b6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000034000 CR3: 0000000061e9a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313
rcu_read_lock include/linux/rcupdate.h:740 [inline]
__perf_event_output kernel/events/core.c:7800 [inline]
perf_event_output_forward+0xbc/0x2e0 kernel/events/core.c:7822
__perf_event_overflow+0x35f/0x550 kernel/events/core.c:9515
perf_tp_event+0x324/0xbe0 kernel/events/core.c:10047
perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
perf_trace_preemptirq_template+0x2aa/0x360 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+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
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 c2 22 9d 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900000077c0 EFLAGS: 00000206
RAX: 5d5369beb11f7e00 RBX: 1ffff92000000efc RCX: 5d5369beb11f7e00
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a2840
RBP: ffffc900000078a0 R08: ffffffff901e90c7 R09: 1ffffffff203d218
R10: dffffc0000000000 R11: fffffbfff203d219 R12: ffffffff8c323400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
__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+0x961/0xbd0 net/core/dev.c:5786
gro_normal_list net/core/dev.c:5939 [inline]
napi_complete_done+0x37e/0x850 net/core/dev.c:6677
virtqueue_napi_complete drivers/net/virtio_net.c:357 [inline]
virtnet_poll+0x8f5/0xe90 drivers/net/virtio_net.c:1624
__napi_poll+0xbb/0x430 net/core/dev.c:7101
napi_poll net/core/dev.c:7168 [inline]
net_rx_action+0x522/0xa80 net/core/dev.c:7258
handle_softirqs+0x336/0x830 kernel/softirq.c:576
__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:format_decode+0xbc4/0x1330 lib/vsprintf.c:2693
Code: 0f 85 d9 02 00 00 48 8b 44 24 18 0f b6 04 18 84 c0 0f 85 ea 02 00 00 48 8b 04 24 4c 89 28 49 ff c6 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 40 0f 85 db 00 00 00 45 29 e6 44 89 f0 48 83 c4 48 5b
RSP: 0018:ffffc90002d5e8b0 EFLAGS: 00000286
RAX: 5d5369beb11f7e00 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc900158d2000 RSI: 00000000000061ef RDI: 00000000000061f0
RBP: ffff0000ffffff00 R08: ffff88805cccbb80 R09: 0000000000000006
R10: 000000000000007a R11: 0000000000000002 R12: ffffffff8a2be282
R13: ffff0a00ffffff0f R14: ffffffff8a2be284 R15: 00000000ffffffb8
vsnprintf+0xef/0x1c20 lib/vsprintf.c:2763
snprintf+0xe5/0x140 lib/vsprintf.c:2944
print_caller kernel/printk/printk.c:1283 [inline]
info_print_prefix+0x1fa/0x360 kernel/printk/printk.c:1302
record_print_text kernel/printk/printk.c:1349 [inline]
console_unlock+0x650/0x10f0 kernel/printk/printk.c:2725
vprintk_emit+0xc0/0x150 kernel/printk/printk.c:2274
_printk+0xda/0x130 kernel/printk/printk.c:2299
validate_nla lib/nlattr.c:401 [inline]
__nla_validate_parse+0xc7f/0x27b0 lib/nlattr.c:613
__nla_parse+0x3c/0x50 lib/nlattr.c:710
__nlmsg_parse include/net/netlink.h:744 [inline]
nlmsg_parse_deprecated include/net/netlink.h:783 [inline]
fib_nl_delrule+0x31a/0x1ee0 net/core/fib_rules.c:884
rtnetlink_rcv_msg+0x82c/0xf00 net/core/rtnetlink.c:5688
netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2512
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x78f/0x940 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1923
sock_sendmsg_nosec net/socket.c:706 [inline]
__sock_sendmsg net/socket.c:718 [inline]
____sys_sendmsg+0x5be/0x8f0 net/socket.c:2446
___sys_sendmsg+0x236/0x2e0 net/socket.c:2500
__sys_sendmsg net/socket.c:2529 [inline]
__do_sys_sendmsg net/socket.c:2538 [inline]
__se_sys_sendmsg+0x1b7/0x2a0 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: 0033:0x7f154a942e59
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:00007f1548b9b028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f154abcafa0 RCX: 00007f154a942e59
RDX: 0000000000000000 RSI: 0000200000000940 RDI: 0000000000000009
RBP: 00007f154a9d8e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f154abcb038 R14: 00007f154abcafa0 R15: 00007fffdf748688
</TASK>
---
This report is generated by a bot. It may contain errors.
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If you want to overwrite report's subsystems, reply with:
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If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: eceeec79dbc6 Linux 5.15.210
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=136be151580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6f8e2266b61925dc
dashboard link: https://syzkaller.appspot.com/bug?extid=c944e095db7e9be300e4
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/03366f3fc8c2/disk-eceeec79.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/19718022a397/vmlinux-eceeec79.xz
kernel image: https://storage.googleapis.com/syzbot-assets/642c77037a7f/bzImage-eceeec79.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c944e0...@syzkaller.appspotmail.com
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-....: (38 ticks this GP) idle=e87/1/0x4000000000000002 softirq=51231/51231 fqs=2109
(detected by 1, t=10505 jiffies, g=72133, q=1341)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 16914 Comm: syz.3.3937 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__lock_acquire+0xf1/0x7b50 kernel/locking/lockdep.c:4882
Code: 21 8b 8d 48 c1 e8 03 42 0f b6 04 00 84 c0 0f 85 2d 64 00 00 83 3d 92 43 2e 0c 00 0f 84 ee 26 00 00 83 3d 41 03 c2 0a 00 74 2a <4c> 89 e8 48 c1 e8 03 42 80 3c 00 00 74 12 4c 89 ef e8 79 34 61 00
RSP: 0018:ffffc90000006ca0 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 1ffff92000000db4
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8c31ef20
RBP: ffffc90000006ed0 R08: dffffc0000000000 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff1b15dc6 R12: 0000000000000000
R13: ffffffff8c31ef20 R14: 0000000000000000 R15: 0000000000000002
FS: 00007f1548b9b6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000034000 CR3: 0000000061e9a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313
rcu_read_lock include/linux/rcupdate.h:740 [inline]
__perf_output_begin kernel/events/ring_buffer.c:163 [inline]
perf_output_begin_forward+0xa5/0xa30 kernel/events/ring_buffer.c:271
__perf_event_output kernel/events/core.c:7804 [inline]
perf_event_output_forward+0x19b/0x2e0 kernel/events/core.c:7822
__perf_event_overflow+0x35f/0x550 kernel/events/core.c:9515
perf_tp_event+0x324/0xbe0 kernel/events/core.c:10047
perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
perf_trace_preemptirq_template+0x2aa/0x360 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+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
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 c2 22 9d 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900000077c0 EFLAGS: 00000206
RAX: 5d5369beb11f7e00 RBX: 1ffff92000000efc RCX: 5d5369beb11f7e00
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a2840
RBP: ffffc900000078a0 R08: ffffffff901e90c7 R09: 1ffffffff203d218
R10: dffffc0000000000 R11: fffffbfff203d219 R12: ffffffff8c323400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
__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+0x961/0xbd0 net/core/dev.c:5786
gro_normal_list net/core/dev.c:5939 [inline]
napi_complete_done+0x37e/0x850 net/core/dev.c:6677
virtqueue_napi_complete drivers/net/virtio_net.c:357 [inline]
virtnet_poll+0x8f5/0xe90 drivers/net/virtio_net.c:1624
__napi_poll+0xbb/0x430 net/core/dev.c:7101
napi_poll net/core/dev.c:7168 [inline]
net_rx_action+0x522/0xa80 net/core/dev.c:7258
handle_softirqs+0x336/0x830 kernel/softirq.c:576
__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:format_decode+0xbc4/0x1330 lib/vsprintf.c:2693
Code: 0f 85 d9 02 00 00 48 8b 44 24 18 0f b6 04 18 84 c0 0f 85 ea 02 00 00 48 8b 04 24 4c 89 28 49 ff c6 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 40 0f 85 db 00 00 00 45 29 e6 44 89 f0 48 83 c4 48 5b
RSP: 0018:ffffc90002d5e8b0 EFLAGS: 00000286
RAX: 5d5369beb11f7e00 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc900158d2000 RSI: 00000000000061ef RDI: 00000000000061f0
RBP: ffff0000ffffff00 R08: ffff88805cccbb80 R09: 0000000000000006
R10: 000000000000007a R11: 0000000000000002 R12: ffffffff8a2be282
R13: ffff0a00ffffff0f R14: ffffffff8a2be284 R15: 00000000ffffffb8
vsnprintf+0xef/0x1c20 lib/vsprintf.c:2763
snprintf+0xe5/0x140 lib/vsprintf.c:2944
print_caller kernel/printk/printk.c:1283 [inline]
info_print_prefix+0x1fa/0x360 kernel/printk/printk.c:1302
record_print_text kernel/printk/printk.c:1349 [inline]
console_unlock+0x650/0x10f0 kernel/printk/printk.c:2725
vprintk_emit+0xc0/0x150 kernel/printk/printk.c:2274
_printk+0xda/0x130 kernel/printk/printk.c:2299
validate_nla lib/nlattr.c:401 [inline]
__nla_validate_parse+0xc7f/0x27b0 lib/nlattr.c:613
__nla_parse+0x3c/0x50 lib/nlattr.c:710
__nlmsg_parse include/net/netlink.h:744 [inline]
nlmsg_parse_deprecated include/net/netlink.h:783 [inline]
fib_nl_delrule+0x31a/0x1ee0 net/core/fib_rules.c:884
rtnetlink_rcv_msg+0x82c/0xf00 net/core/rtnetlink.c:5688
netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2512
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x78f/0x940 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1923
sock_sendmsg_nosec net/socket.c:706 [inline]
__sock_sendmsg net/socket.c:718 [inline]
____sys_sendmsg+0x5be/0x8f0 net/socket.c:2446
___sys_sendmsg+0x236/0x2e0 net/socket.c:2500
__sys_sendmsg net/socket.c:2529 [inline]
__do_sys_sendmsg net/socket.c:2538 [inline]
__se_sys_sendmsg+0x1b7/0x2a0 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: 0033:0x7f154a942e59
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:00007f1548b9b028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f154abcafa0 RCX: 00007f154a942e59
RDX: 0000000000000000 RSI: 0000200000000940 RDI: 0000000000000009
RBP: 00007f154a9d8e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f154abcb038 R14: 00007f154abcafa0 R15: 00007fffdf748688
</TASK>
NMI backtrace for cpu 0
CPU: 0 PID: 16914 Comm: syz.3.3937 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:hlock_class kernel/locking/lockdep.c:192 [inline]
RIP: 0010:__lock_acquire+0x109b/0x7b50 kernel/locking/lockdep.c:5008
Code: 34 2e 0c 00 4c 8b 3c 24 0f 85 09 03 00 00 48 83 7c 24 48 00 0f 84 44 02 00 00 48 8b 44 24 68 48 8d 58 f8 48 89 d8 48 c1 e8 03 <42> 0f b6 04 00 84 c0 0f 85 21 5c 00 00 8b 03 89 c3 81 e3 ff 1f 00
RSP: 0018:ffffc90000006de0 EFLAGS: 00000802
RAX: 1ffff1100b9998dc RBX: ffff88805cccc6e0 RCX: 00000000d1f0fead
RDX: 000000008a86c2f9 RSI: 00000000f40f0ab6 RDI: ffffffff901e90c0
RBP: ffffc90000007010 R08: dffffc0000000000 R09: 1ffffffff203d218
R10: dffffc0000000000 R11: fffffbfff203d219 R12: 00000000317fc64f
R13: ffff88805cccbb80 R14: 000000004fe2bad8 R15: ffff88805cccc708
FS: 00007f1548b9b6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000034000 CR3: 0000000061e9a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313
rcu_read_lock include/linux/rcupdate.h:740 [inline]
__perf_event_output kernel/events/core.c:7800 [inline]
perf_event_output_forward+0xbc/0x2e0 kernel/events/core.c:7822
__perf_event_overflow+0x35f/0x550 kernel/events/core.c:9515
perf_tp_event+0x324/0xbe0 kernel/events/core.c:10047
perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
perf_trace_preemptirq_template+0x2aa/0x360 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+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
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 c2 22 9d 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900000077c0 EFLAGS: 00000206
RAX: 5d5369beb11f7e00 RBX: 1ffff92000000efc RCX: 5d5369beb11f7e00
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a2840
RBP: ffffc900000078a0 R08: ffffffff901e90c7 R09: 1ffffffff203d218
R10: dffffc0000000000 R11: fffffbfff203d219 R12: ffffffff8c323400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
__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+0x961/0xbd0 net/core/dev.c:5786
gro_normal_list net/core/dev.c:5939 [inline]
napi_complete_done+0x37e/0x850 net/core/dev.c:6677
virtqueue_napi_complete drivers/net/virtio_net.c:357 [inline]
virtnet_poll+0x8f5/0xe90 drivers/net/virtio_net.c:1624
__napi_poll+0xbb/0x430 net/core/dev.c:7101
napi_poll net/core/dev.c:7168 [inline]
net_rx_action+0x522/0xa80 net/core/dev.c:7258
handle_softirqs+0x336/0x830 kernel/softirq.c:576
__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:format_decode+0xbc4/0x1330 lib/vsprintf.c:2693
Code: 0f 85 d9 02 00 00 48 8b 44 24 18 0f b6 04 18 84 c0 0f 85 ea 02 00 00 48 8b 04 24 4c 89 28 49 ff c6 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 40 0f 85 db 00 00 00 45 29 e6 44 89 f0 48 83 c4 48 5b
RSP: 0018:ffffc90002d5e8b0 EFLAGS: 00000286
RAX: 5d5369beb11f7e00 RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc900158d2000 RSI: 00000000000061ef RDI: 00000000000061f0
RBP: ffff0000ffffff00 R08: ffff88805cccbb80 R09: 0000000000000006
R10: 000000000000007a R11: 0000000000000002 R12: ffffffff8a2be282
R13: ffff0a00ffffff0f R14: ffffffff8a2be284 R15: 00000000ffffffb8
vsnprintf+0xef/0x1c20 lib/vsprintf.c:2763
snprintf+0xe5/0x140 lib/vsprintf.c:2944
print_caller kernel/printk/printk.c:1283 [inline]
info_print_prefix+0x1fa/0x360 kernel/printk/printk.c:1302
record_print_text kernel/printk/printk.c:1349 [inline]
console_unlock+0x650/0x10f0 kernel/printk/printk.c:2725
vprintk_emit+0xc0/0x150 kernel/printk/printk.c:2274
_printk+0xda/0x130 kernel/printk/printk.c:2299
validate_nla lib/nlattr.c:401 [inline]
__nla_validate_parse+0xc7f/0x27b0 lib/nlattr.c:613
__nla_parse+0x3c/0x50 lib/nlattr.c:710
__nlmsg_parse include/net/netlink.h:744 [inline]
nlmsg_parse_deprecated include/net/netlink.h:783 [inline]
fib_nl_delrule+0x31a/0x1ee0 net/core/fib_rules.c:884
rtnetlink_rcv_msg+0x82c/0xf00 net/core/rtnetlink.c:5688
netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2512
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x78f/0x940 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1923
sock_sendmsg_nosec net/socket.c:706 [inline]
__sock_sendmsg net/socket.c:718 [inline]
____sys_sendmsg+0x5be/0x8f0 net/socket.c:2446
___sys_sendmsg+0x236/0x2e0 net/socket.c:2500
__sys_sendmsg net/socket.c:2529 [inline]
__do_sys_sendmsg net/socket.c:2538 [inline]
__se_sys_sendmsg+0x1b7/0x2a0 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: 0033:0x7f154a942e59
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:00007f1548b9b028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f154abcafa0 RCX: 00007f154a942e59
RDX: 0000000000000000 RSI: 0000200000000940 RDI: 0000000000000009
RBP: 00007f154a9d8e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f154abcb038 R14: 00007f154abcafa0 R15: 00007fffdf748688
</TASK>
---
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