[v6.1] INFO: rcu detected stall in dev_ifconf
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syzbot
Jul 29, 2026, 6:05:44 AMJul 29
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Hello,
syzbot found the following issue on:
HEAD commit: dc5c83b7f5f8 Linux 6.1.178
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=13ff31b9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=31dfefc4a14efea3
dashboard link: https://syzkaller.appspot.com/bug?extid=0853e94e63298311f728
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/20011e25c344/disk-dc5c83b7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/da97f6113bb4/vmlinux-dc5c83b7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3d98353da44a/bzImage-dc5c83b7.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0853e9...@syzkaller.appspotmail.com
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 ticks this GP) idle=fda4/1/0x4000000000000002 softirq=105310/105310 fqs=0
(detected by 1, t=10502 jiffies, g=166017, q=198 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 24122 Comm: syz.2.5905 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:perf_prepare_sample+0x18b/0x2020 kernel/events/core.c:7538
Code: 08 4c 89 ff e8 06 b1 2e 00 4d 8b 2f 4c 89 6c 24 20 49 f7 d5 4d 21 f5 48 89 df 4c 89 fe 48 8b 54 24 30 4c 89 e9 e8 15 c1 ff ff <4c> 89 f6 48 81 e6 01 00 80 00 31 ff e8 f4 87 dd ff 4c 89 f0 48 25
RSP: 0018:ffffc900000072e0 EFLAGS: 00000082
RAX: ffffffff81a47501 RBX: ffffc90000007480 RCX: ffff8880242dbc00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900000073d0 R08: ffffc90000007457 R09: ffffc90000007420
R10: dffffc0000000000 R11: fffff52000000e8b R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000100 R15: ffffc900000076c0
FS: 00007fbdc1ef56c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbdc0feb580 CR3: 0000000077b91000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
__perf_event_output kernel/events/core.c:7730 [inline]
perf_event_output_forward+0x197/0x2f0 kernel/events/core.c:7750
__perf_event_overflow+0x457/0x630 kernel/events/core.c:9496
perf_swevent_overflow kernel/events/core.c:9579 [inline]
perf_swevent_event+0x315/0x570 kernel/events/core.c:9630
perf_tp_event+0x36b/0xc10 kernel/events/core.c:10064
perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10032
perf_trace_preemptirq_template+0x268/0x320 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 a2 7c 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:ffffc90000007ae0 EFLAGS: 00000206
RAX: c95a4a35e7f76800 RBX: 1ffff92000000f64 RCX: c95a4a35e7f76800
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adf5de0
RBP: ffffc90000007bd0 R08: ffffffff90b0f2cf R09: 1ffffffff2161e59
R10: dffffc0000000000 R11: fffffbfff2161e5a R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8e3bb00 R15: 0000000000000001
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
__run_hrtimer kernel/time/hrtimer.c:1751 [inline]
__hrtimer_run_queues+0x522/0xc90 kernel/time/hrtimer.c:1815
hrtimer_run_softirq+0x173/0x290 kernel/time/hrtimer.c:1832
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:__list_add_valid+0x5d/0xe0 lib/list_debug.c:30
Code: 89 e0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 58 44 b9 fd 49 8b 14 24 4c 39 f2 75 67 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 <74> 08 4c 89 f7 e8 39 44 b9 fd 49 8b 16 48 39 da 75 5d 4d 39 f7 74
RSP: 0018:ffffc900033c7b70 EFLAGS: 00000246
RAX: 1ffff9200094ff48 RBX: ffffffff8dd5b950 RCX: c95a4a35e7f76800
RDX: ffffc90004a7fa40 RSI: ffffc90004a7fa40 RDI: ffffc900033c7c40
RBP: ffffc900033c7cf0 R08: ffffffff8dd5b907 R09: 1ffffffff1bab720
R10: dffffc0000000000 R11: fffffbfff1bab721 R12: ffffffff8dd5b958
R13: dffffc0000000000 R14: ffffc90004a7fa40 R15: ffffc900033c7c40
__list_add include/linux/list.h:69 [inline]
list_add_tail include/linux/list.h:102 [inline]
__mutex_add_waiter kernel/locking/mutex.c:210 [inline]
__mutex_lock_common kernel/locking/mutex.c:637 [inline]
__mutex_lock+0x2f8/0xae0 kernel/locking/mutex.c:747
dev_ifconf+0x19e/0x300 net/core/dev_ioctl.c:66
sock_ioctl+0x286/0x700 net/socket.c:1317
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: 0033:0x7fbdc0f9de99
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:00007fbdc1ef5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbdc1225fa0 RCX: 00007fbdc0f9de99
RDX: 0000200000000080 RSI: 0000000000008912 RDI: 0000000000000004
RBP: 00007fbdc1033eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbdc1226038 R14: 00007fbdc1225fa0 R15: 00007ffce35cb018
</TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g166017 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=92381
rcu: rcu_preempt kthread starved for 10502 jiffies! g166017 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:I stack:26800 pid:16 ppid:2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0x107f/0x4030 kernel/sched/core.c:6563
schedule+0xb9/0x180 kernel/sched/core.c:6639
schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x303/0x1350 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x99/0x3b0 kernel/rcu/tree.c:1905
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 24122 Comm: syz.2.5905 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:hlock_class kernel/locking/lockdep.c:-1 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4728 [inline]
RIP: 0010:__lock_acquire+0x566/0x7c40 kernel/locking/lockdep.c:5013
Code: 00 00 00 e8 8c 5e 6f 00 48 0f a3 1d 84 ee 4c 0f 73 1f 48 8d 04 5b c1 e0 06 48 8d 98 00 71 49 90 48 ba 00 00 00 00 00 fc ff df <4c> 8b 64 24 10 eb 35 48 c7 c0 40 61 c1 96 48 c1 e8 03 48 ba 00 00
RSP: 0018:ffffc90000007060 EFLAGS: 00000006
RAX: 00000000000021c0 RBX: ffffffff904992c0 RCX: ffffffff816403b4
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffffff90b0f240
RBP: ffffc90000007290 R08: ffffffff90b0f247 R09: 1ffffffff2161e48
R10: dffffc0000000000 R11: fffffbfff2161e49 R12: 0000000000000000
R13: ffff8880242dbc00 R14: 0000000000000000 R15: ffff8880242dc778
FS: 00007fbdc1ef56c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbdc0feb580 CR3: 0000000077b91000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676
rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
rcu_read_lock include/linux/rcupdate.h:791 [inline]
__perf_event_output kernel/events/core.c:7728 [inline]
perf_event_output_forward+0xdf/0x2f0 kernel/events/core.c:7750
__perf_event_overflow+0x457/0x630 kernel/events/core.c:9496
perf_swevent_overflow kernel/events/core.c:9579 [inline]
perf_swevent_event+0x315/0x570 kernel/events/core.c:9630
perf_tp_event+0x36b/0xc10 kernel/events/core.c:10064
perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10032
perf_trace_preemptirq_template+0x268/0x320 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 a2 7c 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:ffffc90000007ae0 EFLAGS: 00000206
RAX: c95a4a35e7f76800 RBX: 1ffff92000000f64 RCX: c95a4a35e7f76800
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adf5de0
RBP: ffffc90000007bd0 R08: ffffffff90b0f2cf R09: 1ffffffff2161e59
R10: dffffc0000000000 R11: fffffbfff2161e5a R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8e3bb00 R15: 0000000000000001
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
__run_hrtimer kernel/time/hrtimer.c:1751 [inline]
__hrtimer_run_queues+0x522/0xc90 kernel/time/hrtimer.c:1815
hrtimer_run_softirq+0x173/0x290 kernel/time/hrtimer.c:1832
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:__list_add_valid+0x5d/0xe0 lib/list_debug.c:30
Code: 89 e0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 58 44 b9 fd 49 8b 14 24 4c 39 f2 75 67 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 <74> 08 4c 89 f7 e8 39 44 b9 fd 49 8b 16 48 39 da 75 5d 4d 39 f7 74
RSP: 0018:ffffc900033c7b70 EFLAGS: 00000246
RAX: 1ffff9200094ff48 RBX: ffffffff8dd5b950 RCX: c95a4a35e7f76800
RDX: ffffc90004a7fa40 RSI: ffffc90004a7fa40 RDI: ffffc900033c7c40
RBP: ffffc900033c7cf0 R08: ffffffff8dd5b907 R09: 1ffffffff1bab720
R10: dffffc0000000000 R11: fffffbfff1bab721 R12: ffffffff8dd5b958
R13: dffffc0000000000 R14: ffffc90004a7fa40 R15: ffffc900033c7c40
__list_add include/linux/list.h:69 [inline]
list_add_tail include/linux/list.h:102 [inline]
__mutex_add_waiter kernel/locking/mutex.c:210 [inline]
__mutex_lock_common kernel/locking/mutex.c:637 [inline]
__mutex_lock+0x2f8/0xae0 kernel/locking/mutex.c:747
dev_ifconf+0x19e/0x300 net/core/dev_ioctl.c:66
sock_ioctl+0x286/0x700 net/socket.c:1317
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: 0033:0x7fbdc0f9de99
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:00007fbdc1ef5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbdc1225fa0 RCX: 00007fbdc0f9de99
RDX: 0000200000000080 RSI: 0000000000008912 RDI: 0000000000000004
RBP: 00007fbdc1033eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbdc1226038 R14: 00007fbdc1225fa0 R15: 00007ffce35cb018
</TASK>
---
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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: dc5c83b7f5f8 Linux 6.1.178
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=13ff31b9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=31dfefc4a14efea3
dashboard link: https://syzkaller.appspot.com/bug?extid=0853e94e63298311f728
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/20011e25c344/disk-dc5c83b7.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/da97f6113bb4/vmlinux-dc5c83b7.xz
kernel image: https://storage.googleapis.com/syzbot-assets/3d98353da44a/bzImage-dc5c83b7.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0853e9...@syzkaller.appspotmail.com
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 ticks this GP) idle=fda4/1/0x4000000000000002 softirq=105310/105310 fqs=0
(detected by 1, t=10502 jiffies, g=166017, q=198 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 24122 Comm: syz.2.5905 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:perf_prepare_sample+0x18b/0x2020 kernel/events/core.c:7538
Code: 08 4c 89 ff e8 06 b1 2e 00 4d 8b 2f 4c 89 6c 24 20 49 f7 d5 4d 21 f5 48 89 df 4c 89 fe 48 8b 54 24 30 4c 89 e9 e8 15 c1 ff ff <4c> 89 f6 48 81 e6 01 00 80 00 31 ff e8 f4 87 dd ff 4c 89 f0 48 25
RSP: 0018:ffffc900000072e0 EFLAGS: 00000082
RAX: ffffffff81a47501 RBX: ffffc90000007480 RCX: ffff8880242dbc00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900000073d0 R08: ffffc90000007457 R09: ffffc90000007420
R10: dffffc0000000000 R11: fffff52000000e8b R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000100 R15: ffffc900000076c0
FS: 00007fbdc1ef56c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbdc0feb580 CR3: 0000000077b91000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
__perf_event_output kernel/events/core.c:7730 [inline]
perf_event_output_forward+0x197/0x2f0 kernel/events/core.c:7750
__perf_event_overflow+0x457/0x630 kernel/events/core.c:9496
perf_swevent_overflow kernel/events/core.c:9579 [inline]
perf_swevent_event+0x315/0x570 kernel/events/core.c:9630
perf_tp_event+0x36b/0xc10 kernel/events/core.c:10064
perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10032
perf_trace_preemptirq_template+0x268/0x320 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 a2 7c 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:ffffc90000007ae0 EFLAGS: 00000206
RAX: c95a4a35e7f76800 RBX: 1ffff92000000f64 RCX: c95a4a35e7f76800
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adf5de0
RBP: ffffc90000007bd0 R08: ffffffff90b0f2cf R09: 1ffffffff2161e59
R10: dffffc0000000000 R11: fffffbfff2161e5a R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8e3bb00 R15: 0000000000000001
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
__run_hrtimer kernel/time/hrtimer.c:1751 [inline]
__hrtimer_run_queues+0x522/0xc90 kernel/time/hrtimer.c:1815
hrtimer_run_softirq+0x173/0x290 kernel/time/hrtimer.c:1832
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:__list_add_valid+0x5d/0xe0 lib/list_debug.c:30
Code: 89 e0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 58 44 b9 fd 49 8b 14 24 4c 39 f2 75 67 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 <74> 08 4c 89 f7 e8 39 44 b9 fd 49 8b 16 48 39 da 75 5d 4d 39 f7 74
RSP: 0018:ffffc900033c7b70 EFLAGS: 00000246
RAX: 1ffff9200094ff48 RBX: ffffffff8dd5b950 RCX: c95a4a35e7f76800
RDX: ffffc90004a7fa40 RSI: ffffc90004a7fa40 RDI: ffffc900033c7c40
RBP: ffffc900033c7cf0 R08: ffffffff8dd5b907 R09: 1ffffffff1bab720
R10: dffffc0000000000 R11: fffffbfff1bab721 R12: ffffffff8dd5b958
R13: dffffc0000000000 R14: ffffc90004a7fa40 R15: ffffc900033c7c40
__list_add include/linux/list.h:69 [inline]
list_add_tail include/linux/list.h:102 [inline]
__mutex_add_waiter kernel/locking/mutex.c:210 [inline]
__mutex_lock_common kernel/locking/mutex.c:637 [inline]
__mutex_lock+0x2f8/0xae0 kernel/locking/mutex.c:747
dev_ifconf+0x19e/0x300 net/core/dev_ioctl.c:66
sock_ioctl+0x286/0x700 net/socket.c:1317
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: 0033:0x7fbdc0f9de99
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:00007fbdc1ef5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbdc1225fa0 RCX: 00007fbdc0f9de99
RDX: 0000200000000080 RSI: 0000000000008912 RDI: 0000000000000004
RBP: 00007fbdc1033eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbdc1226038 R14: 00007fbdc1225fa0 R15: 00007ffce35cb018
</TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g166017 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=92381
rcu: rcu_preempt kthread starved for 10502 jiffies! g166017 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:I stack:26800 pid:16 ppid:2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0x107f/0x4030 kernel/sched/core.c:6563
schedule+0xb9/0x180 kernel/sched/core.c:6639
schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x303/0x1350 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x99/0x3b0 kernel/rcu/tree.c:1905
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 24122 Comm: syz.2.5905 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:hlock_class kernel/locking/lockdep.c:-1 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4728 [inline]
RIP: 0010:__lock_acquire+0x566/0x7c40 kernel/locking/lockdep.c:5013
Code: 00 00 00 e8 8c 5e 6f 00 48 0f a3 1d 84 ee 4c 0f 73 1f 48 8d 04 5b c1 e0 06 48 8d 98 00 71 49 90 48 ba 00 00 00 00 00 fc ff df <4c> 8b 64 24 10 eb 35 48 c7 c0 40 61 c1 96 48 c1 e8 03 48 ba 00 00
RSP: 0018:ffffc90000007060 EFLAGS: 00000006
RAX: 00000000000021c0 RBX: ffffffff904992c0 RCX: ffffffff816403b4
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffffff90b0f240
RBP: ffffc90000007290 R08: ffffffff90b0f247 R09: 1ffffffff2161e48
R10: dffffc0000000000 R11: fffffbfff2161e49 R12: 0000000000000000
R13: ffff8880242dbc00 R14: 0000000000000000 R15: ffff8880242dc778
FS: 00007fbdc1ef56c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbdc0feb580 CR3: 0000000077b91000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676
rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
rcu_read_lock include/linux/rcupdate.h:791 [inline]
__perf_event_output kernel/events/core.c:7728 [inline]
perf_event_output_forward+0xdf/0x2f0 kernel/events/core.c:7750
__perf_event_overflow+0x457/0x630 kernel/events/core.c:9496
perf_swevent_overflow kernel/events/core.c:9579 [inline]
perf_swevent_event+0x315/0x570 kernel/events/core.c:9630
perf_tp_event+0x36b/0xc10 kernel/events/core.c:10064
perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10032
perf_trace_preemptirq_template+0x268/0x320 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 a2 7c 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:ffffc90000007ae0 EFLAGS: 00000206
RAX: c95a4a35e7f76800 RBX: 1ffff92000000f64 RCX: c95a4a35e7f76800
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adf5de0
RBP: ffffc90000007bd0 R08: ffffffff90b0f2cf R09: 1ffffffff2161e59
R10: dffffc0000000000 R11: fffffbfff2161e5a R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8e3bb00 R15: 0000000000000001
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
__run_hrtimer kernel/time/hrtimer.c:1751 [inline]
__hrtimer_run_queues+0x522/0xc90 kernel/time/hrtimer.c:1815
hrtimer_run_softirq+0x173/0x290 kernel/time/hrtimer.c:1832
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:__list_add_valid+0x5d/0xe0 lib/list_debug.c:30
Code: 89 e0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 58 44 b9 fd 49 8b 14 24 4c 39 f2 75 67 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 <74> 08 4c 89 f7 e8 39 44 b9 fd 49 8b 16 48 39 da 75 5d 4d 39 f7 74
RSP: 0018:ffffc900033c7b70 EFLAGS: 00000246
RAX: 1ffff9200094ff48 RBX: ffffffff8dd5b950 RCX: c95a4a35e7f76800
RDX: ffffc90004a7fa40 RSI: ffffc90004a7fa40 RDI: ffffc900033c7c40
RBP: ffffc900033c7cf0 R08: ffffffff8dd5b907 R09: 1ffffffff1bab720
R10: dffffc0000000000 R11: fffffbfff1bab721 R12: ffffffff8dd5b958
R13: dffffc0000000000 R14: ffffc90004a7fa40 R15: ffffc900033c7c40
__list_add include/linux/list.h:69 [inline]
list_add_tail include/linux/list.h:102 [inline]
__mutex_add_waiter kernel/locking/mutex.c:210 [inline]
__mutex_lock_common kernel/locking/mutex.c:637 [inline]
__mutex_lock+0x2f8/0xae0 kernel/locking/mutex.c:747
dev_ifconf+0x19e/0x300 net/core/dev_ioctl.c:66
sock_ioctl+0x286/0x700 net/socket.c:1317
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: 0033:0x7fbdc0f9de99
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:00007fbdc1ef5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbdc1225fa0 RCX: 00007fbdc0f9de99
RDX: 0000200000000080 RSI: 0000000000008912 RDI: 0000000000000004
RBP: 00007fbdc1033eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbdc1226038 R14: 00007fbdc1225fa0 R15: 00007ffce35cb018
</TASK>
---
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