[v6.1] INFO: rcu detected stall in skb_release_data

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6:19 AM (9 hours ago) 6:19 AM
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Hello,

syzbot found the following issue on:

HEAD commit: 228da13e907e Linux 6.1.175
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12611e7a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=4dd3c1715f0a309b
dashboard link: https://syzkaller.appspot.com/bug?extid=dd0b6333e87f704f78c6
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/894d01ce6736/disk-228da13e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2a4cec18e217/vmlinux-228da13e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/32550387ebe8/bzImage-228da13e.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dd0b63...@syzkaller.appspotmail.com

rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2652 jiffies s: 120489 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: 28581 Comm: syz.2.7665 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:check_preemption_disabled+0x6/0x110 lib/smp_processor_id.c:13
Code: 89 f6 e8 5d d2 09 fa e9 6e ff ff ff 00 00 cc cc 00 00 cc cc 48 c7 c7 00 20 df 8a 48 c7 c6 40 20 df 8a eb 00 55 41 57 41 56 53 <48> 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 65 8b 05 71
RSP: 0018:ffffc900001df8f8 EFLAGS: 00000082
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8a8c2c20 RDI: ffffffff8adf2060
RBP: ffffc900001dfa28 R08: dffffc0000000000 R09: 1ffffffff215fe48
R10: dffffc0000000000 R11: fffffbfff215fe49 R12: 0000000000000001
R13: 1ffff9200003bf30 R14: 0000000000000046 R15: dffffc0000000000
FS: 00007f24f35a96c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32023ffc CR3: 000000005be75000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline]
lock_acquire+0x1cb/0x4a0 kernel/locking/lockdep.c:5664
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+0x448/0x610 kernel/events/core.c:9496
perf_swevent_overflow+0x19b/0x230 kernel/events/core.c:9579
perf_swevent_event+0x458/0x570 kernel/events/core.c:-1
perf_tp_event+0x3e7/0xc30 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_disable include/trace/events/preemptirq.h:36 [inline]
trace_hardirqs_off_finish+0x13f/0x180 kernel/trace/trace_preemptirq.c:67
irqentry_enter+0x33/0x50 kernel/entry/common.c:382
sysvec_apic_timer_interrupt+0xa/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:30 [inline]
RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:52 [inline]
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:178 [inline]
RIP: 0010:unwind_next_frame+0x135a/0x20b0 arch/x86/kernel/unwind_orc.c:448
Code: c1 48 c1 f9 02 48 c1 e8 3f 48 01 c8 48 83 e0 fe 4d 8d 74 45 00 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 75 27 49 63 06 4c 01 f0 49 8d 4e 04 48 39 e8 4c 0f 46 e9 49
RSP: 0018:ffffc900001e01b0 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: ffffc900001e0288 RCX: dffffc0000000000
RDX: ffffffff8eaa7a24 RSI: ffffffff8e3715d0 RDI: 0000000000000001
RBP: ffffffff81d37d7c R08: 0000000000000011 R09: 0000000000000001
R10: dffffc0000000000 R11: fffff5200003c05d R12: ffffffff8e371610
R13: ffffffff8e3715d0 R14: ffffffff8e3715f0 R15: ffffffff8e3715d0
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1729 [inline]
slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1755
slab_free mm/slub.c:3687 [inline]
__kmem_cache_free+0xb6/0x1f0 mm/slub.c:3700
skb_free_head net/core/skbuff.c:762 [inline]
skb_release_data+0x5db/0x7c0 net/core/skbuff.c:791
skb_release_all net/core/skbuff.c:856 [inline]
__kfree_skb net/core/skbuff.c:870 [inline]
kfree_skb_reason+0x163/0x370 net/core/skbuff.c:893
__netif_receive_skb_core+0x324a/0x38f0 net/core/dev.c:5593
__netif_receive_skb_list_core+0x24e/0x750 net/core/dev.c:5695
__netif_receive_skb_list net/core/dev.c:5762 [inline]
netif_receive_skb_list_internal+0x93f/0xca0 net/core/dev.c:5853
netif_receive_skb_list+0x51/0x4e0 net/core/dev.c:5905
ieee80211_rx_napi+0x357/0x3d0 net/mac80211/rx.c:5342
ieee80211_rx include/net/mac80211.h:4849 [inline]
ieee80211_handle_queued_frames+0x105/0x1b0 net/mac80211/main.c:317
tasklet_action_common+0x2fe/0x4d0 kernel/softirq.c:827
handle_softirqs+0x2a1/0x930 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:finish_task_switch+0x26a/0x8f0 kernel/sched/core.c:5124
Code: 0f 84 3b 01 00 00 48 85 db 0f 85 5a 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 30 ba df 08 e8 cb 30 2f 00 fb 4c 8b 65 c0 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc90004f0f758 EFLAGS: 00000282
RAX: 4d6e3af6fb579100 RBX: 0000000000000000 RCX: 4d6e3af6fb579100
RDX: dffffc0000000000 RSI: ffffffff8a8c1aa0 RDI: ffffffff8adf2060
RBP: ffffc90004f0f7b0 R08: ffff8880b8f3580b R09: 1ffff110171e6b01
R10: dffffc0000000000 R11: ffffed10171e6b02 R12: ffff88802ee50000
R13: dffffc0000000000 R14: ffff888059a8bc00 R15: ffff8880b8f3b5d0
context_switch kernel/sched/core.c:5248 [inline]
__schedule+0x11d9/0x40e0 kernel/sched/core.c:6562
preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:queue_work_on+0x1a0/0x1f0 kernel/workqueue.c:1553
Code: 4d 85 e4 75 16 e8 80 2a 2e 00 eb 15 e8 79 2a 2e 00 e8 34 05 db 08 4d 85 e4 74 ea e8 6a 2a 2e 00 fb 48 c7 44 24 20 0e 36 e0 45 <48> b8 00 00 00 00 00 fc ff df 49 c7 44 05 00 00 00 00 00 41 c7 44
RSP: 0018:ffffc90004f0fac0 EFLAGS: 00000283
RAX: ffffffff81545136 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc900048e1000 RSI: 000000000001f5db RDI: 000000000001f5dc
RBP: ffffc90004f0fb90 R08: ffff8880b8f3580b R09: 1ffff110171e6b01
R10: dffffc0000000000 R11: ffffed10171e6b02 R12: 0000000000000200
R13: 1ffff920009e1f5c R14: 0000000000000000 R15: f8f8f8f8f8f8f801
bpf_prog_load+0x1115/0x1560 kernel/bpf/syscall.c:2691
__sys_bpf+0x5b8/0x780 kernel/bpf/syscall.c:5031
__do_sys_bpf kernel/bpf/syscall.c:5135 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5133 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5133
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: 0033:0x7f24f279ce59
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:00007f24f35a9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f24f2a15fa0 RCX: 00007f24f279ce59
RDX: 0000000000000094 RSI: 0000200000000440 RDI: 0000000000000005
RBP: 00007f24f2832d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f24f2a16038 R14: 00007f24f2a15fa0 R15: 00007ffe2ce1d128
</TASK>


---
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