rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-....: (9235 ticks this GP) idle=d63c/1/0x4000000000000000 softirq=150764/150764 fqs=4005
rcu: hardirqs softirqs csw/system
rcu: number: 1284395 0 0
rcu: cputime: 16311 36178 45 ==> 52490(ms)
rcu: (t=10500 jiffies g=213613 q=2532 ncpus=2)
CPU: 0 PID: 2931 Comm: syz.1.8954 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:-1 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:393 [inline]
RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:403 [inline]
RIP: 0010:unwind_next_frame+0xe87/0x2970 arch/x86/kernel/unwind_orc.c:585
Code: 02 0f 85 8c 02 00 00 48 89 9c 24 80 00 00 00 49 8d 5c 24 08 49 89 dc 49 c1 ec 03 43 80 3c 2c 00 74 08 48 89 df e8 69 12 a4 00 <48> 89 5c 24 70 4c 89 7c 24 38 48 89 6c 24 10 48 8b 04 24 48 8b 58
RSP: 0018:ffffc90000006778 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffffc90000006850 RCX: 0000000000000003
RDX: ffffffff813b4606 RSI: ffffffff8cfa07f0 RDI: 0000000000000002
RBP: ffffc90000006898 R08: ffff888018fa8000 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: 1ffff92000000d0a
R13: dffffc0000000000 R14: 0000000000000002 R15: ffffffff8f0e79bc
FS: 00007faf93c986c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb8cd43cfb3 CR3: 00000000676e5000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1811 [inline]
slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
kmem_cache_free+0xf8/0x270 mm/slub.c:3852
dev_kfree_skb_any_reason+0x120/0x130 net/core/dev.c:3241
free_old_xmit_skbs+0x11a/0x3d0 drivers/net/virtio_net.c:780
start_xmit+0x168/0x14a0 drivers/net/virtio_net.c:2420
__netdev_start_xmit include/linux/netdevice.h:4943 [inline]
netdev_start_xmit include/linux/netdevice.h:4957 [inline]
xmit_one net/core/dev.c:3632 [inline]
dev_hard_start_xmit+0x246/0x740 net/core/dev.c:3648
sch_direct_xmit+0x25e/0x4c0 net/sched/sch_generic.c:345
__dev_xmit_skb net/core/dev.c:3869 [inline]
__dev_queue_xmit+0x165d/0x3660 net/core/dev.c:4404
NF_HOOK+0x331/0x3b0 include/linux/netfilter.h:-1
arp_xmit+0x16c/0x270 net/ipv4/arp.c:664
arp_process+0x13ba/0x17b0 net/ipv4/arp.c:854
NF_HOOK+0x331/0x3b0 include/linux/netfilter.h:-1
__netif_receive_skb_list_ptype net/core/dev.c:5682 [inline]
__netif_receive_skb_list_core+0x6ea/0x750 net/core/dev.c:5725
__netif_receive_skb_list net/core/dev.c:5777 [inline]
netif_receive_skb_list_internal+0x943/0xca0 net/core/dev.c:5868
gro_normal_list include/net/gro.h:451 [inline]
gro_normal_one include/net/gro.h:464 [inline]
napi_skb_finish net/core/gro.c:575 [inline]
napi_gro_receive+0x565/0xb00 net/core/gro.c:605
receive_buf+0x2203/0x3820 drivers/net/virtio_net.c:1870
virtnet_receive drivers/net/virtio_net.c:2155 [inline]
virtnet_poll+0x5dd/0x1280 drivers/net/virtio_net.c:2229
__napi_poll+0xc0/0x460 net/core/dev.c:6638
napi_poll net/core/dev.c:6705 [inline]
net_rx_action+0x616/0xc40 net/core/dev.c:6841
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 00 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 3a dd d8 f6 48 89 df e8 f2 b1 d9 f6 e8 6d c4 fd f6 fb bf 01 00 00 00 d2 b8 cc f6 65 8b 05 43 e6 73 75 85 c0 74 02 5b c3 e8 c0 cd 70
RSP: 0018:ffffc90003a87c78 EFLAGS: 00000286
RAX: eb1a76f8b219a600 RBX: ffff88802d701280 RCX: eb1a76f8b219a600
RDX: dffffc0000000000 RSI: ffffffff8acac9e0 RDI: 0000000000000001
RBP: ffff88802d701280 R08: ffffffff8e8b0c2f R09: 1ffffffff1d16185
R10: dffffc0000000000 R11: fffffbfff1d16186 R12: ffffc90003a87e00
R13: 0000000000000009 R14: dffffc0000000000 R15: ffff888018fa8920
spin_unlock_irq include/linux/spinlock.h:401 [inline]
get_signal+0x1068/0x13f0 kernel/signal.c:2867
arch_do_signal_or_restart+0xc2/0x800 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7faf92d9c819
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:00007faf93c98028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: 0000000000000005 RBX: 00007faf93015fa0 RCX: 00007faf92d9c819
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000480
RBP: 00007faf92e32c91 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007faf93016038 R14: 00007faf93015fa0 R15: 00007ffcb667f208