syzbot

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10500 ticks this GP) idle=026c/1/0x4000000000000000 softirq=30253/30253 fqs=5193
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1557086          0            0
rcu: 	cputime:    20128      32351           59   ==> 52510(ms)
rcu: 	(t=10503 jiffies g=36193 q=2335 ncpus=2)
CPU: 1 PID: 9787 Comm: syz.0.1410 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:212
Code: 00 0f 0b 0f 1f 80 00 00 00 00 f3 0f 1e fa 53 48 89 fb e8 13 00 00 00 48 8b 3d cc 02 04 0d 48 89 de 5b e9 b3 a3 57 00 cc cc cc <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0d e0 d2 7c 7e 65 8b 15 e1 d2 7c
RSP: 0018:ffffc900001f0550 EFLAGS: 00000292
RAX: 0000000000000001 RBX: ffffc900001f06e0 RCX: ffff88802d3f8000
RDX: dffffc0000000000 RSI: ffffffff8a8390a5 RDI: ffffc900001f0628
RBP: ffffc900001f06b0 R08: ffffc900001f06f0 R09: 0000000000000014
R10: 0000000000000004 R11: 0000000000000100 R12: ffffffff8a8390a5
R13: ffffc900001f0628 R14: ffffffff81758be0 R15: dffffc0000000000
FS:  00007f671521a6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 000000002bdf9000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0x27/0x2990 arch/x86/kernel/unwind_orc.c:469
 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+0x28/0x40 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1f0 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+0xba/0x1f0 mm/slub.c:3843
 skb_kfree_head net/core/skbuff.c:946 [inline]
 skb_free_head net/core/skbuff.c:958 [inline]
 skb_release_data+0x609/0x7f0 net/core/skbuff.c:988
 skb_release_all net/core/skbuff.c:1054 [inline]
 __kfree_skb net/core/skbuff.c:1068 [inline]
 kfree_skb_reason+0x10e/0x170 net/core/skbuff.c:1104
 inet_frag_rbtree_purge net/ipv4/inet_fragment.c:317 [inline]
 inet_frag_destroy+0x179/0x290 net/ipv4/inet_fragment.c:354
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x570/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x27d/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
 </IRQ>
 <TASK>
 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 fa ff da f6 48 89 df e8 a2 d3 db f6 e8 6d ce ff f6 fb bf 01 00 00 00 <e8> c2 e3 ce f6 65 8b 05 93 32 76 75 85 c0 74 02 5b c3 e8 60 17 73
RSP: 0018:ffffc900032e7bd8 EFLAGS: 00000286
RAX: 91e08eab9ae8cd00 RBX: ffff88805d642c00 RCX: 91e08eab9ae8cd00
RDX: dffffc0000000000 RSI: ffffffff8acacb60 RDI: 0000000000000001
RBP: 00000000ffffffff R08: ffffffff911bc607 R09: 1ffffffff22378c0
R10: dffffc0000000000 R11: fffffbfff22378c1 R12: ffff88802820c3b0
R13: dffffc0000000000 R14: ffff88805d642c00 R15: 1ffff11005041876
 _perf_event_enable+0x11f/0x1a0 kernel/events/core.c:3060
 perf_event_for_each_child kernel/events/core.c:5817 [inline]
 perf_event_for_each kernel/events/core.c:5835 [inline]
 _perf_ioctl kernel/events/core.c:6049 [inline]
 perf_ioctl+0x8ff/0x24b0 kernel/events/core.c:6068
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f671439ce59
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:00007f671521a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6714615fa0 RCX: 00007f671439ce59
RDX: 0000000000000009 RSI: 0000000000002400 RDI: 0000000000000003
RBP: 00007f6714432e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6714616038 R14: 00007f6714615fa0 R15: 00007ffc1ac758c8
 </TASK>