------------[ cut here ]------------
!atomic_long_inc_not_zero(&event->refcount)
WARNING: kernel/events/core.c:10739 at __perf_event_overflow+0xb9e/0xec0 kernel/events/core.c:10739, CPU#0: syz.4.2604/19208
Modules linked in:
CPU: 0 UID: 0 PID: 19208 Comm: syz.4.2604 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:__perf_event_overflow+0xb9e/0xec0 kernel/events/core.c:10739
Code: 08 37 00 4d 89 3e 4c 8b 7c 24 10 e9 c2 fc ff ff e8 27 c1 cc ff 49 bd 00 00 00 00 00 fc ff df e9 08 fe ff ff e8 13 c1 cc ff 90 <0f> 0b 90 e9 21 ff ff ff e8 05 c1 cc ff 48 c7 c7 40 1e d7 8b e8 e9
RSP: 0018:ffffc9000c84f4c0 EFLAGS: 00010283
RAX: ffffffff81f8cabd RBX: ffff888022757210 RCX: 0000000000080000
RDX: ffffc900125b2000 RSI: 0000000000005f84 RDI: 0000000000005f85
RBP: ffffc9000c84f5d0 R08: ffff888022757367 R09: 1ffff110044eae6c
R10: dffffc0000000000 R11: ffffed10044eae6d R12: ffff888022757110
R13: dffffc0000000000 R14: ffff888022757360 R15: 0000000000000000
FS:  00007fa08d2bf6c0(0000) GS:ffff888125463000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000085012000 CR4: 00000000003526f0
DR0: 0000000000000008 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 perf_swevent_overflow kernel/events/core.c:10837 [inline]
 perf_swevent_event+0x323/0x650 kernel/events/core.c:-1
 do_perf_sw_event kernel/events/core.c:10977 [inline]
 ___perf_sw_event+0x4a6/0x730 kernel/events/core.c:11004
 __perf_sw_event+0xf9/0x1a0 kernel/events/core.c:11016
 perf_sw_event include/linux/perf_event.h:1604 [inline]
 do_user_addr_fault+0x12a8/0x1340 arch/x86/mm/fault.c:1281
 handle_page_fault arch/x86/mm/fault.c:1474 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:41 [inline]
RIP: 0010:strncpy_from_user+0xb7/0x2b0 lib/strncpy_from_user.c:130
Code: 00 00 4c 89 f6 e8 79 6d db fc 49 83 fe 07 0f 86 9d 00 00 00 48 89 1c 24 4c 89 74 24 08 48 c7 c5 f8 ff ff ff 45 31 ff 4c 89 e3 <4f> 8b 34 3c 48 b8 ff fe fe fe fe fe fe fe 4d 8d 24 06 4d 89 f5 49
RSP: 0018:ffffc9000c84fad8 EFLAGS: 00050246
RAX: ffffffff84ea2337 RBX: 0000000000000000 RCX: ffff88802c00bc80
RDX: 0000000000000002 RSI: 000000000000007f RDI: 0000000000000007
RBP: fffffffffffffff8 R08: ffffc9000c84fc8e R09: 1ffff92001909f91
R10: dffffc0000000000 R11: fffff52001909f92 R12: 0000000000000000
R13: dffffc0000000000 R14: 000000000000007f R15: 0000000000000000
 bpf_prog_load+0xcd9/0x1ae0 kernel/bpf/syscall.c:3024
 __sys_bpf+0x618/0x950 kernel/bpf/syscall.c:6228
 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6339 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa08c39c799
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:00007fa08d2bf028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fa08c615fa0 RCX: 00007fa08c39c799
RDX: 0000000000000094 RSI: 0000200000000480 RDI: 0000000000000005
RBP: 00007fa08c432bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa08c616038 R14: 00007fa08c615fa0 R15: 00007ffcb05ed7d8
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	4c 89 f6             	mov    %r14,%rsi
   5:	e8 79 6d db fc       	call   0xfcdb6d83
   a:	49 83 fe 07          	cmp    $0x7,%r14
   e:	0f 86 9d 00 00 00    	jbe    0xb1
  14:	48 89 1c 24          	mov    %rbx,(%rsp)
  18:	4c 89 74 24 08       	mov    %r14,0x8(%rsp)
  1d:	48 c7 c5 f8 ff ff ff 	mov    $0xfffffffffffffff8,%rbp
  24:	45 31 ff             	xor    %r15d,%r15d
  27:	4c 89 e3             	mov    %r12,%rbx
* 2a:	4f 8b 34 3c          	mov    (%r12,%r15,1),%r14 <-- trapping instruction
  2e:	48 b8 ff fe fe fe fe 	movabs $0xfefefefefefefeff,%rax
  35:	fe fe fe
  38:	4d 8d 24 06          	lea    (%r14,%rax,1),%r12
  3c:	4d 89 f5             	mov    %r14,%r13
  3f:	49                   	rex.WB