syzbot

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WARNING: CPU: 0 PID: 7512 at kernel/events/core.c:10329 __perf_event_overflow+0xaf9/0xe10 kernel/events/core.c:10329
Modules linked in:
CPU: 0 UID: 0 PID: 7512 Comm: syz.0.652 Not tainted 6.16.0-syzkaller-g1b30d4441727 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__perf_event_overflow+0xaf9/0xe10 kernel/events/core.c:10329
Code: 89 3e 4c 8b 3c 24 e9 c3 fc ff ff e8 01 7a d0 ff 49 bd 00 00 00 00 00 fc ff df 4c 8b 74 24 28 e9 06 fe ff ff e8 e8 79 d0 ff 90 <0f> 0b 90 e9 1b ff ff ff e8 da 79 d0 ff 48 c7 c7 80 e3 93 8b e8 1e
RSP: 0018:ffffc900054a74c0 EFLAGS: 00010293
RAX: ffffffff81ef2508 RBX: ffff88807b450c80 RCX: ffff888026b09e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900054a75d0 R08: ffff88807b450ecf R09: 1ffff1100f68a1d9
R10: dffffc0000000000 R11: ffffed100f68a1da R12: ffffc900054a7a68
R13: dffffc0000000000 R14: ffff88807b450ec8 R15: 0000000000000000
FS:  00007f465f1426c0(0000) GS:ffff888125c2a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000269a6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 perf_swevent_overflow kernel/events/core.c:10427 [inline]
 perf_swevent_event+0x2f4/0x5e0 kernel/events/core.c:-1
 do_perf_sw_event kernel/events/core.c:10567 [inline]
 ___perf_sw_event+0x4a1/0x700 kernel/events/core.c:10594
 __perf_sw_event+0xfa/0x1a0 kernel/events/core.c:10606
 perf_sw_event include/linux/perf_event.h:1596 [inline]
 do_user_addr_fault+0x12e4/0x1390 arch/x86/mm/fault.c:1283
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:rep_movs_alternative+0x30/0x90 arch/x86/lib/copy_user_64.S:60
Code: 83 f9 08 73 25 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 <48> 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08
RSP: 0018:ffffc900054a7b18 EFLAGS: 00050206
RAX: 00007ffffffff001 RBX: 0000000000000038 RCX: 0000000000000038
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffffc900054a7b80
RBP: ffffc900054a7d90 R08: ffffc900054a7bb7 R09: 1ffff92000a94f76
R10: dffffc0000000000 R11: fffff52000a94f77 R12: ffffc900054a7de0
R13: 1ffff92000a94f6c R14: ffffc900054a7b80 R15: 0000000000000000
 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline]
 raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline]
 _inline_copy_from_user include/linux/uaccess.h:178 [inline]
 _copy_from_user+0x7a/0xb0 lib/usercopy.c:18
 copy_from_user include/linux/uaccess.h:212 [inline]
 copy_msghdr_from_user net/socket.c:2544 [inline]
 sendmsg_copy_msghdr net/socket.c:2645 [inline]
 ___sys_sendmsg+0x158/0x2a0 net/socket.c:2664
 __sys_sendmsg net/socket.c:2700 [inline]
 __do_sys_sendmsg net/socket.c:2705 [inline]
 __se_sys_sendmsg net/socket.c:2703 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f465e38eb69
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f465f142038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f465e5b5fa0 RCX: 00007f465e38eb69
RDX: 00000000000003e8 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f465e411df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f465e5b5fa0 R15: 00007ffcec624c58
 </TASK>
----------------
Code disassembly (best guess):
   0:	83 f9 08             	cmp    $0x8,%ecx
   3:	73 25                	jae    0x2a
   5:	85 c9                	test   %ecx,%ecx
   7:	74 0f                	je     0x18
   9:	8a 06                	mov    (%rsi),%al
   b:	88 07                	mov    %al,(%rdi)
   d:	48 ff c7             	inc    %rdi
  10:	48 ff c6             	inc    %rsi
  13:	48 ff c9             	dec    %rcx
  16:	75 f1                	jne    0x9
  18:	c3                   	ret
  19:	cc                   	int3
  1a:	cc                   	int3
  1b:	cc                   	int3
  1c:	cc                   	int3
  1d:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  24:	00 00 00
  27:	0f 1f 00             	nopl   (%rax)
* 2a:	48 8b 06             	mov    (%rsi),%rax <-- trapping instruction
  2d:	48 89 07             	mov    %rax,(%rdi)
  30:	48 83 c6 08          	add    $0x8,%rsi
  34:	48 83 c7 08          	add    $0x8,%rdi
  38:	83 e9 08             	sub    $0x8,%ecx
  3b:	74 db                	je     0x18
  3d:	83 f9 08             	cmp    $0x8,%ecx