syzbot

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WARNING: CPU: 1 PID: 8210 at kernel/events/core.c:10356 __perf_event_overflow+0xb3b/0xe40 kernel/events/core.c:10356
Modules linked in:
CPU: 1 UID: 0 PID: 8210 Comm: syz.0.943 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__perf_event_overflow+0xb3b/0xe40 kernel/events/core.c:10356
Code: 08 4c 89 f7 e8 16 ea 33 00 4d 89 3e e9 bc fa ff ff 48 c7 44 24 40 00 00 00 00 e8 80 6b d0 ff e9 1c fe ff ff e8 76 6b d0 ff 90 <0f> 0b 90 e9 2d ff ff ff e8 68 6b d0 ff 48 c7 c7 40 e8 93 8b e8 4c
RSP: 0018:ffffc9000bee7240 EFLAGS: 00010293
RAX: ffffffff81ef421a RBX: 1ffff11006679ddd RCX: ffff888020359e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000bee7350 R08: ffff8880333cec8f R09: 1ffff11006679d91
R10: dffffc0000000000 R11: ffffed1006679d92 R12: dffffc0000000000
R13: ffff8880333cea40 R14: ffff8880333cec88 R15: 0000000000000000
FS:  00007f085d0916c0(0000) GS:ffff888125d12000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000007427c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 perf_swevent_overflow kernel/events/core.c:10454 [inline]
 perf_swevent_event+0x2f4/0x5e0 kernel/events/core.c:-1
 do_perf_sw_event kernel/events/core.c:10594 [inline]
 ___perf_sw_event+0x4a1/0x700 kernel/events/core.c:10621
 __perf_sw_event+0xfa/0x1a0 kernel/events/core.c:10633
 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+0x4a/0x90 arch/x86/lib/copy_user_64.S:74
Code: 0a 04 00 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 73 e8 eb c5 <f3> a4 c3 cc cc cc cc 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48
RSP: 0018:ffffc9000bee7878 EFLAGS: 00050206
RAX: ffffffff84c64501 RBX: ffff88805b5d0000 RCX: 000000000000fe33
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff88805b5d0000
RBP: ffffc9000bee79f0 R08: ffff88805b5dfe32 R09: 1ffff1100b6bbfc6
R10: dffffc0000000000 R11: ffffed100b6bbfc7 R12: 1ffff920017dcf77
R13: 0000000000000000 R14: ffffc9000bee7bc8 R15: 000000000000fe33
 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]
 copy_from_user_iter lib/iov_iter.c:55 [inline]
 iterate_ubuf include/linux/iov_iter.h:30 [inline]
 iterate_and_advance2 include/linux/iov_iter.h:302 [inline]
 iterate_and_advance include/linux/iov_iter.h:330 [inline]
 __copy_from_iter lib/iov_iter.c:249 [inline]
 _copy_from_iter+0x24f/0x1790 lib/iov_iter.c:260
 copy_from_iter include/linux/uio.h:228 [inline]
 copy_from_iter_full include/linux/uio.h:245 [inline]
 memcpy_from_msg include/linux/skbuff.h:4222 [inline]
 netlink_sendmsg+0x6b2/0xb30 net/netlink/af_netlink.c:1881
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:729
 sock_write_iter+0x258/0x330 net/socket.c:1179
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c6/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 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: 0033:0x7f085c18eec9
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:00007f085d091038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f085c3e5fa0 RCX: 00007f085c18eec9
RDX: 000000000000fe33 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f085c211f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f085c3e6038 R14: 00007f085c3e5fa0 R15: 00007ffcde6daf28
 </TASK>
----------------
Code disassembly (best guess):
   0:	0a 04 00             	or     (%rax,%rax,1),%al
   3:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   a:	00 00 00
   d:	0f 1f 00             	nopl   (%rax)
  10:	48 8b 06             	mov    (%rsi),%rax
  13:	48 89 07             	mov    %rax,(%rdi)
  16:	48 83 c6 08          	add    $0x8,%rsi
  1a:	48 83 c7 08          	add    $0x8,%rdi
  1e:	83 e9 08             	sub    $0x8,%ecx
  21:	74 db                	je     0xfffffffe
  23:	83 f9 08             	cmp    $0x8,%ecx
  26:	73 e8                	jae    0x10
  28:	eb c5                	jmp    0xffffffef
* 2a:	f3 a4                	rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction
  2c:	c3                   	ret
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	cc                   	int3
  30:	cc                   	int3
  31:	48 8b 06             	mov    (%rsi),%rax
  34:	48 89 07             	mov    %rax,(%rdi)
  37:	48 8d 47 08          	lea    0x8(%rdi),%rax
  3b:	48 83 e0 f8          	and    $0xfffffffffffffff8,%rax
  3f:	48                   	rex.W