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SubjectWARNING in perf_reg_value
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Hello,

syzbot found the following crash on:

HEAD commit: 0011572c Merge branch 'for-5.2-fixes' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12c38d66a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=fa9f7e1b6a8bb586
dashboard link: https://syzkaller.appspot.com/bug?extid=10189b9b0f8c4664badd
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1434b876a00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10e6c876a00000

The bug was bisected to:

commit 878068ea270ea82767ff1d26c91583263c81fba0
Author: Kan Liang <kan.liang@linux.intel.com>
Date: Tue Apr 2 19:44:59 2019 +0000

perf/x86: Support outputting XMM registers

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14556d66a00000
final crash: https://syzkaller.appspot.com/x/report.txt?x=16556d66a00000
console output: https://syzkaller.appspot.com/x/log.txt?x=12556d66a00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+10189b9b0f8c4664badd@syzkaller.appspotmail.com
Fixes: 878068ea270e ("perf/x86: Support outputting XMM registers")

WARNING: CPU: 0 PID: 8516 at arch/x86/kernel/perf_regs.c:71
perf_reg_value+0xdb/0x110 arch/x86/kernel/perf_regs.c:75
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 8516 Comm: syz-executor483 Not tainted 5.2.0-rc4+ #32
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
panic+0x2cb/0x744 kernel/panic.c:219
__warn.cold+0x20/0x4d kernel/panic.c:576
report_bug+0x263/0x2b0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:179 [inline]
fixup_bug arch/x86/kernel/traps.c:174 [inline]
do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:986
RIP: 0010:perf_reg_value+0xdb/0x110 arch/x86/kernel/perf_regs.c:71
Code: a0 00 00 00 77 26 48 b8 00 00 00 00 00 fc ff df 48 01 fb 48 89 da 48
c1 ea 03 80 3c 02 00 75 34 48 8b 03 48 83 c4 08 5b 5d c3 <0f> 0b 48 83 c4
08 31 c0 5b 5d c3 89 75 f0 e8 72 d6 78 00 8b 75 f0
RSP: 0018:ffff88809674f2b8 EFLAGS: 00010202
RAX: 00000000fffffff9 RBX: ffff88809674fa68 RCX: ffffffff81855a4e
RDX: 0000000000000000 RSI: 0000000000000019 RDI: ffff88809674fa68
RBP: ffff88809674f2c8 R08: ffff888092eda5c0 R09: ffffed1012f92ebb
R10: ffffed1012f92eba R11: ffff888097c975d7 R12: ffff88809674f320
R13: ffff88809674f508 R14: ffff88809674fa68 R15: ffff88809674f700
perf_output_sample_regs+0xca/0x160 kernel/events/core.c:5914
perf_output_sample+0x15c2/0x1a90 kernel/events/core.c:6351
__perf_event_output kernel/events/core.c:6571 [inline]
perf_event_output_forward+0x150/0x290 kernel/events/core.c:6585
__perf_event_overflow+0x141/0x370 kernel/events/core.c:8052
perf_swevent_overflow+0xaa/0x140 kernel/events/core.c:8128
perf_swevent_event+0x1f7/0x2f0 kernel/events/core.c:8161
do_perf_sw_event kernel/events/core.c:8269 [inline]
___perf_sw_event+0x31c/0x570 kernel/events/core.c:8300
__perf_sw_event+0x51/0xa0 kernel/events/core.c:8312
perf_sw_event include/linux/perf_event.h:1083 [inline]
do_user_addr_fault arch/x86/mm/fault.c:1498 [inline]
__do_page_fault+0x747/0xda0 arch/x86/mm/fault.c:1523
do_page_fault+0x71/0x57d arch/x86/mm/fault.c:1554
page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1156
RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20
arch/x86/lib/copy_user_64.S:205
Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 1f 00 c3 0f 1f
80 00 00 00 00 0f 1f 00 83 fa 40 0f 82 70 ff ff ff 89 d1 <f3> a4 31 c0 0f
1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 89 d1 f3 a4
RSP: 0018:ffff88809674fb10 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 0000000000001000 RCX: 00000000000001c0
RDX: 0000000000001000 RSI: 0000000020001000 RDI: ffff888099b30e40
RBP: ffff88809674fb48 R08: ffffed1013366200 R09: 0000000000000000
R10: ffffed10133661ff R11: ffff888099b30fff R12: 00000000200001c0
R13: ffff888099b30000 R14: 00000000200011c0 R15: 00007ffffffff000
copy_page_from_iter_iovec lib/iov_iter.c:295 [inline]
copy_page_from_iter+0x3ad/0x7d0 lib/iov_iter.c:921
pipe_write+0x281/0xf30 fs/pipe.c:454
call_write_iter include/linux/fs.h:1872 [inline]
new_sync_write+0x4d3/0x770 fs/read_write.c:483
__vfs_write+0xe1/0x110 fs/read_write.c:496
vfs_write+0x20c/0x580 fs/read_write.c:558
ksys_write+0x14f/0x290 fs/read_write.c:611
__do_sys_write fs/read_write.c:623 [inline]
__se_sys_write fs/read_write.c:620 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:620
do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440529
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffe36867c38 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440529
RDX: 000000010000026f RSI: 00000000200001c0 RDI: 0000000000000007
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401db0
R13: 0000000000401e40 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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