WARNING in kvm_arch_vcpu_ioctl_run (3)

WARNING in kvm_arch_vcpu_ioctl_run (3)

[syzbot]

Hello,

syzbot hit the following crash on upstream commit
99fec39e7725d091c94d1bb0242e40c8092994f6 (Fri Mar 23 22:34:18 2018 +0000)
Merge tag 'trace-v4.16-rc4' of  
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
syzbot dashboard link:  
https://syzkaller.appspot.com/bug?extid=760a73552f47a8cd0fd9

Unfortunately, I don't have any reproducer for this crash yet.
Raw console output:  
https://syzkaller.appspot.com/x/log.txt?id=6275011434250240
Kernel config:  
https://syzkaller.appspot.com/x/.config?id=-5034017172441945317
compiler: gcc (GCC) 7.1.1 20170620
user-space arch: i386

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+760a73552f47a8cd0fd9@syzkaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for  
details.
If you forward the report, please keep this part and the footer.

WARNING: CPU: 1 PID: 9515 at arch/x86/kvm/x86.c:7544  
kvm_arch_vcpu_ioctl_run+0x1c7/0x5c80 arch/x86/kvm/x86.c:7544
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 9515 Comm: syz-executor4 Not tainted 4.16.0-rc6+ #274
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:17 [inline]
  dump_stack+0x194/0x24d lib/dump_stack.c:53
  panic+0x1e4/0x41c kernel/panic.c:183
  __warn+0x1dc/0x200 kernel/panic.c:547
  report_bug+0x1f4/0x2b0 lib/bug.c:186
  fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
  fixup_bug arch/x86/kernel/traps.c:247 [inline]
  do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
  invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:986
RIP: 0010:kvm_arch_vcpu_ioctl_run+0x1c7/0x5c80 arch/x86/kvm/x86.c:7544
RSP: 0018:ffff8801a2d17580 EFLAGS: 00010212
RAX: 0000000000010000 RBX: ffff8801cdfd8000 RCX: ffffffff810dfea7
RDX: 0000000000000062 RSI: ffffc90003c1b000 RDI: ffff8801ac1a8498
RBP: ffff8801a2d17910 R08: 1ffff10035835b2d R09: 0000000000000001
R10: ffff8801a2d17560 R11: 0000000000000005 R12: 0000000000000000
R13: ffff8801ab083100 R14: ffff8801ac1a8280 R15: ffff8801ac1a8280
  kvm_vcpu_ioctl+0x6f1/0xff0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2560
  kvm_vcpu_compat_ioctl+0x364/0x450  
arch/x86/kvm/../../../virt/kvm/kvm_main.c:2755
  C_SYSC_ioctl fs/compat_ioctl.c:1461 [inline]
  compat_SyS_ioctl+0x151/0x2a30 fs/compat_ioctl.c:1407
  do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline]
  do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392
  entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f41c99
RSP: 002b:00000000f773d09c EFLAGS: 00000286 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000019 RCX: 000000000000ae80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzkaller@googlegroups.com.

syzbot will keep track of this bug report.
If you forgot to add the Reported-by tag, once the fix for this bug is  
merged
into any tree, please reply to this email with:
#syz fix: exact-commit-title
To mark this as a duplicate of another syzbot report, please reply with:
#syz dup: exact-subject-of-another-report
If it's a one-off invalid bug report, please reply with:
#syz invalid
Note: if the crash happens again, it will cause creation of a new bug  
report.
Note: all commands must start from beginning of the line in the email body.

Re: WARNING in kvm_arch_vcpu_ioctl_run (3)

[Wanpeng Li]

2018-03-28 15:13 GMT+08:00 syzbot
<syzbot+760a73552f47a8cd0fd9@syzkaller.appspotmail.com>:
> Hello,
>
> syzbot hit the following crash on upstream commit
> 99fec39e7725d091c94d1bb0242e40c8092994f6 (Fri Mar 23 22:34:18 2018 +0000)
> Merge tag 'trace-v4.16-rc4' of
> git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
> syzbot dashboard link:
> https://syzkaller.appspot.com/bug?extid=760a73552f47a8cd0fd9
>
> Unfortunately, I don't have any reproducer for this crash yet.
> Raw console output:
> https://syzkaller.appspot.com/x/log.txt?id=6275011434250240
> Kernel config:
> https://syzkaller.appspot.com/x/.config?id=-5034017172441945317
> compiler: gcc (GCC) 7.1.1 20170620
> user-space arch: i386
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+760a73552f47a8cd0fd9@syzkaller.appspotmail.com
> It will help syzbot understand when the bug is fixed. See footer for
> details.
> If you forward the report, please keep this part and the footer.
>
> WARNING: CPU: 1 PID: 9515 at arch/x86/kvm/x86.c:7544

Maybe the same as this one. https://lkml.org/lkml/2018/3/21/174 Paolo,
any idea against my analysis?

Regards,
Wanpeng Li

> kvm_arch_vcpu_ioctl_run+0x1c7/0x5c80 arch/x86/kvm/x86.c:7544
> Kernel panic - not syncing: panic_on_warn set ...
>
> CPU: 1 PID: 9515 Comm: syz-executor4 Not tainted 4.16.0-rc6+ #274
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
>  __dump_stack lib/dump_stack.c:17 [inline]
>  dump_stack+0x194/0x24d lib/dump_stack.c:53
>  panic+0x1e4/0x41c kernel/panic.c:183
>  __warn+0x1dc/0x200 kernel/panic.c:547
>  report_bug+0x1f4/0x2b0 lib/bug.c:186
>  fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
>  fixup_bug arch/x86/kernel/traps.c:247 [inline]
>  do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
>  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
>  invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:986
> RIP: 0010:kvm_arch_vcpu_ioctl_run+0x1c7/0x5c80 arch/x86/kvm/x86.c:7544
> RSP: 0018:ffff8801a2d17580 EFLAGS: 00010212
> RAX: 0000000000010000 RBX: ffff8801cdfd8000 RCX: ffffffff810dfea7
> RDX: 0000000000000062 RSI: ffffc90003c1b000 RDI: ffff8801ac1a8498
> RBP: ffff8801a2d17910 R08: 1ffff10035835b2d R09: 0000000000000001
> R10: ffff8801a2d17560 R11: 0000000000000005 R12: 0000000000000000
> R13: ffff8801ab083100 R14: ffff8801ac1a8280 R15: ffff8801ac1a8280
>  kvm_vcpu_ioctl+0x6f1/0xff0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2560
>  kvm_vcpu_compat_ioctl+0x364/0x450
> arch/x86/kvm/../../../virt/kvm/kvm_main.c:2755
>  C_SYSC_ioctl fs/compat_ioctl.c:1461 [inline]
>  compat_SyS_ioctl+0x151/0x2a30 fs/compat_ioctl.c:1407
>  do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline]
>  do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392
>  entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
> RIP: 0023:0xf7f41c99
> RSP: 002b:00000000f773d09c EFLAGS: 00000286 ORIG_RAX: 0000000000000036
> RAX: ffffffffffffffda RBX: 0000000000000019 RCX: 000000000000ae80
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> Dumping ftrace buffer:
>    (ftrace buffer empty)
> Kernel Offset: disabled
> Rebooting in 86400 seconds..
>
>
> ---
> This bug is generated by a dumb bot. It may contain errors.
> See https://goo.gl/tpsmEJ for details.
> Direct all questions to syzkaller@googlegroups.com.
>
> syzbot will keep track of this bug report.
> If you forgot to add the Reported-by tag, once the fix for this bug is
> merged
> into any tree, please reply to this email with:
> #syz fix: exact-commit-title
> To mark this as a duplicate of another syzbot report, please reply with:
> #syz dup: exact-subject-of-another-report
> If it's a one-off invalid bug report, please reply with:
> #syz invalid
> Note: if the crash happens again, it will cause creation of a new bug
> report.
> Note: all commands must start from beginning of the line in the email body.

Re: WARNING in kvm_arch_vcpu_ioctl_run (3)

[syzbot]

syzbot has found a reproducer for the following crash on:

HEAD commit:    1d2ba7fee28b Merge tag 'fbdev-v4.19-rc7' of https://github..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15b019b9400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c0af03fe452b65fb
dashboard link: https://syzkaller.appspot.com/bug?extid=760a73552f47a8cd0fd9
compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=156ad231400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+760a73552f47a8cd0fd9@syzkaller.appspotmail.com

kvm: emulating exchange as write
WARNING: CPU: 1 PID: 10797 at arch/x86/kvm/x86.c:7925  
kvm_arch_vcpu_ioctl_run+0x1ca/0x16e0 arch/x86/kvm/x86.c:7925
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 10797 Comm: syz-executor4 Not tainted 4.19.0-rc6+ #264
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+0x1c4/0x2b4 lib/dump_stack.c:113
  panic+0x238/0x4e7 kernel/panic.c:184
  __warn.cold.8+0x163/0x1ba kernel/panic.c:536
  report_bug+0x254/0x2d0 lib/bug.c:186
  fixup_bug arch/x86/kernel/traps.c:178 [inline]
  do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
  invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:993
RIP: 0010:kvm_arch_vcpu_ioctl_run+0x1ca/0x16e0 arch/x86/kvm/x86.c:7925
Code: 03 80 3c 02 00 0f 85 f0 13 00 00 4c 8b a3 18 2c 00 00 31 ff 4c 89 e6  
e8 74 96 6e 00 4d 85 e4 0f 84 fd 0a 00 00 e8 36 95 6e 00 <0f> 0b e8 2f 95  
6e 00 49 8d 7d 01 48 b8 00 00 00 00 00 fc ff df 48
RSP: 0018:ffff8801d7fff860 EFLAGS: 00010293
RAX: ffff8801c92de280 RBX: ffff8801c8fe0540 RCX: ffffffff81102b80
RDX: 0000000000000000 RSI: ffffffff8110204a RDI: 0000000000000005
RBP: ffff8801d7fff8d8 R08: ffff8801c92de280 R09: 1ffffffff1273955
R10: ffffed003b5e4732 R11: ffff8801daf23993 R12: 0000000000000001
R13: ffff8801c29a7000 R14: 0000000000000000 R15: ffff8801c8fe0618
  kvm_vcpu_ioctl+0x72b/0x1150 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2590
  vfs_ioctl fs/ioctl.c:46 [inline]
  file_ioctl fs/ioctl.c:501 [inline]
  do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685
  ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702
  __do_sys_ioctl fs/ioctl.c:709 [inline]
  __se_sys_ioctl fs/ioctl.c:707 [inline]
  __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707
  do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457579
Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f51c3ee0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457579
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f51c3ee16d4
R13: 00000000004c003b R14: 00000000004d0108 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..

Re: WARNING in kvm_arch_vcpu_ioctl_run (3)

[syzbot]

syzbot has bisected this bug to:

commit 706249c222f68471b6f8e9e8e9b77665c404b226
Author: Peter Zijlstra <peterz@infradead.org>
Date:   Fri Jul 24 13:06:37 2015 +0000

     locking/static_keys: Rework update logic

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=175cc587200000
start commit:   1d2ba7fe Merge tag 'fbdev-v4.19-rc7' of https://github.com..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=14dcc587200000
console output: https://syzkaller.appspot.com/x/log.txt?x=10dcc587200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c0af03fe452b65fb
dashboard link: https://syzkaller.appspot.com/bug?extid=760a73552f47a8cd0fd9
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=156ad231400000

Reported-by: syzbot+760a73552f47a8cd0fd9@syzkaller.appspotmail.com
Fixes: 706249c222f6 ("locking/static_keys: Rework update logic")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Re: WARNING in kvm_arch_vcpu_ioctl_run (3)

[syzbot]

syzbot has found a reproducer for the following crash on:

HEAD commit:    963172d9 Merge branch 'x86-urgent-for-linus' of git://git...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11422276a00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fa9f7e1b6a8bb586
dashboard link: https://syzkaller.appspot.com/bug?extid=760a73552f47a8cd0fd9
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=103d3e21a00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1645f956a00000

The bug was bisected to:

commit 706249c222f68471b6f8e9e8e9b77665c404b226
Author: Peter Zijlstra <peterz@infradead.org>
Date:   Fri Jul 24 13:06:37 2015 +0000

     locking/static_keys: Rework update logic

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=175cc587200000
final crash:    https://syzkaller.appspot.com/x/report.txt?x=14dcc587200000
console output: https://syzkaller.appspot.com/x/log.txt?x=10dcc587200000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+760a73552f47a8cd0fd9@syzkaller.appspotmail.com
Fixes: 706249c222f6 ("locking/static_keys: Rework update logic")

WARNING: CPU: 1 PID: 9153 at arch/x86/kvm/x86.c:8302  
kvm_arch_vcpu_ioctl_run+0x1d8/0x1740 arch/x86/kvm/x86.c:8302
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 9153 Comm: syz-executor142 Not tainted 5.2.0-rc4+ #53
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:kvm_arch_vcpu_ioctl_run+0x1d8/0x1740 arch/x86/kvm/x86.c:8302
Code: 80 3c 02 00 0f 85 09 14 00 00 49 8b 9c 24 18 0d 00 00 31 ff 48 89 de  
e8 56 93 62 00 48 85 db 0f 84 77 0c 00 00 e8 a8 91 62 00 <0f> 0b e8 a1 91  
62 00 49 8d 7e 01 48 b8 00 00 00 00 00 fc ff df 48
RSP: 0018:ffff8880a0a6fb30 EFLAGS: 00010293
RAX: ffff8880863945c0 RBX: 0000000000000001 RCX: ffffffff810e3c69
RDX: 0000000000000000 RSI: ffffffff810e2fb8 RDI: 0000000000000005
RBP: ffff8880a0a6fb98 R08: ffff8880863945c0 R09: ffffed1015d26be0
R10: ffffed1015d26bdf R11: ffff8880ae935efb R12: ffff8880a4048040
R13: 0000000000000000 R14: ffff8880937c8000 R15: ffff8880a38d2680
  kvm_vcpu_ioctl+0x4dc/0xf90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2755
  vfs_ioctl fs/ioctl.c:46 [inline]
  file_ioctl fs/ioctl.c:509 [inline]
  do_vfs_ioctl+0xd5f/0x1380 fs/ioctl.c:696
  ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
  __do_sys_ioctl fs/ioctl.c:720 [inline]
  __se_sys_ioctl fs/ioctl.c:718 [inline]
  __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
  do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x448cb9
Code: e8 8c b0 02 00 48 83 c4 18 c3 0f 1f 80 00 00 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 0f 83 4b 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ff6ad8dcce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006ddc58 RCX: 0000000000448cb9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00000000006ddc50 R08: 00007ff6ad8dd700 R09: 0000000000000000
R10: 00007ff6ad8dd700 R11: 0000000000000246 R12: 00000000006ddc5c
R13: 00007ffdd645a21f R14: 00007ff6ad8dd9c0 R15: 20c49ba5e353f7cf
Kernel Offset: disabled
Rebooting in 86400 seconds..