corrupted report

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: af876e934dda Register kUBSan and KCOV in kernel=GENERIC of..
git tree: netbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=14f73bd4c00000
dashboard link: https://syzkaller.appspot.com/bug?extid=12e86eebbb57420b22d0

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+12e86e...@syzkaller.appspotmail.com

[ 32.0706954] fatal page fault in supervisor mode
[ 32.0706954] trap type 6 code 0 rip 0xffffffff80ee1709 cs 0x8 rflags
0x10287 cr2 0xffff900000000000 ilevel 0 rsp 0xffffc4816eaf7c98
[ 32.0706954] curlwp 0xffffc48011fc61c0 pid 767.2 lowest kstack
0xffffc4816eaf02c0
[ 32.0706954] panic: trap
[ 32.0706954] cpu1: Begin traceback...
[ 32.0817608] vpanic() at netbsd:vpanic+0x214
[ 32.0817608] snprintf() at netbsd:snprintf
[ 32.0817608] startlwp() at netbsd:startlwp
[ 32.0928709] alltraps() at netbsd:alltraps+0xb2
[ 32.1039814] shm_delete_mapping() at netbsd:shm_delete_mapping+0x7f
[ 32.1150915] sys_shmat() at netbsd:sys_shmat+0x4b5
[ 32.1262011] sys___syscall() at netbsd:sys___syscall+0xe2
[ 32.1262011] syscall() at netbsd:syscall+0x30e
[ 32.1373117] --- syscall (number 198) ---
[ 32.1373117] 775e9043f4aa:
[ 32.1484219] cpu1: End traceback...

[ 32.1484219] dumping to dev 4,1 (offset=0, size=0): not possible
[ 32.1595325] rebooting...
SeaBIOS (version 1.8.2-20181029_212248-google)
Total RAM Size = 0x00000001e0000000 = 7680 MiB
CPUs found: 2 Max CPUs supported: 2
found virtio-scsi at 0:3
virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0
removable=0
virtio-scsi blksize=512 sectors=4194304 = 2048 MiB
drive 0x000f2a00: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304
Booting from Hard Disk 0...

>> NetBSD/x86 BIOS Boot, Revision 5.10 (Tue Jul 17 14:59:51 UTC 2018) (from
>> NetBSD 8.0)
>> Memory: 639/3144640 k

1. Boot normally
2. Boot single user
3. Disable ACPI
4. Disable ACPI and SMP
5. Drop to boot prompt
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/ - \ | / - \ | / - \ | / - \ | / - \ | / - \ | / - \ | WARNING: couldn't
open /var/db/entropy-file
WARNING: 1 module failed to load


---
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[Dmitry Vyukov]

On Sun, Feb 24, 2019 at 1:01 AM syzbot
<syzbot+12e86e...@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: af876e934dda Register kUBSan and KCOV in kernel=GENERIC of..
> git tree: netbsd
> console output: https://syzkaller.appspot.com/x/log.txt?x=14f73bd4c00000
> dashboard link: https://syzkaller.appspot.com/bug?extid=12e86eebbb57420b22d0
>
> Unfortunately, I don't have any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+12e86e...@syzkaller.appspotmail.com

This does not look "corrupted" (e.g. intermixed lines from different
cpus making not possible to understand what happens). So something to
improve in pkg/report.

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