panic: receive 3

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syzbot

unread,
Feb 23, 2019, 1:40:05 PM2/23/19
to syzkaller-...@googlegroups.com
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=12b64ba2c00000
dashboard link: https://syzkaller.appspot.com/bug?extid=e8aa26ad551c649227b4

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+e8aa26...@syzkaller.appspotmail.com

[ 82.5267784] panic: receive 3
[ 82.5267784] cpu0: Begin traceback...
[ 82.5267784] vpanic() at netbsd:vpanic+0x214
[ 82.5267784] snprintf() at netbsd:snprintf
[ 82.5392947] soreceive() at netbsd:soreceive+0x1d63
[ 82.5392947] do_sys_recvmsg_so() at netbsd:do_sys_recvmsg_so+0x31f
[ 82.5392947] do_sys_recvmsg() at netbsd:do_sys_recvmsg+0xaf
[ 82.5539396] sys_recvmsg() at netbsd:sys_recvmsg+0x123
[ 82.5768377] sys___syscall() at netbsd:sys___syscall+0xe2
[ 82.5893508] syscall() at netbsd:syscall+0x30e
[ 82.5893508] --- syscall (number 198) ---
[ 82.6039012] 7da40183f4aa:
[ 82.6039012] cpu0: End traceback...

[ 82.6039012] dumping to dev 4,1 (offset=0, size=0): not possible
[ 82.6039012] 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


---
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 syzk...@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
syzbot.

syzbot

unread,
Feb 23, 2019, 2:34:05 PM2/23/19
to syzkaller-...@googlegroups.com
syzbot has found a reproducer for 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=1384ada2c00000
dashboard link: https://syzkaller.appspot.com/bug?extid=e8aa26ad551c649227b4
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1781bd82c00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1031b3a2c00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+e8aa26...@syzkaller.appspotmail.com

login: [ 44.2636544] panic: receive 3
[ 44.2636544] cpu0: Begin traceback...
[ 44.2636544] vpanic() at netbsd:vpanic+0x214
[ 44.2636544] snprintf() at netbsd:snprintf
[ 44.2761543] soreceive() at netbsd:soreceive+0x1d63
[ 44.2761543] do_sys_recvmsg_so() at netbsd:do_sys_recvmsg_so+0x31f
[ 44.2886798] do_sys_recvmsg() at netbsd:do_sys_recvmsg+0xaf
[ 44.2886798] sys_recvmsg() at netbsd:sys_recvmsg+0x123
[ 44.3032903] sys_syscall() at netbsd:sys_syscall+0xe2
[ 44.3141474] syscall() at netbsd:syscall+0x30e
[ 44.3274590] --- syscall (number 0) ---
[ 44.3274590] 7f64b023f4ca:
[ 44.3274590] cpu0: End traceback...

[ 44.3421045] dumping to dev 4,1 (offset=0, size=0): not possible
[ 44.3421045] 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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