SYZFAIL: tun: read failed

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syzbot

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Feb 21, 2021, 1:01:21 PM2/21/21
to syzkaller-f...@googlegroups.com
Hello,

syzbot found the following issue on:

HEAD commit: 8b723968 ext2fs: clear write cluster tracking on truncation
git tree: https://github.com/freebsd/freebsd-src.git main
console output: https://syzkaller.appspot.com/x/log.txt?x=163f78bcd00000
dashboard link: https://syzkaller.appspot.com/bug?extid=2e35ed33b9b494e74b01

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2e35ed...@syzkaller.appspotmail.com

SYZFAIL: tun: read failed
(errno 0: No error: 0)
SYZFAIL: child failed
if_delmulti_locked: detaching ifnet instance 0xfffff80019c5a800
if_delmulti_locked: detaching ifnet instance 0xfffff80019c5a800
if_delmulti_locked: detaching ifnet instance 0xfffff80019c5a800
if_delmulti_locked: detaching ifnet instance 0xfffff80019c5a800
if_delmulti_locked: detaching ifnet instance 0xfffff80019c5a800
if_delmulti_locked: detaching ifnet instance 0xfffff80019c5a800
if_delmulti_locked: detaching ifnet instance 0xfffff80019c5a800
if_delmulti_locked: detaching ifnet instance 0xfffff80019ab1000
if_delmulti_locked: detaching ifnet instance 0xfffff80019ab1000
if_delmulti_locked: detaching ifnet instance 0xfffff80019ab1000
Feb 21 18:03:48 ci-freebsd-main-3 dhclient[19348]: Interface tap1 is down, dhclient exiting


FreeBSD/amd64 (ci-freebsd-main-3.c.syzkaller.internal) (ttyu0)

login: if_delmulti_locked: detaching ifnet instance 0xfffff80019ab1800
if_delmulti_locked: detaching ifnet instance 0xfffff80019ab1800
if_delmulti_locked: detaching ifnet instance 0xfffff80019ab1800
Feb 21 18:03:49 ci-freebsd-main-3 dhclient[815]: Interface tap0 is down, dhclient exiting
Feb 21 18:03:49 ci-freebsd-main-3 dhclient[815]: connection closed
Feb 21 18:03:49 ci-freebsd-main-3 dhclient[815]: exiting.
if_delmulti_locked: detaching ifnet instance 0xfffff80019b77800
if_delmulti_locked: detaching ifnet instance 0xfffff80019b77800
if_delmulti_locked: detaching ifnet instance 0xfffff80019b77800
set $lines = 0


---
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syzbot

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Feb 21, 2021, 6:02:17 PM2/21/21
to syzkaller-f...@googlegroups.com
syzbot has found a reproducer for the following issue on:

HEAD commit: 8b723968 ext2fs: clear write cluster tracking on truncation
git tree: https://github.com/freebsd/freebsd-src.git main
console output: https://syzkaller.appspot.com/x/log.txt?x=17d2220cd00000
dashboard link: https://syzkaller.appspot.com/bug?extid=2e35ed33b9b494e74b01
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1353e35ad00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2e35ed...@syzkaller.appspotmail.com

SYZFAIL: tun: read failed
(errno 0: No error: 0)
SYZFAIL: child failed


ifconfig: interface /dev/tap0 does not exist
(errno 9: Bad file descriptor)

Mark Johnston

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May 14, 2021, 10:10:14 AM5/14/21
to syzbot, syzkaller-f...@googlegroups.com
#syz invalid

Should be addressed by
https://github.com/google/syzkaller/commit/80f9b41855d0f32880a09b8966a1961fb53e4ea9
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