https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202962
Bug ID: 202962
Summary: [iwn] ampdu tx panic
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: wireless
Assignee: freebsd-wireless@FreeBSD.org
Reporter: henry.hu...@gmail.com
I've got panic twice, but I don't have a coredump. Both times the panics are
related to iwn AMPDU TX code. I've got screenshots for the 2nd time, and I've
attached them.
1st:
https://goo.gl/photos/DfBKcERDHTdnYpda6
2nd:
https://goo.gl/photos/FmuuH7viE2fATpsj8
https://goo.gl/photos/hFqNumEaapkpbHzr5
https://goo.gl/photos/3NHhUrbYH6ugkWM38
system:
FreeBSD pepsi 11.0-CURRENT FreeBSD 11.0-CURRENT #11 r287028M: Sat Aug 22
20:22:32 EDT 2015 root@pepsi:/usr/obj/usr/src/sys/MYKERNEL amd64
For the first time, the crash happened in iwn_tx_data()+0x183, at line
4431 ring = &sc->txq[ac];
4432 if ((seqno % 256) != ring->cur) {
I don't have the register info that time, but I think that it's mostly the same
cause as the 2nd time. Possibly 'ac' is invalid.
The second crash happened in iwn_ampdu_tx_stop()+0x60, at line
7419 if (sc->txq[qid].queued != 0)
Disassemble says:
0000000000004090 <iwn_ampdu_tx_stop>:
...
40e6: 4c 63 38 movslq (%rax),%r15
40e9: 49 69 c7 98 28 00 00 imul $0x2898,%r15,%rax
40f0: 41 83 bc 05 8c 2a 00 cmpl $0x0,0x2a8c(%r13,%rax,1)
40f7: 00 00
and 0x2898 = sizeof(iwn_tx_ring). %r15 should be qid, and %r15 = 0x42535f5c
which is clearly invalid(This happened to be all ASCII chars. Maybe reused?).
It seems like that someone overwrites tap->txa_private, and this caused both
panics. Or it's possible that it's freed and reused.
--
You are receiving this mail because:
You are the assignee for the bug.
_______________________________________________
freebsd-wireless@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/freebsd-wireless
To unsubscribe, send any mail to "freebsd-wireless-unsubscr...@freebsd.org"
