Bug 194110 - [lor] if_lagg rmlock <-> re0
Summary: [lor] if_lagg rmlock <-> re0
Status: Closed Feedback Timeout
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: CURRENT
Hardware: Any Any
: --- Affects Only Me
Assignee: freebsd-net (Nobody)
URL:
Keywords: regression
Depends on:
Blocks:
 
Reported: 2014-10-03 08:23 UTC by Jean-Sébastien Pédron
Modified: 2018-08-29 19:32 UTC (History)
1 user (show)

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Description Jean-Sébastien Pédron freebsd_committer freebsd_triage 2014-10-03 08:23:55 UTC 
The following LOR appeared between r272024 and r272450:

Oct  3 10:11:38 magellan kernel: lock order reversal:
Oct  3 10:11:38 magellan kernel: 1st 0xfffff80006c92008 if_lagg rmlock (if_lagg rmlock) @ /mnt/home/dumbbell/Projects/freebsd/src/SVN/head/sys/modules/if_lagg/../../net/if_lagg.c:1448
Oct  3 10:11:38 magellan kernel: 2nd 0xfffffe0000edd218 re0 (network driver) @ /mnt/home/dumbbell/Projects/freebsd/src/SVN/head/sys/dev/re/if_re.c:3416
Oct  3 10:11:38 magellan kernel: KDB: stack backtrace:
Oct  3 10:11:38 magellan kernel: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe012185e110
Oct  3 10:11:38 magellan kernel: kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe012185e1c0
Oct  3 10:11:38 magellan kernel: witness_checkorder() at witness_checkorder+0xdc2/frame 0xfffffe012185e250
Oct  3 10:11:38 magellan kernel: __mtx_lock_flags() at __mtx_lock_flags+0xa8/frame 0xfffffe012185e2a0
Oct  3 10:11:38 magellan kernel: re_ioctl() at re_ioctl+0x114/frame 0xfffffe012185e2e0
Oct  3 10:11:38 magellan kernel: lagg_port_ioctl() at lagg_port_ioctl+0xde/frame 0xfffffe012185e350
Oct  3 10:11:38 magellan kernel: if_addmulti() at if_addmulti+0x253/frame 0xfffffe012185e3d0
Oct  3 10:11:38 magellan kernel: lagg_ether_cmdmulti() at lagg_ether_cmdmulti+0x108/frame 0xfffffe012185e410
Oct  3 10:11:38 magellan kernel: lagg_ioctl() at lagg_ioctl+0x7eb/frame 0xfffffe012185e4f0
Oct  3 10:11:38 magellan kernel: if_addmulti() at if_addmulti+0x253/frame 0xfffffe012185e570
Oct  3 10:11:38 magellan kernel: in6_mc_join_locked() at in6_mc_join_locked+0x1a2/frame 0xfffffe012185e600
Oct  3 10:11:38 magellan kernel: in6_joingroup() at in6_joingroup+0x75/frame 0xfffffe012185e640
Oct  3 10:11:38 magellan kernel: in6_update_ifa() at in6_update_ifa+0xc37/frame 0xfffffe012185e740
Oct  3 10:11:38 magellan kernel: in6_ifattach() at in6_ifattach+0x455/frame 0xfffffe012185e970
Oct  3 10:11:38 magellan kernel: ifioctl() at ifioctl+0xad4/frame 0xfffffe012185ea30
Oct  3 10:11:38 magellan kernel: kern_ioctl() at kern_ioctl+0x22b/frame 0xfffffe012185ea90
Oct  3 10:11:38 magellan kernel: sys_ioctl() at sys_ioctl+0x13c/frame 0xfffffe012185eae0
Oct  3 10:11:38 magellan kernel: amd64_syscall() at amd64_syscall+0x25a/frame 0xfffffe012185ebf0
Oct  3 10:11:38 magellan kernel: Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe012185ebf0
Oct  3 10:11:38 magellan kernel: --- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x8011df81a, rsp = 0x7fffffffe458, rbp = 0x7fffffffe4b0 ---

The lagg0 interface is configured like this in /etc/rc.conf:
ifconfig_lagg0="laggproto failover laggport re0 laggport wlan0 SYNCDHCP"
Comment 1 Kevin Bowling freebsd_committer freebsd_triage 2017-09-01 06:19:25 UTC 
Do you still see this on recent HEAD?  I wonder if https://reviews.freebsd.org/D11711 was related