I'm (also) trying to debug an issue with an ath5k system that deadlocks.
We have sysrq output for the held locks, process backtraces, etc.
One thing that has me confused is that the locks-held output shows
a large number of processes owning the rtnl_mutex. Any idea
how to tell what process *really* owns it?
Oct 4 14:57:46 localhost kernel: SysRq : Show Locks Held
Oct 4 14:57:46 localhost kernel:
Oct 4 14:57:46 localhost kernel: Showing all locks held in the system:
Oct 4 14:57:46 localhost kernel: 4 locks held by kworker/u:0/5:
Oct 4 14:57:46 localhost kernel: #0: ((wiphy_name(local->hw.wiphy))){+.+.+.}, at: [<c0443d2d>] process_one_work+0x173/0x2c3
Oct 4 14:57:46 localhost kernel: #1: ((&local->work_work)){+.+.+.}, at: [<c0443d2d>] process_one_work+0x173/0x2c3
Oct 4 14:57:46 localhost kernel: #2: (&ifmgd->mtx){+.+.+.}, at: [<f8a9b7bd>] ieee80211_assoc_done+0x9b/0xf6 [mac80211]
Oct 4 14:57:46 localhost kernel: #3: (&local->iflist_mtx){+.+...}, at: [<f8aaa384>] ieee80211_set_channel_type+0x20/0xe3 [mac80211]
Oct 4 14:57:46 localhost kernel: 3 locks held by kworker/0:2/51:
Oct 4 14:57:46 localhost kernel: #0: (events){+.+.+.}, at: [<c0443d2d>] process_one_work+0x173/0x2c3
Oct 4 14:57:46 localhost kernel: #1: ((linkwatch_work).work){+.+.+.}, at: [<c0443d2d>] process_one_work+0x173/0x2c3
Oct 4 14:57:46 localhost kernel: #2: (rtnl_mutex){+.+.+.}, at: [<c06db8ea>] rtnl_lock+0xf/0x11
Oct 4 14:57:46 localhost kernel: 1 lock held by hald/1316:
Oct 4 14:57:46 localhost kernel: #0: (rtnl_mutex){+.+.+.}, at: [<c06db8ea>] rtnl_lock+0xf/0x11
Oct 4 14:57:46 localhost kernel: 1 lock held by ntpd/1388:
Oct 4 14:57:46 localhost kernel: #0: (rtnl_mutex){+.+.+.}, at: [<c06db8ea>] rtnl_lock+0xf/0x11
Oct 4 14:57:46 localhost kernel: 1 lock held by mingetty/1497:
Oct 4 14:57:46 localhost kernel: #0: (&tty->atomic_read_lock){+.+...}, at: [<c05f63f1>] n_tty_read+0x1d1/0x5ed
Oct 4 14:57:46 localhost kernel: 1 lock held by mingetty/1499:
Oct 4 14:57:46 localhost kernel: #0: (&tty->atomic_read_lock){+.+...}, at: [<c05f63f1>] n_tty_read+0x1d1/0x5ed
Oct 4 14:57:46 localhost kernel: 1 lock held by mingetty/1501:
Oct 4 14:57:46 localhost kernel: #0: (&tty->atomic_read_lock){+.+...}, at: [<c05f63f1>] n_tty_read+0x1d1/0x5ed
Oct 4 14:57:46 localhost kernel: 1 lock held by mingetty/1503:
Oct 4 14:57:46 localhost kernel: #0: (&tty->atomic_read_lock){+.+...}, at: [<c05f63f1>] n_tty_read+0x1d1/0x5ed
Oct 4 14:57:46 localhost kernel: 1 lock held by mingetty/1505:
Oct 4 14:57:46 localhost kernel: #0: (&tty->atomic_read_lock){+.+...}, at: [<c05f63f1>] n_tty_read+0x1d1/0x5ed
Oct 4 14:57:46 localhost kernel: 1 lock held by mingetty/1511:
Oct 4 14:57:46 localhost kernel: #0: (&tty->atomic_read_lock){+.+...}, at: [<c05f63f1>] n_tty_read+0x1d1/0x5ed
Oct 4 14:57:46 localhost kernel: 1 lock held by bash/1802:
Oct 4 14:57:46 localhost kernel: #0: (&tty->atomic_read_lock){+.+...}, at: [<c05f63f1>] n_tty_read+0x1d1/0x5ed
Oct 4 14:57:46 localhost kernel: 1 lock held by gnuserver/2195:
Oct 4 14:57:46 localhost kernel: #0: (rtnl_mutex){+.+.+.}, at: [<c06db8ea>] rtnl_lock+0xf/0x11
Oct 4 14:57:46 localhost kernel: 3 locks held by kworker/0:0/4000:
Oct 4 14:57:46 localhost kernel: #0: (events){+.+.+.}, at: [<c0443d2d>] process_one_work+0x173/0x2c3
Oct 4 14:57:46 localhost kernel: #1: (wireless_nlevent_work){+.+.+.}, at: [<c0443d2d>] process_one_work+0x173/0x2c3
Oct 4 14:57:46 localhost kernel: #2: (rtnl_mutex){+.+.+.}, at: [<c06db8ea>] rtnl_lock+0xf/0x11
Oct 4 14:57:46 localhost kernel: 4 locks held by ip/4035:
Oct 4 14:57:46 localhost kernel: #0: (rtnl_mutex){+.+.+.}, at: [<c06db8ea>] rtnl_lock+0xf/0x11
Oct 4 14:57:46 localhost kernel: #1: (&ifmgd->mtx){+.+.+.}, at: [<f8a9b7bd>] ieee80211_assoc_done+0x9b/0xf6 [mac80211]
Oct 4 14:57:46 localhost kernel: #2: (&local->iflist_mtx){+.+...}, at: [<f8a9b5ca>] ieee80211_assoc_success+0x68c/0x7e4 [mac80211]
Oct 4 14:57:46 localhost kernel: #3: (&ifmgd->mtx/1){+.+...}, at: [<f8aa8d37>] ieee80211_recalc_smps+0xb6/0x151 [mac80211]
Oct 4 14:57:46 localhost kernel: 1 lock held by iwconfig/4040:
Oct 4 14:57:46 localhost kernel: #0: (rtnl_mutex){+.+.+.}, at: [<c06db8ea>] rtnl_lock+0xf/0x11
Oct 4 14:57:46 localhost kernel: 2 locks held by bash/5275:
Oct 4 14:57:46 localhost kernel: #0: (sysrq_key_table_lock){......}, at: [<c06052d4>] __handle_sysrq+0x18/0x110
Oct 4 14:57:46 localhost kernel: #1: (tasklist_lock){.+.+..}, at: [<c0455c6f>] debug_show_all_locks+0x41/0x142
--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc http://www.candelatech.com
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