Jiri,
Since Linville's wireless-dev and your dscape were brought to
v2.6.18-rc3 in the past couple of days, my system has hung in bootup
if the bcm43xx card is installed. Usually, it stops just into run
level 5 while starting the network. Sometimes kdm comes up, but I am
unable to log in as the keyboard is dead, and power off is the only
recovery. If I hold the card out until I have logged in, everything works.
Today, I built the kernel with preempt disabled. The first boot
attempt failed as before. On the second try, I was watching the log
scroll by on the console at crtl-alt-f10, saw an oops of some kind,
and then the system started normally. I don't know why it started this
time after 10-12 failures, but it did. Attached is the message I saw
scroll by, which is a possible circular locking dependency between
dhcpcd and 80211.
Thanks, Larry
=======================================================
kernel: [ INFO: possible circular locking dependency detected ]
kernel: -------------------------------------------------------
kernel: dhcpcd/4627 is trying to acquire lock:
kernel: (&dev->queue_lock){-+..}, at: [<c02c0a86>]
dev_queue_xmit+0x56/0x290
kernel:
kernel: but task is already holding lock:
kernel: (&dev->_xmit_lock){-+..}, at: [<c02c0c56>]
dev_queue_xmit+0x226/0x290
larrylap kernel:
larrylap kernel: which lock already depends on the new lock.
kernel:
kernel:
kernel: the existing dependency chain (in reverse order) is:
kernel:
kernel: -> #1 (&dev->_xmit_lock){-+..}:
kernel: [<c01335cb>] lock_acquire+0x5b/0x80
kernel: [<c03114b0>] _spin_lock_bh+0x40/0x50
kernel: [<c02cc87c>] dev_activate+0x6c/0x130
kernel: [<c02bf11b>] dev_open+0x6b/0x90
kernel: [<e496812d>] ieee80211_open+0x18d/0x360 [80211]
kernel: [<c02bf0f3>] dev_open+0x43/0x90
kernel: [<c02be0a5>] dev_change_flags+0x55/0x130
kernel: [<c02fd2df>] devinet_ioctl+0x65f/0x6d0
kernel: [<c02fd648>] inet_ioctl+0x88/0xb0
kernel: [<c02b32fb>] sock_ioctl+0xbb/0x260
kernel: [<c017182b>] do_ioctl+0x2b/0x80
kernel: [<c01718d1>] vfs_ioctl+0x51/0x290
kernel: [<c0171b51>] sys_ioctl+0x41/0x60
kernel: [<c0103005>] sysenter_past_esp+0x56/0x8d
kernel:
kernel: -> #0 (&dev->queue_lock){-+..}:
kernel: [<c01335cb>] lock_acquire+0x5b/0x80
kernel: [<c031145b>] _spin_lock+0x3b/0x50
kernel: [<c02c0a86>] dev_queue_xmit+0x56/0x290
kernel: [<e49671af>] ieee80211_subif_start_xmit+0x2df/0x540 [80211]
kernel: [<c02c0932>] dev_hard_start_xmit+0x142/0x240
kernel: [<c02c0c74>] dev_queue_xmit+0x244/0x290
kernel: [<c030cd25>] packet_sendmsg_spkt+0x1c5/0x200
kernel: [<c02b497a>] sock_sendmsg+0xda/0x110
kernel: [<c02b4ce3>] sys_sendto+0xd3/0x100
kernel: [<c02b5382>] sys_socketcall+0x192/0x260
kernel: [<c0103005>] sysenter_past_esp+0x56/0x8d
kernel:
kernel: other info that might help us debug this:
kernel:
kernel: 1 lock held by dhcpcd/4627:
kernel: #0: (&dev->_xmit_lock){-+..}, at: [<c02c0c56>]
dev_queue_xmit+0x226/0x290
kernel:
kernel: stack backtrace:
kernel: [<c0103b67>] show_trace_log_lvl+0x197/0x1c0
kernel: [<c0104f7b>] show_trace+0x1b/0x20
kernel: [<c0104fa6>] dump_stack+0x26/0x30
kernel: [<c01312f1>] print_circular_bug_tail+0x61/0x70
kernel: [<c0133020>] __lock_acquire+0xae0/0xd60
kernel: [<c01335cb>] lock_acquire+0x5b/0x80
kernel: [<c031145b>] _spin_lock+0x3b/0x50
kernel: [<c02c0a86>] dev_queue_xmit+0x56/0x290
kernel: [<e49671af>] ieee80211_subif_start_xmit+0x2df/0x540 [80211]
kernel: [<c02c0932>] dev_hard_start_xmit+0x142/0x240
kernel: [<c02c0c74>] dev_queue_xmit+0x244/0x290
kernel: [<c030cd25>] packet_sendmsg_spkt+0x1c5/0x200
kernel: [<c02b497a>] sock_sendmsg+0xda/0x110
kernel: [<c02b4ce3>] sys_sendto+0xd3/0x100
kernel: [<c02b5382>] sys_socketcall+0x192/0x260
kernel: [<c0103005>] sysenter_past_esp+0x56/0x8d
kernel: [<b7f5a410>] 0xb7f5a410
kernel: [<c0104f7b>] show_trace+0x1b/0x20
kernel: [<c0104fa6>] dump_stack+0x26/0x30
kernel: [<c01312f1>] print_circular_bug_tail+0x61/0x70
kernel: [<c0133020>] __lock_acquire+0xae0/0xd60
kernel: [<c01335cb>] lock_acquire+0x5b/0x80
kernel: [<c031145b>] _spin_lock+0x3b/0x50
kernel: [<c02c0a86>] dev_queue_xmit+0x56/0x290
kernel: [<e49671af>] ieee80211_subif_start_xmit+0x2df/0x540 [80211]
kernel: [<c02c0932>] dev_hard_start_xmit+0x142/0x240
kernel: [<c02c0c74>] dev_queue_xmit+0x244/0x290
kernel: [<c030cd25>] packet_sendmsg_spkt+0x1c5/0x200
kernel: [<c02b497a>] sock_sendmsg+0xda/0x110
kernel: [<c02b4ce3>] sys_sendto+0xd3/0x100
kernel: [<c02b5382>] sys_socketcall+0x192/0x260
kernel: [<c0103005>] sysenter_past_esp+0x56/0x8d
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