Date: Sun, 7 Mar 2010 02:07:18 -0800 From: Garrett Cooper <yanefbsd@gmail.com> To: Alexander Motin <mav@freebsd.org>, Hans Petter Selasky <hselasky@c2i.net> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Removing USB keyboard after filesystems synced causes panic with destroyed mutex twa(4)? Message-ID: <7d6fde3d1003070207q621e69ado2cb64e431feacd76@mail.gmail.com>
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Hi Alexander and Hans,
I recently did the following which generated a panic on a
9-CURRENT kernel compiled on the 26th:
1. Executed reboot
2. Removed keyboard.
3. Some time after `All buffers synced\nUptime: ...' was displayed,
the keyboard was registered disconnected.
4. The interrupt was delivered to my twa(4) enabled card and the
kernel panicked, like so:
ugen2.2: <Mitsumi Electric> at usbus2 (disconnected)
uhub8: at uhub2, port 1, addr 2 (disconnected)
ugen2.3: <Mitsumi Electric> at usbus2 (disconnected)
ukbd0: at uhub8, port 3, addr 3 (disconnected)
uhid0: at uhub8, port 3, addr 3 (disconnected)
panic: mtx_lock_spin() of destroyed mutex @ /usr/src/sys/dev/twa/tw_cl_intr.c:88
cpuid = 1
KDB: enter: panic
[thread pid 12 tid 100025 ]
Stopped at kdb_enter+0x3d: movq $0,0x40289c(%rip)
db>
I wish I could provide you with more details, but unfortunately I
the USB bus isn't registering the fact that I'm reattaching the
keyboard right now and the box won't reboot automatically :( (didn't
set the right sysctl beforehand to panic automatically). I'll try and
reproduce the issue again, but I was just wondering whether or not you
guys had seen this problem before.
Thanks,
-Garrett
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