Deterministic panic 9.0-BETA2 with X + drm/radeon

Andriy Gapon avg at FreeBSD.org
Wed Sep 21 09:33:13 UTC 2011


on 21/09/2011 10:12 Lawrence Stewart said the following:
> Kernel page fault with the following non-sleepable locks held:
> exclusive sleep mutex drmdev (drmdev) r = 0 (0xfffffe000f831ca0) locked @
> /usr/src/sys/modules/drm/drm/../../../dev/drm/drm_drv.c:791

I think that this is a well-known but not yet fixed issue.
I think that it should already be addressed in the general drm part of kib's
Intel GEM code.
Please see this thread for some earlier history:
http://lists.freebsd.org/pipermail/freebsd-current/2010-November/020914.html

I personally keep using a patch from that thread which turns the panic into a LOR.

> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
> kdb_backtrace() at kdb_backtrace+0x37
> _witness_debugger() at _witness_debugger+0x2e
> witness_warn() at witness_warn+0x2c4
> trap() at trap+0x2fe
> calltrap() at calltrap+0x8
> --- trap 0xc, rip = 0xffffffff80b09af3, rsp = 0xffffff834d687950, rbp =
> 0xffffff834d6879a0 ---
> copyout() at copyout+0x43
> drm_ioctl() at drm_ioctl+0x2f2
> devfs_ioctl_f() at devfs_ioctl_f+0x7a
> kern_ioctl() at kern_ioctl+0xcd
> ioctl() at ioctl+0xfd
> amd64_syscall() at amd64_syscall+0x3ba
> Xfast_syscall() at Xfast_syscall+0xf7
> --- syscall (54, FreeBSD ELF64, ioctl), rip = 0x802ca437c, rsp = 0x7fffffffd968,
> rbp = 0x7fffffffd9b0 ---


-- 
Andriy Gapon


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