Messages in this thread | | | Date | Wed, 3 Feb 2010 23:56:42 -0800 | From | Andy Isaacson <> | Subject | Re: [2.6.33-rc6-git regression] idr fix breaks Xorg |
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On Wed, Feb 03, 2010 at 05:28:37PM -0800, Andy Isaacson wrote: > On my Dell Latitude e4300 commit 859ddf0974 ("idr: fix a critical > misallocation bug") causes Xorg to segfault with the following > backtrace: > > ... > (II) intel(0): Initializing HW Cursor > (II) intel(0): No memory allocations > > Backtrace: > 0: /usr/bin/X11/X(xorg_backtrace+0x26) [0x4f00c6] > 1: /usr/bin/X11/X(xf86SigHandler+0x41) [0x4852c1] > 2: /lib/libc.so.6 [0x7fbdad071530] > 3: /usr/lib/xorg/modules/drivers//intel_drv.so [0x7fbdab8a1cbd] > 4: /usr/lib/xorg/modules/drivers//intel_drv.so(gen4_render_state_init+0x416) [0x > 7fbdab8a2a36] > 5: /usr/lib/xorg/modules/drivers//intel_drv.so [0x7fbdab87d3e8] > 6: /usr/lib/xorg/modules/drivers//intel_drv.so [0x7fbdab87e6fb] > 7: /usr/bin/X11/X(AddScreen+0x1d4) [0x4337c4] > 8: /usr/bin/X11/X(InitOutput+0x76f) [0x46f27f] > 9: /usr/bin/X11/X(main+0x1fe) [0x433ece] > 10: /lib/libc.so.6(__libc_start_main+0xfd) [0x7fbdad05cabd] > 11: /usr/bin/X11/X [0x433509] > Saw signal 11. Server aborting.
strace perhaps shows some more illuminating results; I suspect the SEGV is due to a failed ioctl. (This is a different run than the above, obviously.)
1265267921.566623 ioctl(8, 0xc020645e, 0x7fffe2196980) = 0 1265267921.566944 ioctl(8, 0x400c645f, 0x7fffe21969a0) = 0 1265267921.567272 brk(0x20e7000) = 0x20e7000 1265267921.567602 ioctl(8, 0x40046460, 0x7fffe21969a0) = 0 1265267921.567922 ioctl(8, 0xc010645b, 0x7fffe2196990) = 0 1265267921.568269 ioctl(8, 0xc020645e, 0x7fffe2196980) = -1 EBADF (Bad file descriptor) 1265267921.568649 write(2, "../../../libdrm/intel/intel_bufmgr_gem.c:637: Error mapping buffer 1073741824 (gen4 WM state): Bad file descriptor .\n", 117) = 117 1265267921.569039 --- SIGSEGV (Segmentation fault) @ 0 (0) ---
The full strace is at http://web.hexapodia.org/~adi/bugs/201002-xorg-segv/Xorg.strace
-andy
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