Messages in this thread | | | Date | Sun, 2 Mar 2008 21:53:25 +0100 (MET) | From | Mikael Pettersson <> | Subject | [BUG] 2.6.25-rc2-git3 broke cdrecord |
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On my main workstation (Intel P965 chipset, ICH8 SATA driven by ahci, Samsung/Toshiba SH-203P SATA DVD writer, FC5 user-space), cdrecord stopped working on the 2.6.25-rc3 kernel, with the complaint:
Warning: controller returns zero sized CD capabilities page. Warning: controller returns wrong page 0 for CD capabilities page (2A).
There's nothing in dmesg to suggest that the kernel has experienced some problem.
2.6.25-rc2-git2 was the last working kernel, 2.6.25-rc2-git3 up to today's 2.6.25-rc3-git3 are all non-working.
I've narrowed the cause down to these two commits in 2.6.25-rc2-git3:
40b01b9bbdf51ae543a04744283bf2d56c4a6afa block: update bio according to DMA alignment padding
6b00769fe1502b4ad97bb327ef7ac971b208bfb5 block: add request->raw_data_len
Four or so subsequent commits depend on the second of these, so it's easier to test them by applying them to -git2 than to revert them.
Also, these two need to be treated as a unit. With only the first applied, I get a massive delay as init tries to start udev, and then if I try cdrecord it hangs in an unkillable state.
I've put some information in <http://user.it.uu.se/~mikpe/linux/bug-2.6.25-rc3-cdrecord/>: - the kernel's .config - cdrecord -VV dev=/dev/scd0 blank=fast output for 2.6.25-rc2-git2 and -git3 - strace -v logs for the above cdrecord runs
/Mikael
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