Re: 2.2.1-ac6 CDROM bug (not in 2.2.1-vanilla)

Paul Slootman (paul@wau.mis.ah.nl)
Sun, 21 Feb 1999 14:51:38 +0100


linux-kernel@gmx.de wrote:
>On a system with 2 SCSI CD-ROM drives, the mount system call hangs at
>bootup when both drives are empty; the kernel says
>"bug: kernel timer added twice at c0181471.".
>
>The c0181471 address is nowhere near the functions listed in ksyms.

Actually, I expect it's in scsi_sleep(), in scsi_error.c.
I get c0199e95. and according to /proc/ksyms: c0199e24 scsi_sleep_R35962bf8
(close enough). scsi_sleep() calls "add_timer(&timer)".

I can reproduce this by inserting a cdrom, and issuing a mount command
before the drive is ready. Plain 2.2.1 does NOT have this problem;
there, the attempt is retried after a couple of seconds, and then
succeeds. On 2.2.1-ac6, the mount process hangs in state 'D', and can
only be fixed by rebooting.

FYI: Buslogic 958 with Plextor PX-12CS on Tyan Titan III with Winchip 240
(CentaurHauls C6-2 according to /proc/cpuinfo).

Paul Slootman

-- 
home: paul@wurtel.demon.nl | work: paul@murphy.nl | debian: paul@debian.org
http://www.wurtel.demon.nl | Murphy Software,   Enschede,   the Netherlands

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