[lkml]   [2003]   [Jan]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Subject2.4.20aa1 ide-scsi crashes
under heavy I/O load for my scsi-emulated cdrom 2.4.20aa1 crashes at

drivers/scsi/scsi_dma:155 with
panic("scsi_free:Trying to free unused memory")

panic(..) somehow refuses to print the call trace because "IEEE in interrupt
handler - no sync".

The only scsi module I'm using is ide-scsi. As I browsed the aa patch I
recognized that a few &io_request_lock have been exchanged for
"q->queue_lock". But ide-scsi is still locking on io_request_lock. This is
probably the source of the race condition. However I'm not sure because I
think q->queue_lock is being initialized to &io_request_lock, so it should
still be the same lock.

See drivers/scsi/ide-scsi:295 or
drivers/scsi/ide-scsi:850 (Why isn't there a lock in that case?)

(done) referrs to sr.c:rw_intr which calls scsi_io_completion which calls
the panic(..)-ing scsi_free)

Any guesses?

Regards, Clemens
Please CC answers, /me not on list.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:32    [W:0.038 / U:1.200 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site