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SubjectRamdisk / sync deadlock
Date
From

System: SGI 1400 SMP w/ sym53c8xx SCSI.
Kernel: 2.4.0-test5

I've been hitting a SMP deadlock caused by creating traffic
on a ramdisk at the same time as syncing. The backtraces show
the locks causing the deadlock. I don't know how to fix this
one myself, so here's the info in case it helps...

CPU A

insert_into_queues <takes lru_list_lock>
getblk
rd_request
generic_unplug_device <takes io_request_lock>
__wait_on_buffer
unmap_buffer
block_flushpage
truncate_inode_pages
vmtruncate
inode_setattr
notify_change
do_truncate
open_namei
filp_open
sys_open
system_call

CPU B

sym53c8xx_intr <takes io_request_lock>
handle_IRQ_event
<scsi interrupt here>
sync_buffers <takes lru_list_lock>
fsync_dev
sys_sync
system_call

Regards,
-----------------------------------------------------
Daniel Moore dxm@sgi.com
R&D Software Engineer Phone: +61-3-98348209
SGI Performance Tools Group Fax: +61-3-98132378
-----------------------------------------------------

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