[issue2142] kernel crash - Fatal trap 12 - softdep related

["Thomas Nikolajsen \(via DragonFly issue tracker\)" <sinknull@xxxxxxxxxxxxxxxxxxxxx>]

New submission from Thomas Nikolajsen <thomas.nikolajsen@mail.dk>:

With recent(*) master I get kernel crash during boot.

This is i386 SMP kernel on UP system.

Turning softdep off (tunefs -n disable FS) on all file systems is work around.

After mounting a FS R/W with softdep enabled, crash is seen after
writing to FS: one small file didn't trigger, more/bigger files did.

* october 8th 2011, e.g. commit 4a568af990f84a14cd90c5fbe6b6f1709d41ca82.
Problem seems to be in TRIM commit e0fb398bfbef1fb6d12dfb8308cdc83ce663cbc2,
as I didn't experience problem a few commits before.

- kernel crash; core dump not possible
Fatal trap 12: supervisor read, page not present
. .
page fault while in kernel mode
. .
- trace
ffs_blkfree+0x18
process_worklist_item+0x17a
softdep_process_worklist+0xb8
bio_ops_sync+0x34
syncer_thread+0xf9
kthread_exit

- another crash had first line in trace different
ffs_blkfree+0x1e

----------
messages: 10161
nosy: thomas.nikolajsen
priority: critical
status: unread
title: kernel crash - Fatal trap 12 - softdep related

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