[haiku-bugs] Re: [Haiku] #9806: Opening FAT32 partition yields PANIC: double mutex lock
- From: "bonefish" <trac@xxxxxxxxxxxx>
- Date: Sat, 01 Jun 2013 18:58:37 -0000
#9806: Opening FAT32 partition yields PANIC: double mutex lock
--------------------------------+----------------------------
Reporter: ttcoder | Owner: nobody
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: File Systems/FAT | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Blocking:
Has a Patch: 0 | Platform: All
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Comment (by bonefish):
The main issue is not so much the double mutex lock. The reason for that
is the invocation of `dprintf()` with an invalid string pointer, so a page
fault happens, and the page fault code tries to print some debug output
(via `dprintf()`), causing the double lock. The bug is in the fat module's
[http://cgit.haiku-os.org/haiku/tree/src/add-
ons/kernel/file_systems/fat/dir.c?id=hrev45732#n92 _next_dirent_()]. At a
quick glance the `filename` variable that is passed points to a buffer
that hasn't been initialized yet -- that happens later in the function
when an entry has been found -- so it doesn't make any sense to print it.
There's a `dprintf()` a few lines earlier with the same issue. What may
make some sense to print are the information passed to the `DPRINTF()` in
line 81.
--
Ticket URL: <http://dev.haiku-os.org/ticket/9806#comment:4>
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