Opened 3 years ago
Last modified 2 years ago
#17194 new bug
Webkit crash in unixShmLock for sqlite
| Reported by: | nephele | Owned by: | pulkomandy |
|---|---|---|---|
| Priority: | normal | Milestone: | Unscheduled |
| Component: | Kits/Web Kit | Version: | R1/Development |
| Keywords: | Cc: | ||
| Blocked By: | Blocking: | ||
| Platform: | All |
Description
It seems webkit crashed while trying to lock memory to write to the icons database.
This happened after opening http://pulkomandy.tk/_/_Development/_Some%20random%20thoughts%20about%20XMPP%20spaces in WebPositive with it already running.
It did not happen on subsequent visits. hrev55274
As a bit of a related question, why are we keeping the icon database? are the icons displayed anywhere?
Attachments (7)
Change History (11)
by , 3 years ago
| Attachment: | WebPositive-2822-debug-17-08-2021-16-43-51.report added |
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comment:1 by , 3 years ago
comment:2 by , 3 years ago
I think the icon database has been broken for a few years but no one ever reported an issue about it.
I don't recall ever seeing the globe icon be something else... But then I also didn't know this was an intended feature. :)
by , 3 years ago
| Attachment: | HaikuLauncher-552825-debug-11-09-2021-21-34-12.report added |
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comment:3 by , 3 years ago
Debug report for "HaikuLauncher https://git.gryphno.de/nephele/haikuwebkit "
This is with sqlite compiled with "--enable-debug" though strangely the function contents isn't visible still... but there is a lot more "Bad Adress" in the report. :)
by , 2 years ago
| Attachment: | HaikuLauncher-152618-debug-20-11-2021-20-27-42.report added |
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HaikuLauncher crash
by , 2 years ago
| Attachment: | WebpageIcons.db added |
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by , 2 years ago
| Attachment: | WebpageIcons.db-shm added |
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by , 2 years ago
| Attachment: | WebpageIcons.db-wal added |
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comment:4 by , 2 years ago
I have reproduced it without involving the icon database. Now just visiting github.com crashes for me, in the html5 localstorage support (which also uses sqlite).
It seems pDbFd->pShm is NULL and sqlite dereferences it in unixShmLock.
This pointer should have been initialized by unixOpenSharedMemory called by unixShmMap. It should contain things related to the db-shm file which allows multiple processes/threads to coordinate access to the database.
I don't know why the pointer is NULL. Now I'm trying to build WebKit with some debug logs enabled to see if that helps investigating (there are a lot of logs in the SQLite code but they are disabled by default).
In theory the icons are displayed in the navigation bar (the default globe icon should show only if the website has nothing else) and when you create bookmarks. Possibly also in browser tabs, I don't remember, but it would make sense to have it there. I think the icon database has been broken for a few years but no one ever reported an issue about it.