On Tue, 2010-06-15 at 21:04 -0500, Mike Abbott wrote:
6 imap 0x0000000105867333 imap_refresh_proctitle + 218 -> 7 imap 0x00000001058666ce cmd_sync_continue + 199 ->
But how does this happen? Did it optimize away some functions
Yeah optimized out tail-calls, e.g. client_destroy -> imap_refresh_proctitle and client_command_free -> imap_refresh_proctitle. I have been digging deeper and found that sometimes imap_clients->command_queue->name points to garbage, so imap_refresh_proctitle is appending 500MB strings of garbage.
Is it complete garbage or 0xde character? (Or if you don't use --with-devel-checks then 0xde shouldn't be appearing.)
Combined with a little command pipelining this leads to 4+GB data stack pools. I'll resume digging tomorrow. Let me know if you need any info; I can reproduce this in seconds.
I couldn't find anything obviously wrong in the code.