[Dovecot] imap process consuming 100% CPU (Dovecot 1.0.3)

[Robert Tomanek]

Hi,

Sunday, September 2, 2007, 22:42:37, you wrote:
>> 0x0806049d in imap_sync_more (ctx=0x80d9770) at imap-sync.c:104
>> 104                     if (ctx->seq == 0) {

 A short follow-up on this, looks like an infinite loop to me, unless
 some threading magic is supposed to happen here:
> (gdb) step
> 120                             if (ctx->sync_rec.seq1 > ctx->messages_count)
> (gdb)
> 104                     if (ctx->seq == 0) {
> (gdb)
> 117                     if (ctx->sync_rec.seq2 > ctx->messages_count) {
> (gdb)
> 120                             if (ctx->sync_rec.seq1 > ctx->messages_count)
> (gdb)
> 104                     if (ctx->seq == 0) {
> (gdb)
> 117                     if (ctx->sync_rec.seq2 > ctx->messages_count) {
> (gdb)
> 120                             if (ctx->sync_rec.seq1 > ctx->messages_count)
> (gdb) print ctx->seq
> $1 = 8317
> (gdb) print ctx->sync_rec.seq1
> $2 = 8318
> (gdb) print ctx->sync_rec.seq2
> $3 = 8320
> (gdb) print ctx->messages_count
> $4 = 8317

 The corresponding code in imap-sync.c is:
103:        for (;;) {
104:                if (ctx->seq == 0) {
105:                        /* get next one */
106:                        ret = mailbox_sync_next(ctx->sync_ctx,
107:                                                &ctx->sync_rec);
108:                        if (ret <= 0) {
109:                                if (ret == 0) {
110:                                        /* all finished ok */
111:                                        ret = 1;
112:                                }
113:                                break;
114:                        }
115:                }
116:
117:               if (ctx->sync_rec.seq2 > ctx->messages_count) {
118:                        /* don't send change notifications of messages we
119:                           haven't even announced to client yet */
120:                        if (ctx->sync_rec.seq1 > ctx->messages_count)
121:                                continue;
122:                        ctx->sync_rec.seq2 = ctx->messages_count;
123:                }
 ...
185:        }

-- 
Best regards,
 Robert Tomanek                           mailto:rth23 at poczta.onet.pl