Opened 4 weeks ago

#32472 new defect

buf_flush_to_tls: Non-fatal assertion !(flushlen > *buf_flushlen)

Reported by: dgoulet Owned by:
Priority: Medium Milestone: Tor: 0.4.3.x-final
Component: Core Tor/Tor Version:
Severity: Normal Keywords: assert, tor-connection
Cc: Actual Points:
Parent ID: Points:
Reviewer: Sponsor:


Had this on my relay because I ran out of disk space due to debug.log being on.

Nov 05 12:39:01.801 [warn] tor_bug_occurred_(): Bug: src/lib/tls/buffers_tls.c:152: buf_flush_to_tls: Non-fatal assertion !(flushlen > *buf_flushlen) failed. (Future instances of this warning will be silenced.) (on Tor 4413b98190d94b54)

So the code that exploded is:

  if (BUG(flushlen > *buf_flushlen)) {
    flushlen = *buf_flushlen;

It was triggered by lack of disk space for sure.

The only thing I can see is if connection_handle_write_impl() was called with force = 1 which happens with connection_flush() which makes tor use the bucket limit instead of the outbuf "flushlen" and thus could lead to that assert().

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