CVS commit: src/sys/crypto/cprng_fast

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Sat Aug  5 11:39:18 UTC 2023

Modified Files:
        src/sys/crypto/cprng_fast: cprng_fast.c

Log Message:
cprng_fast(9): Drop and retake percpu reference across cprng_strong.

cprng_strong may sleep on an adaptive lock (via entropy_extract),
which invalidates percpu(9) references.

Discovered by stumbling upon this panic in a test run:

panic: kernel diagnostic assertion "(cprng == percpu_getref(cprng_fast_percpu)) && (percpu_putref(cprng_fast_percpu), true)" failed: file 
"/home/riastradh/netbsd/current/src/sys/rump/librump/rumpkern/../../../crypto/cprng_fast/cprng_fast.c", line 117

XXX pullup-10


To generate a diff of this commit:
cvs rdiff -u -r1.18 -r1.19 src/sys/crypto/cprng_fast/cprng_fast.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.