Hi, especially to Pádraig, I wrote: > Control: affects -1 aptitude-robot
JFYI: The fix for /etc/cron.daily/aptitude-robot, which triggers the issue in its non-bash compatibility mode, is to change its shebang line from "#!/bin/sh" to "#!/bin/bash". (dpkg-reconfigure dash or bash to switch /bin/sh to bash unfortunately no more works since Debian 12. Cc'ing andrewsh@d.o for that comment.) Pádraig Brady wrote: > cksum since v9.0 checks at runtime whether pclmul is supported. > It seems that check is not working appropriately on a Xen DomU. > The routine in question is pclmul_supported() at: > https://github.com/coreutils/coreutils/blob/b841f111/src/cksum.c#L160-L191 > > That either suggests xen is incorrectly setting PCLMUL and AVX bits, > or perhaps these two bits are not sufficient. > Hmm I wonder do we also need to explicitly check for SSSE3 support? > > I.e. I wonder does cksum built with the following help? […] > diff --git a/src/cksum.c b/src/cksum.c > index 85afab0ac..98733dadf 100644 > --- a/src/cksum.c > +++ b/src/cksum.c > @@ -172,7 +172,7 @@ pclmul_supported (void) > return false; > } > > - if (! (ecx & bit_PCLMUL) || ! (ecx & bit_AVX)) > + if (! (ecx & bit_PCLMUL) || ! (ecx & bit_AVX) || ! (ecx & bit_SSSE3)) > { > if (cksum_debug) > error (0, 0, "%s", _("pclmul support not detected")); No, the patch unfortunately didn't help: # dpkg -l coreutils Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-==============-==============-============-================================= ii coreutils 9.1-1+abetest1 amd64 GNU core utilities # while :; do dd if=/dev/urandom count=1 2> /dev/null | cksum ; done Illegal instruction 3835785655 512 1264218280 512 1265063674 512 3358845510 512 3390842004 512 658376191 512 3092360732 512 57993113 512 4257983404 512 2816803635 512 4082554882 512 1183251249 512 3097645355 512 3238771197 512 2777729543 512 3714227940 512 3331192910 512 1805379772 512 2540013463 512 294869588 512 222826476 512 1622837079 512 2515049677 512 3855944559 512 4031692020 512 4041321365 512 1802184575 512 2031964685 512 2781701490 512 460914961 512 Illegal instruction 3835252621 512 412678137 512 200496131 512 194185340 512 3286885624 512 Illegal instruction 2202092457 512 418097046 512 2216824095 512 3861063118 512 4214986749 512 259193791 512 2169514763 512 892443556 512 705097717 512 1758684834 512 2206099568 512 1780257589 512 82224867 512 Illegal instruction 2247709549 512 […] Thanks for trying to find a patch anyways. > # while :; do dd if=/dev/urandom count=1 2> /dev/null | cksum ; done > 1758277878 512 > 2101634611 512 > Illegal instruction > Illegal instruction > Illegal instruction > Illegal instruction > Illegal instruction > Illegal instruction > Illegal instruction > Illegal instruction > Illegal instruction > Illegal instruction > Illegal instruction > 2704754638 512 > Illegal instruction > 4028135672 512 > 2625667858 512 > Illegal instruction > Illegal instruction > Illegal instruction One weird thing: The "Illegal instruction" happens much more seldom today on the second affected DomU with the patched cksum (above) as well as with the unpatched cksum (below), not sure why. Maybe this also gives some hint on where to look for the cause of this issue. 1829747093 512 Illegal instruction 198577731 512 428043084 512 3695864207 512 2965121539 512 1048852751 512 3278958013 512 Illegal instruction 1852035202 512 2493300527 512 2163958493 512 1863124891 512 2734183826 512 1004299335 512 3257604044 512 1233477715 512 1720570219 512 3013835401 512 3175649825 512 1828643038 512 3146557230 512 911790943 512 1016865138 512 3033781151 512 Illegal instruction 2243248050 512 The DomU on which I initially discovered the issue still hits it as hard as before or maybe even harder now: […] Illegal instruction 3963278313 512 Illegal instruction 118145379 512 211261244 512 Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction 1435849033 512 Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction Illegal instruction […] This intensity happens on that DomU with both, with and without the patch and it doesn't seem to make a difference if e.g. debug symbols are installed or not. Regards, Axel -- ,''`. | Axel Beckert <a...@debian.org>, https://people.debian.org/~abe/ : :' : | Debian Developer, ftp.ch.debian.org Admin `. `' | 4096R: 2517 B724 C5F6 CA99 5329 6E61 2FF9 CD59 6126 16B5 `- | 1024D: F067 EA27 26B9 C3FC 1486 202E C09E 1D89 9593 0EDE
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