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micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="F48i1IcR95jbAHy7TdU7lTov7a4DXplBT" X-MBO-SPAM-Probability: X-Rspamd-Score: -8.03 / 15.00 / 15.00 X-Rspamd-Queue-Id: 748231790 X-Rspamd-UID: 964a70 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --F48i1IcR95jbAHy7TdU7lTov7a4DXplBT Content-Type: multipart/mixed; boundary="C6OtMDowdi3X5EdcdyaqKwqgwywdS9EGJ" --C6OtMDowdi3X5EdcdyaqKwqgwywdS9EGJ Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Bit the bullet, bisected v5.5..v5.6 and found this: 0ddad21d3e99c743a3aa473121dc5561679e26bb is the first bad commit commit 0ddad21d3e99c743a3aa473121dc5561679e26bb Author: Linus Torvalds Date: Mon Dec 9 09:48:27 2019 -0800 pipe: use exclusive waits when reading or writing [...] [ Note! This kernel improvement seems to be very good at triggering a race condition in the make jobserver (in GNU make 4.2.1) for me. It's a long known bug that was fixed back in June 2017 by GNU make commit b552b0525198 ("[SV 51159] Use a non-blocking read with pselect to avoid hangs."). But there wasn't a new release of GNU make until 4.3 on Jan 19 2020, so a number of distributions may still have the buggy version. Some have backported the fix to their 4.2.1 release, though, and even without the fix it's quite timing-dependent whether the bug actually is hit. ] [...] After updating "make" to 4.3 all is well. Feynman was right again. ;) --=20 The truth always turns out to be simpler than you thought. Richard Feynman --C6OtMDowdi3X5EdcdyaqKwqgwywdS9EGJ-- --F48i1IcR95jbAHy7TdU7lTov7a4DXplBT Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEE6yx5PjBNuGB2qJXG8OH3JiWK+PUFAmBVCUUACgkQ8OH3JiWK +PUnGQ//b+LX1FHmkDq+WBpiR6v16MPxKR6cJsV9Mki3+t9Uml3Sd2/JMtEMYMWt G2qNvUFNhlEcM5JPBvZKaEOrhJKi++I7QeCoUDKAHGS6EwW+uNBgA/HE2WrnoAyQ yTudhO6dBGX2+EhgVEOIMMfXTRBp8jW1gg4QaqiHs7l1hJsy8/UdvlgwJszwU3Fv 7TPzitmFXfAwIEBQwlEnxSVgs7BeDmHkftd6ayV2GuWdy5VLHP18NoTEgQ5Fx3nF Jfm3KoBL01kNaNhMDOX7acRO60qNscHH72UpAVYzgo85fFLp00hpNJAy00Y4Vm+d n6mkqx7BrNPmIcmyogkbQh1vVfMuEICGwaaji7S7fAcF66wzQniQCqJycnFUSi+W ZR2LIRExm50gFE1vGeMZPhstWj1nvm7+HXb0MFH458YarMJ3ywDPBajltyabAL/Q KqOtwrB37lJZRe+Jd6H1AwaTuw2JDGQP9UvoXmia1AJaCopqDog1u1Kp6FMMUrQC Ef1OhVxNCk2RCIz370etvHTEv9t0d2DzLAwl09k+NfIjyiNea6PEFY6qYDav3UcV 4ymHp5jX3/E22EOorKtRvGG4+JVixvPlzsAN7FnI2soWAC4UvR9nhU/2YIx2TeaJ k0jNYGCKtuW4i930zQfs11K5+VDKMw/iUEM+OuHtBHCcNl8u9Mg= =ekST -----END PGP SIGNATURE----- --F48i1IcR95jbAHy7TdU7lTov7a4DXplBT--