Re: bin/54068: ATF tests hung in pipe2_consume

To: gnats-admin%netbsd.org@localhost,netbsd-bugs%netbsd.org@localhost,gson%gson.org@localhost (Andreas Gustafsson)
Subject: Re: bin/54068: ATF tests hung in pipe2_consume
From: Andreas Gustafsson <gson%gson.org@localhost>
Date: Tue, 23 Apr 2019 07:40:01 +0000 (UTC)
The following reply was made to PR bin/54068; it has been noted by GNATS.

From: Andreas Gustafsson <gson%gson.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: bin/54068: ATF tests hung in pipe2_consume
Date: Tue, 23 Apr 2019 10:36:10 +0300

 The following one-liner will reliably reproduce the bug on my 12-core
 amd64 system, yielding a nonzero exit status when the bug is present:
 
   timeout 200 sh -c 'cd /usr/tests/lib/libc/sys && for i in $(seq 200); do echo -n .; atf-run t_pipe2 >>log; done'
 
 I ran an automated bisection using the above, and found that the
 problem appeared during a period of build breakage on Dec 22, 2016.
 I have managed to work around some, but not all of the breakage,
 narrowing down the time when the problem appeared to the following
 commits:
 
   2016.12.22.13.26.24 cherry src/sys/uvm/Makefile 1.10
   2016.12.22.13.26.24 cherry src/sys/uvm/uvm.h 1.67
   2016.12.22.13.26.24 cherry src/sys/uvm/uvm_extern.h 1.200
   2016.12.22.13.26.25 cherry src/sys/uvm/uvm_page.c 1.188
   2016.12.22.13.42.14 mlelstv src/sys/dev/dksubr.c 1.94
   2016.12.22.13.42.14 mlelstv src/sys/dev/dkvar.h 1.28
   2016.12.22.13.42.14 mlelstv src/sys/sys/param.h 1.519
   2016.12.22.14.11.58 mlelstv src/sys/kern/kern_runq.c 1.46
   2016.12.22.14.47.53 cherry src/sys/arch/acorn26/acorn26/Attic/start.c 1.21
   2016.12.22.14.47.53 cherry src/sys/arch/acorn32/acorn32/rpc_machdep.c 1.91
   2016.12.22.14.47.53 cherry src/sys/arch/acorn32/eb7500atx/eb7500atx_machdep.c 1.29
   2016.12.22.14.47.54 cherry src/sys/arch/algor/algor/machdep.c 1.55
   2016.12.22.14.47.54 cherry src/sys/arch/alpha/alpha/machdep.c 1.348
   2016.12.22.14.47.54 cherry src/sys/arch/amd64/amd64/machdep.c 1.241
   2016.12.22.14.47.54 cherry src/sys/arch/amiga/amiga/pmap_bootstrap.c 1.10
   2016.12.22.14.47.54 cherry src/sys/arch/amigappc/amigappc/machdep.c 1.52
   2016.12.22.14.47.54 cherry src/sys/arch/arc/arc/machdep.c 1.130
   2016.12.22.14.47.54 cherry src/sys/arch/arm/arm32/arm32_boot.c 1.18
   2016.12.22.14.47.54 cherry src/sys/arch/arm/at91/at91bus.c 1.19
   2016.12.22.14.47.54 cherry src/sys/arch/atari/atari/pmap_bootstrap.c 1.8
   2016.12.22.14.47.54 cherry src/sys/arch/cobalt/cobalt/machdep.c 1.119
   2016.12.22.14.47.54 cherry src/sys/arch/emips/emips/machdep.c 1.12
   2016.12.22.14.47.54 cherry src/sys/arch/epoc32/epoc32/machdep.c 1.5
   2016.12.22.14.47.55 cherry src/sys/arch/evbarm/adi_brh/brh_machdep.c 1.44
   2016.12.22.14.47.55 cherry src/sys/arch/evbarm/armadillo/armadillo9_machdep.c 1.29
   2016.12.22.14.47.55 cherry src/sys/arch/evbarm/g42xxeb/g42xxeb_machdep.c 1.30
   2016.12.22.14.47.55 cherry src/sys/arch/evbarm/gemini/gemini_machdep.c 1.23
   2016.12.22.14.47.55 cherry src/sys/arch/evbarm/hdl_g/hdlg_machdep.c 1.23
   2016.12.22.14.47.55 cherry src/sys/arch/evbarm/imx31/imx31lk_machdep.c 1.19
   2016.12.22.14.47.55 cherry src/sys/arch/evbarm/iq80310/iq80310_machdep.c 1.86
   2016.12.22.14.47.55 cherry src/sys/arch/evbarm/iq80321/iq80321_machdep.c 1.56
   2016.12.22.14.47.55 cherry src/sys/arch/evbarm/ixdp425/ixdp425_machdep.c 1.37
   2016.12.22.14.47.55 cherry src/sys/arch/evbarm/ixm1200/ixm1200_machdep.c 1.57
   2016.12.22.14.47.55 cherry src/sys/arch/evbarm/lubbock/lubbock_machdep.c 1.34
   2016.12.22.14.47.55 cherry src/sys/arch/evbarm/mini2440/mini2440_machdep.c 1.10
   2016.12.22.14.47.56 cherry src/sys/arch/evbarm/npwr_fc/npwr_fc_machdep.c 1.21
   2016.12.22.14.47.56 cherry src/sys/arch/evbarm/nslu2/nslu2_machdep.c 1.27
   2016.12.22.14.47.56 cherry src/sys/arch/evbarm/osk5912/osk5912_machdep.c 1.16
   2016.12.22.14.47.56 cherry src/sys/arch/evbarm/smdk2xx0/smdk2410_machdep.c 1.36
   2016.12.22.14.47.56 cherry src/sys/arch/evbarm/smdk2xx0/smdk2800_machdep.c 1.43
   2016.12.22.14.47.56 cherry src/sys/arch/evbarm/tisdp24xx/sdp24xx_machdep.c 1.17
   2016.12.22.14.47.56 cherry src/sys/arch/evbarm/tsarm/tsarm_machdep.c 1.24
   2016.12.22.14.47.56 cherry src/sys/arch/evbarm/viper/viper_machdep.c 1.25
   2016.12.22.14.47.56 cherry src/sys/arch/evbmips/adm5120/machdep.c 1.25
   2016.12.22.14.47.56 cherry src/sys/arch/evbmips/alchemy/machdep.c 1.56
   2016.12.22.14.47.56 cherry src/sys/arch/evbmips/atheros/machdep.c 1.31
   2016.12.22.14.47.56 cherry src/sys/arch/evbmips/cavium/machdep.c 1.9
   2016.12.22.14.47.56 cherry src/sys/arch/evbmips/gdium/machdep.c 1.20
   2016.12.22.14.47.57 cherry src/sys/arch/evbmips/ingenic/machdep.c 1.12
   2016.12.22.14.47.57 cherry src/sys/arch/evbmips/loongson/machdep.c 1.7
   2016.12.22.14.47.57 cherry src/sys/arch/evbmips/malta/machdep.c 1.46
   2016.12.22.14.47.57 cherry src/sys/arch/evbmips/rasoc/machdep.c 1.13
   2016.12.22.14.47.57 cherry src/sys/arch/evbmips/rmixl/machdep.c 1.18
   2016.12.22.14.47.57 cherry src/sys/arch/evbppc/ev64260/machdep.c 1.32
   2016.12.22.14.47.57 cherry src/sys/arch/evbppc/mpc85xx/machdep.c 1.42
   2016.12.22.14.47.57 cherry src/sys/arch/evbppc/pmppc/machdep.c 1.13
   2016.12.22.14.47.57 cherry src/sys/arch/ews4800mips/ews4800mips/machdep.c 1.27
   2016.12.22.14.47.57 cherry src/sys/arch/hpcarm/hpcarm/pxa2x0_hpc_machdep.c 1.23
   2016.12.22.14.47.57 cherry src/sys/arch/hpcarm/hpcarm/sa11x0_hpc_machdep.c 1.11
   2016.12.22.14.47.57 cherry src/sys/arch/hpcmips/hpcmips/machdep.c 1.121
   2016.12.22.14.47.57 cherry src/sys/arch/hppa/hppa/pmap.c 1.100
   2016.12.22.14.47.58 cherry src/sys/arch/i386/i386/machdep.c 1.771
   2016.12.22.14.47.58 cherry src/sys/arch/ia64/ia64/machdep.c 1.36
   2016.12.22.14.47.58 cherry src/sys/arch/iyonix/iyonix/iyonix_machdep.c 1.25
   2016.12.22.14.47.58 cherry src/sys/arch/m68k/m68k/pmap_motorola.c 1.68
   2016.12.22.14.47.58 cherry src/sys/arch/mipsco/mipsco/machdep.c 1.80
   2016.12.22.14.47.58 cherry src/sys/arch/netwinder/netwinder/netwinder_machdep.c 1.84
   2016.12.22.14.47.58 cherry src/sys/arch/newsmips/newsmips/machdep.c 1.119
   2016.12.22.14.47.58 cherry src/sys/arch/playstation2/playstation2/machdep.c 1.32
   2016.12.22.14.47.58 cherry src/sys/arch/pmax/pmax/machdep.c 1.251
   2016.12.22.14.47.58 cherry src/sys/arch/powerpc/ibm4xx/ibm4xx_machdep.c 1.22
   2016.12.22.14.47.58 cherry src/sys/arch/powerpc/ibm4xx/pmap.c 1.73
   2016.12.22.14.47.58 cherry src/sys/arch/powerpc/oea/ofwoea_machdep.c 1.39
   2016.12.22.14.47.58 cherry src/sys/arch/powerpc/oea/prep_machdep.c 1.11
   2016.12.22.14.47.59 cherry src/sys/arch/rs6000/rs6000/machdep.c 1.11
   2016.12.22.14.47.59 cherry src/sys/arch/sandpoint/sandpoint/machdep.c 1.66
   2016.12.22.14.47.59 cherry src/sys/arch/sbmips/sbmips/machdep.c 1.54
   2016.12.22.14.47.59 cherry src/sys/arch/sgimips/sgimips/machdep.c 1.143
   2016.12.22.14.47.59 cherry src/sys/arch/sh3/sh3/sh3_machdep.c 1.105
   2016.12.22.14.47.59 cherry src/sys/arch/shark/ofw/ofw.c 1.66
   2016.12.22.14.47.59 cherry src/sys/arch/sparc/sparc/pmap.c 1.361
   2016.12.22.14.47.59 cherry src/sys/arch/sparc64/sparc64/pmap.c 1.305
   2016.12.22.14.47.59 cherry src/sys/arch/sun2/sun2/pmap.c 1.48
   2016.12.22.14.47.59 cherry src/sys/arch/sun3/sun3/pmap.c 1.171
   2016.12.22.14.47.59 cherry src/sys/arch/sun3/sun3x/pmap.c 1.114
   2016.12.22.14.47.59 cherry src/sys/arch/usermode/usermode/machdep.c 1.54
   2016.12.22.14.48.00 cherry src/sys/arch/vax/vax/pmap.c 1.183
   2016.12.22.14.48.00 cherry src/sys/arch/zaurus/zaurus/machdep.c 1.38
   2016.12.22.15.54.35 cherry src/sys/uvm/uvm_physseg.h 1.3
 
 -- 
 Andreas Gustafsson, gson%gson.org@localhost
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