Messages in this thread | | | Subject | Re: [x86-tip] strange nr_cpus= boot regression | From | Mike Galbraith <> | Date | Mon, 26 Sep 2016 16:27:11 +0200 |
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On Mon, 2016-09-26 at 15:40 +0200, Borislav Petkov wrote: > On Mon, Sep 26, 2016 at 02:39:53PM +0200, Mike Galbraith wrote: > > On Mon, 2016-09-26 at 14:29 +0200, Mike Galbraith wrote: > > > > > Checkout timers/core, and merge nodeid, and all is well. I'm > > > currently > > > bisecting the result against HEAD.. which will likely be about as > > > useful as the last five bisections, but ya never know. (ok git, > > > finger > > > somebody already [hotplug] and call it a day) > > > > That came out backward, though it shouldn't matter. I checked out > > nodeid, and merged timers/core into it, which works fine. > > Ok, I can confirm the same observation without *any* command line > options diminishing the number of CPUs. I'm booting with halved CPU > numbers. Here's a coarse bisect of the merge commits of tip/master: > > ... > e47f2e50ead9 Merge tag 'configfs-for-4.8-2' of > git://git.infradead.org/users/hch/configfs > d24efa23e93c Merge branch 'x86/apic' > > <--- v4.8-rc7-714-gcdcef608a13d: bad > > cdcef608a13d Merge branch 'linus' > 450df5cb5cad Merge branch 'x86/vdso' > 2f2c2f35ddbf Merge branch 'x86/timers' > 782795482a9e Merge branch 'x86/platform' > 1200484cdb51 Merge branch 'x86/cleanups' > b1591e618894 Merge branch 'x86/boot' > 5b8b44cc2d19 Merge branch 'x86/asm' > > <--- v4.8-rc7-496-g20eefd15d70: bad > > 20eefd15d70f Merge branch 'x86/apic' > > <--- v4.8-rc7-475-gb468c89ee756: OK > > b468c89ee756 Merge branch 'timers/core' > > <--- v4.8-rc7-454-g4be273986460: OK > > 4be273986460 Merge branch 'smp/hotplug' > > <--- v4.8-rc7-405-g1eaa05b665b0: OK > > 1eaa05b665b0 Merge branch 'sched/core' > b820db731394 Merge branch 'ras/core' > 689d1113c7ba Merge branch 'perf/core' > f93add128c73 Merge branch 'mm/pkeys' > f0be67cb6c64 Merge branch 'locking/urgent' > ab5f266b0b55 Merge branch 'locking/core' > c69a1dec2a36 Merge branch 'irq/core' > 87671cd5fb60 Merge branch 'efi/core' > 51e5767069c8 Merge branch 'core/smp' > 85202a2289d2 Merge branch 'core/rcu' > ... >
Arrrg.
20eefd15d70f297c7e193e087ed4103b47c2e312 is the first bad commit git bisect start # good: [bd0c06c62f40fb2c1443729e42956a6e4045e791] Merge remote-tracking branch 'x86-tip/timers/core' into nodeid git bisect good bd0c06c62f40fb2c1443729e42956a6e4045e791 # bad: [a04c42e40060130bb05eecb64df2c1cc8f48ab43] Merge branch 'linus' git bisect bad a04c42e40060130bb05eecb64df2c1cc8f48ab43 # good: [b536fd587044af02183b3c02690431b93154f0fa] timekeeping: Include the correct header for errno definitions git bisect good b536fd587044af02183b3c02690431b93154f0fa # good: [fd74da217df7d4bd25e95411da64e0b92762842e] acpi: Validate processor id when mapping the processor git bisect good fd74da217df7d4bd25e95411da64e0b92762842e # good: [739f1bcd045f473d79358aac94439722d41a2650] Merge branch 'perf/urgent' into perf/core, to pick up fixes git bisect good 739f1bcd045f473d79358aac94439722d41a2650 # good: [1eaa05b665b08cd13235f6f430a5214d8b8a3c87] Merge branch 'sched/core' git bisect good 1eaa05b665b08cd13235f6f430a5214d8b8a3c87 # bad: [2f2c2f35ddbf49372db8056b25c2221161d02e75] Merge branch 'x86/timers' git bisect bad 2f2c2f35ddbf49372db8056b25c2221161d02e75 # good: [71f5443ebb1227c22e8decbcd28a1ea6deaf8257] x86/dumpstack: Fix show_stack() task pointer regression git bisect good 71f5443ebb1227c22e8decbcd28a1ea6deaf8257 # good: [e476d3129100ba18daea2224f38fdd7195118d4b] mips/loongson/smp: Convert to hotplug state machine git bisect good e476d3129100ba18daea2224f38fdd7195118d4b # good: [58cbbee2391ce3876e6eee80a4f2a7f025859c52] x86/platform/mellanox: Introduce support for Mellanox systems platform git bisect good 58cbbee2391ce3876e6eee80a4f2a7f025859c52 # bad: [5b8b44cc2d19500e981f492d3d96f85a7007e4ff] Merge branch 'x86/asm' git bisect bad 5b8b44cc2d19500e981f492d3d96f85a7007e4ff # good: [0bf71e4d02ffec8ab9a6adecca61d3eed74fc99d] Merge branch 'smp/for-block' into smp/hotplug git bisect good 0bf71e4d02ffec8ab9a6adecca61d3eed74fc99d # good: [b468c89ee7568999dfc575da56841694c118164a] Merge branch 'timers/core' git bisect good b468c89ee7568999dfc575da56841694c118164a # bad: [20eefd15d70f297c7e193e087ed4103b47c2e312] Merge branch 'x86/apic' git bisect bad 20eefd15d70f297c7e193e087ed4103b47c2e312 # first bad commit: [20eefd15d70f297c7e193e087ed4103b47c2e312] Merge branch 'x86/apic'
Well, that helped.. not at all.
(headbutts box.. nope not the right tool either, maybe traceprintk;)
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