在2024年8月6日八月 下午12:09，Guenter Roeck写道： > Hi, > > On Wed, Jun 12, 2024 at 09:54:29AM +0100, Jiaxun Yang wrote: >> CP0 counter suffers from various problems like SMP sync, >> behaviour on wait. >> >> Set CLOCK_SOURCE_MUST_VERIFY and CLOCK_SOURCE_VERIFY_PERCPU, >> as what x86 did to TSC, to let kernel test it before use. >> >> Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> Hi Guenter, Thanks for the report, it makes no sense to me though.... I can't reproduce it with QEMU git master, do you mind specifying your QEMU version for me? Also is it possible to have a copy of dmesg when failure happens. If I'm unable to resolve it in a couple of days, I'll send a patch to revert this change. Thanks > > With this patch in the mainline kernel, about one in five qemu > boot attempts with e1000 Ethernet controller fail to activate > the network interface (specifically, the dhcp client is unable to > get an IP address for the interface). Bisect log is attached below. > > For reference, here is an example command line. > > qemu-system-mips64 -kernel vmlinux -M malta -cpu 5KEc \ > -initrd rootfs-n32.cpio \ > -device e1000,netdev=net0 -netdev user,id=net0 \ > -vga cirrus -no-reboot -m 256 \ > --append "rdinit=/sbin/init mem=256M console=ttyS0 console=tty " \ > -nographic > > Reverting this patch fixes the probem. > > Thanks, > Guenter > > --- > # bad: [de9c2c66ad8e787abec7c9d7eff4f8c3cdd28aed] Linux 6.11-rc2 > # good: [0c3836482481200ead7b416ca80c68a29cfdaabd] Linux 6.10 > git bisect start 'HEAD' 'v6.10' > # good: [280e36f0d5b997173d014c07484c03a7f7750668] nsfs: use cleanup > guard > git bisect good 280e36f0d5b997173d014c07484c03a7f7750668 > # good: [a4f9285520584977127946a22eab2adfbc87d1bf] Merge tag > 'clk-for-linus' of > git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux > git bisect good a4f9285520584977127946a22eab2adfbc87d1bf > # bad: [8e313211f7d46d42b6aa7601b972fe89dcc4a076] Merge tag > 'pinctrl-v6.11-1' of > git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl > git bisect bad 8e313211f7d46d42b6aa7601b972fe89dcc4a076 > # good: [acc5965b9ff8a1889f5b51466562896d59c6e1b9] Merge tag > 'char-misc-6.11-rc1' of > git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc > git bisect good acc5965b9ff8a1889f5b51466562896d59c6e1b9 > # bad: [d2be38b9a5514dbc7dc0c96a2a7f619fcddce00d] Merge tag 'mips_6.11' > of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux > git bisect bad d2be38b9a5514dbc7dc0c96a2a7f619fcddce00d > # good: [45659274e60864f9acabba844468e405362bdc8c] Merge branch > 'pci/misc' > git bisect good 45659274e60864f9acabba844468e405362bdc8c > # good: [8e5c0abfa02d85b9cd2419567ad2d73ed8fe4b74] Merge tag > 'input-for-v6.11-rc0' of > git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input > git bisect good 8e5c0abfa02d85b9cd2419567ad2d73ed8fe4b74 > # good: [3c3ff7be9729959699eb6cbc7fd7303566d74069] Merge tag > 'powerpc-6.11-1' of > git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux > git bisect good 3c3ff7be9729959699eb6cbc7fd7303566d74069 > # good: [3de96d810ffd712b7ad2bd764c1390fac2436551] dt-bindings: mips: > brcm: Document brcm,bmips-cbr-reg property > git bisect good 3de96d810ffd712b7ad2bd764c1390fac2436551 > # bad: [9c7a86c935074525f24cc20e78a7d5150e4600e3] MIPS: lantiq: improve > USB initialization > git bisect bad 9c7a86c935074525f24cc20e78a7d5150e4600e3 > # bad: [580724fce27f2b71b3e4d58bbe6d83b671929b33] MIPS: sync-r4k: > Rework based on x86 tsc_sync > git bisect bad 580724fce27f2b71b3e4d58bbe6d83b671929b33 > # good: [c171186c177970d3ec22dd814f2693f1f7fc1e7d] MIPS: csrc-r4k: > Refine rating computation > git bisect good c171186c177970d3ec22dd814f2693f1f7fc1e7d > # bad: [426fa8e4fe7bb914b5977cbce453a9926bf5b2e6] MIPS: csrc-r4k: > Select HAVE_UNSTABLE_SCHED_CLOCK if SMP && 64BIT > git bisect bad 426fa8e4fe7bb914b5977cbce453a9926bf5b2e6 > # bad: [7190401fc56fb5f02ee3d04476778ab000bbaf32] MIPS: csrc-r4k: Apply > verification clocksource flags > git bisect bad 7190401fc56fb5f02ee3d04476778ab000bbaf32 > # first bad commit: [7190401fc56fb5f02ee3d04476778ab000bbaf32] MIPS: > csrc-r4k: Apply verification clocksource flags -- - Jiaxun
