On Mon, Feb 10, 2020 at 4:22 PM Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> wrote: > > On 2020/02/11 0:06, Dmitry Vyukov wrote: > >> On Mon, Feb 10, 2020 at 4:03 PM Tetsuo Handa > >> <penguin-kernel@xxxxxxxxxxxxxxxxxxx> wrote: > >>> > >>> On 2020/02/10 21:46, Tetsuo Handa wrote: > >>>> On 2020/02/10 19:09, Dmitry Vyukov wrote: > >>>>> You may also try on the exact commit the bug was reported, because > >>>>> usb-fuzzer is tracking branch, things may change there. > >>>> > >>>> OK. I explicitly tried > >>>> > >>>> #syz test: https://github.com/google/kasan.git e5cd56e94edde38ca4dafae5a450c5a16b8a5f23 > >>>> > >>>> but syzbot still cannot reproduce this bug using the reproducer... > >>> > >>> It seems that there is non-trivial difference between kernel config in dashboard > >>> and kernel config in "syz test:" mails. Maybe that's the cause... > > > > > > syzkaller runs oldconfig when building any kernels: > > https://github.com/google/syzkaller/blob/master/pkg/build/linux.go#L56 > > Is that difference what oldconfig produces? > > > > Here is the diff (with "#" lines excluded) between dashboard and "syz test:" mails. > I feel this difference is bigger than what simple oldconfig would cause. > > $ curl 'https://syzkaller.appspot.com/text?tag=KernelConfig&x=8cff427cc8996115' | sort > dashboard I think you took a wrong config as a base. This 8cff427cc8996115 was only used for crashes without reproducers as far as I see, so it can't be used for patch testing. I would expect the one used for last patch testing is this one: https://syzkaller.appspot.com/text?tag=KernelConfig&x=8847e5384a16f66a associated with this crash: ci2-upstream-usb2019/09/23 13:26https://github.com/google/kasan.git usb-fuzzere0bd8d79d96e88f3 I checked at least CONFIG_DYNAMIC_DEBUG, and it matches what was used for patch testing. So everything seems right to me as far as I see. > $ curl 'https://syzkaller.appspot.com/x/.config?x=c372cdb7140fc162' | sort > syz-test > $ diff -u dashboard syz-test | grep -vF '#' | grep '^[+-]' > --- dashboard 2020-02-11 00:19:14.793977153 +0900 > +++ syz-test 2020-02-11 00:19:15.659977108 +0900 > -CONFIG_BLK_DEV_LOOP_MIN_COUNT=16 > +CONFIG_BLK_DEV_LOOP_MIN_COUNT=8 > -CONFIG_BUG_ON_DATA_CORRUPTION=y > -CONFIG_DEBUG_CREDENTIALS=y > -CONFIG_DEBUG_PER_CPU_MAPS=y > -CONFIG_DEBUG_PLIST=y > -CONFIG_DEBUG_SG=y > -CONFIG_DEBUG_VIRTUAL=y > +CONFIG_DEVMEM=y > +CONFIG_DEVPORT=y > +CONFIG_DMA_OF=y > -CONFIG_DYNAMIC_DEBUG=y > -CONFIG_DYNAMIC_MEMORY_LAYOUT=y > +CONFIG_HID_REDRAGON=y > +CONFIG_IRQCHIP=y > -CONFIG_LSM="lockdown,yama,loadpin,safesetid,integrity,selinux,smack,tomoyo,apparmor" > +CONFIG_LSM="yama,loadpin,safesetid,integrity,selinux,smack,tomoyo,apparmor" > -CONFIG_MAC80211_HWSIM=y > +CONFIG_MAGIC_SYSRQ=y > +CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x1 > +CONFIG_MAGIC_SYSRQ_SERIAL=y > +CONFIG_NET_TC_SKB_EXT=y > +CONFIG_OF=y > +CONFIG_OF_ADDRESS=y > +CONFIG_OF_GPIO=y > +CONFIG_OF_IOMMU=y > +CONFIG_OF_IRQ=y > +CONFIG_OF_KOBJ=y > +CONFIG_OF_MDIO=y > +CONFIG_OF_NET=y > -CONFIG_PGTABLE_LEVELS=5 > +CONFIG_PGTABLE_LEVELS=4 > +CONFIG_PWRSEQ_EMMC=y > +CONFIG_PWRSEQ_SIMPLE=y > +CONFIG_RTLWIFI_DEBUG=y > -CONFIG_SECURITYFS=y > +CONFIG_STRICT_DEVMEM=y > +CONFIG_THERMAL_OF=y > +CONFIG_USB_CHIPIDEA_OF=y > +CONFIG_USB_DWC3_OF_SIMPLE=y > -CONFIG_USB_RAW_GADGET=y > +CONFIG_USB_SNP_UDC_PLAT=y > -CONFIG_VIRTIO_BLK_SCSI=y > -CONFIG_VIRT_WIFI=y > -CONFIG_X86_5LEVEL=y
