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 $ 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
