On Thu, Feb 21, 2019 at 11:08:19AM +0100, Marek Szyprowski wrote: > Hi Ming, > > On 2019-02-21 10:57, Ming Lei wrote: > > On Thu, Feb 21, 2019 at 09:42:59AM +0100, Marek Szyprowski wrote: > >> On 2019-02-15 12:13, Ming Lei wrote: > >>> This patch pulls the trigger for multi-page bvecs. > >>> > >>> Reviewed-by: Omar Sandoval <osandov@xxxxxx> > >>> Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx> > >> Since Linux next-20190218 I've observed problems with block layer on one > >> of my test devices (Odroid U3 with EXT4 rootfs on SD card). Bisecting > >> this issue led me to this change. This is also the first linux-next > >> release with this change merged. The issue is fully reproducible and can > >> be observed in the following kernel log: > >> > >> sdhci: Secure Digital Host Controller Interface driver > >> sdhci: Copyright(c) Pierre Ossman > >> s3c-sdhci 12530000.sdhci: clock source 2: mmc_busclk.2 (100000000 Hz) > >> s3c-sdhci 12530000.sdhci: Got CD GPIO > >> mmc0: SDHCI controller on samsung-hsmmc [12530000.sdhci] using ADMA > >> mmc0: new high speed SDHC card at address aaaa > >> mmcblk0: mmc0:aaaa SL16G 14.8 GiB > >> > >> ... > >> > >> EXT4-fs (mmcblk0p2): INFO: recovery required on readonly filesystem > >> EXT4-fs (mmcblk0p2): write access will be enabled during recovery > >> EXT4-fs (mmcblk0p2): recovery complete > >> EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null) > >> VFS: Mounted root (ext4 filesystem) readonly on device 179:2. > >> devtmpfs: mounted > >> Freeing unused kernel memory: 1024K > >> hub 1-3:1.0: USB hub found > >> Run /sbin/init as init process > >> hub 1-3:1.0: 3 ports detected > >> *** stack smashing detected ***: <unknown> terminated > >> Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004 > >> CPU: 1 PID: 1 Comm: init Not tainted 5.0.0-rc6-next-20190218 #1546 > >> Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) > >> [<c01118d0>] (unwind_backtrace) from [<c010d794>] (show_stack+0x10/0x14) > >> [<c010d794>] (show_stack) from [<c09ff8a4>] (dump_stack+0x90/0xc8) > >> [<c09ff8a4>] (dump_stack) from [<c0125944>] (panic+0xfc/0x304) > >> [<c0125944>] (panic) from [<c012bc98>] (do_exit+0xabc/0xc6c) > >> [<c012bc98>] (do_exit) from [<c012c100>] (do_group_exit+0x3c/0xbc) > >> [<c012c100>] (do_group_exit) from [<c0138908>] (get_signal+0x130/0xbf4) > >> [<c0138908>] (get_signal) from [<c010c7a0>] (do_work_pending+0x130/0x618) > >> [<c010c7a0>] (do_work_pending) from [<c0101034>] > >> (slow_work_pending+0xc/0x20) > >> Exception stack(0xe88c3fb0 to 0xe88c3ff8) > >> 3fa0: 00000000 bea7787c 00000005 > >> b6e8d0b8 > >> 3fc0: bea77a18 b6f92010 b6e8d0b8 00000001 b6e8d0c8 00000001 b6e8c000 > >> bea77b60 > >> 3fe0: 00000020 bea77998 ffffffff b6d52368 60000050 ffffffff > >> CPU3: stopping > >> > >> I would like to help debugging and fixing this issue, but I don't really > >> have idea where to start. Here are some more detailed information about > >> my test system: > >> > >> 1. Board: ARM 32bit Samsung Exynos4412-based Odroid U3 (device tree > >> source: arch/arm/boot/dts/exynos4412-odroidu3.dts) > >> > >> 2. Block device: MMC/SDHCI/SDHCI-S3C with SD card > >> (drivers/mmc/host/sdhci-s3c.c driver, sdhci_2 device node in the device > >> tree) > >> > >> 3. Rootfs: Ext4 > >> > >> 4. Kernel config: arch/arm/configs/exynos_defconfig > >> > >> I can gather more logs if needed, just let me which kernel option to > >> enable. Reverting this commit on top of next-20190218 as well as current > >> linux-next (tested with next-20190221) fixes this issue and makes the > >> system bootable again. > > Could you test the patch in following link and see if it can make a difference? > > > > https://marc.info/?l=linux-aio&m=155070355614541&w=2 > > I've tested that patch, but it doesn't make any difference on the test > system. In the log I see no warning added by it. I guess it might be related with memory corruption, could you enable the following debug options and post the dmesg log? CONFIG_DEBUG_STACKOVERFLOW=y CONFIG_KASAN=y Thanks, Ming
