Hi Alexander, FYI, we find an old bug that's still alive in linux-next. The attached reproduce-* script may help debug the problem. https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master commit 80a9201a5965f4715d5c09790862e0df84ce0614 Author: Alexander Potapenko AuthorDate: Thu Jul 28 15:49:07 2016 -0700 Commit: Linus Torvalds CommitDate: Thu Jul 28 16:07:41 2016 -0700 mm, kasan: switch SLUB to stackdepot, enable memory quarantine for SLUB For KASAN builds: - switch SLUB allocator to using stackdepot instead of storing the allocation/deallocation stacks in the objects; - change the freelist hook so that parts of the freelist can be put into the quarantine. [aryabinin@virtuozzo.com: fixes] Link: http://lkml.kernel.org/r/1468601423-28676-1-git-send-email-aryabinin@virtuozzo.com Link: http://lkml.kernel.org/r/1468347165-41906-3-git-send-email-glider@google.com Signed-off-by: Alexander Potapenko Cc: Andrey Konovalov Cc: Christoph Lameter Cc: Dmitry Vyukov Cc: Steven Rostedt (Red Hat) Cc: Joonsoo Kim Cc: Kostya Serebryany Cc: Andrey Ryabinin Cc: Kuthonuzo Luruo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds c146a2b98e mm, kasan: account for object redzone in SLUB's nearest_obj() 80a9201a59 mm, kasan: switch SLUB to stackdepot, enable memory quarantine for SLUB +--------------------------------------------------------------------------------------+------------+------------+ | | c146a2b98e | 80a9201a59 | +--------------------------------------------------------------------------------------+------------+------------+ | boot_successes | 740 | 48 | | boot_failures | 0 | 142 | | BUG:kernel_reboot-without-warning_in_early-boot_stage,last_printk:Booting_the_kernel | 0 | 131 | | BUG:kernel_in_stage | 0 | 11 | +--------------------------------------------------------------------------------------+------------+------------+ Decompressing Linux... Parsing ELF... done. Booting the kernel. git bisect start v4.8 v4.7 -- git bisect bad e6e7214fbbdab1f90254af68e0927bdb24708d22 # 20:07 0- 1 Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip git bisect bad ba929b6646c5b87c7bb15cd8d3e51617725c983b # 21:11 0- 2 Merge branch 'for-linus-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs git bisect good 5f22004ba9b4cf740773777ea7b74586743f6051 # 22:41 190+ 0 Merge branch 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip git bisect good 124a3d88fa20e1869fc229d7d8c740cc81944264 # 23:01 182+ 0 Disable "frame-address" warning git bisect bad 20d00ee829428ea6aab77fa3acca048a6f57d3bc # 23:35 0- 1 Revert "vfs: add lookup_hash() helper" git bisect good 6039b80eb50a893476fea7d56e86ed2d19290054 # 00:20 183+ 0 Merge tag 'dmaengine-4.8-rc1' of git://git.infradead.org/users/vkoul/slave-dma git bisect bad e55884d2c6ac3ae50e49a1f6fe38601a91181719 # 00:53 0- 3 Merge tag 'vfio-v4.8-rc1' of git://github.com/awilliam/linux-vfio git bisect bad d94ba9e7d8d5c821d0442f13b30b0140c1109c38 # 01:46 0- 2 Merge tag 'pinctrl-v4.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl git bisect bad 1c88e19b0f6a8471ee50d5062721ba30b8fd4ba9 # 01:58 0- 1 Merge branch 'akpm' (patches from Andrew) git bisect good bca6759258dbef378bcf5b872177bcd2259ceb68 # 03:16 181+ 0 mm, vmstat: remove zone and node double accounting by approximating retries git bisect good efdc94907977d2db84b4b00cb9bd98ca011f6819 # 08:58 190+ 0 mm: fix memcg stack accounting for sub-page stacks git bisect good fb399b4854d2159a4d23fbfbd7daaed914fd54fa # 11:50 183+ 0 mm/memblock.c: fix index adjustment error in __next_mem_range_rev() git bisect bad 31a6c1909f51dbe9bf08eb40dc64e3db90cf6f79 # 12:09 0- 2 mm, page_alloc: set alloc_flags only once in slowpath git bisect good c146a2b98eb5898eb0fab15a332257a4102ecae9 # 12:51 180+ 0 mm, kasan: account for object redzone in SLUB's nearest_obj() git bisect bad 87cc271d5e4320d705cfdf59f68d4d037b3511b2 # 13:19 0- 1 lib/stackdepot.c: use __GFP_NOWARN for stack allocations git bisect bad 80a9201a5965f4715d5c09790862e0df84ce0614 # 13:34 0- 1 mm, kasan: switch SLUB to stackdepot, enable memory quarantine for SLUB # first bad commit: [80a9201a5965f4715d5c09790862e0df84ce0614] mm, kasan: switch SLUB to stackdepot, enable memory quarantine for SLUB git bisect good c146a2b98eb5898eb0fab15a332257a4102ecae9 # 15:16 550+ 0 mm, kasan: account for object redzone in SLUB's nearest_obj() # extra tests on HEAD of linux-devel/devel-spot-201702260211 git bisect bad 494b6947f72e0d28eb229387a0dc27e95d79b605 # 15:16 0- 15 0day head guard for 'devel-spot-201702260211' # extra tests on tree/branch linus/master git bisect bad e5d56efc97f8240d0b5d66c03949382b6d7e5570 # 15:28 0- 1 Merge tag 'watchdog-for-linus-v4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging # extra tests on tree/branch linux-next/master git bisect bad ed7b11e565c736828f0b793f596a4ca20efee747 # 15:40 0- 3 Add linux-next specific files for 20170227 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/lkp Intel Corporation