Greetings, 0day kernel testing robot got the below dmesg and the first bad commit is kemi/lock_page/before_tim commit 741b3aefca11b8fd1f32fdebcbea82814ad2b923 Author: Kemi Wang <kemi.wang(a)intel.com&gt; AuthorDate: Wed Aug 29 15:21:26 2018 +0800 Commit: Kemi Wang <kemi.wang(a)intel.com&gt; CommitDate: Wed Aug 29 17:49:18 2018 +0800 try double lock Signed-off-by: Kemi Wang <kemi.wang(a)intel.com&gt; 46c1e79fee Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 741b3aefca try double lock +-------------------------------+------------+------------+ | | 46c1e79fee | 741b3aefca | +-------------------------------+------------+------------+ | boot_successes | 56 | 14 | | boot_failures | 0 | 12 | | BUG:spinlock_bad_magic_on_CPU | 0 | 12 | | RIP:__clear_user | 0 | 5 | +-------------------------------+------------+------------+ mountall: Event failed [ 9.180387] init: Failed to create pty - disabling logging for job [ 9.181328] init: Temporary process spawn error: No such file or directory [ 9.192313] init: Failed to create pty - disabling logging for job [ 9.193259] init: Temporary process spawn error: No such file or directory [ 9.205159] BUG: spinlock bad magic on CPU#1, df/179 [ 9.206205] lock: page_wait_table+0x1448/0xa000, .magic: 00000000, .owner: df/179, .owner_cpu: 1 [ 9.207990] CPU: 1 PID: 179 Comm: df Not tainted 4.13.0-11812-g741b3ae #1 [ 9.209342] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 [ 9.211003] Call Trace: [ 9.211511] dump_stack+0x79/0x95 [ 9.212194] spin_bug+0x9d/0xa3 [ 9.212842] do_raw_spin_unlock+0x22/0x81 [ 9.213655] _raw_spin_unlock_irq+0x27/0x36 [ 9.214513] wait_on_page_bit_common+0xde/0x163 [ 9.215440] __add_to_page_cache_locked+0x138/0x138 [ 9.216459] wait_on_page_bit_killable+0x3e/0x40 [ 9.217397] wait_on_page_locked_killable+0x27/0x2e [ 9.218384] __lock_page_or_retry+0x41/0x87 [ 9.219242] filemap_fault+0x1d8/0x360 [ 9.220011] __do_fault+0x1b/0x6b [ 9.220686] __handle_mm_fault+0x544/0x91e [ 9.221519] handle_mm_fault+0xe9/0xef [ 9.222290] __do_page_fault+0x26a/0x357 [ 9.223092] do_page_fault+0x141/0x14a [ 9.223860] do_async_page_fault+0x31/0x59 [ 9.224685] async_page_fault+0x1f/0x30 [ 9.225468] RIP: 0010:__clear_user+0x3f/0x61 [ 9.226333] RSP: 0018:ffffc9000020fd40 EFLAGS: 00010206 [ 9.227389] RAX: 0000000000000000 RBX: 00000000000001f9 RCX: 00000000000001f9 [ 9.228809] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00007fe6be425038 [ 9.230223] RBP: ffffc9000020fd50 R08: 00000000be162c32 R09: 0000000000000000 [ 9.231652] R10: ffff88001f36b000 R11: 0000000000000000 R12: 00007fe6be425038 [ 9.233079] R13: 00007fe6be201000 R14: 0000000000001758 R15: ffff88001727ff88 [ 9.234507] clear_user+0x42/0x45 [ 9.235195] padzero+0x20/0x35 [ 9.235830] load_elf_binary+0xaaa/0xe9a [ 9.236626] search_binary_handler+0x5b/0xd3 [ 9.237488] do_execveat_common+0x4ae/0x682 [ 9.238485] do_execve+0x23/0x25 [ 9.239159] SyS_execve+0x2a/0x2e [ 9.239843] do_syscall_64+0x62/0x75 [ 9.240569] entry_SYSCALL64_slow_path+0x25/0x25 [ 9.241504] RIP: 0033:0x7fdbddf44427 [ 9.242235] RSP: 002b:00007ffe67966368 EFLAGS: 00000202 ORIG_RAX: 000000000000003b [ 9.243760] RAX: ffffffffffffffda RBX: 0000000001b46aa8 RCX: 00007fdbddf44427 [ 9.245184] RDX: 0000000001b44008 RSI: 0000000001b49308 RDI: 0000000001b46aa8 [ 9.246609] RBP: 0000000001b49308 R08: 00007ffe67966320 R09: 0000000000000000 [ 9.248035] R10: 00007ffe67966100 R11: 0000000000000202 R12: 0000000000000000 [ 9.249452] R13: 0000000000000004 R14: 0000000001b44008 R15: 00000000ffffffff [ 9.259049] init: Failed to create pty - disabling logging for job [ 9.260477] init: Temporary process spawn error: No such file or directory [ 9.262978] init: Failed to create pty - disabling logging for job # HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD git bisect start c64aaf51ab2469d4f69148c57516b9edd54ff779 5b394b2ddf0347bef56e50c69a58773c94343ff3 -- git bisect good c7da8a0894a6142d9162ffb2add7d45c23d70424 # 15:52 G 18 0 0 0 Merge 'slave-dma/next' into devel-catchup-201808300902 git bisect bad b69923efcc0d26d767ff77dd1e05127e77c2f167 # 16:12 B 5 4 3 3 Merge 'jlayton/locks-execve' into devel-catchup-201808300902 git bisect bad 8720e4c13154e3cd9a2d2ceb1cb011999a8b36ae # 16:26 B 0 2 16 0 Merge 'linux-review/Baolin-Wang/iio-adc-sc27xx-Add-raw-data-support/20180830-064110' into devel-catchup-201808300902 git bisect good ddce51703d017aa76a852f813233b9a399f4e657 # 16:39 G 18 0 0 0 Merge 'peterz-queue/master' into devel-catchup-201808300902 git bisect bad a6a294176c192267fe84136126c850adaab46ab7 # 16:50 B 4 3 4 4 Merge 'kemi/lock_page/before_tim' into devel-catchup-201808300902 git bisect bad 741b3aefca11b8fd1f32fdebcbea82814ad2b923 # 17:01 B 5 7 4 4 try double lock # first bad commit: [741b3aefca11b8fd1f32fdebcbea82814ad2b923] try double lock git bisect good 46c1e79fee417f151547aa46fae04ab06cb666f4 # 17:12 G 56 0 0 0 Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip # extra tests with debug options git bisect bad 741b3aefca11b8fd1f32fdebcbea82814ad2b923 # 17:23 B 6 7 6 6 try double lock # extra tests on HEAD of linux-devel/devel-catchup-201808300902 git bisect bad c64aaf51ab2469d4f69148c57516b9edd54ff779 # 17:23 B 3 8 0 8 0day head guard for 'devel-catchup-201808300902' # extra tests on tree/branch kemi/lock_page/before_tim git bisect bad 741b3aefca11b8fd1f32fdebcbea82814ad2b923 # 17:37 B 7 7 0 5 try double lock # extra tests with first bad commit reverted git bisect good dc282ec7f8be78a4f4761d8f9c7eb33b6a6b05f1 # 17:51 G 18 0 0 0 Revert "try double lock" --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/lkp Intel Corporation