Greetings, 0day kernel testing robot got the below dmesg and the first bad commit is https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git mount-context commit f7799478647445b3d902d0476b282a14f10c1fd3 Author: David Howells <dhowells(a)redhat.com&gt; AuthorDate: Mon Jul 17 08:51:45 2017 +0100 Commit: David Howells <dhowells(a)redhat.com&gt; CommitDate: Fri Jul 21 16:06:58 2017 +0100 VFS: Implement a filesystem superblock creation/configuration context Implement a filesystem context concept to be used during superblock creation for mount and superblock reconfiguration for remount. The mounting procedure then becomes: (1) Allocate new fs_context context. (2) Configure the context. (3) Create superblock. (4) Mount the superblock any number of times. (5) Destroy the context. Rather than calling fs_type->mount(), an fs_context struct is created and fs_type->init_fs_context() is called to set it up. fs_type->fs_context_size says how much space should be allocated for the config context. The fs_context struct is placed at the beginning and any extra space is for the filesystem's use. A set of operations has to be set by ->init_fs_context() to provide freeing, duplication, option parsing, binary data parsing, validation, mounting and superblock filling. Legacy filesystems are supported by the provision of a set of legacy fs_context operations that build up a list of mount options and then invoke fs_type->mount() from within the fs_context ->get_tree() operation. This allows all filesystems to be accessed using fs_context. It should be noted that, whilst this patch adds a lot of lines of code, there is quite a bit of duplication with existing code that can be eliminated should all filesystems be converted over. Signed-off-by: David Howells <dhowells(a)redhat.com&gt; 09d303223d VFS: Add LSM hooks for filesystem context f779947864 VFS: Implement a filesystem superblock creation/configuration context +-------------------------------+------------+------------+ | | 09d303223d | f779947864 | +-------------------------------+------------+------------+ | boot_successes | 33 | 0 | | boot_failures | 0 | 13 | | BUG:KASAN:stack-out-of-bounds | 0 | 13 | +-------------------------------+------------+------------+ [ 1.162398] clocksource: Switched to clocksource kvm-clock [ 1.171558] Warning: could not register annotated branches stats [ 1.261727] VFS: Disk quotas dquot_6.6.0 [ 1.262549] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes) [ 1.263923] ================================================================== [ 1.265078] BUG: KASAN: stack-out-of-bounds in legacy_monolithic_mount_data+0xf7/0x120 [ 1.266342] Read of size 4096 at addr ffff88001a09fd98 by task swapper/0/1 [ 1.267449] [ 1.267726] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.13.0-rc1-00011-gf779947 #1 [ 1.268940] Call Trace: [ 1.269359] dump_stack+0x86/0xc3 [ 1.269920] print_address_description+0x7d/0x2d0 [ 1.270030] ? legacy_monolithic_mount_data+0xf7/0x120 [ 1.270030] kasan_report+0x226/0x3a0 [ 1.270030] check_memory_region+0x183/0x190 [ 1.270030] memcpy+0x23/0x50 [ 1.270030] legacy_monolithic_mount_data+0xf7/0x120 [ 1.270030] ? kstrdup+0x47/0x60 [ 1.270030] vfs_kern_mount+0xc7/0x180 [ 1.270030] ? _raw_write_unlock+0x69/0x80 [ 1.270030] kern_mount_data+0x48/0x50 [ 1.270030] init_hugetlbfs_fs+0x1e9/0x3be [ 1.270030] ? init_ramfs_fs+0x27/0x27 [ 1.270030] ? proc_create_data+0x13b/0x160 [ 1.270030] ? init_ramfs_fs+0x27/0x27 [ 1.270030] do_one_initcall+0x117/0x22d [ 1.270030] ? start_kernel+0x5e2/0x5e2 [ 1.270030] ? preempt_count_sub+0x225/0x250 [ 1.270030] ? _raw_spin_unlock_irqrestore+0x91/0xa0 [ 1.270030] kernel_init_freeable+0x2b1/0x35a [ 1.270030] ? rest_init+0x260/0x260 [ 1.270030] kernel_init+0x13/0x120 [ 1.270030] ? rest_init+0x260/0x260 [ 1.270030] ret_from_fork+0x2a/0x40 [ 1.270030] [ 1.270030] The buggy address belongs to the page: [ 1.270030] page:ffffea00006827c0 count:0 mapcount:0 mapping: (null) index:0x0 [ 1.270030] flags: 0x0() [ 1.270030] raw: 0000000000000000 0000000000000000 0000000000000000 00000000ffffffff # HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD git bisect start 63897d0a68483a4d1e8658e0302592b0051b61cc 520eccdfe187591a51ea9ab4c1a024ae4d0f68d9 -- git bisect bad 28f0ec69b89219b1446f5db1391575c58346b662 # 00:58 B 0 11 23 0 Merge 'asoc/fix/sh' into devel-spot-201707282357 git bisect bad 23210f2c3679dd72fb18dc55b30f7694471cdba9 # 01:10 B 0 7 19 0 Merge 'djwong-xfs/djwong-wtf' into devel-spot-201707282357 git bisect bad b27d71a5148dd96df973a61863ffedb7c9504568 # 01:19 B 0 8 20 0 Merge 'wq/for-next' into devel-spot-201707282357 git bisect bad b71ef7bb5dcab3f05ca69eb74fb9a83985c5c32e # 01:35 B 0 11 24 1 Merge 'gfs2/for-next' into devel-spot-201707282357 git bisect good 84c5650d287f764b8e98d526c93ad5a26265e2d2 # 01:46 G 11 0 0 0 0day base guard for 'devel-spot-201707282357' git bisect bad 2f4ef6b81a73c6c65f1d8f1ee2f3dd89685ceba8 # 01:55 B 0 11 23 0 Merge 'dhowells-fs/mount-context' into devel-spot-201707282357 git bisect bad c63bd789b3d6cdbbc9bea26e4903ac0fc2885ac7 # 02:04 B 0 11 23 0 VFS: Add a sample program for fsopen/fsmount git bisect good c9193f84c3731206304fe07bc840269ebbb3f23b # 02:17 G 11 0 0 0 VFS: Introduce the structs and doc for a filesystem context git bisect bad 26d3efc34a54b7e5b4a2e9b8cd7c25a6159c5c12 # 02:27 B 0 11 23 0 VFS: Remove unused code after filesystem context changes git bisect bad f7799478647445b3d902d0476b282a14f10c1fd3 # 02:39 B 0 11 23 0 VFS: Implement a filesystem superblock creation/configuration context git bisect good 09d303223d13143545fca35b48aa47cd9fc20989 # 02:58 G 11 0 0 0 VFS: Add LSM hooks for filesystem context # first bad commit: [f7799478647445b3d902d0476b282a14f10c1fd3] VFS: Implement a filesystem superblock creation/configuration context git bisect good 09d303223d13143545fca35b48aa47cd9fc20989 # 03:01 G 31 0 0 0 VFS: Add LSM hooks for filesystem context # extra tests with CONFIG_DEBUG_INFO_REDUCED git bisect bad f7799478647445b3d902d0476b282a14f10c1fd3 # 03:11 B 0 11 23 0 VFS: Implement a filesystem superblock creation/configuration context # extra tests on HEAD of linux-devel/devel-spot-201707282357 git bisect bad 63897d0a68483a4d1e8658e0302592b0051b61cc # 03:11 B 0 23 38 0 0day head guard for 'devel-spot-201707282357' # extra tests on tree/branch dhowells-fs/mount-context --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/lkp Intel Corporation