bisecting fixing commit since 811218eceeaa7618652e1b8d11caeff67ab42072 building syzkaller on 14052202e8d8d0bb407512b6861e9085f9171241 testing commit 811218eceeaa7618652e1b8d11caeff67ab42072 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: b3b24996f7f0e595ede11c67df339a89e18272f30997000a96e9992536095552 all runs: crashed: KASAN: out-of-bounds Read in leaf_paste_entries testing current HEAD 6db10b4d5efdc38ff06dfdde28dc5477f754b0bd testing commit 6db10b4d5efdc38ff06dfdde28dc5477f754b0bd compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 39bc79438f57e66bb6a8f8247bce8daf85a62b86974a67610bf842ad44481149 all runs: crashed: KASAN: out-of-bounds Read in leaf_paste_entries revisions tested: 2, total time: 24m6.862216046s (build: 16m44.613580109s, test: 6m56.136361456s) the crash still happens on HEAD commit msg: Linux 4.19.209 crash: KASAN: out-of-bounds Read in leaf_paste_entries reiserfs: using flush barriers REISERFS (device loop4): journal params: device loop4, size 15748, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30 REISERFS (device loop4): checking transaction log (loop4) REISERFS (device loop1): Using tea hash to sort names ================================================================== BUG: KASAN: out-of-bounds in memmove include/linux/string.h:392 [inline] BUG: KASAN: out-of-bounds in leaf_paste_entries+0x3f9/0xa20 fs/reiserfs/lbalance.c:1378 Read of size 18446744073709551584 at addr ffff888059016fa4 by task syz-executor.1/9875 CPU: 1 PID: 9875 Comm: syz-executor.1 Not tainted 4.19.209-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x17c/0x226 lib/dump_stack.c:118 print_address_description.cold.6+0x9/0x211 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:396 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13c/0x1b0 mm/kasan/kasan.c:267 memmove+0x23/0x50 mm/kasan/kasan.c:293 memmove include/linux/string.h:392 [inline] leaf_paste_entries+0x3f9/0xa20 fs/reiserfs/lbalance.c:1378 balance_leaf_finish_node_paste_dirent fs/reiserfs/do_balan.c:1306 [inline] balance_leaf_finish_node_paste.isra.15+0x4b6/0x1300 fs/reiserfs/do_balan.c:1332 balance_leaf_finish_node fs/reiserfs/do_balan.c:1375 [inline] balance_leaf fs/reiserfs/do_balan.c:1463 [inline] do_balance+0x2690/0x6e20 fs/reiserfs/do_balan.c:1899 reiserfs_paste_into_item+0x509/0x630 fs/reiserfs/stree.c:2169 reiserfs_add_entry+0x792/0xb50 fs/reiserfs/namei.c:566 reiserfs_mkdir+0x5a0/0x840 fs/reiserfs/namei.c:858 xattr_mkdir.constprop.6+0x91/0xc0 fs/reiserfs/xattr.c:76 create_privroot fs/reiserfs/xattr.c:880 [inline] reiserfs_xattr_init+0x376/0x9f0 fs/reiserfs/xattr.c:1002 reiserfs_fill_super+0x1a88/0x2790 fs/reiserfs/super.c:2188 mount_bdev+0x26f/0x330 fs/super.c:1158 get_super_block+0x10/0x20 fs/reiserfs/super.c:2617 mount_fs+0x7f/0x2b0 fs/super.c:1261 vfs_kern_mount.part.11+0x58/0x3d0 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2492 [inline] do_mount+0x376/0x2630 fs/namespace.c:2822 ksys_mount+0xb1/0xd0 fs/namespace.c:3038 __do_sys_mount fs/namespace.c:3052 [inline] __se_sys_mount fs/namespace.c:3049 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3049 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4672ba Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff2e2ef0fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00000000004672ba RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ff2e2ef1000 RBP: 00007ff2e2ef1040 R08: 00007ff2e2ef1040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000100 R14: 00007ff2e2ef1000 R15: 00000000200003c0 The buggy address belongs to the page: page:ffffea0001640580 count:2 mapcount:0 mapping:ffff8880ae1b6560 index:0x3d97 flags: 0xfff00000001064(referenced|lru|active|private) raw: 00fff00000001064 ffffea0001640088 ffffea000165d188 ffff8880ae1b6560 raw: 0000000000003d97 ffff88805c4bef18 00000002ffffffff ffff88823b2d4900 page dumped because: kasan: bad access detected page->mem_cgroup:ffff88823b2d4900 Memory state around the buggy address: ffff888059016e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888059016f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888059016f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888059017000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888059017080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================