bisecting fixing commit since 811218eceeaa7618652e1b8d11caeff67ab42072 building syzkaller on 14052202e8d8d0bb407512b6861e9085f9171241 testing commit 811218eceeaa7618652e1b8d11caeff67ab42072 with gcc (GCC) 8.4.1 20210217 kernel signature: b66698a85f25930e300d3314401843574b9d831c5c08ef0fb30a6c09a454ae4e all runs: crashed: KASAN: out-of-bounds Read in leaf_paste_entries testing current HEAD 125222814e7b8f84df767d6ab622aff2a6d2f234 testing commit 125222814e7b8f84df767d6ab622aff2a6d2f234 with gcc (GCC) 8.4.1 20210217 kernel signature: 8fa8beda82144851077444462f71ab245ac36ab9c427cc812e7fd517e1c8a300 all runs: crashed: KASAN: out-of-bounds Read in leaf_paste_entries revisions tested: 2, total time: 22m35.080413723s (build: 15m18.485544043s, test: 6m45.305658761s) the crash still happens on HEAD commit msg: Linux 4.19.182 crash: KASAN: out-of-bounds Read in leaf_paste_entries REISERFS (device loop1): journal params: device loop1, size 15748, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30 REISERFS (device loop2): checking transaction log (loop2) REISERFS (device loop1): checking transaction log (loop1) REISERFS (device loop0): 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 ffff888056331fa4 by task syz-executor.0/9891 CPU: 1 PID: 9891 Comm: syz-executor.0 Not tainted 4.19.182-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:2148 reiserfs_add_entry+0x792/0xb50 fs/reiserfs/namei.c:566 REISERFS (device loop1): Using tea hash to sort names 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+0x19ec/0x26b0 fs/reiserfs/super.c:2180 mount_bdev+0x26f/0x330 fs/super.c:1158 get_super_block+0x10/0x20 fs/reiserfs/super.c:2609 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:2469 [inline] do_mount+0x376/0x2710 fs/namespace.c:2799 ksys_mount+0xb1/0xd0 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3026 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:00007fa8ca9d9fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00000000004672ba RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fa8ca9da000 RBP: 00007fa8ca9da040 R08: 00007fa8ca9da040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000100 R14: 00007fa8ca9da000 R15: 00000000200003c0 The buggy address belongs to the page: page:ffffea000158cc40 count:2 mapcount:0 mapping:ffff8880b1ab5a60 index:0x3d97 flags: 0xfff00000001064(referenced|lru|active|private) raw: 00fff00000001064 ffffea000158cb08 ffffea000158ccc8 ffff8880b1ab5a60 raw: 0000000000003d97 ffff88805ca209d8 00000002ffffffff ffff8880b593c980 page dumped because: kasan: bad access detected page->mem_cgroup:ffff8880b593c980 Memory state around the buggy address: REISERFS (device loop5): Using tea hash to sort names ffff888056331e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888056331f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888056331f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888056332000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888056332080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================