bisecting fixing commit since 811218eceeaa7618652e1b8d11caeff67ab42072 building syzkaller on 14052202e8d8d0bb407512b6861e9085f9171241 testing commit 811218eceeaa7618652e1b8d11caeff67ab42072 with gcc (GCC) 8.4.1 20210217 kernel signature: 7df2a95903d90706b02c80a16f953a1fab3c1d7a2dee3a9714f860a33c5a0ec8 all runs: crashed: KASAN: out-of-bounds Read in leaf_paste_entries testing current HEAD 2965db2e004cf9c92b87c1f559e9812c0ae878c1 testing commit 2965db2e004cf9c92b87c1f559e9812c0ae878c1 with gcc (GCC) 8.4.1 20210217 kernel signature: 75487150d14dfa0823560155d68781810b0196912ab7b76be45591baddb8d7a5 all runs: crashed: KASAN: out-of-bounds Read in leaf_paste_entries revisions tested: 2, total time: 22m51.226961911s (build: 15m31.260255729s, test: 6m53.05132545s) the crash still happens on HEAD commit msg: Linux 4.19.188 crash: KASAN: out-of-bounds Read in leaf_paste_entries reiserfs: using flush barriers REISERFS (device loop5): journal params: device loop5, size 15748, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30 REISERFS (device loop5): checking transaction log (loop5) 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 ffff888057834fa4 by task syz-executor.0/9948 CPU: 0 PID: 9948 Comm: syz-executor.0 Not tainted 4.19.188-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_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 REISERFS (device loop3): Using tea hash to sort names 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:00007fbbf672cfa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00000000004672ba RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fbbf672d000 RBP: 00007fbbf672d040 R08: 00007fbbf672d040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000100 R14: 00007fbbf672d000 R15: 00000000200003c0 The buggy address belongs to the page: page:ffffea00015e0d00 count:2 mapcount:0 mapping:ffff8880b1b35a20 index:0x3d97 flags: 0xfff00000001064(referenced|lru|active|private) raw: 00fff00000001064 ffffea00015e1f08 ffffea00015e2048 ffff8880b1b35a20 raw: 0000000000003d97 ffff88805c1b1930 00000002ffffffff ffff88823b2d4900 page dumped because: kasan: bad access detected page->mem_cgroup:ffff88823b2d4900 Memory state around the buggy address: ffff888057834e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888057834f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888057834f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888057835000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888057835080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== REISERFS (device loop2): Using tea hash to sort names REISERFS (device loop1): Using tea hash to sort names ------------[ cut here ]------------ WARNING: CPU: 1 PID: 7802 at fs/buffer.c:1976 __block_write_begin_int.cold.23+0x21/0x41 fs/buffer.c:1976