bisecting fixing commit since 030194a5b292bb7613407668d85af0b987bb9839 building syzkaller on 4a003785c5484e99127a20e069a5edddcb8c24d5 testing commit 030194a5b292bb7613407668d85af0b987bb9839 with gcc (GCC) 8.4.1 20210217 kernel signature: a37a8cef303b7f73ba3f01c4a121324ea4049b829a3126560bb1fc8e63f43f7b run #0: crashed: KASAN: out-of-bounds Read in search_by_entry_key run #1: crashed: KASAN: use-after-free Read in search_by_entry_key run #2: crashed: KASAN: use-after-free Read in search_by_entry_key run #3: crashed: KASAN: use-after-free Read in search_by_entry_key run #4: crashed: KASAN: use-after-free Read in search_by_entry_key run #5: crashed: KASAN: use-after-free Read in search_by_entry_key run #6: crashed: KASAN: use-after-free Read in search_by_entry_key run #7: crashed: KASAN: use-after-free Read in search_by_entry_key run #8: crashed: KASAN: use-after-free Read in search_by_entry_key run #9: crashed: KASAN: use-after-free Read in search_by_entry_key run #10: crashed: KASAN: use-after-free Read in search_by_entry_key run #11: crashed: KASAN: use-after-free Read in search_by_entry_key run #12: crashed: KASAN: use-after-free Read in search_by_entry_key run #13: crashed: KASAN: use-after-free Read in search_by_entry_key run #14: crashed: KASAN: use-after-free Read in search_by_entry_key run #15: crashed: KASAN: use-after-free Read in search_by_entry_key run #16: crashed: KASAN: use-after-free Read in search_by_entry_key run #17: crashed: KASAN: use-after-free Read in search_by_entry_key run #18: crashed: KASAN: use-after-free Read in search_by_entry_key run #19: crashed: KASAN: use-after-free Read in search_by_entry_key testing current HEAD 830a059cbba6832c11fefc0894c7ec7a27f75734 testing commit 830a059cbba6832c11fefc0894c7ec7a27f75734 with gcc (GCC) 8.4.1 20210217 kernel signature: 2f0457470a899163aa7b4fe10deb26e821c1bef120675fc5717cc760f8d8f8ca all runs: crashed: KASAN: use-after-free Read in search_by_entry_key revisions tested: 2, total time: 23m26.88460126s (build: 16m34.018879181s, test: 6m31.275695025s) the crash still happens on HEAD commit msg: Linux 4.19.186 crash: KASAN: use-after-free Read in search_by_entry_key reiserfs: using flush barriers REISERFS (device loop1): Using rupasov hash to sort names REISERFS (device loop3): journal params: device loop3, size 15748, journal first block 18, max trans len 1024, max batch 900, max commit age 0, max trans age 30 ================================================================== REISERFS (device loop2): Using rupasov hash to sort names BUG: KASAN: use-after-free in bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline] BUG: KASAN: use-after-free in search_by_entry_key+0xbf9/0xf30 fs/reiserfs/namei.c:164 Read of size 4 at addr ffff888080935004 by task syz-executor.1/9696 CPU: 1 PID: 9696 Comm: syz-executor.1 Not tainted 4.19.186-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 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:443 bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline] search_by_entry_key+0xbf9/0xf30 fs/reiserfs/namei.c:164 reiserfs_find_entry.part.5+0x15a/0x17f0 fs/reiserfs/namei.c:321 reiserfs_find_entry fs/reiserfs/namei.c:367 [inline] reiserfs_lookup+0x216/0x420 fs/reiserfs/namei.c:367 __lookup_slow+0x20d/0x3f0 fs/namei.c:1672 lookup_one_len+0x132/0x160 fs/namei.c:2544 reiserfs_lookup_privroot+0x94/0x270 fs/reiserfs/xattr.c:970 reiserfs_fill_super+0x1139/0x26b0 fs/reiserfs/super.c:2197 mount_bdev+0x26f/0x330 fs/super.c:1158 get_super_block+0x10/0x20 fs/reiserfs/super.c:2609 REISERFS (device loop3): checking transaction log (loop3) 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 REISERFS (device loop3): Using rupasov hash to sort names 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: 0033:0x46748a 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:00007f5eed6d4fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000040 RCX: 000000000046748a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f5eed6d5000 RBP: 00007f5eed6d5040 R08: 00007f5eed6d5040 R09: 0000000020000000 R10: 0000000000208403 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f5eed6d5000 R15: 0000000020011500 The buggy address belongs to the page: page:ffffea0002024d40 count:0 mapcount:0 mapping:0000000000000000 index:0x1 flags: 0xfff00000000000() raw: 00fff00000000000 ffffea0002024d88 ffff8880ba32ea08 0000000000000000 raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888080934f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 ffff888080934f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888080935000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888080935080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888080935100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready