Hello, syzbot found the following issue on: HEAD commit: 325d0eab Merge branch 'akpm' (patches from Andrew) git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1671c0e3900000 kernel config: https://syzkaller.appspot.com/x/.config?x=b12e84189082991c dashboard link: https://syzkaller.appspot.com/bug?extid=690cb1e51970435f9775 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15705a3d900000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=117b3281900000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+690cb1e51970435f9775@xxxxxxxxxxxxxxxxxxxxxxxxx REISERFS (device loop0): journal params: device loop0, size 15748, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 REISERFS (device loop0): checking transaction log (loop0) REISERFS (device loop0): Using tea hash to sort names REISERFS (device loop0): using 3.5.x disk format general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f] CPU: 0 PID: 6874 Comm: syz-executor834 Not tainted 5.9.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:d_really_is_negative include/linux/dcache.h:472 [inline] RIP: 0010:reiserfs_xattr_jcreate_nblocks fs/reiserfs/xattr.h:78 [inline] RIP: 0010:reiserfs_security_init+0x285/0x4d0 fs/reiserfs/xattr_security.c:70 Code: 48 c1 ea 03 80 3c 02 00 0f 85 2b 02 00 00 4d 8b ad a0 05 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d 7d 68 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 23 02 00 00 49 83 7d 68 00 0f 84 62 01 00 00 48 RSP: 0018:ffffc90005827980 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000036 RCX: 000000000000006c RDX: 000000000000000d RSI: ffffffff82009dd3 RDI: 0000000000000068 RBP: ffff88807d8441d0 R08: ffffc90005827a10 R09: ffffc90005827a18 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000005fa R13: 0000000000000000 R14: ffff888094e60000 R15: 0000000000000000 FS: 0000000001036880(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5a6fb90ab4 CR3: 000000009a1ab000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: reiserfs_mkdir+0x2c9/0x980 fs/reiserfs/namei.c:821 create_privroot fs/reiserfs/xattr.c:882 [inline] reiserfs_xattr_init+0x4de/0xb52 fs/reiserfs/xattr.c:1004 reiserfs_fill_super+0x215d/0x2df3 fs/reiserfs/super.c:2177 mount_bdev+0x32e/0x3f0 fs/super.c:1417 legacy_get_tree+0x105/0x220 fs/fs_context.c:592 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2875 [inline] path_mount+0x1387/0x20a0 fs/namespace.c:3192 do_mount fs/namespace.c:3205 [inline] __do_sys_mount fs/namespace.c:3413 [inline] __se_sys_mount fs/namespace.c:3390 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3390 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x447d9a Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 7d a3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 5a a3 fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007fffe558f5c8 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fffe558f620 RCX: 0000000000447d9a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fffe558f5e0 RBP: 00007fffe558f5e0 R08: 00007fffe558f620 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000006 R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 Modules linked in: ---[ end trace e6a0a9f4ee2cea86 ]--- RIP: 0010:d_really_is_negative include/linux/dcache.h:472 [inline] RIP: 0010:reiserfs_xattr_jcreate_nblocks fs/reiserfs/xattr.h:78 [inline] RIP: 0010:reiserfs_security_init+0x285/0x4d0 fs/reiserfs/xattr_security.c:70 Code: 48 c1 ea 03 80 3c 02 00 0f 85 2b 02 00 00 4d 8b ad a0 05 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d 7d 68 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 23 02 00 00 49 83 7d 68 00 0f 84 62 01 00 00 48 RSP: 0018:ffffc90005827980 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000036 RCX: 000000000000006c RDX: 000000000000000d RSI: ffffffff82009dd3 RDI: 0000000000000068 RBP: ffff88807d8441d0 R08: ffffc90005827a10 R09: ffffc90005827a18 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000005fa R13: 0000000000000000 R14: ffff888094e60000 R15: 0000000000000000 FS: 0000000001036880(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff7d575b000 CR3: 000000009a1ab000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
