syzbot


kernel BUG at fs/erofs/inode.c:LINE!

Status: closed as invalid on 2020/09/30 07:22
Reported-by: syzbot+8afc256dce324523609d@syzkaller.appspotmail.com
First crash: 731d, last: 728d

Cause bisection: introduced by (bisect log) :
commit 382329a9d8553a98418a6f6e3425f0c288837897
Author: Gao Xiang <gaoxiang25@huawei.com>
Date: Wed Aug 14 10:37:04 2019 +0000

  staging: erofs: differentiate unsupported on-disk format

Crash: kernel BUG at drivers/staging/erofs/inode.c:LINE! (log)
Repro: C syz .config

Sample crash report:
erofs: (device loop0): erofs_read_inode: bogus i_mode (0) @ nid 36
------------[ cut here ]------------
kernel BUG at fs/erofs/inode.c:182!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 6895 Comm: syz-executor894 Not tainted 5.9.0-rc6-next-20200924-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:erofs_read_inode fs/erofs/inode.c:182 [inline]
RIP: 0010:erofs_fill_inode fs/erofs/inode.c:235 [inline]
RIP: 0010:erofs_iget+0xfd8/0x2390 fs/erofs/inode.c:322
Code: 00 0f 85 aa 10 00 00 49 8b 7c 24 28 49 89 d8 44 89 e9 48 c7 c2 a0 9c ef 88 48 c7 c6 40 9f ef 88 e8 b5 df b0 04 e8 88 5a 07 fe <0f> 0b e8 81 5a 07 fe 4c 89 e7 4c 63 e3 e8 b6 61 5b fe e9 ed f0 ff
RSP: 0018:ffffc90001017c10 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000024 RCX: 0000000000000000
RDX: ffff8880a172e480 RSI: ffffffff836dd6e8 RDI: fffff52000202f72
RBP: ffff8880a8ca4480 R08: 0000000000000042 R09: ffff8880ae5319a7
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880854fd9b8
R13: 0000000000000000 R14: ffffea0002a32900 R15: 0000000000000000
FS:  000000000108e880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000043eb80 CR3: 00000000a7edb000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 erofs_fc_fill_super+0xaa3/0x1010 fs/erofs/super.c:382
 get_tree_bdev+0x421/0x740 fs/super.c:1342
 vfs_get_tree+0x89/0x2f0 fs/super.c:1547
 do_new_mount fs/namespace.c:2896 [inline]
 path_mount+0x12ae/0x1e70 fs/namespace.c:3227
 __do_sys_mount fs/namespace.c:3438 [inline]
 __se_sys_mount fs/namespace.c:3411 [inline]
 __x64_sys_mount+0x278/0x2f0 fs/namespace.c:3411
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x446d6a
Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd ad 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 da ad fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007fffa8ef9ef8 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fffa8ef9f50 RCX: 0000000000446d6a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fffa8ef9f10
RBP: 00007fffa8ef9f10 R08: 00007fffa8ef9f50 R09: 00007fff00000015
R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000001
R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003
Modules linked in:
---[ end trace 66a5371a9bd8a3b2 ]---
RIP: 0010:erofs_read_inode fs/erofs/inode.c:182 [inline]
RIP: 0010:erofs_fill_inode fs/erofs/inode.c:235 [inline]
RIP: 0010:erofs_iget+0xfd8/0x2390 fs/erofs/inode.c:322
Code: 00 0f 85 aa 10 00 00 49 8b 7c 24 28 49 89 d8 44 89 e9 48 c7 c2 a0 9c ef 88 48 c7 c6 40 9f ef 88 e8 b5 df b0 04 e8 88 5a 07 fe <0f> 0b e8 81 5a 07 fe 4c 89 e7 4c 63 e3 e8 b6 61 5b fe e9 ed f0 ff
RSP: 0018:ffffc90001017c10 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000024 RCX: 0000000000000000
RDX: ffff8880a172e480 RSI: ffffffff836dd6e8 RDI: fffff52000202f72
RBP: ffff8880a8ca4480 R08: 0000000000000042 R09: ffff8880ae5319a7
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880854fd9b8
R13: 0000000000000000 R14: ffffea0002a32900 R15: 0000000000000000
FS:  000000000108e880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000043eb80 CR3: 00000000a7edb000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (4):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-linux-next-kasan-gce-root 2020/09/25 08:49 linux-next d1d2220c7f39 54289b08 .config log report syz C
ci-upstream-kasan-gce-smack-root 2020/09/27 11:08 upstream eeddbe6841cd 5dd8aee8 .config log report info
ci-upstream-kasan-gce-smack-root 2020/09/24 01:28 upstream 805c6d3c1921 287cd75a .config log report info
ci-upstream-linux-next-kasan-gce-root 2020/09/25 08:34 linux-next d1d2220c7f39 54289b08 .config log report info
* Struck through repros no longer work on HEAD.