linux-kernel - Re: [syzbot] [bcachefs?] kernel BUG in vfs_get

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Message-ID: <66f35c1e.050a0220.30ac7d.0001.GAE@google.com>
Date: Tue, 24 Sep 2024 17:41:02 -0700
From: syzbot <syzbot+c0360e8367d6d8d04a66@...kaller.appspotmail.com>
To: eadavis@...com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bcachefs?] kernel BUG in vfs_get_tree

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in vfs_get_tree

bcachefs: bch2_fs_get_tree() error: EPERM
Filesystem bcachefs get_tree() didn't set fc->root, returned 1
------------[ cut here ]------------
kernel BUG at fs/super.c:1810!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5668 Comm: syz.0.15 Not tainted 6.11.0-syzkaller-10547-g684a64bf32b6-dirty #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:vfs_get_tree+0x29f/0x2b0 fs/super.c:1810
Code: 1e 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 14 c4 ec ff 48 8b 33 48 c7 c7 20 d4 18 8c 44 89 e2 e8 92 98 af 09 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 90 90 90 90 90
RSP: 0018:ffffc90002f3fd08 EFLAGS: 00010246
RAX: 000000000000003e RBX: ffffffff8ef5ba40 RCX: 1e1b0d788f0b2200
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffff1100ab23e96 R08: ffffffff81746c8c R09: 1ffff920005e7f3c
R10: dffffc0000000000 R11: fffff520005e7f3d R12: 0000000000000001
R13: dffffc0000000000 R14: ffff88805591f498 R15: ffff88805591f4b0
FS:  00007f6bb22e16c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbe68be1000 CR3: 000000004b5ae000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4055 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6bb157f69a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6bb22e0e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f6bb22e0ef0 RCX: 00007f6bb157f69a
RDX: 0000000020005d80 RSI: 0000000020005dc0 RDI: 00007f6bb22e0eb0
RBP: 0000000020005d80 R08: 00007f6bb22e0ef0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020005dc0
R13: 00007f6bb22e0eb0 R14: 0000000000005dcb R15: 0000000020000240
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vfs_get_tree+0x29f/0x2b0 fs/super.c:1810
Code: 1e 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 14 c4 ec ff 48 8b 33 48 c7 c7 20 d4 18 8c 44 89 e2 e8 92 98 af 09 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 90 90 90 90 90
RSP: 0018:ffffc90002f3fd08 EFLAGS: 00010246
RAX: 000000000000003e RBX: ffffffff8ef5ba40 RCX: 1e1b0d788f0b2200
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 1ffff1100ab23e96 R08: ffffffff81746c8c R09: 1ffff920005e7f3c
R10: dffffc0000000000 R11: fffff520005e7f3d R12: 0000000000000001
R13: dffffc0000000000 R14: ffff88805591f498 R15: ffff88805591f4b0
FS:  00007f6bb22e16c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c00171dff8 CR3: 000000004b5ae000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


Tested on:

commit:         684a64bf Merge tag 'nfs-for-6.12-1' of git://git.linux..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=162dc99f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=bd75e1a00004094f
dashboard link: https://syzkaller.appspot.com/bug?extid=c0360e8367d6d8d04a66
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=12b2dd3b980000