linux-kernel - Re: [syzbot] [ocfs2?] kernel BUG in ocfs2

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Message-ID: <000000000000108fea061fc8ab6d@google.com>
Date: Fri, 16 Aug 2024 01:23:04 -0700
From: syzbot <syzbot+5bdd4953bc58c8fbd6eb@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, lizhi.xu@...driver.com, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ocfs2?] kernel BUG in ocfs2_iget

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in ocfs2_iget

(syz.0.15,5573,0):ocfs2_read_locked_inode:536 ERROR: bug expression: !!(fe->i_flags & cpu_to_le32(OCFS2_SYSTEM_FL)) != !!(args->fi_flags & OCFS2_FI_FLAG_SYSFILE)
(syz.0.15,5573,0):ocfs2_read_locked_inode:536 ERROR: Inode 17: system file state is ambiguous
------------[ cut here ]------------
kernel BUG at fs/ocfs2/inode.c:536!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5573 Comm: syz.0.15 Not tainted 6.11.0-rc3-syzkaller-00156-gd7a5aa4b3c00 #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:ocfs2_read_locked_inode fs/ocfs2/inode.c:533 [inline]
RIP: 0010:ocfs2_iget+0x202b/0x2120 fs/ocfs2/inode.c:159
Code: 00 e8 b9 84 75 fe 4c 8b 84 24 c0 01 00 00 4c 89 f7 48 c7 c6 78 bf 0b 8e ba 18 02 00 00 48 c7 c1 00 00 49 8c e8 16 c9 16 00 90 <0f> 0b e8 ee 3d 0e fe 90 0f 0b e8 e6 3d 0e fe 31 db 65 ff 0d 35 8a
RSP: 0018:ffffc9000280efe0 EFLAGS: 00010246
RAX: 0dfa14ca5ec41c00 RBX: ffffc9000280f140 RCX: 0dfa14ca5ec41c00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000280f270 R08: ffffffff817402fc R09: 1ffff92000501d70
R10: dffffc0000000000 R11: fffff52000501d71 R12: ffff88804cc18200
R13: dffffc0000000000 R14: ffffc9000280f160 R15: 1000000000000000
FS:  00007ff56b8ba6c0(0000) GS:ffff888020800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f99dd1b4ba8 CR3: 000000003671e000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ocfs2_init_global_system_inodes+0xc6/0x730 fs/ocfs2/super.c:437
 ocfs2_initialize_super fs/ocfs2/super.c:2250 [inline]
 ocfs2_fill_super+0x3068/0x5880 fs/ocfs2/super.c:994
 mount_bdev+0x20a/0x2d0 fs/super.c:1679
 legacy_get_tree+0xee/0x190 fs/fs_context.c:662
 vfs_get_tree+0x90/0x2a0 fs/super.c:1800
 do_new_mount+0x2be/0xb40 fs/namespace.c:3472
 do_mount fs/namespace.c:3812 [inline]
 __do_sys_mount fs/namespace.c:4020 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3997
 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: 0033:0x7ff56ab7b0ba
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 7e 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:00007ff56b8b9e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ff56b8b9ef0 RCX: 00007ff56ab7b0ba
RDX: 0000000020004480 RSI: 00000000200044c0 RDI: 00007ff56b8b9eb0
RBP: 0000000020004480 R08: 00007ff56b8b9ef0 R09: 0000000002800400
R10: 0000000002800400 R11: 0000000000000246 R12: 00000000200044c0
R13: 00007ff56b8b9eb0 R14: 0000000000004481 R15: 00000000200001c0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_read_locked_inode fs/ocfs2/inode.c:533 [inline]
RIP: 0010:ocfs2_iget+0x202b/0x2120 fs/ocfs2/inode.c:159
Code: 00 e8 b9 84 75 fe 4c 8b 84 24 c0 01 00 00 4c 89 f7 48 c7 c6 78 bf 0b 8e ba 18 02 00 00 48 c7 c1 00 00 49 8c e8 16 c9 16 00 90 <0f> 0b e8 ee 3d 0e fe 90 0f 0b e8 e6 3d 0e fe 31 db 65 ff 0d 35 8a
RSP: 0018:ffffc9000280efe0 EFLAGS: 00010246
RAX: 0dfa14ca5ec41c00 RBX: ffffc9000280f140 RCX: 0dfa14ca5ec41c00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000280f270 R08: ffffffff817402fc R09: 1ffff92000501d70
R10: dffffc0000000000 R11: fffff52000501d71 R12: ffff88804cc18200
R13: dffffc0000000000 R14: ffffc9000280f160 R15: 1000000000000000
FS:  00007ff56b8ba6c0(0000) GS:ffff888020800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005616292ca000 CR3: 000000003671e000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


Tested on:

commit:         d7a5aa4b Merge tag 'perf-tools-fixes-for-v6.11-2024-08..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15510ad5980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7229118d88b4a71b
dashboard link: https://syzkaller.appspot.com/bug?extid=5bdd4953bc58c8fbd6eb
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.