linux-kernel - [syzbot] [ocfs2?] kernel BUG in ocfs2_find_subtree

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Message-ID: <6722a966.050a0220.529b6.0002.GAE@google.com>
Date: Wed, 30 Oct 2024 14:47:18 -0700
From: syzbot <syzbot+c6bd015c32fbb94aa3ec@...kaller.appspotmail.com>
To: jlbec@...lplan.org, joseph.qi@...ux.alibaba.com, 
	linux-kernel@...r.kernel.org, mark@...heh.com, ocfs2-devel@...ts.linux.dev, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [ocfs2?] kernel BUG in ocfs2_find_subtree_root

Hello,

syzbot found the following issue on:

HEAD commit:    ea1fda89f5b2 Merge tag 'x86_urgent_for_v6.12_rc5' of git:/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=135ba940580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7c88a43a2c4a2024
dashboard link: https://syzkaller.appspot.com/bug?extid=c6bd015c32fbb94aa3ec
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-ea1fda89.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c2b219efb942/vmlinux-ea1fda89.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e79d4e9109b5/bzImage-ea1fda89.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c6bd015c32fbb94aa3ec@...kaller.appspotmail.com

Process accounting resumed
(syz.0.0,5323,0):ocfs2_find_subtree_root:1777 ERROR: bug expression: i > left->p_tree_depth
(syz.0.0,5323,0):ocfs2_find_subtree_root:1777 ERROR: Owner 17059, left depth 1, right depth 1
left leaf blk 10739, right leaf blk 10739
------------[ cut here ]------------
kernel BUG at fs/ocfs2/alloc.c:1777!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted 6.12.0-rc4-syzkaller-00289-gea1fda89f5b2 #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_find_subtree_root+0x5ab/0x5c0 fs/ocfs2/alloc.c:1771
Code: 68 ea 11 8e ba f1 06 00 00 48 c7 c1 40 10 49 8c 4c 8b 44 24 20 45 89 f1 ff 33 41 57 ff 74 24 28 e8 6a 0d 22 00 48 83 c4 18 90 <0f> 0b e8 8e 17 13 fe 90 0f 0b e8 a6 25 45 08 66 0f 1f 44 00 00 90
RSP: 0018:ffffc9000d1bdfa0 EFLAGS: 00010296
RAX: 1bb296cac2b5b100 RBX: ffff888043f97018 RCX: 1bb296cac2b5b100
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000d1be090 R08: ffffffff81749fac R09: 1ffff92001a37b60
R10: dffffc0000000000 R11: fffff52001a37b61 R12: 0000000000000001
R13: 0000000000000010 R14: 0000000000000001 R15: 00000000000029f3
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffbb527fc00 CR3: 00000000432aa000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ocfs2_insert_path+0xad7/0x12c0 fs/ocfs2/alloc.c:4232
 ocfs2_do_insert_extent+0xae1/0x10d0 fs/ocfs2/alloc.c:4334
 ocfs2_insert_extent+0x1377/0x2270 fs/ocfs2/alloc.c:4757
 ocfs2_add_clusters_in_btree+0x741/0x1370 fs/ocfs2/alloc.c:4849
 ocfs2_add_inode_data+0xcf/0x120 fs/ocfs2/file.c:550
 ocfs2_write_cluster fs/ocfs2/aops.c:1134 [inline]
 ocfs2_write_cluster_by_desc+0x54c/0x20b0 fs/ocfs2/aops.c:1239
 ocfs2_write_begin_nolock+0x3a2f/0x4ec0 fs/ocfs2/aops.c:1815
 ocfs2_write_begin+0x205/0x3a0 fs/ocfs2/aops.c:1902
 generic_perform_write+0x344/0x6d0 mm/filemap.c:4054
 ocfs2_file_write_iter+0x17b1/0x1f50 fs/ocfs2/file.c:2459
 __kernel_write_iter+0x42a/0x940 fs/read_write.c:616
 __kernel_write+0x120/0x180 fs/read_write.c:636
 do_acct_process+0x11ff/0x1870 kernel/acct.c:539
 slow_acct_process+0x3e8/0x510 kernel/acct.c:597
 do_exit+0x9f0/0x28e0 kernel/exit.c:929
 do_group_exit+0x207/0x2c0 kernel/exit.c:1088
 __do_sys_exit_group kernel/exit.c:1099 [inline]
 __se_sys_exit_group kernel/exit.c:1097 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097
 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232
 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: 0033:0x7ffbc0d7e719
Code: Unable to access opcode bytes at 0x7ffbc0d7e6ef.
RSP: 002b:00007ffcdf65a878 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ffbc0d7e719
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000003 R08: 00007ffcdf65a95f R09: 00007ffbc0f06260
R10: 0000000000000001 R11: 0000000000000246 R12: 00007ffbc0f06f68
R13: 00007ffbc0f06260 R14: 0000000000000003 R15: 00007ffcdf65a920
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_find_subtree_root+0x5ab/0x5c0 fs/ocfs2/alloc.c:1771
Code: 68 ea 11 8e ba f1 06 00 00 48 c7 c1 40 10 49 8c 4c 8b 44 24 20 45 89 f1 ff 33 41 57 ff 74 24 28 e8 6a 0d 22 00 48 83 c4 18 90 <0f> 0b e8 8e 17 13 fe 90 0f 0b e8 a6 25 45 08 66 0f 1f 44 00 00 90
RSP: 0018:ffffc9000d1bdfa0 EFLAGS: 00010296
RAX: 1bb296cac2b5b100 RBX: ffff888043f97018 RCX: 1bb296cac2b5b100
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc9000d1be090 R08: ffffffff81749fac R09: 1ffff92001a37b60
R10: dffffc0000000000 R11: fffff52001a37b61 R12: 0000000000000001
R13: 0000000000000010 R14: 0000000000000001 R15: 00000000000029f3
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffbb527fc00 CR3: 000000001fb5e000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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