linux-kernel - [syzbot] [btrfs?] general protection fault in btrfs_update_reloc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Message-ID: <66f6bfa7.050a0220.38ace9.0019.GAE@google.com>
Date: Fri, 27 Sep 2024 07:22:31 -0700
From: syzbot <syzbot+283673dbc38527ef9f3d@...kaller.appspotmail.com>
To: clm@...com, dsterba@...e.com, josef@...icpanda.com, 
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [btrfs?] general protection fault in btrfs_update_reloc_root

Hello,

syzbot found the following issue on:

HEAD commit:    932d2d1fcb2b Merge tag 'dlm-6.12' of git://git.kernel.org/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=179a3177980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c208b3605ba9ec44
dashboard link: https://syzkaller.appspot.com/bug?extid=283673dbc38527ef9f3d
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/7bc7510fe41f/non_bootable_disk-932d2d1f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fbcb7198214b/vmlinux-932d2d1f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/418eaebf4817/bzImage-932d2d1f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+283673dbc38527ef9f3d@...kaller.appspotmail.com

loop0: detected capacity change from 0 to 32768
BTRFS: device fsid c9fe44da-de57-406a-8241-57ec7d4412cf devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5111)
BTRFS info (device loop0): first mount of filesystem c9fe44da-de57-406a-8241-57ec7d4412cf
BTRFS info (device loop0): using crc32c (crc32c-intel) checksum algorithm
BTRFS info (device loop0): disk space caching is enabled
BTRFS warning (device loop0): space cache v1 is being deprecated and will be removed in a future release, please use -o space_cache=v2
BTRFS info (device loop0): rebuilding free space tree
BTRFS info (device loop0): disabling free space tree
BTRFS info (device loop0): clearing compat-ro feature flag for FREE_SPACE_TREE (0x1)
BTRFS info (device loop0): clearing compat-ro feature flag for FREE_SPACE_TREE_VALID (0x2)
BTRFS info (device loop0): balance: start -d -m
BTRFS info (device loop0): relocating block group 6881280 flags data|metadata
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 1
CPU: 0 UID: 0 PID: 5111 Comm: syz.0.0 Not tainted 6.11.0-syzkaller-05442-g932d2d1fcb2b #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail_ex+0x3b0/0x4e0 lib/fault-inject.c:153
 should_failslab+0xac/0x100 mm/failslab.c:45
 slab_pre_alloc_hook mm/slub.c:4039 [inline]
 slab_alloc_node mm/slub.c:4115 [inline]
 kmem_cache_alloc_noprof+0x6c/0x2a0 mm/slub.c:4142
 start_transaction+0x830/0x1670 fs/btrfs/transaction.c:676
 prepare_to_relocate+0x31f/0x4c0 fs/btrfs/relocation.c:3642
 relocate_block_group+0x169/0xd20 fs/btrfs/relocation.c:3678
 btrfs_relocate_block_group+0x77d/0xd90 fs/btrfs/relocation.c:4150
 btrfs_relocate_chunk+0x12c/0x3b0 fs/btrfs/volumes.c:3376
 __btrfs_balance+0x1b0f/0x26b0 fs/btrfs/volumes.c:4160
 btrfs_balance+0xbdc/0x10c0 fs/btrfs/volumes.c:4537
 btrfs_ioctl_balance+0x493/0x7c0 fs/btrfs/ioctl.c:3673
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 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: 0033:0x7f9ff217def9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f9ff2edc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9ff2335f80 RCX: 00007f9ff217def9
RDX: 0000000020000180 RSI: 00000000c4009420 RDI: 0000000000000004
RBP: 00007f9ff2edc090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000000000 R14: 00007f9ff2335f80 R15: 00007ffcf8ef9128
 </TASK>
BTRFS info (device loop0): balance: ended with status: -12
Oops: general protection fault, probably for non-canonical address 0xdffffc00000000cc: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000660-0x0000000000000667]
CPU: 0 UID: 0 PID: 5111 Comm: syz.0.0 Not tainted 6.11.0-syzkaller-05442-g932d2d1fcb2b #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:btrfs_update_reloc_root+0x362/0xa80 fs/btrfs/relocation.c:926
Code: e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 07 da 34 fe bb 65 06 00 00 49 03 1e 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 4c 8b 64 24 18 0f 85 c9 05 00 00 0f b6 1b 31 ff
RSP: 0018:ffffc9000316f700 EFLAGS: 00010207
RAX: 00000000000000cc RBX: 0000000000000665 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 00000000ffffffff
RBP: ffffc9000316f810 R08: ffffffff83c687df R09: fffff5200062def4
R10: dffffc0000000000 R11: fffff5200062def4 R12: dffffc0000000000
R13: 0000000000000001 R14: ffff8880008111d0 R15: ffff888035802038
FS:  00007f9ff2edc6c0(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9fe73f9000 CR3: 000000003feac000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 commit_fs_roots+0x2ee/0x720 fs/btrfs/transaction.c:1496
 btrfs_commit_transaction+0xfaf/0x3740 fs/btrfs/transaction.c:2430
 del_balance_item fs/btrfs/volumes.c:3678 [inline]
 reset_balance_state+0x25e/0x3c0 fs/btrfs/volumes.c:3742
 btrfs_balance+0xead/0x10c0 fs/btrfs/volumes.c:4574
 btrfs_ioctl_balance+0x493/0x7c0 fs/btrfs/ioctl.c:3673
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 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: 0033:0x7f9ff217def9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f9ff2edc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9ff2335f80 RCX: 00007f9ff217def9
RDX: 0000000020000180 RSI: 00000000c4009420 RDI: 0000000000000004
RBP: 00007f9ff2edc090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000000000 R14: 00007f9ff2335f80 R15: 00007ffcf8ef9128
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:btrfs_update_reloc_root+0x362/0xa80 fs/btrfs/relocation.c:926
Code: e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 07 da 34 fe bb 65 06 00 00 49 03 1e 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 4c 8b 64 24 18 0f 85 c9 05 00 00 0f b6 1b 31 ff
RSP: 0018:ffffc9000316f700 EFLAGS: 00010207
RAX: 00000000000000cc RBX: 0000000000000665 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 00000000ffffffff
RBP: ffffc9000316f810 R08: ffffffff83c687df R09: fffff5200062def4
R10: dffffc0000000000 R11: fffff5200062def4 R12: dffffc0000000000
R13: 0000000000000001 R14: ffff8880008111d0 R15: ffff888035802038
FS:  00007f9ff2edc6c0(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e5284b79b2 CR3: 000000003feac000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	e8 03 42 80 3c       	call   0x3c804208
   5:	20 00                	and    %al,(%rax)
   7:	74 08                	je     0x11
   9:	4c 89 f7             	mov    %r14,%rdi
   c:	e8 07 da 34 fe       	call   0xfe34da18
  11:	bb 65 06 00 00       	mov    $0x665,%ebx
  16:	49 03 1e             	add    (%r14),%rbx
  19:	48 89 d8             	mov    %rbx,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	4c 8b 64 24 18       	mov    0x18(%rsp),%r12
  35:	0f 85 c9 05 00 00    	jne    0x604
  3b:	0f b6 1b             	movzbl (%rbx),%ebx
  3e:	31 ff                	xor    %edi,%edi


---
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@...glegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup