[syzbot] [btrfs?] general protection fault in start_transaction

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: b6bb9676f216 Merge tag 'm68knommu-for-v6.2' of git://git.k..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13431bbf880000
kernel config: https://syzkaller.appspot.com/x/.config?x=d3fb546de56fbf8d
dashboard link: https://syzkaller.appspot.com/bug?extid=96977faa68092ad382c4
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11040abf880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/2f703f794500/disk-b6bb9676.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0cca7cdd545b/vmlinux-b6bb9676.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0ce2560b7652/bzImage-b6bb9676.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/a6a120f35475/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+96977f...@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000041: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000208-0x000000000000020f]
CPU: 1 PID: 34 Comm: kworker/u4:2 Not tainted 6.1.0-syzkaller-13872-gb6bb9676f216 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: btrfs-qgroup-rescan btrfs_work_helper
RIP: 0010:start_transaction+0x48/0x10f0 fs/btrfs/transaction.c:564
Code: 48 89 fb 48 bd 00 00 00 00 00 fc ff df e8 00 90 00 fe 48 89 5c 24 38 48 81 c3 08 02 00 00 48 89 d8 48 c1 e8 03 48 89 44 24 70 <80> 3c 28 00 74 08 48 89 df e8 da 33 56 fe 48 89 5c 24 60 48 8b 03
RSP: 0018:ffffc90000ab7ab0 EFLAGS: 00010206
RAX: 0000000000000041 RBX: 0000000000000208 RCX: ffff88801779ba80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000001 R09: fffff52000156f5d
R10: fffff52000156f5d R11: 1ffff92000156f5c R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000003
FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2bea75b718 CR3: 000000001d0cc000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
btrfs_qgroup_rescan_worker+0x3bb/0x6a0 fs/btrfs/qgroup.c:3402
btrfs_work_helper+0x312/0x850 fs/btrfs/async-thread.c:280
process_one_work+0x877/0xdb0 kernel/workqueue.c:2289
worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
kthread+0x266/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:start_transaction+0x48/0x10f0 fs/btrfs/transaction.c:564
Code: 48 89 fb 48 bd 00 00 00 00 00 fc ff df e8 00 90 00 fe 48 89 5c 24 38 48 81 c3 08 02 00 00 48 89 d8 48 c1 e8 03 48 89 44 24 70 <80> 3c 28 00 74 08 48 89 df e8 da 33 56 fe 48 89 5c 24 60 48 8b 03
RSP: 0018:ffffc90000ab7ab0 EFLAGS: 00010206
RAX: 0000000000000041 RBX: 0000000000000208 RCX: ffff88801779ba80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000001 R09: fffff52000156f5d
R10: fffff52000156f5d R11: 1ffff92000156f5c R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000003
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeba9a96cc CR3: 000000000d08e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 48 89 fb mov %rdi,%rbx
3: 48 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%rbp
a: fc ff df
d: e8 00 90 00 fe callq 0xfe009012
12: 48 89 5c 24 38 mov %rbx,0x38(%rsp)
17: 48 81 c3 08 02 00 00 add $0x208,%rbx
1e: 48 89 d8 mov %rbx,%rax
21: 48 c1 e8 03 shr $0x3,%rax
25: 48 89 44 24 70 mov %rax,0x70(%rsp)
* 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction
2e: 74 08 je 0x38
30: 48 89 df mov %rbx,%rdi
33: e8 da 33 56 fe callq 0xfe563412
38: 48 89 5c 24 60 mov %rbx,0x60(%rsp)
3d: 48 8b 03 mov (%rbx),%rax


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 69b41ac87e4a Merge tag 'for-6.2-rc2-tag' of git://git.kern..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=143721cc480000
kernel config: https://syzkaller.appspot.com/x/.config?x=9babfdc3dd4772d0

dashboard link: https://syzkaller.appspot.com/bug?extid=96977faa68092ad382c4
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1382a02a480000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c7f2c2480000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d3aac1573b20/disk-69b41ac8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/31f5a860f3b3/vmlinux-69b41ac8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d4a7091814ba/bzImage-69b41ac8.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/48b08567f044/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+96977f...@syzkaller.appspotmail.com

BTRFS info (device loop3): qgroup scan completed (inconsistency flag cleared)

general protection fault, probably for non-canonical address 0xdffffc0000000041: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000208-0x000000000000020f]

CPU: 0 PID: 33 Comm: kworker/u4:2 Not tainted 6.2.0-rc2-syzkaller-00010-g69b41ac87e4a #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: btrfs-qgroup-rescan btrfs_work_helper
RIP: 0010:start_transaction+0x48/0x10f0 fs/btrfs/transaction.c:564

Code: 48 89 fb 48 bd 00 00 00 00 00 fc ff df e8 b0 72 00 fe 48 89 5c 24 38 48 81 c3 08 02 00 00 48 89 d8 48 c1 e8 03 48 89 44 24 70 <80> 3c 28 00 74 08 48 89 df e8 7a 1c 56 fe 48 89 5c 24 60 48 8b 03
RSP: 0018:ffffc90000aa7ab0 EFLAGS: 00010206

RAX: 0000000000000041 RBX: 0000000000000208 RCX: ffff888012a98000

RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000

RBP: dffffc0000000000 R08: 0000000000000001 R09: fffff52000154f5d
R10: fffff52000154f5d R11: 1ffff92000154f5c R12: 0000000000000000

R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000003
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007fc4b7306e68 CR3: 000000007c876000 CR4: 00000000003506f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Call Trace:
<TASK>
btrfs_qgroup_rescan_worker+0x3bb/0x6a0 fs/btrfs/qgroup.c:3403

btrfs_work_helper+0x312/0x850 fs/btrfs/async-thread.c:280
process_one_work+0x877/0xdb0 kernel/workqueue.c:2289
worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
kthread+0x266/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:start_transaction+0x48/0x10f0 fs/btrfs/transaction.c:564

Code: 48 89 fb 48 bd 00 00 00 00 00 fc ff df e8 b0 72 00 fe 48 89 5c 24 38 48 81 c3 08 02 00 00 48 89 d8 48 c1 e8 03 48 89 44 24 70 <80> 3c 28 00 74 08 48 89 df e8 7a 1c 56 fe 48 89 5c 24 60 48 8b 03
RSP: 0018:ffffc90000aa7ab0 EFLAGS: 00010206
RAX: 0000000000000041 RBX: 0000000000000208 RCX: ffff888012a98000

RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000

RBP: dffffc0000000000 R08: 0000000000000001 R09: fffff52000154f5d
R10: fffff52000154f5d R11: 1ffff92000154f5c R12: 0000000000000000

R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000003
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007ffdbdc81068 CR3: 000000007e8b3000 CR4: 00000000003506f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 48 89 fb mov %rdi,%rbx
3: 48 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%rbp
a: fc ff df

d: e8 b0 72 00 fe callq 0xfe0072c2

12: 48 89 5c 24 38 mov %rbx,0x38(%rsp)
17: 48 81 c3 08 02 00 00 add $0x208,%rbx
1e: 48 89 d8 mov %rbx,%rax
21: 48 c1 e8 03 shr $0x3,%rax
25: 48 89 44 24 70 mov %rax,0x70(%rsp)
* 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction
2e: 74 08 je 0x38
30: 48 89 df mov %rbx,%rdi

33: e8 7a 1c 56 fe callq 0xfe561cb2