[xfs?] general protection fault in xfs_free_extent_fix_freelist

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 0ddc84d2dd43 Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10ddc2aac80000
kernel config: https://syzkaller.appspot.com/x/.config?x=6c84f77790aba2eb
dashboard link: https://syzkaller.appspot.com/bug?extid=42117ec814f4ddd2bc17
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
CC: [djw...@kernel.org linux-...@vger.kernel.org linux-...@vger.kernel.org linu...@vger.kernel.org]

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7d4155126955/disk-0ddc84d2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/29c39ebfb219/vmlinux-0ddc84d2.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2a85b4d94c88/bzImage-0ddc84d2.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+42117e...@syzkaller.appspotmail.com

XFS (loop3): Ending clean mount
XFS (loop3): Quotacheck needed: Please wait.
XFS (loop3): Quotacheck: Done.
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 PID: 16402 Comm: syz-executor.3 Not tainted 6.3.0-rc2-syzkaller-00069-g0ddc84d2dd43 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
RIP: 0010:xfs_free_extent_fix_freelist+0xd3/0x200 fs/xfs/libxfs/xfs_alloc.c:3537
Code: 42 80 3c 30 00 0f 85 2d 01 00 00 4d 8b 74 24 30 48 8d 7d 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 4c 89 74 24 38 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e ec 00 00 00 44 8b 65 08 49 8d
RSP: 0018:ffffc90016437738 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: 1ffff92002c86ee7 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffc90016437768
R10: fffffbfff1cef702 R11: 0000000000000000 R12: ffff88802a5d64a0
R13: ffffc900164378d8 R14: ffff88801cc3a000 R15: 000000000000000c
FS: 00007f1a1c5fe700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3282d000 CR3: 000000007ef99000 CR4: 0000000000350ee0
Call Trace:
<TASK>
__xfs_free_extent+0x15e/0x420 fs/xfs/libxfs/xfs_alloc.c:3586
xfs_free_extent fs/xfs/libxfs/xfs_alloc.h:158 [inline]
xfs_ag_extend_space+0x34b/0x4c0 fs/xfs/libxfs/xfs_ag.c:1046
xfs_resizefs_init_new_ags fs/xfs/xfs_fsops.c:77 [inline]
xfs_growfs_data_private fs/xfs/xfs_fsops.c:151 [inline]
xfs_growfs_data+0xf6a/0x1090 fs/xfs/xfs_fsops.c:294
xfs_file_ioctl+0x8a5/0x1c30 fs/xfs/xfs_ioctl.c:2064
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f1a1da8c0f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1a1c5fe168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1a1dbabf80 RCX: 00007f1a1da8c0f9
RDX: 0000000020000100 RSI: 000000004010586e RDI: 0000000000000004
RBP: 00007f1a1dae7b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffddf3feabf R14: 00007f1a1c5fe300 R15: 0000000000022000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:xfs_free_extent_fix_freelist+0xd3/0x200 fs/xfs/libxfs/xfs_alloc.c:3537
Code: 42 80 3c 30 00 0f 85 2d 01 00 00 4d 8b 74 24 30 48 8d 7d 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 4c 89 74 24 38 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e ec 00 00 00 44 8b 65 08 49 8d
RSP: 0018:ffffc90016437738 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: 1ffff92002c86ee7 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffc90016437768
R10: fffffbfff1cef702 R11: 0000000000000000 R12: ffff88802a5d64a0
R13: ffffc900164378d8 R14: ffff88801cc3a000 R15: 000000000000000c
FS: 00007f1a1c5fe700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3282f000 CR3: 000000007ef99000 CR4: 0000000000350ee0
----------------
Code disassembly (best guess):
0: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1)
5: 0f 85 2d 01 00 00 jne 0x138
b: 4d 8b 74 24 30 mov 0x30(%r12),%r14
10: 48 8d 7d 08 lea 0x8(%rbp),%rdi
14: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
1b: fc ff df
1e: 48 89 fa mov %rdi,%rdx
21: 48 c1 ea 03 shr $0x3,%rdx
25: 4c 89 74 24 38 mov %r14,0x38(%rsp)
* 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 74 08 je 0x3a
32: 3c 03 cmp $0x3,%al
34: 0f 8e ec 00 00 00 jle 0x126
3a: 44 8b 65 08 mov 0x8(%rbp),%r12d
3e: 49 rex.WB
3f: 8d .byte 0x8d


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.