[syzbot] [bcachefs?] kernel BUG in bch2_rechecksum_bio

[syzbot <syzbot+50d3544c9b8db9c99fd2@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    59b723cd2adb Linux 6.12-rc6
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1693f630580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=11254d3590b16717
dashboard link: https://syzkaller.appspot.com/bug?extid=50d3544c9b8db9c99fd2
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1391ad5f980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12e546a7980000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-59b723cd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6b98f620edf1/vmlinux-59b723cd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b5d1377ba568/bzImage-59b723cd.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/4854d6cc2b6a/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+50d3544c9b8db9c99fd2@syzkaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at fs/bcachefs/checksum.c:424!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5323 Comm: bch-rebalance/l Not tainted 6.12.0-rc6-syzkaller #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:bch2_rechecksum_bio+0x148c/0x14b0 fs/bcachefs/checksum.c:424
Code: 48 89 df e8 76 b9 d7 fd e9 4d f9 ff ff 89 f9 80 e1 07 38 c1 0f 8c 1c fd ff ff e8 4f ba d7 fd e9 12 fd ff ff e8 e5 f3 6d fd 90 <0f> 0b e8 dd f3 6d fd 90 0f 0b e8 d5 f3 6d fd 90 0f 0b e8 1d 50 a0
RSP: 0018:ffffc9000d186b20 EFLAGS: 00010293
RAX: ffffffff8426e67b RBX: 0000000000000007 RCX: ffff88801e00c880
RDX: 0000000000000000 RSI: 0000000000000018 RDI: 0000000000000008
RBP: ffffc9000d186e70 R08: ffffffff8426d688 R09: 0000000000000000
R10: ffffc9000d186d40 R11: fffff52001a30dae R12: 0000000000000018
R13: dffffc0000000000 R14: 0000000000000008 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bb8ac5e0b8 CR3: 0000000011c00000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_write_rechecksum fs/bcachefs/io_write.c:776 [inline]
 bch2_write_prep_encoded_data fs/bcachefs/io_write.c:877 [inline]
 bch2_write_extent fs/bcachefs/io_write.c:909 [inline]
 __bch2_write+0x2f7b/0x5dd0 fs/bcachefs/io_write.c:1461
 bch2_write+0x9b5/0x1760 fs/bcachefs/io_write.c:1634
 closure_queue include/linux/closure.h:270 [inline]
 closure_call include/linux/closure.h:432 [inline]
 bch2_data_update_read_done+0x22e/0x330 fs/bcachefs/data_update.c:426
 move_write fs/bcachefs/move.c:133 [inline]
 bch2_moving_ctxt_do_pending_writes+0x44c/0x8d0 fs/bcachefs/move.c:164
 bch2_moving_ctxt_flush_all+0x1c3/0x2f0 fs/bcachefs/move.c:179
 do_rebalance fs/bcachefs/rebalance.c:379 [inline]
 bch2_rebalance_thread+0x1a87/0x1fc0 fs/bcachefs/rebalance.c:401
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_rechecksum_bio+0x148c/0x14b0 fs/bcachefs/checksum.c:424
Code: 48 89 df e8 76 b9 d7 fd e9 4d f9 ff ff 89 f9 80 e1 07 38 c1 0f 8c 1c fd ff ff e8 4f ba d7 fd e9 12 fd ff ff e8 e5 f3 6d fd 90 <0f> 0b e8 dd f3 6d fd 90 0f 0b e8 d5 f3 6d fd 90 0f 0b e8 1d 50 a0
RSP: 0018:ffffc9000d186b20 EFLAGS: 00010293
RAX: ffffffff8426e67b RBX: 0000000000000007 RCX: ffff88801e00c880
RDX: 0000000000000000 RSI: 0000000000000018 RDI: 0000000000000008
RBP: ffffc9000d186e70 R08: ffffffff8426d688 R09: 0000000000000000
R10: ffffc9000d186d40 R11: fffff52001a30dae R12: 0000000000000018
R13: dffffc0000000000 R14: 0000000000000008 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbfaf9ff000 CR3: 000000001fb7e000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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