syzbot

bcachefs (loop0): /file0/file0 offset 0: data_read_io_err
  u64s 8 type extent 4099:8:U32_MAX len 8 ver 1: durability: 1 crc: c_size 8 size 8 offset 0 nonce 0 csum chacha20_poly1305_80 77fa:f532966a693125aa  compress incompressible ptr: 0:34:0 gen 0
bcachefs (loop0): /file0/file0 offset 0: data read error: data_read_io_err
bcachefs (loop0): /file0/file0 offset 0: data read error, data_read_io_err
  u64s 8 type extent 4099:8:U32_MAX len 8 ver 1: durability: 1 crc: c_size 8 size 8 offset 0 nonce 0 csum chacha20_poly1305_80 77fa:f532966a693125aa  compress incompressible ptr: 0:34:0 gen 0
  loop0 io error
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kernel BUG at fs/bcachefs/btree_iter.c:3462!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 76 Comm: kworker/u4:4 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: events_unbound bch2_rbio_retry
RIP: 0010:__bch2_trans_get+0xce2/0xd80 fs/bcachefs/btree_iter.c:3460
Code: fd e9 81 f4 ff ff 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 9b fa ff ff 4c 89 ff e8 e9 c9 f8 fd e9 8e fa ff ff e8 9f c9 93 fd 90 <0f> 0b 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 45 fd ff ff 4c 89 e7
RSP: 0018:ffffc9000126f460 EFLAGS: 00010293
RAX: ffffffff842c1661 RBX: ffff8880340a0000 RCX: ffff88801a658000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000000
RBP: 0000000000000004 R08: ffffffff8fc3ec37 R09: 1ffffffff1f87d86
R10: dffffc0000000000 R11: fffffbfff1f87d87 R12: ffff888052b04200
R13: 000000000000004c R14: dffffc0000000000 R15: ffff8880561441d8
FS:  0000000000000000(0000) GS:ffff88808d001000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000006900 CR3: 00000000512a6000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 bch2_rbio_retry+0x1d1/0x19b0 fs/bcachefs/io_read.c:594
 bch2_rbio_done fs/bcachefs/io_read.c:464 [inline]
 bch2_rbio_retry+0xbf4/0x19b0 fs/bcachefs/io_read.c:667
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__bch2_trans_get+0xce2/0xd80 fs/bcachefs/btree_iter.c:3460
Code: fd e9 81 f4 ff ff 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 9b fa ff ff 4c 89 ff e8 e9 c9 f8 fd e9 8e fa ff ff e8 9f c9 93 fd 90 <0f> 0b 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 45 fd ff ff 4c 89 e7
RSP: 0018:ffffc9000126f460 EFLAGS: 00010293
RAX: ffffffff842c1661 RBX: ffff8880340a0000 RCX: ffff88801a658000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000000
RBP: 0000000000000004 R08: ffffffff8fc3ec37 R09: 1ffffffff1f87d86
R10: dffffc0000000000 R11: fffffbfff1f87d87 R12: ffff888052b04200
R13: 000000000000004c R14: dffffc0000000000 R15: ffff8880561441d8
FS:  0000000000000000(0000) GS:ffff88808d001000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f20f0377fb8 CR3: 0000000042db4000 CR4: 0000000000352ef0