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unhandled error case in bch2_bkey_pick_read_device
WARNING: CPU: 0 PID: 5950 at fs/bcachefs/extents.c:230 bch2_bkey_pick_read_device+0x17a5/0x1a00 fs/bcachefs/extents.c:230
Modules linked in:
CPU: 0 UID: 0 PID: 5950 Comm: syz.2.7 Not tainted 6.14.0-syzkaller-10514-g7f2ff7b62617 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:bch2_bkey_pick_read_device+0x17a5/0x1a00 fs/bcachefs/extents.c:230
Code: c1 16 5a fd e9 d0 fd ff ff e8 b7 16 5a fd c6 05 08 b9 de 0b 01 90 48 c7 c7 60 96 93 8c 48 c7 c6 fb 87 59 8e e8 ec 20 19 fd 90 <0f> 0b 90 90 e9 bc fe ff ff e8 8d 16 5a fd e9 6e ff ff ff 89 d9 80
RSP: 0018:ffffc900045ee100 EFLAGS: 00010246
RAX: 839f12b56859d900 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000cd7a000 RSI: 0000000000050e5a RDI: 0000000000050e5b
RBP: ffffc900045ee330 R08: ffffffff81826742 R09: fffffbfff1d7a934
R10: dffffc0000000000 R11: fffffbfff1d7a934 R12: dffffc0000000000
R13: 1ffff920008bdc48 R14: 0000000000000000 R15: 0000000000000000
FS:  00007feb28e286c0(0000) GS:ffff888124fed000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3422ad56c0 CR3: 0000000025696000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __bch2_read_extent+0x3ab/0x4400 fs/bcachefs/io_read.c:962
 bch2_read_extent fs/bcachefs/io_read.h:140 [inline]
 bchfs_read+0x2a88/0x3300 fs/bcachefs/fs-io-buffered.c:226
 bch2_readahead+0xe7a/0x12d0 fs/bcachefs/fs-io-buffered.c:301
 read_pages+0x193/0x590 mm/readahead.c:160
 page_cache_ra_order+0xa37/0xca0 mm/readahead.c:515
 do_sync_mmap_readahead+0x4a1/0x980 mm/filemap.c:-1
 filemap_fault+0x8b3/0x14a0 mm/filemap.c:3414
 bch2_page_fault+0x52e/0x960 fs/bcachefs/fs-io-pagecache.c:594
 __do_fault+0x135/0x390 mm/memory.c:4994
 do_read_fault mm/memory.c:5414 [inline]
 do_fault mm/memory.c:5548 [inline]
 do_pte_missing mm/memory.c:4059 [inline]
 handle_pte_fault mm/memory.c:5893 [inline]
 __handle_mm_fault+0x40c8/0x6ef0 mm/memory.c:6036
 handle_mm_fault+0x2dd/0x800 mm/memory.c:6205
 faultin_page mm/gup.c:1196 [inline]
 __get_user_pages+0x1adf/0x4180 mm/gup.c:1491
 populate_vma_page_range+0x266/0x340 mm/gup.c:1929
 __mm_populate+0x27d/0x460 mm/gup.c:2032
 mm_populate include/linux/mm.h:3377 [inline]
 vm_mmap_pgoff+0x390/0x530 mm/util.c:584
 ksys_mmap_pgoff+0x4ee/0x720 mm/mmap.c:607
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feb27f8d169
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:00007feb28e28038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007feb281a5fa0 RCX: 00007feb27f8d169
RDX: 00000000007ffff7 RSI: 0000000000600000 RDI: 0000200000000000
RBP: 00007feb2800e2a0 R08: 0000000000000006 R09: 0000000000000000
R10: 0000000004012011 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007feb281a5fa0 R15: 00007ffd2ffbfce8
 </TASK>