syzbot

 sign-in | mailing list | source | docs
🐞 Open [1592]
≡ Subsystems
🐞 Fixed [6233]
🐞 Invalid [15779]
⬇ Missing Backports [183]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

KASAN: use-after-free Read in bch2_btree_node_read_done

Status: upstream: reported C repro on 2024/11/25 13:27
Subsystems: bcachefs
[Documentation on labels]
Reported-by: syzbot+92e65e9b7a42d379f92e@syzkaller.appspotmail.com
First crash: 175d, last: 8d19h
Cause bisection: introduced by (bisect log) :
commit 03ef80b469d5d83530ce1ce15be78a40e5300f9b
Author: Kent Overstreet <kent.overstreet@linux.dev>
Date: Sat Sep 23 22:41:51 2023 +0000

  bcachefs: Ignore unknown mount options

Crash: invalid opcode in bch2_dump_bset (log)
Repro: C syz .config
  
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [bcachefs?] KASAN: use-after-free Read in bch2_btree_node_read_done 0 (1) 2024/11/25 13:27
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2025/01/15 18:48 13m retest repro upstream report log

Sample crash report:
  node offset 8/24 bset u64s 375 bset byte offset 184: keys out of order: u64s 11 type alloc_v4 0:32:0 len 0 ver 0 > u64s 11 type alloc_v4 0:2:0 len 0 ver 0, fixing
bcachefs (loop0): btree_node_read_work: rewriting btree node at btree=alloc level=0 SPOS_MAX due to error
==================================================================
BUG: KASAN: use-after-free in bch2_btree_node_read_done+0xfbe/0x5e90 fs/bcachefs/btree_io.c:1087
Read of size 8 at addr ffff888076abc010 by task syz-executor345/5842

CPU: 1 UID: 0 PID: 5842 Comm: syz-executor345 Not tainted 6.12.0-syzkaller-08446-g228a1157fb9f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 bch2_btree_node_read_done+0xfbe/0x5e90 fs/bcachefs/btree_io.c:1087
 btree_node_read_work+0x68b/0x1260 fs/bcachefs/btree_io.c:1323
 bch2_btree_node_read+0x2433/0x2a10
 __bch2_btree_root_read fs/bcachefs/btree_io.c:1749 [inline]
 bch2_btree_root_read+0x617/0x7a0 fs/bcachefs/btree_io.c:1771
 read_btree_roots+0x296/0x840 fs/bcachefs/recovery.c:523
 bch2_fs_recovery+0x2585/0x39d0 fs/bcachefs/recovery.c:853
 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1037
 bch2_fs_get_tree+0xd68/0x1710 fs/bcachefs/fs.c:2170
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc4572667ea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 3e 06 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007ffd22484098 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc4572667ea
RDX: 00000000200000c0 RSI: 0000000020000180 RDI: 00007ffd224840f0
RBP: 0000000000000004 R08: 00007ffd22484130 R09: 000000000000593e
R10: 0000000000000010 R11: 0000000000000282 R12: 00007ffd22484130
R13: 0000000001000000 R14: 0000000000000003 R15: 0000000000000010
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x76abc
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001ca0108 ffff8880b87447e0 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 2, migratetype Reclaimable, gfp_mask 0x452cd0(GFP_KERNEL_ACCOUNT|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_RECLAIMABLE), pid 5842, tgid 5842 (syz-executor345), ts 64163821991, free_ts 64389007908
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556
 prep_new_page mm/page_alloc.c:1564 [inline]
 get_page_from_freelist+0x363e/0x3790 mm/page_alloc.c:3474
 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4751
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 ___kmalloc_large_node+0x8b/0x1d0 mm/slub.c:4209
 __kmalloc_large_node_noprof+0x1a/0x80 mm/slub.c:4236
 __do_kmalloc_node mm/slub.c:4252 [inline]
 __kmalloc_node_noprof+0x2d2/0x440 mm/slub.c:4270
 __kvmalloc_node_noprof+0x72/0x190 mm/util.c:658
 btree_node_data_alloc+0xdb/0x260 fs/bcachefs/btree_cache.c:153
 __bch2_btree_node_mem_alloc+0x1d8/0x3e0 fs/bcachefs/btree_cache.c:198
 bch2_fs_btree_cache_init+0x26f/0x630 fs/bcachefs/btree_cache.c:653
 bch2_fs_alloc fs/bcachefs/super.c:917 [inline]
 bch2_fs_open+0x2aa4/0x2f80 fs/bcachefs/super.c:2065
 bch2_fs_get_tree+0x738/0x1710 fs/bcachefs/fs.c:2157
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
page last free pid 5842 tgid 5842 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_unref_page+0xded/0x1130 mm/page_alloc.c:2657
 __folio_put+0x2c7/0x440 mm/swap.c:112
 folio_put include/linux/mm.h:1490 [inline]
 free_large_kmalloc+0x105/0x1c0 mm/slub.c:4698
 kfree+0x21c/0x440 mm/slub.c:4721
 btree_bounce_free fs/bcachefs/btree_io.c:112 [inline]
 bch2_btree_node_read_done+0x3c8a/0x5e90 fs/bcachefs/btree_io.c:1209
 btree_node_read_work+0x68b/0x1260 fs/bcachefs/btree_io.c:1323
 bch2_btree_node_read+0x2433/0x2a10
 __bch2_btree_root_read fs/bcachefs/btree_io.c:1749 [inline]
 bch2_btree_root_read+0x617/0x7a0 fs/bcachefs/btree_io.c:1771
 read_btree_roots+0x296/0x840 fs/bcachefs/recovery.c:523
 bch2_fs_recovery+0x2585/0x39d0 fs/bcachefs/recovery.c:853
 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1037
 bch2_fs_get_tree+0xd68/0x1710 fs/bcachefs/fs.c:2170
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83

Memory state around the buggy address:
 ffff888076abbf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888076abbf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888076abc000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                         ^
 ffff888076abc080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888076abc100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================

Crashes (62):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/11/23 23:20 upstream 228a1157fb9f 68da6d95 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: use-after-free Read in bch2_btree_node_read_done
2025/04/24 19:52 upstream e72e9e693307 9c80ffa0 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2024/11/22 22:40 upstream 28eb75e178d3 68da6d95 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/03/06 00:17 upstream bb2281fb05e5 831e3629 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: slab-out-of-bounds Read in bch2_btree_node_read_done
2025/03/05 23:16 upstream cfced12f5100 034534df .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/05/05 18:12 upstream 92a09c47464d 6ca47dd8 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/05/05 15:41 upstream 92a09c47464d 6ca47dd8 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/05/02 23:42 upstream 00b827f0cffa b0714e37 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/04/26 01:22 upstream c3137514f1f1 c6b4fb39 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/04/25 14:50 upstream 02ddfb981de8 dea5c7e4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/04/22 10:21 upstream a33b5a08cbbd 2a20f901 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/04/18 01:39 upstream b5c6891b2c5b 2a20f901 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/04/10 20:27 upstream 2eb959eeecc6 1ef3ab4d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/03/31 23:32 upstream 609706855d90 36d76a97 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/03/28 05:01 upstream 4fa118e5b79f 6c09fb82 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/03/26 23:55 upstream 1e26c5e28ca5 19e40f48 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/03/20 23:36 upstream 5fc319360819 62330552 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/03/19 17:30 upstream 81e4f8d68c66 8d0a2921 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/03/18 15:22 upstream fc444ada1310 ce3352cd .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/03/08 12:06 upstream 21e4543a2e2f 7e3bd60d .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/02/20 23:56 upstream e9a8cac0bf89 0808a665 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/02/20 12:51 upstream 87a132e73910 50668798 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/02/10 11:17 upstream a64dcfb451e2 ef44b750 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/02/05 07:42 upstream 5c8c229261f1 5896748e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/02/02 21:57 upstream 69e858e0b8b2 568559e4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/02/02 07:18 upstream 69e858e0b8b2 568559e4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/01/31 23:12 upstream 69e858e0b8b2 aa47157c .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/01/31 22:24 upstream 69e858e0b8b2 aa47157c .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/01/28 15:18 upstream 805ba04cb7cc ac37c1f8 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/01/28 08:02 upstream 805ba04cb7cc 18070896 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/01/28 03:20 upstream 805ba04cb7cc 18070896 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/01/26 18:12 upstream aa22f4da2a46 9fbd772e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/01/26 04:51 upstream 405057718a1f 9fbd772e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/01/26 04:09 upstream 405057718a1f 9fbd772e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/01/25 18:03 upstream b46c89c08f41 9fbd772e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/01/24 00:59 upstream 21266b8df522 f6a35ef3 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/01/23 19:58 upstream 21266b8df522 f6a35ef3 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/01/22 08:56 upstream c4b9570cfb63 da72ac06 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/01/21 13:56 upstream 3d3a9c8b89d4 6e87cfa2 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/01/21 13:14 upstream 3d3a9c8b89d4 6e87cfa2 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2024/12/31 17:22 upstream ccb98ccef0e5 d3ccff63 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2024/12/25 16:28 upstream 9b2ffa6148b1 444551c4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2024/12/21 08:43 upstream e9b8ffafd20a d7f584ee .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2024/12/19 02:27 upstream aef25be35d23 1432fc84 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2024/12/19 02:25 upstream aef25be35d23 1432fc84 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2024/12/11 10:04 upstream f92f4749861b cfc402b4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2024/11/27 21:53 upstream aaf20f870da0 5df23865 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2024/11/24 13:23 upstream 9f16d5e6f220 68da6d95 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2024/11/24 09:47 upstream 9f16d5e6f220 68da6d95 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2024/11/22 22:30 upstream 28eb75e178d3 68da6d95 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2024/11/22 22:28 upstream 28eb75e178d3 68da6d95 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: use-after-free Read in bch2_btree_node_read_done
2025/05/08 11:06 upstream d76bb1ebb558 dbf35fa1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in bch2_btree_node_read_done
2025/03/18 19:07 upstream 76b6905c11fd 22a6c2b1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in bch2_btree_node_read_done
2025/03/15 22:34 upstream 3571e8b091f4 e2826670 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in bch2_btree_node_read_done
2025/03/05 22:56 upstream cfced12f5100 034534df .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in bch2_btree_node_read_done
2025/01/01 18:45 upstream ccb98ccef0e5 d3ccff63 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in bch2_btree_node_read_done
2024/12/26 00:39 upstream 9b2ffa6148b1 444551c4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in bch2_btree_node_read_done
2024/12/25 17:43 upstream 9b2ffa6148b1 444551c4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in bch2_btree_node_read_done
2024/12/21 11:51 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 573067a5a685 d7f584ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in bch2_btree_node_read_done
* Struck through repros no longer work on HEAD.