syzbot


kernel BUG in bch2_dev_btree_bitmap_mark

Status: upstream: reported C repro on 2024/10/21 13:07
Subsystems: bcachefs
[Documentation on labels]
Reported-by: syzbot+e8eff054face85d7ea41@syzkaller.appspotmail.com
Fix commit: 27a036a0c3e7 bcachefs: Fix bch_member.btree_bitmap_shift validation
Patched on: [ci-qemu-gce-upstream-auto ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu-native-arm64-kvm ci-qemu2-riscv64]
First crash: 48d, last: 20d
Cause bisection: introduced by (bisect log) :
commit 60f2b1bcf519416dbffee219132aa949d0c39d0e
Author: Kent Overstreet <kent.overstreet@linux.dev>
Date: Tue Apr 16 23:33:51 2024 +0000

  bcachefs: Add asserts to bch2_dev_btree_bitmap_marked_sectors()

Crash: kernel BUG in bch2_dev_btree_bitmap_mark (log)
Repro: C syz .config
  
Discussions (3)
Title Replies (including bot) Last reply
[syzbot] [bcachefs?] kernel BUG in bch2_dev_btree_bitmap_mark 0 (3) 2024/11/08 04:25
[PATCH] Revert "bcachefs: Add asserts to bch2_dev_btree_bitmap_marked_sectors()" 8 (8) 2024/10/25 23:02
[PATCH] bcachefs: Add missing btree_bitmap_shift check in bch2_dev_btree_bitmap_marked_sectors 2 (2) 2024/10/24 11:33

Sample crash report:
bcachefs (loop0): check_topology... done
bcachefs (loop0): accounting_read... done
bcachefs (loop0): alloc_read... done
bcachefs (loop0): stripes_read... done
bcachefs (loop0): snapshots_read... done
bcachefs (loop0): check_allocations...
------------[ cut here ]------------
kernel BUG at fs/bcachefs/sb-members.c:453!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 0 UID: 0 PID: 5830 Comm: syz-executor319 Not tainted 6.12.0-rc5-syzkaller-00181-g6c52d4da1c74 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__bch2_dev_btree_bitmap_mark fs/bcachefs/sb-members.c:453 [inline]
RIP: 0010:bch2_dev_btree_bitmap_mark+0xfd2/0xff0 fs/bcachefs/sb-members.c:473
Code: b3 f1 ff ff e8 7f 57 4f fd 90 0f 0b e8 77 57 4f fd 90 0f 0b e8 6f 57 4f fd 90 0f 0b e8 67 57 4f fd 90 0f 0b e8 5f 57 4f fd 90 <0f> 0b e8 57 57 4f fd 90 0f 0b e8 3f f4 78 07 66 2e 0f 1f 84 00 00
RSP: 0018:ffffc90003d365a0 EFLAGS: 00010293
RAX: ffffffff84458261 RBX: 00000000ffffffc8 RCX: ffff888036ec1e00
RDX: 0000000000000000 RSI: 000000000000003f RDI: 0000000000000039
RBP: ffffc90003d367b0 R08: ffffffff84457ee1 R09: 0000000000000000
R10: 0000042098000000 R11: 0000000000000000 R12: 000000000000003f
R13: 0000042098000000 R14: ffff8880332371d0 R15: 000000000000003f
FS:  000055559504b380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559b3128e6d8 CR3: 0000000035566000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_gc_mark_key+0xc9b/0x10e0 fs/bcachefs/btree_gc.c:622
 bch2_gc_btree fs/bcachefs/btree_gc.c:698 [inline]
 bch2_gc_btrees fs/bcachefs/btree_gc.c:729 [inline]
 bch2_check_allocations+0x2324/0x7070 fs/bcachefs/btree_gc.c:1133
 bch2_run_recovery_pass+0xf0/0x1e0 fs/bcachefs/recovery_passes.c:185
 bch2_run_recovery_passes+0x387/0x870 fs/bcachefs/recovery_passes.c:232
 bch2_fs_recovery+0x25cc/0x39c0 fs/bcachefs/recovery.c:862
 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1036
 bch2_fs_get_tree+0xd68/0x1710 fs/bcachefs/fs.c:2170
 vfs_get_tree+0x90/0x2b0 fs/super.c:1800
 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: 0033:0x7f49872b8f2a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 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:00007ffe2d0b3ed8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffe2d0b3ef0 RCX: 00007f49872b8f2a
RDX: 00000000200000c0 RSI: 0000000020000000 RDI: 00007ffe2d0b3ef0
RBP: 0000000000000004 R08: 00007ffe2d0b3f30 R09: 0000000000005901
R10: 0000000000808016 R11: 0000000000000282 R12: 0000000000808016
R13: 00007ffe2d0b3f30 R14: 0000000000000003 R15: 0000000001000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__bch2_dev_btree_bitmap_mark fs/bcachefs/sb-members.c:453 [inline]
RIP: 0010:bch2_dev_btree_bitmap_mark+0xfd2/0xff0 fs/bcachefs/sb-members.c:473
Code: b3 f1 ff ff e8 7f 57 4f fd 90 0f 0b e8 77 57 4f fd 90 0f 0b e8 6f 57 4f fd 90 0f 0b e8 67 57 4f fd 90 0f 0b e8 5f 57 4f fd 90 <0f> 0b e8 57 57 4f fd 90 0f 0b e8 3f f4 78 07 66 2e 0f 1f 84 00 00
RSP: 0018:ffffc90003d365a0 EFLAGS: 00010293
RAX: ffffffff84458261 RBX: 00000000ffffffc8 RCX: ffff888036ec1e00
RDX: 0000000000000000 RSI: 000000000000003f RDI: 0000000000000039
RBP: ffffc90003d367b0 R08: ffffffff84457ee1 R09: 0000000000000000
R10: 0000042098000000 R11: 0000000000000000 R12: 000000000000003f
R13: 0000042098000000 R14: ffff8880332371d0 R15: 000000000000003f
FS:  000055559504b380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559b3128e6d8 CR3: 0000000035566000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (31):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/11/01 20:05 upstream 6c52d4da1c74 f00eed24 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs kernel BUG in bch2_dev_btree_bitmap_mark
2024/10/17 21:46 upstream 6efbea77b390 666f77ed .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/11/14 17:12 upstream 0a9b9d17f3a7 77f3eeb7 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/11/13 03:36 upstream 3022e9d00ebe 62026c85 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/11/11 11:18 upstream 2d5404caa8c7 0c4b1325 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/11/09 19:40 upstream da4373fbcf00 6b856513 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/11/08 21:27 upstream f1dce1f09380 d40c056e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/11/08 17:03 upstream 906bd684e4b1 d40c056e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/11/07 19:44 upstream ff7afaeca1a1 867e44df .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/11/06 15:41 upstream 2e1b3cc9d7f7 7b852900 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/11/06 15:39 upstream 2e1b3cc9d7f7 7b852900 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/11/06 03:20 upstream 2e1b3cc9d7f7 3a465482 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/11/06 03:08 upstream 2e1b3cc9d7f7 3a465482 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/11/05 16:34 upstream 2e1b3cc9d7f7 da38b4c9 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/11/03 11:28 upstream 3e5e6c9900c3 f00eed24 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/11/01 18:54 upstream 6c52d4da1c74 f00eed24 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/11/01 18:14 upstream 6c52d4da1c74 f00eed24 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/10/30 06:08 upstream c1e939a21eb1 66aeb999 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/10/29 03:45 upstream e42b1a9a2557 66aeb999 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/10/25 02:34 upstream 4e46774408d9 c79b8ca5 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/10/21 14:34 upstream 42f7652d3eb5 14517542 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/10/20 23:43 upstream db87114dcf13 cd6fc0a3 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/10/20 23:32 upstream db87114dcf13 cd6fc0a3 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/10/20 04:07 upstream 715ca9dd687f cd6fc0a3 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/10/19 14:28 upstream 3d5ad2d4eca3 cd6fc0a3 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/10/19 14:28 upstream 3d5ad2d4eca3 cd6fc0a3 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/10/18 13:48 upstream 4d939780b705 0270e729 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/10/18 13:40 upstream 4d939780b705 0270e729 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/10/17 21:41 upstream 6efbea77b390 666f77ed .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/10/17 21:40 upstream 6efbea77b390 666f77ed .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
2024/10/17 21:34 upstream 6efbea77b390 666f77ed .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in bch2_dev_btree_bitmap_mark
* Struck through repros no longer work on HEAD.