Message-ID: <677a63b1.050a0220.380ff0.000e.GAE@google.com>
Date: Sun, 05 Jan 2025 02:49:21 -0800
From: syzbot <syzbot+251e4e8c49656d1d3c25@...kaller.appspotmail.com>
To: kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [bcachefs?] kernel BUG in bch2_btree_root_alloc_fake_trans

Hello,

syzbot found the following issue on:

HEAD commit:    ccb98ccef0e5 Merge tag 'platform-drivers-x86-v6.13-4' of g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1607d818580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1c541fa8af5c9cc7
dashboard link: https://syzkaller.appspot.com/bug?extid=251e4e8c49656d1d3c25
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-ccb98cce.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/703c842459ce/vmlinux-ccb98cce.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1a8db4bb5dbb/bzImage-ccb98cce.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+251e4e8c49656d1d3c25@...kaller.appspotmail.com

loop0: detected capacity change from 0 to 32775
bcachefs (loop0): starting version 1.7: mi_btree_bitmap opts=errors=continue,metadata_checksum=none,data_checksum=none,compression=gzip,degraded,norecovery,reconstruct_alloc,no_data_io
bcachefs (loop0): recovering from clean shutdown, journal seq 10
bcachefs (loop0): Version upgrade required:
Version upgrade from 0.24: unwritten_extents to 1.7: mi_btree_bitmap incomplete
Doing incompatible version upgrade from 0.24: unwritten_extents to 1.13: inode_has_child_snapshots
  running recovery passes: check_allocations,check_alloc_info,check_lrus,check_btree_backpointers,check_backpointers_to_extents,check_extents_to_backpointers,check_alloc_to_lru_refs,bucket_gens_init,check_snapshot_trees,check_snapshots,check_subvols,check_subvol_children,delete_dead_snapshots,check_inodes,check_extents,check_indirect_extents,check_dirents,check_xattrs,check_root,check_unreachable_inodes,check_subvolume_structure,check_directory_structure,check_nlinks,set_fs_needs_rebalance
bcachefs (loop0): dropping and reconstructing all alloc info
bcachefs (loop0): error validating btree node on loop0 at btree extents level 0/0
  u64s 11 type btree_ptr_v2 18446744073707239423:U64_MAX:U32_MAX len 0 ver 0: seq c6c25c03258c59c5 written 16 min_key POS_MIN durability: 1 ptr: 0:27:0 gen 0  
  node offset 0/16 bset u64s 0: incorrect max key SPOS_MAX
bcachefs (loop0): flagging btree extents lost data
error reading btree root extents l=0: btree_node_read_error, fixing
bcachefs (loop0): will run btree node scan
bcachefs (loop0): error validating btree node on loop0 at btree inodes level 0/0
  u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 7589ab5e0c11cc7a written 24 min_key POS_MIN durability: 1 ptr: 0:38:0 gen 0  
  node offset 0/24: got wrong btree node: got
  btree=inodes l=0 seq 18446744073709551615x
  min: POS_MIN
  max: SPOS_MAX
bcachefs (loop0): flagging btree inodes lost data
error reading btree root inodes l=0: btree_node_read_error, fixing
bcachefs (loop0): error validating btree node on loop0 at btree dirents level 0/0
  u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 9aa2895aefce4bdf written 24 min_key POS_MIN durability: 1 ptr: 0:41:0 gen 0  
  node offset 0/24: bad magic: want 59513f585d347cd2, got 0
bcachefs (loop0): flagging btree dirents lost data
error reading btree root dirents l=0: btree_node_read_error, fixing
bcachefs (loop0): error validating btree node on loop0 at btree deleted_inodes level 0/0
  u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 1db8f60c84bb244c written 8 min_key POS_MIN durability: 1 ptr: 0:42:0 gen 0  
  node offset 0/8: bad magic: want 59513f585d347cd2, got 0
bcachefs (loop0): flagging btree deleted_inodes lost data
error reading btree root deleted_inodes l=0: btree_node_read_error, fixing
bcachefs (loop0): scan_for_btree_nodes...
bch2_scan_for_btree_nodes: nodes found after overwrites:
  extents l=0 seq=1 journal_seq=5 cookie=c6c25c03258c59c5 POS_MIN-SPOS_MAX ptr: 0:27:0 gen 0
  xattrs l=0 seq=1 journal_seq=4 cookie=2285c34bed0abe32 POS_MIN-SPOS_MAX ptr: 0:31:0 gen 0
  subvolumes l=0 seq=1 journal_seq=1 cookie=c0bef60d07ceb940 POS_MIN-SPOS_MAX ptr: 0:35:0 gen 0
  snapshots l=0 seq=1 journal_seq=1 cookie=ebb8d5a9e3463bdb POS_MIN-SPOS_MAX ptr: 0:32:0 gen 0
  lru l=0 seq=1 journal_seq=5 cookie=28f61e078e70b95c POS_MIN-SPOS_MAX ptr: 0:28:0 gen 0
 done
bcachefs (loop0): check_topology...
bcachefs (loop0): btree root extents unreadable, must recover from scan
------------[ cut here ]------------
kernel BUG at fs/bcachefs/btree_update_interior.c:2559!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5315 Comm: syz.0.0 Not tainted 6.13.0-rc5-syzkaller-00004-gccb98ccef0e5 #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_btree_root_alloc_fake_trans+0xc14/0xc20 fs/bcachefs/btree_update_interior.c:2559
Code: 48 8b 4c 24 30 80 e1 07 38 c1 0f 8c 9e fc ff ff 48 8b 7c 24 30 e8 3c db dd fd e9 8f fc ff ff e8 b2 a9 a0 07 e8 ed 73 77 fd 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000d476f20 EFLAGS: 00010287
RAX: ffffffff8427fff3 RBX: 00000000ffffffef RCX: 0000000000100000
RDX: ffffc9000e47a000 RSI: 000000000004fe69 RDI: 000000000004fe6a
RBP: ffffc9000d4771f0 R08: ffffffff8427fc99 R09: 1ffff92001a8edcc
R10: dffffc0000000000 R11: fffff52001a8edcd R12: ffff888052b80000
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff888051fdb000
FS:  00007f31a6ff06c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bb6f4f6028 CR3: 0000000041f34000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_check_topology+0x3b0/0xb20 fs/bcachefs/btree_gc.c:537
 bch2_run_recovery_pass+0xf0/0x1e0 fs/bcachefs/recovery_passes.c:191
 bch2_run_recovery_passes+0x3a7/0x880 fs/bcachefs/recovery_passes.c:244
 bch2_fs_recovery+0x25cc/0x39d0 fs/bcachefs/recovery.c:861
 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: 0033:0x7f31a61874ca
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f31a6fefe68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f31a6fefef0 RCX: 00007f31a61874ca
RDX: 00000000200000c0 RSI: 0000000020000000 RDI: 00007f31a6fefeb0
RBP: 00000000200000c0 R08: 00007f31a6fefef0 R09: 0000000000800000
R10: 0000000000800000 R11: 0000000000000246 R12: 0000000020000000
R13: 00007f31a6fefeb0 R14: 0000000000005983 R15: 0000000020005bc0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_btree_root_alloc_fake_trans+0xc14/0xc20 fs/bcachefs/btree_update_interior.c:2559
Code: 48 8b 4c 24 30 80 e1 07 38 c1 0f 8c 9e fc ff ff 48 8b 7c 24 30 e8 3c db dd fd e9 8f fc ff ff e8 b2 a9 a0 07 e8 ed 73 77 fd 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000d476f20 EFLAGS: 00010287
RAX: ffffffff8427fff3 RBX: 00000000ffffffef RCX: 0000000000100000
RDX: ffffc9000e47a000 RSI: 000000000004fe69 RDI: 000000000004fe6a
RBP: ffffc9000d4771f0 R08: ffffffff8427fc99 R09: 1ffff92001a8edcc
R10: dffffc0000000000 R11: fffff52001a8edcd R12: ffff888052b80000
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff888051fdb000
FS:  00007f31a6ff06c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bb6f4f6028 CR3: 0000000041f34000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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