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AJvYcCWACMSqOJ2mSHcAmI7ozFxzNxuyNHfsZ9FOQ4ou2ZWfkUpLn9WywQ9iXUIbBR0rLDq8xbf2qpaq+g6wj80RIg==@vger.kernel.org X-Gm-Message-State: AOJu0YxF6gTQacuvyoD1Bh/4qWyQUit8tjJehzST6elkhhJZlSvd7IFZ VdDALZ+u4jr45La/GDYV09L+xiI6NKM7JUhGnXm+8cNtz7lvJ7C9kux8PBR3lUwotm2WGe6Du5/ 09aPRti0lL3CgPAeVKYJgERpy6JIihJnU8sLiQn3ZZSyy92R1LpUY71s= X-Google-Smtp-Source: AGHT+IFqV+nU2Qz57UdH0pXY1vNYRVAam7Zie7skMf8m4Bc3k0pqLhD+EAGmuDvZkjK3Q07MmDfQ7ZWdi+3ssKl5WOM1ekSOBsqE Precedence: bulk X-Mailing-List: linux-bcachefs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:b4b:b0:3cf:c773:6992 with SMTP id e9e14a558f8ab-3d280906241mr91745345ab.12.1739778807973; Sun, 16 Feb 2025 23:53:27 -0800 (PST) Date: Sun, 16 Feb 2025 23:53:27 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67b2eaf7.050a0220.173698.001f.GAE@google.com> Subject: [syzbot] [bcachefs?] kernel BUG in bch2_reconstruct_snapshots From: syzbot To: kent.overstreet@linux.dev, linux-bcachefs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 128c8f96eb86 Merge tag 'drm-fixes-2025-02-14' of https://g.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=13c44bf8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e55cabe422b4fcaf dashboard link: https://syzkaller.appspot.com/bug?extid=b4cb4a6988aced0cec4b compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16d5d9b0580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=112099a4580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/419cba1a156b/disk-128c8f96.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0fa327c9a058/vmlinux-128c8f96.xz kernel image: https://storage.googleapis.com/syzbot-assets/5ad066f8a08b/bzImage-128c8f96.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/77719351875e/mount_0.gz The issue was bisected to: commit c986dd7ecba185ad2a36b0815940f34deb2a8170 Author: Kent Overstreet Date: Thu Oct 10 01:28:11 2024 +0000 bcachefs: Improve check_snapshot_exists() bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1568e098580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=1768e098580000 console output: https://syzkaller.appspot.com/x/log.txt?x=1368e098580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b4cb4a6988aced0cec4b@syzkaller.appspotmail.com Fixes: c986dd7ecba1 ("bcachefs: Improve check_snapshot_exists()") bcachefs (loop0): scanning for missing backpointers in 6/128 buckets done bcachefs (loop0): reconstruct_snapshots... snapshot node 4294905343 from tree 4294905343 missing, recreating ------------[ cut here ]------------ kernel BUG at fs/bcachefs/bkey_types.h:210! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 1 UID: 0 PID: 5822 Comm: syz-executor354 Not tainted 6.14.0-rc2-syzkaller-00185-g128c8f96eb86 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:bkey_s_c_to_subvolume fs/bcachefs/bkey_types.h:210 [inline] RIP: 0010:check_snapshot_exists fs/bcachefs/snapshot.c:884 [inline] RIP: 0010:bch2_reconstruct_snapshots+0x35a5/0x35b0 fs/bcachefs/snapshot.c:1001 Code: 08 a9 fd e9 e3 cb ff ff e8 88 51 44 fd e8 f3 fa a8 fd 4c 89 ef 89 de e8 29 68 cc ff e8 74 51 44 fd 90 0f 0b e8 6c 51 44 fd 90 <0f> 0b e8 84 e7 82 07 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90003dfee20 EFLAGS: 00010293 RAX: ffffffff847d6594 RBX: 0000000000000009 RCX: ffff88807c9d5a00 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000015 RBP: ffffc90003dff428 R08: ffffffff847d56ba R09: 0000000000000000 R10: ffffc90003dfe820 R11: fffff520007bfd11 R12: ffff8880250865c0 R13: 0000000000000000 R14: ffff888029330230 R15: 1ffff11004a10cb8 FS: 000055558bf6c380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055da28eea000 CR3: 000000005d824000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: bch2_run_recovery_pass+0xf0/0x1e0 fs/bcachefs/recovery_passes.c:226 bch2_run_recovery_passes+0x2ad/0xa90 fs/bcachefs/recovery_passes.c:291 bch2_fs_recovery+0x265a/0x3de0 fs/bcachefs/recovery.c:936 bch2_fs_start+0x37c/0x610 fs/bcachefs/super.c:1041 bch2_fs_get_tree+0xdb7/0x17a0 fs/bcachefs/fs.c:2203 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3560 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088 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: 0033:0x7fe1e5e912ea 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:00007fff4e8847f8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fff4e884810 RCX: 00007fe1e5e912ea RDX: 00004000000058c0 RSI: 0000400000005900 RDI: 00007fff4e884810 RBP: 0000400000005900 R08: 00007fff4e884850 R09: 000000000000592e R10: 0000000001000000 R11: 0000000000000282 R12: 00004000000058c0 R13: 00007fff4e884850 R14: 0000000000000003 R15: 0000000001000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bkey_s_c_to_subvolume fs/bcachefs/bkey_types.h:210 [inline] RIP: 0010:check_snapshot_exists fs/bcachefs/snapshot.c:884 [inline] RIP: 0010:bch2_reconstruct_snapshots+0x35a5/0x35b0 fs/bcachefs/snapshot.c:1001 Code: 08 a9 fd e9 e3 cb ff ff e8 88 51 44 fd e8 f3 fa a8 fd 4c 89 ef 89 de e8 29 68 cc ff e8 74 51 44 fd 90 0f 0b e8 6c 51 44 fd 90 <0f> 0b e8 84 e7 82 07 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90003dfee20 EFLAGS: 00010293 RAX: ffffffff847d6594 RBX: 0000000000000009 RCX: ffff88807c9d5a00 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000015 RBP: ffffc90003dff428 R08: ffffffff847d56ba R09: 0000000000000000 R10: ffffc90003dfe820 R11: fffff520007bfd11 R12: ffff8880250865c0 R13: 0000000000000000 R14: ffff888029330230 R15: 1ffff11004a10cb8 FS: 000055558bf6c380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055ff36f26038 CR3: 000000005d824000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup