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AJvYcCWPrD3B4TzmT3rwdikPmpo8vF7L8JwDpBOS9NGkmhbbEGs10eXrwkNDjM/1Br3Pt64oT5rq9Rj60dIBFA==@vger.kernel.org X-Gm-Message-State: AOJu0YzYpK3bsuQyO9dXmASIUR+YJM8a3IaHaOfcG+nmWcot6viBua6b k2yCAq5VDgpyQbXv078w5uuLfyVzsVfuhDZ1MVuYZH+PRbO/gn8Ixo6R3ecGTKw0c8oLGzfG4GC ZQkwTvsTbKCrQspfrk1RA9rTMbnItuge302K/1kv9TF9YG1PmxcBLRMEZNxE= X-Google-Smtp-Source: AGHT+IHmL9BLSnu80DN+JqbFo/KZW5om0NI59h0+mNh5EYW7C17VUc7j20kQei8sTorluQ6q/UGSySzVRqbRuxM686EwmuOHiLb1 Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1569:b0:3dc:7b3d:6a37 with SMTP id e9e14a558f8ab-3ddce423461mr75897805ab.8.1749298502572; Sat, 07 Jun 2025 05:15:02 -0700 (PDT) Date: Sat, 07 Jun 2025 05:15:02 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68442d46.a70a0220.27c366.0045.GAE@google.com> Subject: Re: [syzbot] [btrfs?] kernel BUG in populate_free_space_tree From: syzbot To: abinashlalotra@gmail.com, clm@fb.com, dsterba@suse.com, josef@toxicpanda.com, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in btrfs_rebuild_free_space_tree BTRFS warning: 'usebackuproot' is deprecated, use 'rescue=usebackuproot' instead BTRFS info (device loop2 state M): rebuilding free space tree ------------[ cut here ]------------ BTRFS: Transaction aborted (error -17) WARNING: CPU: 1 PID: 7626 at fs/btrfs/free-space-tree.c:1341 btrfs_rebuild_free_space_tree+0x470/0x54c fs/btrfs/free-space-tree.c:1341 Modules linked in: CPU: 1 UID: 0 PID: 7626 Comm: syz.2.25 Not tainted 6.15.0-rc7-syzkaller-00085-gd7fa1af5b33e-dirty #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : btrfs_rebuild_free_space_tree+0x470/0x54c fs/btrfs/free-space-tree.c:1341 lr : btrfs_rebuild_free_space_tree+0x470/0x54c fs/btrfs/free-space-tree.c:1341 sp : ffff80009c4f7740 x29: ffff80009c4f77b0 x28: ffff0000d4c3f400 x27: 0000000000000000 x26: dfff800000000000 x25: ffff70001389eee8 x24: 0000000000000003 x23: 1fffe000182b6e7b x22: 0000000000000000 x21: ffff0000c15b73d8 x20: 00000000ffffffef x19: ffff0000c15b7378 x18: 1fffe0003386f276 x17: ffff80008f31e000 x16: ffff80008adbe98c x15: 0000000000000001 x14: 1fffe0001b281550 x13: 0000000000000000 x12: 0000000000000000 x11: ffff60001b281551 x10: 0000000000000003 x9 : 1c8922000a902c00 x8 : 1c8922000a902c00 x7 : ffff800080485878 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : ffff80008047843c x2 : 0000000000000001 x1 : ffff80008b3ebc40 x0 : 0000000000000001 Call trace: btrfs_rebuild_free_space_tree+0x470/0x54c fs/btrfs/free-space-tree.c:1341 (P) btrfs_start_pre_rw_mount+0xa78/0xe10 fs/btrfs/disk-io.c:3074 btrfs_remount_rw fs/btrfs/super.c:1319 [inline] btrfs_reconfigure+0x828/0x2418 fs/btrfs/super.c:1543 reconfigure_super+0x1d4/0x6f0 fs/super.c:1083 do_remount fs/namespace.c:3365 [inline] path_mount+0xb34/0xde0 fs/namespace.c:4200 do_mount fs/namespace.c:4221 [inline] __do_sys_mount fs/namespace.c:4432 [inline] __se_sys_mount fs/namespace.c:4409 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4409 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 irq event stamp: 330 hardirqs last enabled at (329): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1525 [inline] hardirqs last enabled at (329): [] finish_lock_switch+0xb0/0x1c0 kernel/sched/core.c:5130 hardirqs last disabled at (330): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:511 softirqs last enabled at (10): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (8): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- BTRFS: error (device loop2 state MA) in btrfs_rebuild_free_space_tree:1341: errno=-17 Object already exists BTRFS warning (device loop2 state EMA): failed to rebuild free space tree: -17 Tested on: commit: d7fa1af5 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=152cfc0c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=89c13de706fbf07a dashboard link: https://syzkaller.appspot.com/bug?extid=36fae25c35159a763a2a compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 userspace arch: arm64 patch: https://syzkaller.appspot.com/x/patch.diff?x=168d7282580000