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Thu, 26 Jun 2025 11:20:22 +0200 Message-ID: Date: Thu, 26 Jun 2025 18:50:17 +0930 Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [BUG] btrfs: Assertion failed in btrfs_exclop_balance on balance ioctl To: cen zhang , clm@fb.com, josef@toxicpanda.com, dsterba@suse.com Cc: linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, baijiaju1990@gmail.com, zhenghaoran154@gmail.com References: Content-Language: en-US From: Qu Wenruo Autocrypt: addr=quwenruo.btrfs@gmx.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNIlF1IFdlbnJ1byA8cXV3ZW5ydW8uYnRyZnNAZ214LmNvbT7CwJQEEwEIAD4CGwMFCwkI BwIGFQgJCgsCBBYCAwECHgECF4AWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCZxF1YAUJEP5a sQAKCRDCPZHzoSX+qF+mB/9gXu9C3BV0omDZBDWevJHxpWpOwQ8DxZEbk9b9LcrQlWdhFhyn xi+l5lRziV9ZGyYXp7N35a9t7GQJndMCFUWYoEa+1NCuxDs6bslfrCaGEGG/+wd6oIPb85xo naxnQ+SQtYLUFbU77WkUPaaIU8hH2BAfn9ZSDX9lIxheQE8ZYGGmo4wYpnN7/hSXALD7+oun tZljjGNT1o+/B8WVZtw/YZuCuHgZeaFdhcV2jsz7+iGb+LsqzHuznrXqbyUQgQT9kn8ZYFNW 7tf+LNxXuwedzRag4fxtR+5GVvJ41Oh/eygp8VqiMAtnFYaSlb9sjia1Mh+m+OBFeuXjgGlG VvQFzsBNBFnVga8BCACqU+th4Esy/c8BnvliFAjAfpzhI1wH76FD1MJPmAhA3DnX5JDORcga CbPEwhLj1xlwTgpeT+QfDmGJ5B5BlrrQFZVE1fChEjiJvyiSAO4yQPkrPVYTI7Xj34FnscPj /IrRUUka68MlHxPtFnAHr25VIuOS41lmYKYNwPNLRz9Ik6DmeTG3WJO2BQRNvXA0pXrJH1fN GSsRb+pKEKHKtL1803x71zQxCwLh+zLP1iXHVM5j8gX9zqupigQR/Cel2XPS44zWcDW8r7B0 q1eW4Jrv0x19p4P923voqn+joIAostyNTUjCeSrUdKth9jcdlam9X2DziA/DHDFfS5eq4fEv ABEBAAHCwHwEGAEIACYCGwwWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCZxF1gQUJEP5a0gAK CRDCPZHzoSX+qHGpB/kB8A7M7KGL5qzat+jBRoLwB0Y3Zax0QWuANVdZM3eJDlKJKJ4HKzjo B2Pcn4JXL2apSan2uJftaMbNQbwotvabLXkE7cPpnppnBq7iovmBw++/d8zQjLQLWInQ5kNq Vmi36kmq8o5c0f97QVjMryHlmSlEZ2Wwc1kURAe4lsRG2dNeAd4CAqmTw0cMIrR6R/Dpt3ma +8oGXJOmwWuDFKNV4G2XLKcghqrtcRf2zAGNogg3KulCykHHripG3kPKsb7fYVcSQtlt5R6v HZStaZBzw4PcDiaAF3pPDBd+0fIKS6BlpeNRSFG94RYrt84Qw77JWDOAZsyNfEIEE0J6LSR/ In-Reply-To: Content-Type: text/plain; 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The assertion fs_info->exclusive_operation =3D=3D > BTRFS_EXCLOP_BALANCE_PAUSED fails, indicating that the function was > called with an unexpected exclusive operation state. >=20 > Here are the relevant details: >=20 > Kernel Version: 6.16.0-rc1-g7f6432600434-dirty > Hardware: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996) Reproducer please? I guess you guys are running syzbot, then please provide the usual=20 syzbot assets. >=20 > Crash Log: > assertion failed: fs_info->exclusive_operation =3D=3D > BTRFS_EXCLOP_BALANCE_PAUSED :: 0, in fs/btrfs/fs.c:127 > ------------[ cut here ]------------ > kernel BUG at fs/btrfs/fs.c:127! > Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI > CPU: 0 UID: 0 PID: 95466 Comm: syz-executor.6 Not tainted > 6.16.0-rc1-g7f6432600434-dirty #52 PREEMPT(voluntary) > Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS > 1.16.3-debian-1.16.3-2 04/01/2014 > RIP: 0010:btrfs_exclop_balance+0x632/0x640 fs/btrfs/fs.c:127 > Code: b5 fe e8 11 0c c7 fe 48 c7 c7 60 06 19 9c 48 c7 c6 80 08 19 9c > 31 d2 48 c7 c1 40 08 19 9c 41 b8 7f 00 00 00 e8 7f 2e 7b fe 90 <0f> 0b > 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 > RSP: 0018:ffff88811c37fd88 EFLAGS: 00010246 > RAX: 0000000000000068 RBX: 0000000000000000 RCX: 7c00c5848baac500 > RDX: ffffc9001dfc5000 RSI: 000000000000092e RDI: 000000000000092f > RBP: 1ffff110277c95ae R08: ffff88811c37fc2f R09: 1ffff1102386ff85 > R10: dffffc0000000000 R11: ffffed102386ff86 R12: ffff88813be4ad70 > R13: 1ffffda204ef92b5 R14: dffffc0000000000 R15: ffffed10277c95ae > FS: 00007fda4d92c6c0(0000) GS:ffff88840ff1b000(0000) knlGS:000000000000= 0000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000001b31222000 CR3: 000000012ebdb000 CR4: 00000000000006f0 > Call Trace: > > btrfs_ioctl_balance+0x9bd/0xf10 fs/btrfs/ioctl.c:3548 > btrfs_ioctl+0x104f/0x1480 fs/btrfs/ioctl.c:5303 > vfs_ioctl fs/ioctl.c:51 [inline] > __do_sys_ioctl fs/ioctl.c:907 [inline] > __se_sys_ioctl+0xd1/0x130 fs/ioctl.c:893 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xcf/0x240 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fda4e7fa35d > Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 > 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fda4d92c0a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00007fda4e94c1f0 RCX: 00007fda4e7fa35d > RDX: 0000000020008c40 RSI: 00000000c4009420 RDI: 0000000000000003 > RBP: 00007fda4e86b4b1 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: ffffffffffffffb8 R14: 00007fda4e94c1f0 R15: 00007ffc61c2f0d0 > > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:btrfs_exclop_balance+0x632/0x640 fs/btrfs/fs.c:127 > Code: b5 fe e8 11 0c c7 fe 48 c7 c7 60 06 19 9c 48 c7 c6 80 08 19 9c > 31 d2 48 c7 c1 40 08 19 9c 41 b8 7f 00 00 00 e8 7f 2e 7b fe 90 <0f> 0b > 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 > RSP: 0018:ffff88811c37fd88 EFLAGS: 00010246 > RAX: 0000000000000068 RBX: 0000000000000000 RCX: 7c00c5848baac500 > RDX: ffffc9001dfc5000 RSI: 000000000000092e RDI: 000000000000092f > RBP: 1ffff110277c95ae R08: ffff88811c37fc2f R09: 1ffff1102386ff85 > R10: dffffc0000000000 R11: ffffed102386ff86 R12: ffff88813be4ad70 > R13: 1ffffda204ef92b5 R14: dffffc0000000000 R15: ffffed10277c95ae > FS: 00007fda4d92c6c0(0000) GS:ffff88840ff1b000(0000) knlGS:000000000000= 0000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000001b31222000 CR3: 000000012ebdb000 CR4: 00000000000006f0 > note: syz-executor.6[95466] exited with preempt_count 1 >=20 > Here is the machineinfo: > ------------------------------------------------------------------------= =2D------- > QEMU emulator version 8.2.2 (Debian 1:8.2.2+ds-0ubuntu1.7) > qemu-system-x86_64 ["-m" "16384" "-smp" "4" "-chardev" > "socket,id=3DSOCKSYZ,server=3Don,wait=3Doff,host=3Dlocalhost,port=3D2467= 4" > "-mon" "chardev=3DSOCKSYZ,mode=3Dcontrol" "-display" "none" "-serial" > "stdio" "-no-reboot" "-name" "VM-1" "-device" "virtio-rng-pci" > "-enable-kvm" "-hdb" > "/home/zzzccc/go-work/syzkaller-old/syzkaller/test/btrfs/disk.qcow2" > "-device" "e1000,netdev=3Dnet0" "-netdev" > "user,id=3Dnet0,restrict=3Don,hostfwd=3Dtcp:127.0.0.1:35475-:22,hostfwd= =3Dtcp::7313-:6060" > "-hda" "/home/zzzccc/go-work/syzkaller-old/syzkaller/test/btrfs/bookworm= .img" > "-snapshot" "-kernel" "/home/zzzccc/linux-DDRD/arch/x86/boot/bzImage" > "-append" "root=3D/dev/sda console=3DttyS0 "] >=20 > [CPU Info] > processor : 0, 1, 2, 3 > vendor_id : AuthenticAMD > cpu family : 15 > model : 107 > model name : QEMU Virtual CPU version 2.5+ > stepping : 1 > microcode : 0x1000065 > cpu MHz : 3593.248 > cache size : 512 KB > physical id : 0 > siblings : 4 > core id : 0, 1, 2, 3 > cpu cores : 4 > apicid : 0, 1, 2, 3 > initial apicid : 0, 1, 2, 3 > fpu : yes > fpu_exception : yes > cpuid level : 13 > wp : yes > flags : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge > mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx lm rep_good > nopl cpuid extd_apicid tsc_known_freq pni cx16 x2apic hypervisor > lahf_lm cmp_legacy svm 3dnowprefetch vmmcall > bugs : fxsave_leak sysret_ss_attrs null_seg > swapgs_fence amd_e400 spectre_v1 spectre_v2 spectre_v2_user > bogomips : 7186.49 > TLB size : 1024 4K pages > clflush size : 64 > cache_alignment : 64 > address sizes : 40 bits physical, 48 bits virtual > power management : >=20 > ------------------------------------------------------------------------= =2D------- >=20 > Here is the log of this > bug:https://github.com/zzzcccyyyggg/Syzkaller-log/blob/main/c206ec44dc55= 2558339e6db76afe471d2dcee23b/log3 >=20 > Thank you for your attention to this matter. >=20 > Best regards, > Cen Zhang >=20