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[2403:580d:fda1::299]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-31f63da6141sm8315065a91.1.2025.08.01.14.48.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 01 Aug 2025 14:48:09 -0700 (PDT) Message-ID: <45b62d6f-40fb-41c0-9c1a-e97b341930e3@suse.com> Date: Sat, 2 Aug 2025 07:18:04 +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: [syzbot] [btrfs?] WARNING in btrfs_lookup_extent_info (2) To: syzbot , clm@fb.com, dsterba@suse.com, josef@toxicpanda.com, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <688d0dde.050a0220.f0410.0130.GAE@google.com> Content-Language: en-US From: Qu Wenruo Autocrypt: addr=wqu@suse.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNGFF1IFdlbnJ1byA8d3F1QHN1c2UuY29tPsLAlAQTAQgAPgIbAwULCQgHAgYVCAkKCwIE FgIDAQIeAQIXgBYhBC3fcuWlpVuonapC4cI9kfOhJf6oBQJnEXVgBQkQ/lqxAAoJEMI9kfOh Jf6o+jIH/2KhFmyOw4XWAYbnnijuYqb/obGae8HhcJO2KIGcxbsinK+KQFTSZnkFxnbsQ+VY fvtWBHGt8WfHcNmfjdejmy9si2jyy8smQV2jiB60a8iqQXGmsrkuR+AM2V360oEbMF3gVvim 2VSX2IiW9KERuhifjseNV1HLk0SHw5NnXiWh1THTqtvFFY+CwnLN2GqiMaSLF6gATW05/sEd V17MdI1z4+WSk7D57FlLjp50F3ow2WJtXwG8yG8d6S40dytZpH9iFuk12Sbg7lrtQxPPOIEU rpmZLfCNJJoZj603613w/M8EiZw6MohzikTWcFc55RLYJPBWQ+9puZtx1DopW2jOwE0EWdWB rwEIAKpT62HgSzL9zwGe+WIUCMB+nOEjXAfvoUPUwk+YCEDcOdfkkM5FyBoJs8TCEuPXGXBO Cl5P5B8OYYnkHkGWutAVlUTV8KESOIm/KJIA7jJA+Ss9VhMjtePfgWexw+P8itFRSRrrwyUf E+0WcAevblUi45LjWWZgpg3A80tHP0iToOZ5MbdYk7YFBE29cDSleskfV80ZKxFv6koQocq0 vXzTfHvXNDELAuH7Ms/WJcdUzmPyBf3Oq6mKBBH8J6XZc9LjjNZwNbyvsHSrV5bgmu/THX2n g/3be+iqf6OggCiy3I1NSMJ5KtR0q2H2Nx2Vqb1fYPOID8McMV9Ll6rh8S8AEQEAAcLAfAQY AQgAJgIbDBYhBC3fcuWlpVuonapC4cI9kfOhJf6oBQJnEXWBBQkQ/lrSAAoJEMI9kfOhJf6o cakH+QHwDszsoYvmrNq36MFGgvAHRjdlrHRBa4A1V1kzd4kOUokongcrOOgHY9yfglcvZqlJ qfa4l+1oxs1BvCi29psteQTtw+memmcGruKi+YHD7793zNCMtAtYidDmQ2pWaLfqSaryjlzR /3tBWMyvIeWZKURnZbBzWRREB7iWxEbZ014B3gICqZPDRwwitHpH8Om3eZr7ygZck6bBa4MU o1XgbZcspyCGqu1xF/bMAY2iCDcq6ULKQceuKkbeQ8qxvt9hVxJC2W3lHq8dlK1pkHPDg9wO JoAXek8MF37R8gpLoGWl41FIUb3hFiu3zhDDvslYM4BmzI18QgQTQnotJH8= In-Reply-To: <688d0dde.050a0220.f0410.0130.GAE@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit 在 2025/8/2 04:26, syzbot 写道: > Hello, > > syzbot found the following issue on: > > HEAD commit: 038d61fd6422 Linux 6.16 > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=17bd14a2580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=831eea247244ce8c > dashboard link: https://syzkaller.appspot.com/bug?extid=c035bce0effd1de39e05 > compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-038d61fd.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/45453fb53a5d/vmlinux-038d61fd.xz > kernel image: https://storage.googleapis.com/syzbot-assets/4094774b8a7e/bzImage-038d61fd.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+c035bce0effd1de39e05@syzkaller.appspotmail.com The real problem happens before that: [ 76.684845][ T5354] FAULT_INJECTION: forcing a failure. [ 76.684845][ T5354] name failslab, interval 1, probability 0, space 0, times 1 [ 76.699734][ T5354] CPU: 0 UID: 0 PID: 5354 Comm: syz.0.0 Not tainted 6.16.0-syzkaller #0 PREEMPT(full) [ 76.699754][ T5354] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 76.699761][ T5354] Call Trace: [ 76.699766][ T5354] [ 76.699772][ T5354] dump_stack_lvl+0x189/0x250 [ 76.699851][ T5354] ? __pfx____ratelimit+0x10/0x10 [ 76.699894][ T5354] ? __pfx_dump_stack_lvl+0x10/0x10 [ 76.699908][ T5354] ? __pfx__printk+0x10/0x10 [ 76.699927][ T5354] ? __pfx___might_resched+0x10/0x10 [ 76.699940][ T5354] ? fs_reclaim_acquire+0x7d/0x100 [ 76.699992][ T5354] should_fail_ex+0x414/0x560 [ 76.700013][ T5354] should_failslab+0xa8/0x100 [ 76.700030][ T5354] kmem_cache_alloc_noprof+0x73/0x3c0 [ 76.700043][ T5354] ? __btrfs_inc_extent_ref+0x1e0/0x710 [ 76.700063][ T5354] __btrfs_inc_extent_ref+0x1e0/0x710 [ 76.700085][ T5354] ? __pfx___btrfs_inc_extent_ref+0x10/0x10 [ 76.700113][ T5354] __btrfs_run_delayed_refs+0xea2/0x3a50 An ENOMEM is injected to a critical path. And we handled it gracefully, not crashing the kernel. But this also means the extent tree is not properly updated (thus can be considered as a corrupted extent tree)> > BTRFS info (device loop0): balance: start -d -m > BTRFS info (device loop0): relocating block group 6881280 flags data|metadata > BTRFS info (device loop0): relocating block group 5242880 flags data|metadata > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 5337 at fs/btrfs/extent-tree.c:209 btrfs_lookup_extent_info+0xcc6/0xd80 fs/btrfs/extent-tree.c:209 The warning is very likely to be caused by the previous error injection. I'd say, if you're injecting errors, please allow us to give a warning or two. Thanks, Qu > Modules linked in: > CPU: 0 UID: 0 PID: 5337 Comm: syz.0.0 Not tainted 6.16.0-syzkaller #0 PREEMPT(full) > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 > RIP: 0010:btrfs_lookup_extent_info+0xcc6/0xd80 fs/btrfs/extent-tree.c:209 > Code: 8b ff ff ff 48 8b 7c 24 50 48 c7 c6 31 97 ae 8d ba a9 00 00 00 b9 8b ff ff ff e8 c5 85 6a fd e9 16 fe ff ff e8 0b ee 00 fe 90 <0f> 0b 90 e9 6d fd ff ff e8 dd 44 b0 07 89 d9 80 e1 07 38 c1 0f 8c > RSP: 0018:ffffc9000ddfeea0 EFLAGS: 00010293 > RAX: ffffffff83bf4305 RBX: ffff8880363d43b0 RCX: ffff8880118c0000 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: ffffc9000ddff000 R08: ffff8880363d43b3 R09: 1ffff11006c7a876 > R10: dffffc0000000000 R11: ffffed1006c7a877 R12: dffffc0000000000 > R13: ffff88805325c6d4 R14: 0000000000000000 R15: ffffc9000ddff0c0 > FS: 00007fe87d3d46c0(0000) GS:ffff88808d218000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000200000453000 CR3: 0000000011d7e000 CR4: 0000000000352ef0 > Call Trace: > > update_ref_for_cow+0x998/0x1210 fs/btrfs/ctree.c:373 > btrfs_force_cow_block+0x9d4/0x1e10 fs/btrfs/ctree.c:527 > btrfs_cow_block+0x40a/0x830 fs/btrfs/ctree.c:688 > do_relocation+0xd64/0x1610 fs/btrfs/relocation.c:2275 > relocate_tree_block fs/btrfs/relocation.c:2528 [inline] > relocate_tree_blocks+0x118b/0x1e90 fs/btrfs/relocation.c:2635 > relocate_block_group+0x760/0xd90 fs/btrfs/relocation.c:3607 > btrfs_relocate_block_group+0x966/0xde0 fs/btrfs/relocation.c:4008 > btrfs_relocate_chunk+0x12a/0x3b0 fs/btrfs/volumes.c:3437 > __btrfs_balance+0x1870/0x21d0 fs/btrfs/volumes.c:4212 > btrfs_balance+0xc94/0x11d0 fs/btrfs/volumes.c:4589 > btrfs_ioctl_balance+0x3d3/0x610 fs/btrfs/ioctl.c:3583 > vfs_ioctl fs/ioctl.c:51 [inline] > __do_sys_ioctl fs/ioctl.c:907 [inline] > __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fe880f8e9a9 > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007fe87d3d4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00007fe8811b6080 RCX: 00007fe880f8e9a9 > RDX: 0000200000000180 RSI: 00000000c4009420 RDI: 0000000000000005 > RBP: 00007fe881010d69 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 0000000000000001 R14: 00007fe8811b6080 R15: 00007ffc53dc1948 > > > > --- > 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. > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > 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 >