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Thu, 29 Aug 2024 00:59:38 +0200 Message-ID: <371fa45d-bf8c-4180-9a9f-63962f6aa0e0@gmx.com> Date: Thu, 29 Aug 2024 08:29:33 +0930 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [btrfs?] kernel BUG in __extent_writepage_io (2) To: syzbot , clm@fb.com, dsterba@suse.com, hch@lst.de, josef@toxicpanda.com, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <0000000000008851fe0620c5f51c@google.com> 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+qAUCY00iVQUJDToH pgAKCRDCPZHzoSX+qNKACACkjDLzCvcFuDlgqCiS4ajHAo6twGra3uGgY2klo3S4JespWifr BLPPak74oOShqNZ8yWzB1Bkz1u93Ifx3c3H0r2vLWrImoP5eQdymVqMWmDAq+sV1Koyt8gXQ XPD2jQCrfR9nUuV1F3Z4Lgo+6I5LjuXBVEayFdz/VYK63+YLEAlSowCF72Lkz06TmaI0XMyj jgRNGM2MRgfxbprCcsgUypaDfmhY2nrhIzPUICURfp9t/65+/PLlV4nYs+DtSwPyNjkPX72+ LdyIdY+BqS8cZbPG5spCyJIlZonADojLDYQq4QnufARU51zyVjzTXMg5gAttDZwTH+8LbNI4 mm2YzsBNBFnVga8BCACqU+th4Esy/c8BnvliFAjAfpzhI1wH76FD1MJPmAhA3DnX5JDORcga CbPEwhLj1xlwTgpeT+QfDmGJ5B5BlrrQFZVE1fChEjiJvyiSAO4yQPkrPVYTI7Xj34FnscPj /IrRUUka68MlHxPtFnAHr25VIuOS41lmYKYNwPNLRz9Ik6DmeTG3WJO2BQRNvXA0pXrJH1fN GSsRb+pKEKHKtL1803x71zQxCwLh+zLP1iXHVM5j8gX9zqupigQR/Cel2XPS44zWcDW8r7B0 q1eW4Jrv0x19p4P923voqn+joIAostyNTUjCeSrUdKth9jcdlam9X2DziA/DHDFfS5eq4fEv ABEBAAHCwHwEGAEIACYCGwwWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCY00ibgUJDToHvwAK CRDCPZHzoSX+qK6vB/9yyZlsS+ijtsvwYDjGA2WhVhN07Xa5SBBvGCAycyGGzSMkOJcOtUUf tD+ADyrLbLuVSfRN1ke738UojphwkSFj4t9scG5A+U8GgOZtrlYOsY2+cG3R5vjoXUgXMP37 INfWh0KbJodf0G48xouesn08cbfUdlphSMXujCA8y5TcNyRuNv2q5Nizl8sKhUZzh4BascoK DChBuznBsucCTAGrwPgG4/ul6HnWE8DipMKvkV9ob1xJS2W4WJRPp6QdVrBWJ9cCdtpR6GbL iQi22uZXoSPv/0oUrGU+U5X4IvdnvT+8viPzszL5wXswJZfqfy8tmHM85yjObVdIG6AlnrrD In-Reply-To: <0000000000008851fe0620c5f51c@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:PzofUyJAiJ0iIoU4jstpDl+nyegVsgIg0HzrzMxW2E6DvUiRkml ty4OFtVolPscPHN2iBQ3P5IRJUqKLU0TimyrGiha1WTlmL0ad4gUPTUV7Y2FVos+W3z/ogu 1gViYQ11KnSelHNFCjNtz0YgpWSLmA2KJtDKX5sLysRZU0B9r5PeVPBMLCJAmLL+VlZ9hDW VfU60TtXBHWm3OwKaUY0A== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:p6OYhuSJtzM=;8dFWlvPcGM4VWeKXIL7B3hbY3Q/ loebZzSZhuHe9IoALGlc5RWTk+B0fZ9tzVIY4laKLH66pIZf0UlUcIZYd1/59YN7kySIC6+fL 4FOERPvb/0fQHKRqedMHPpNm0GDmEV9eWTWkjavTBFWuwnP+bJqpuh6Xd1433Sq6wmS9CpYcB L3wlWwNKVqODHeyXpAjCdVTEjbN+IzXjSKunSqzxZwQ9jWbm/FFOOLKhATwKoaQynYa7clAEl 8LySonKXde2SxA4chgyUyvYY6uPvpD8a4E8VvDQvTbDUtRHogqJWzu317JWgcOp22bBdiNv+D 7c3Jy+BXZYKlKHqz+a+tKbAlOg7u1ffW5VAeMQmu9U5U/sY3MWzShTK3eTxF25ljKgtUChejq mALxHFMixSWGgM77tvkZ/8mT1R69wyioTIj6/A0WeqCDjLKw27FevZeRnI4hTvcsZb5jRSxLR sFNG8nZyFuY+7mrakZpwg2AMJJCwedqThfldSKLecNCXRWCXTGBtBA61OkRSj+fYKDZgXPf8C IWPT2czS59DYAZXRe50P0LjR4TBOV+v0w/mj2gU565rbnbMb78boi7dxiPcWH4p/XoMFBInEO fVqoTofkfP3aUiR+hPsDaCtCLfJV0luoA1dmMJxiFjY6ni6H61cGI42rgx9jpeBpJN94iHHW+ 6eekk9/sO3HOiuKYMo97NjUFQMcE6wW7/iCRfUEQA7lM+7bn5DUP54sd+gApA1smCwTCA7ohR f0ZPLybZrJp5/wCs7hx1H7qxW0yQZjol8666d2PHsX9LTbOkVGHuSva5qBA0nftk5fBqKWBuf aoi0i271NJI1a5MZyvIAG+EYPnRc5vj3boGYgBgfUEDyM= =E5=9C=A8 2024/8/29 08:04, syzbot =E5=86=99=E9=81=93: > Hello, > > syzbot found the following issue on: > > HEAD commit: d2bafcf224f3 Merge tag 'cgroup-for-6.11-rc4-fixes' of gi= t:.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=3D12d5fa7b9800= 00 > kernel config: https://syzkaller.appspot.com/x/.config?x=3D4fc2afd52fd0= 08bb > dashboard link: https://syzkaller.appspot.com/bug?extid=3Dba3c0273042a89= 8c230e > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for De= bian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D137c040b98= 0000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D16ddb0159800= 00 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/7569f02310fb/di= sk-d2bafcf2.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/e30fee7b6c1d/vmlin= ux-d2bafcf2.xz > kernel image: https://storage.googleapis.com/syzbot-assets/2ffddebac153/= bzImage-d2bafcf2.xz > mounted in repro #1: https://storage.googleapis.com/syzbot-assets/cd0855= 7ae343/mount_0.gz > mounted in repro #2: https://storage.googleapis.com/syzbot-assets/90ff83= 92fe84/mount_2.gz > mounted in repro #3: https://storage.googleapis.com/syzbot-assets/9c5b91= 850930/mount_7.gz > > The issue was bisected to: > > commit f22b5dcbd71edea087946511554956591557de9a > Author: Christoph Hellwig > Date: Wed May 31 06:04:59 2023 +0000 > > btrfs: remove non-standard extent handling in __extent_writepage_io > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=3D109740439= 80000 > final oops: https://syzkaller.appspot.com/x/report.txt?x=3D129740439= 80000 > console output: https://syzkaller.appspot.com/x/log.txt?x=3D149740439800= 00 > > IMPORTANT: if you fix the issue, please add the following tag to the com= mit: > Reported-by: syzbot+ba3c0273042a898c230e@syzkaller.appspotmail.com > Fixes: f22b5dcbd71e ("btrfs: remove non-standard extent handling in __ex= tent_writepage_io") > > assertion failed: block_start !=3D EXTENT_MAP_HOLE, in fs/btrfs/extent_i= o.c:1488 This means there is a dirty page range for us to writeback, but no delalloc range for it. That patch is not the cause, but only exposed it. I guess there is some page fault involved or interrupted direct IO? Anyway the bisection doesn't make much sense. Thanks, Qu > ------------[ cut here ]------------ > kernel BUG at fs/btrfs/extent_io.c:1488! > Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI > CPU: 1 UID: 0 PID: 5722 Comm: syz-executor399 Not tainted 6.11.0-rc4-syz= kaller-00255-gd2bafcf224f3 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS = Google 08/06/2024 > RIP: 0010:__extent_writepage_io+0x1224/0x1400 fs/btrfs/extent_io.c:1488 > Code: f7 07 90 0f 0b e8 dc 68 df fd 48 c7 c7 e0 92 2c 8c 48 c7 c6 c0 a0 = 2c 8c 48 c7 c2 80 92 2c 8c b9 d0 05 00 00 e8 9d 15 f7 07 90 <0f> 0b e8 b5 = 68 df fd 48 8b 3c 24 e8 bc 9d ff ff 48 89 c7 48 c7 c6 > RSP: 0018:ffffc900097d6ee8 EFLAGS: 00010246 > RAX: 000000000000004e RBX: 0000000000000000 RCX: 2f9fd79be1350f00 > RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 > RBP: dffffc0000000000 R08: ffffffff817402ac R09: 1ffff920012fad7c > R10: dffffc0000000000 R11: fffff520012fad7d R12: ffffea0001ccbdc8 > R13: 1ffffd40003997b9 R14: fffffffffffffffd R15: 000000000007b000 > FS: 00007f11a84976c0(0000) GS:ffff8880b9300000(0000) knlGS:000000000000= 0000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f11a0fff000 CR3: 0000000020e4c000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > __extent_writepage fs/btrfs/extent_io.c:1578 [inline] > extent_write_cache_pages fs/btrfs/extent_io.c:2251 [inline] > btrfs_writepages+0x12a2/0x2760 fs/btrfs/extent_io.c:2373 > do_writepages+0x35d/0x870 mm/page-writeback.c:2683 > filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:397 > __filemap_fdatawrite_range mm/filemap.c:430 [inline] > filemap_fdatawrite_range+0x120/0x180 mm/filemap.c:448 > btrfs_fdatawrite_range+0x53/0xe0 fs/btrfs/file.c:3794 > btrfs_direct_write+0x558/0xb40 fs/btrfs/direct-io.c:952 > btrfs_do_write_iter+0x2a1/0x760 fs/btrfs/file.c:1505 > do_iter_readv_writev+0x60a/0x890 > vfs_writev+0x37c/0xbb0 fs/read_write.c:971 > do_pwritev fs/read_write.c:1072 [inline] > __do_sys_pwritev2 fs/read_write.c:1131 [inline] > __se_sys_pwritev2+0x1ca/0x2d0 fs/read_write.c:1122 > 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: 0033:0x7f11a850bd79 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 1d 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007f11a8497158 EFLAGS: 00000212 ORIG_RAX: 0000000000000148 > RAX: ffffffffffffffda RBX: 00007f11a85916d8 RCX: 00007f11a850bd79 > RDX: 0000000000000001 RSI: 0000000020000240 RDI: 0000000000000004 > RBP: 00007f11a85916d0 R08: 0000000000000000 R09: 0000000000000003 > R10: 0000000000002000 R11: 0000000000000212 R12: 00007f11a85916dc > R13: 000000000000006e R14: 00007ffd9dcad860 R15: 00007ffd9dcad948 > > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:__extent_writepage_io+0x1224/0x1400 fs/btrfs/extent_io.c:1488 > Code: f7 07 90 0f 0b e8 dc 68 df fd 48 c7 c7 e0 92 2c 8c 48 c7 c6 c0 a0 = 2c 8c 48 c7 c2 80 92 2c 8c b9 d0 05 00 00 e8 9d 15 f7 07 90 <0f> 0b e8 b5 = 68 df fd 48 8b 3c 24 e8 bc 9d ff ff 48 89 c7 48 c7 c6 > RSP: 0018:ffffc900097d6ee8 EFLAGS: 00010246 > RAX: 000000000000004e RBX: 0000000000000000 RCX: 2f9fd79be1350f00 > RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 > RBP: dffffc0000000000 R08: ffffffff817402ac R09: 1ffff920012fad7c > R10: dffffc0000000000 R11: fffff520012fad7d R12: ffffea0001ccbdc8 > R13: 1ffffd40003997b9 R14: fffffffffffffffd R15: 000000000007b000 > FS: 00007f11a84976c0(0000) GS:ffff8880b9200000(0000) knlGS:000000000000= 0000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00005654e2821068 CR3: 0000000020e4c000 CR4: 00000000003506f0 > 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#bisec= tion > > 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 >