Messages in this thread | | | Date | Mon, 25 Oct 2021 08:16:59 +0800 | From | Gao Xiang <> | Subject | Re: [syzbot] WARNING in z_erofs_lz4_decompress |
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Hi,
On Sat, Oct 23, 2021 at 07:25:20PM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 60e8840126bd Add linux-next specific files for 20211018 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=125932af300000 > kernel config: https://syzkaller.appspot.com/x/.config?x=4bd44cafcda7632e > dashboard link: https://syzkaller.appspot.com/bug?extid=d8aaffc3719597e8cfb4 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > > Unfortunately, I don't have any reproducer for this issue yet. > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+d8aaffc3719597e8cfb4@syzkaller.appspotmail.com > > erofs: (device loop4): z_erofs_lz4_decompress_mem: failed to decompress -4100 in[4096, 0] out[9000] > ------------[ cut here ]------------ > WARNING: CPU: 1 PID: 9895 at fs/erofs/decompressor.c:230 z_erofs_lz4_decompress_mem fs/erofs/decompressor.c:227 [inline] > WARNING: CPU: 1 PID: 9895 at fs/erofs/decompressor.c:230 z_erofs_lz4_decompress+0x841/0x1400 fs/erofs/decompressor.c:289
If you fuzz compressed data, that is what you'd expect..
Thanks, Gao Xiang
> Modules linked in: > CPU: 1 PID: 9895 Comm: kworker/u5:3 Not tainted 5.15.0-rc5-next-20211018-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Workqueue: erofs_unzipd z_erofs_decompressqueue_work > RIP: 0010:z_erofs_lz4_decompress_mem fs/erofs/decompressor.c:230 [inline] > RIP: 0010:z_erofs_lz4_decompress+0x841/0x1400 fs/erofs/decompressor.c:289 > Code: e9 03 80 3c 11 00 0f 85 8c 0a 00 00 41 56 48 8b 7d 00 45 89 e9 89 d9 48 c7 c2 20 eb fb 89 48 c7 c6 40 ed fb 89 e8 ee 5d 85 05 <0f> 0b 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 08 5f 48 89 ca 48 > RSP: 0018:ffffc90001b3f718 EFLAGS: 00010286 > RAX: 0000000000000000 RBX: ffffffffffffeffc RCX: 0000000000000000 > RDX: ffff8880795b3a00 RSI: ffffffff815ef308 RDI: fffff52000367ed3 > RBP: ffffc90001b3f858 R08: 0000000000000063 R09: 0000000000000000 > R10: ffffffff815e90de R11: 0000000000000000 R12: 0000000000000000 > R13: 0000000000000000 R14: 0000000000002328 R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000001b2ef25000 CR3: 000000002b3f7000 CR4: 00000000003506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > z_erofs_decompress_pcluster.isra.0+0x1389/0x2450 fs/erofs/zdata.c:977 > z_erofs_decompress_queue fs/erofs/zdata.c:1055 [inline] > z_erofs_decompressqueue_work+0xe0/0x170 fs/erofs/zdata.c:1066 > process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297 > worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 > kthread+0x405/0x4f0 kernel/kthread.c:327 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > </TASK> > > > --- > 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.
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