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Mon, 1 Oct 2018 19:21:23 +0000 From: Roman Gushchin To: Alexei Starovoitov CC: "syzbot+18628320d3b14a5c459c@syzkaller.appspotmail.com" , Alexei Starovoitov , Daniel Borkmann , LKML , Network Development , syzkaller-bugs Subject: Re: WARNING in pcpu_alloc Thread-Topic: WARNING in pcpu_alloc Thread-Index: AQHUWbP7s66ewJiSa0SppKFj5uwleKUKxHjk Date: Mon, 1 Oct 2018 19:21:22 +0000 Message-ID: <3C215C12-D2EB-4A3D-B2F0-7A27875B8061@fb.com> References: <000000000000357da505772ec5ad@google.com>, In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [107.77.211.19] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;BY2PR15MB0759;20:SoN1f1ylpMo1M8IXeipSnOYU3x92TWFZvlKYVl6+s5zHfCe1OS0oHqcyy1xWGrT73Ga28snce43h+jUlnWYypD+sxS+AzwqhH5hn2oNCMx4mcPcpycakLbiXWUASLE6p2Pq6x/dZujc6hHFWrkTuEUuBEfxK8KcUj/3K3FzOWGY= x-ms-exchange-antispam-srfa-diagnostics: SOS; x-ms-office365-filtering-correlation-id: 420211cd-ac1a-4dc2-75c6-08d627d31309 x-microsoft-antispam: BCL:0;PCL:0;RULEID:(7020095)(4652040)(8989299)(4534165)(4627221)(201703031133081)(201702281549075)(8990200)(5600074)(711020)(2017052603328)(7153060)(7193020);SRVR:BY2PR15MB0759; 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Thanks! Sent from my iPhone > On Oct 1, 2018, at 20:24, Alexei Starovoitov wrote: >=20 > On Mon, Oct 1, 2018 at 6:14 PM syzbot > wrote: >>=20 >> Hello, >>=20 >> syzbot found the following crash on: >>=20 >> HEAD commit: c5a9f9817ba5 Merge branch 'bpf-per-cpu-cgroup-local-stor= age' >> git tree: bpf-next >> console output: https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__s= yzkaller.appspot.com_x_log.txt-3Fx-3D175f98e6400000&d=3DDwIBaQ&c=3D5VD0RTtN= lTh3ycd41b3MUw&r=3DjJYgtDM7QT-W-Fz_d29HYQ&m=3DRDq5scOAUEmnSy8tXTh8WldgNIIBk= pJow65eBMO1X78&s=3D1gv4CbD91yt2XHXTnOVUyGN15DqWWFz3xYlo9ioGZEw&e=3D >> kernel config: https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__s= yzkaller.appspot.com_x_.config-3Fx-3D443816db871edd66&d=3DDwIBaQ&c=3D5VD0RT= tNlTh3ycd41b3MUw&r=3DjJYgtDM7QT-W-Fz_d29HYQ&m=3DRDq5scOAUEmnSy8tXTh8WldgNII= BkpJow65eBMO1X78&s=3DEdREqNHdZup-52h5rZo0Mq59K3DYw1YVizBexkGikEk&e=3D >> dashboard link: https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__s= yzkaller.appspot.com_bug-3Fextid-3D18628320d3b14a5c459c&d=3DDwIBaQ&c=3D5VD0= RTtNlTh3ycd41b3MUw&r=3DjJYgtDM7QT-W-Fz_d29HYQ&m=3DRDq5scOAUEmnSy8tXTh8WldgN= IIBkpJow65eBMO1X78&s=3DQlmeF_tfsUIhzLLRKSwcR5ruQyqZA5wqow5kw_BRA6o&e=3D >> compiler: gcc (GCC) 8.0.1 20180413 (experimental) >> syz repro: https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__s= yzkaller.appspot.com_x_repro.syz-3Fx-3D129cbd1a400000&d=3DDwIBaQ&c=3D5VD0RT= tNlTh3ycd41b3MUw&r=3DjJYgtDM7QT-W-Fz_d29HYQ&m=3DRDq5scOAUEmnSy8tXTh8WldgNII= BkpJow65eBMO1X78&s=3DVDTRxfcVTxFp9LiiLsUYKevDzawNsYjRuqMHAZ7an2c&e=3D >> C reproducer: https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__s= yzkaller.appspot.com_x_repro.c-3Fx-3D16685ac9400000&d=3DDwIBaQ&c=3D5VD0RTtN= lTh3ycd41b3MUw&r=3DjJYgtDM7QT-W-Fz_d29HYQ&m=3DRDq5scOAUEmnSy8tXTh8WldgNIIBk= pJow65eBMO1X78&s=3DPIFdU3kSa5SEp7k0bav9JxpLGyBiPz84uRE25vyl5_0&e=3D >>=20 >> IMPORTANT: if you fix the bug, please add the following tag to the commi= t: >> Reported-by: syzbot+18628320d3b14a5c459c@syzkaller.appspotmail.com >>=20 >> ------------[ cut here ]------------ >> illegal size (0) or align (8) for percpu allocation >=20 > Roman, >=20 > looks like > if (attr->value_size > PAGE_SIZE) > return ERR_PTR(-E2BIG); > is not enough, since value_size=3D=3D0 needs to be rejected as well. > Could you prepare a patch?