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MHZneWRPMUJtNk11OTZQOXVmbEtaY0FTNndtTE01SWRIT3lqTDg4d0h3anVjakFPQnRjdwpw MG9HVG5WT25Sc05ZU084VzhZWi9LZGJ1Nzg1ZGF6TXFKMmlOakFEdUJiZG02TjRqNUVkTW5r TG4wQklmUEpwCmRnbTR2bDJVcExqd1JHci9NM3dtbTVwdnMrNnVCN2hrL0ZKaUQvNGxsRU5Q NGVNMWg3U200aitWcTZOMSt6VEIKSVhKQWViSXFhc0RwNXlaUzdYcnk0STM2bjg1WEVZZkcw MWx0QXlob05WMkRPOFNJUlFwdWkydHErOVJQM1JLMQpKREJ4eEVKWTJFTzVKWjhNeGFQSFEw RFQwNWxSRmpLMkFsaGRFSXRqTGpwSjNmVW05c3FMeE1XeHpQNlV6M2lpCjJ1YTR1bnJ0Nk9D VHFRd2lqRi8zYlRXaXd2VkFBSG5NRlVpb1hzaEhhb2hWRGNWZm5lSU1mVjBiUUNYWWkzTnAK WTB2MFp3Y2lGSCtnU0M3cUQ2WE51aHBWR1NMNElpbGlGeS9TemNhSkV6QUhlTERTaFpQMkNX ZG5DNHZnbDM3dApocHg4aDU1WWhKbjZIU3VVelBnaGFLdFZCMmsrajdaZXlaK1NGeHA3SXVi SEN3TEhsUWhUNzVSd1EzaUF4S242CjBxajUxY1lUbnF4ZFpYVzZmSDNQa3VNellVNUdwcVIv MU9sNWMvd2ZJNmc2QW04eUtXLzBFVUx0K0tuNExGc1MKbTdZM201SDV2MTJVNkpCWXZWK3Ix M2paaW9zNEVFREU5M0Q1c05IMk1JeVJ6Q0RxMXpkZHQ0WHV5S0ZqUEtXMQo5aWJaRGZGVjdL dUNzdnVMMjNzQmMxc0NNb3ArRTFtVC9ReE9JQTZvRFQxTVFzdHdPVnVReURDdi9PdktTZ2Z6 CjhGWEdMNkFQY2xqQ3FqOEFKaHhReXN4ZG9pUVA4bS92dStialdHR3Z4dzVzMWxncGlSRFRS VVBnY0pKTmFHWTIKVklEclpRaTROU2lOUTBOSWkrZGp1NGZOTW1DcFFxZzh0YkMzY0FhNnl3 bTZvUUIxU0JobURYMmUxMWdSbGx1SQpPblRHUEUwSFRvM2w3MmxoYmc9PQo9cVpNVgotLS0t LUVORCBQR1AgUFVCTElDIEtFWSBCTE9DSy0tLS0tCg== To: Tejun Heo , Li Zefan , Johannes Weiner Cc: cgroups@vger.kernel.org, open list Message-ID: Date: Wed, 16 Sep 2020 08:58:49 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT Content-Language: en-US X-Provags-ID: V03:K1:McBaR6h475f+03AsHcDzrOtYImqqW512bfeOU5VDEZyQ/04/BWo n/mG2/TQWziVupQNfSNhRnaSv3Ki16v4xvh9NIw4/78v0jwRq952tWNWDHNSUKNbaeYpDLJ CAbakkD0tQYBQT39jQN7BOqGWLK15GGfsZ6tUgtP4dgKWd+3dYFv2DfwLwmuBA+7ONZUYbB C8y8F+bCTTRKqAlOrN1Ww== X-UI-Out-Filterresults: notjunk:1;V03:K0:MR/8TKoEpSo=:4hW2YDfBOIEk/YTsJyx3Ad ah6s+1VCY5+Yt78QOMshlNuCLNr/zVaDmVUFv5qRVDmTZpBBWo2colAi2TbEc17lvVrLPRRpi iXGdQESRREOHXDb5zBeQG9O3Ao2DzSTkcc8S4Y3SSQv2XyUjABxHtf9lzWYBt+hyYyb7JsvAu AJUqE5QMv2uevCww94wZcBkw4cB107GMhV+Ky0vV1CeAAtxl5s+pjy1d+hkBrTy85I9dVxCk6 S6T53qvCyRoSivcFznzqUtKF692jxOX3V3fNu21+UlsVO2bpQyqCVqa5gk6eUH6GIA3v+knJK vOlmxozWarhkSh4yVNrCG6uud6x6jHMv/vQg3ga97uxHKp/Z8JTz2dsPfqgttPsG1SSSGsqdg KS3plcr1tCqgPWpTnnATJVO4L2c24eZbSfUHaML8BsR6YO9clEHXcKQeXXu4f+RVkVJoh/F1x 65fUgM0EXJ6x0xnl9lrfZ4DXg1wFlso4cBYArDLYGangS4ZKbJI45aE/HNJeamx+xpgRxmxgB KMfwI6v84YHSdcFAbMRG/eICeFMclx+yOg0cucmA3wQSRXqdqxaOTMP3FZC+8qA/XQuUEwVnC /nvQmx38DujFSvms1isi+1+b2uC5syP/t3N4yd2jNYfd8aJF0pmGtM3QZNzrLdwaQeaoGz/71 D4jAMkxqgm4eS20M9QnnDYsaLN2eoDntIXG+4h2fEBobAsImcc873KK7J3lt4NHSY/i6kXraA /bsYLcR59HMl2TSowmhMHzk1EGHbwm2L/EzWpa/CWKgGcfcPS5Jqom0xIwmiC5I8KNoxFT0e1 mGHP4+HjFdSjdDHR5on4tPjL30f7rLDm0dCBn+UvN1dxMfcbkysQSini4wEFFSm48zcZYTX Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, i noticed a regular crash (NULL pointer dereference) on my ARM i.MX28 board using the current mainline kernel (last tested version Linux 5.9-rc5). I also tested Linux 5.8, but i wasn't able to reproduce with this version, so i assume this is a regression. The crash happens mostly short after boot or during shutdown. Unfortunately i don't have a specific scenario to trigger this issue. The issue was reproducable with arm/mxs_defconfig. Here is the crash output: [   58.670665] 8<--- cut here --- [   58.673844] Unable to handle kernel NULL pointer dereference at virtual address 000002c0 [   58.682130] pgd = aa9080fa [   58.684863] [000002c0] *pgd=00000000 [   58.688467] Internal error: Oops: 5 [#1] ARM [   58.692743] Modules linked in: [   58.695826] CPU: 0 PID: 41 Comm: kworker/0:2 Not tainted 5.9.0-rc5-00009-g9d3c35e #15 [   58.703660] Hardware name: Freescale MXS (Device Tree) [   58.708830] Workqueue: cgroup_destroy css_free_rwork_fn [   58.714089] PC is at kernfs_put+0xb8/0x1c4 [   58.718195] LR is at 0xc6f4c7c0 [   58.721342] pc : []    lr : []    psr: 00000013 [   58.727614] sp : c7787ed0  ip : 60000013  fp : c6f47a10 [   58.732843] r10: c6f4c9c0  r9 : c0ae95fc  r8 : c0ae95f8 [   58.738072] r7 : c74249c8  r6 : c6f486e0  r5 : c670b898  r4 : 000002c0 [   58.744603] r3 : 00000000  r2 : 00000001  r1 : 00000001  r0 : c7ee4030 [   58.751138] Flags: nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none [   58.758280] Control: 0005317f  Table: 44d18000  DAC: 00000053 [   58.764043] Process kworker/0:2 (pid: 41, stack limit = 0x6fb11f96) [   58.770322] Stack: (0xc7787ed0 to 0xc7788000) [   58.774697] 7ec0:                                     60000013 c0ae2664 c7ee4d00 00000000 [   58.782896] 7ee0: c653b800 c74249c0 c0ab2df4 c653b864 00000000 c653b800 c7ee4d00 00000000 [   58.791096] 7f00: 00000000 c653b868 c0ab2df4 c0083574 c653b864 c773d720 00000000 c7ee4d00 [   58.799295] 7f20: 00000000 c00309e8 c0a21370 c7786000 c0a28fa0 c773d720 c0a2135c c773d734 [   58.807493] 7f40: c0a21370 c7786000 c0a28fa0 00000008 c0a2135c c0031158 c773d720 c7497eb8 [   58.815693] 7f60: c7787f7c c778c100 c7781200 00000000 c7786000 c0031108 c773d720 c7497eb8 [   58.823890] 7f80: c778c120 c00371d4 60000013 c7781200 c00370dc 00000000 00000000 00000000 [   58.832087] 7fa0: 00000000 00000000 00000000 c0008540 00000000 00000000 00000000 00000000 [   58.840282] 7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [   58.848478] 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000 [   58.856698] [] (kernfs_put) from [] (css_free_rwork_fn+0x19c/0x3ac) [   58.864739] [] (css_free_rwork_fn) from [] (process_one_work+0x14c/0x4d4) [   58.873293] [] (process_one_work) from [] (worker_thread+0x50/0x590) [   58.881421] [] (worker_thread) from [] (kthread+0xf8/0x134) [   58.888764] [] (kthread) from [] (ret_from_fork+0x14/0x34) [   58.895996] Exception stack(0xc7787fb0 to 0xc7787ff8) [   58.901062] 7fa0:                                     00000000 00000000 00000000 00000000 [   58.909259] 7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [   58.917452] 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000 [   58.924088] Code: ebfdce1f e1a0000a ebfce9aa e154000b (e5943000) [   58.930410] ---[ end trace 73455566ad3e0105 ]---