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1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) Subject: [PowerPC][next-20190603] WARNING: at kernel/fork.c:721 Date: Tue, 4 Jun 2019 14:54:51 +0530 To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org X-Mailer: Apple Mail (2.3445.104.11) X-TM-AS-GCONF: 00 x-cbid: 19060409-0012-0000-0000-00000322F38A X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19060409-0013-0000-0000-0000215BD195 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-06-04_07:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=607 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906040062 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-next@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" While booting linux-next [20190603] on a POWER9 LPAR ran into following warning [ 9.002935] WARNING: CPU: 0 PID: 1 at kernel/fork.c:721 = __put_task_struct+0x34/0x170 [ 9.002947] Modules linked in: dm_mirror dm_region_hash dm_log dm_mod [ 9.002960] CPU: 0 PID: 1 Comm: systemd Not tainted = 5.2.0-rc3-next-20190603-autotest #1 [ 9.002971] NIP: c0000000001191e4 LR: c00000000020c53c CTR: = 0000000000000000 [ 9.002980] REGS: c0000008b2783810 TRAP: 0700 Not tainted = (5.2.0-rc3-next-20190603-autotest) [ 9.002990] MSR: 8000000000029033 CR: = 24222842 XER: 20040000 [ 9.003004] CFAR: c00000000020c538 IRQMASK: 0=20 [ 9.003004] GPR00: c00000000020c53c c0000008b2783aa0 c00000000138ca00 = c0000008b92e19f8=20 [ 9.003004] GPR04: c0000008b2783b98 c0000008b2783b98 c0000008b92e24b0 = 0000000000000000=20 [ 9.003004] GPR08: 0000000000000000 0000000000000001 0000000000000000 = c000000000a81060=20 [ 9.003004] GPR12: 0000000024224842 c0000000017c0000 0000000000000000 = 0000000000000000=20 [ 9.003004] GPR16: 0000000000000000 0000000000000000 0000000000000000 = 0000000000000001=20 [ 9.003004] GPR20: 0000000000000000 00007fff95f90000 c0000008b2756dc0 = c0000008b2783df0=20 [ 9.003004] GPR24: 0000000000002000 c0000008ad74d200 c0000008b926a218 = 0000000000000000=20 [ 9.003004] GPR28: c0000008b92e1400 0000000000000000 0000000000000000 = c0000008b92e19f8=20 [ 9.003083] NIP [c0000000001191e4] __put_task_struct+0x34/0x170 [ 9.003094] LR [c00000000020c53c] css_task_iter_end+0x11c/0x1b0 [ 9.003101] Call Trace: [ 9.003108] [c0000008b2783aa0] [c0000008b92e1400] 0xc0000008b92e1400 = (unreliable) [ 9.003119] [c0000008b2783ad0] [c00000000020c53c] = css_task_iter_end+0x11c/0x1b0 [ 9.003129] [c0000008b2783b10] [c00000000020f60c] = pidlist_array_load+0x12c/0x390 [ 9.003140] [c0000008b2783bf0] [c00000000020fa20] = cgroup_pidlist_start+0x1b0/0x1e0 [ 9.003151] [c0000008b2783c40] [c0000000001ffd98] = cgroup_seqfile_start+0x38/0x50 [ 9.003163] [c0000008b2783c60] [c00000000049c270] = kernfs_seq_start+0x80/0x120 [ 9.003175] [c0000008b2783ca0] [c0000000003fea08] = seq_read+0x208/0x540 [ 9.003184] [c0000008b2783d20] [c00000000049cdd4] = kernfs_fop_read+0x1a4/0x260 [ 9.003196] [c0000008b2783d70] [c0000000003c3cec] = __vfs_read+0x3c/0x70 [ 9.003205] [c0000008b2783d90] [c0000000003c3dd4] vfs_read+0xb4/0x1b0 [ 9.003214] [c0000008b2783dd0] [c0000000003c42bc] = ksys_read+0x7c/0x130 [ 9.003224] [c0000008b2783e20] [c00000000000b688] = system_call+0x5c/0x70 [ 9.003232] Instruction dump: [ 9.003237] 38423850 7c0802a6 60000000 7c0802a6 fbc1fff0 fbe1fff8 = f8010010 f821ffd1=20 [ 9.003251] 7c7f1b78 8123067c 7d290034 5529d97e <0b090000> 81230110 = 7d290034 5529d97e=20 [ 9.003264] ---[ end trace 2194bb4cf2567482 ]=E2=80=94 Have not seen this warning previously and is new with this next build. void __put_task_struct(struct task_struct *tsk) { WARN_ON(!tsk->exit_state); <<=3D=3D=20 WARN_ON(refcount_read(&tsk->usage)); Since I am running into various boot failures with next tree for last = week or so am not able to bisect. Thanks -Sachin=