linux-kernel - next-20170217 boot on POWER8 LPAR : WARNING @kernel/jump

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Message-Id: <E6A8A7A8-6A55-4989-BAE9-39274876CA3C@linux.vnet.ibm.com>
Date:   Sun, 19 Feb 2017 19:37:43 +0530
From:   Sachin Sant <sachinp@...ux.vnet.ibm.com>
To:     linux-next@...r.kernel.org
Cc:     LKML <linux-kernel@...r.kernel.org>, linuxppc-dev@...abs.org,
        Michael Ellerman <mpe@...erman.id.au>, jbaron@...mai.com
Subject: next-20170217 boot on POWER8 LPAR : WARNING @kernel/jump_label.c:287

While booting next-20170217 on a POWER8 LPAR following
warning is displayed.

Reverting the following commit helps boot cleanly.
commit 3821fd35b5 :  jump_label: Reduce the size of struct static_key

[   11.393008] ------------[ cut here ]------------
[   11.393031] WARNING: CPU: 5 PID: 2890 at kernel/jump_label.c:287 static_key_set_entries.isra.10+0x3c/0x50
[   11.393035] Modules linked in: nfsd(+) ip_tables x_tables autofs4
[   11.393043] CPU: 5 PID: 2890 Comm: modprobe Not tainted 4.10.0-rc8-next-20170217-autotest #1
[   11.393047] task: c0000003a5692500 task.stack: c0000003a7774000
[   11.393051] NIP: c0000000017bcffc LR: c0000000017bd46c CTR: 0000000000000000
[   11.393054] REGS: c0000003a7777800 TRAP: 0700   Not tainted  (4.10.0-rc8-next-20170217-autotest)
[   11.393058] MSR: 800000000282b033 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE>
[   11.393065]   CR: 48248282  XER: 00000001
[   11.393070] CFAR: c0000000017bcfcc SOFTE: 1
GPR00: c0000000017bd42c c0000003a7777a80 c00000000262ce00 d000000003fdd580
GPR04: d000000003fe07df 0000000100000017 c0000000017bcd50 0000000000000000
GPR08: 0000000000053a09 0000000000000001 c00000000254ce00 0000000000000001
GPR12: c000000001b56c40 c00000000ea81400 0000000000000020 d000000005081098
GPR16: c0000003a7777da0 c0000003a7777dec 0000000000000000 00000000000084a8
GPR20: d000000003fef000 d000000003fe2b28 c00000000252dc90 0000000000000001
GPR24: c00000000254d314 0000000000000000 c0000000025338f8 d000000003fe089f
GPR28: 0000000000000000 d000000003fe1400 d000000003fdd578 d000000003fe07df
[   11.393115] NIP [c0000000017bcffc] static_key_set_entries.isra.10+0x3c/0x50
[   11.393119] LR [c0000000017bd46c] jump_label_module_notify+0x20c/0x420
[   11.393122] Call Trace:
[   11.393125] [c0000003a7777a80] [c0000000017bd42c] jump_label_module_notify+0x1cc/0x420 (unreliable)
[   11.393132] [c0000003a7777b40] [c0000000016b38e0] notifier_call_chain+0x90/0x100
[   11.393137] [c0000003a7777b90] [c0000000016b3db0] __blocking_notifier_call_chain+0x60/0x90
[   11.393142] [c0000003a7777be0] [c0000000017357bc] load_module+0x1c1c/0x2750
[   11.393147] [c0000003a7777d70] [c000000001736550] SyS_finit_module+0xc0/0xf0
[   11.393152] [c0000003a7777e30] [c0000000015cb8e0] system_call+0x38/0xfc
[   11.393156] Instruction dump:
[   11.393158] 40c20018 e9230000 792907a0 7c844b78 f8830000 4e800020 3d42fff2 892a0514
[   11.393166] 2f890000 40feffe0 39200001 992a0514 <0fe00000> 4bffffd0 60000000 60000000
[   11.393173] ---[ end trace a5f8fbc5d8226aec ]---

Have attached boot log.

Thanks
-Sachin
Download attachment "dmesg_next_20170217.log" of type "application/octet-stream" (28925 bytes)