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Date: Thu, 13 Aug 2020 16:46:54 +1000
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Roman Gushchin <guro@...com>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Johannes Weiner <hannes@...xchg.org>,
Linux Next Mailing List <linux-next@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux PowerPC Mailing List <linuxppc-dev@...ts.ozlabs.org>
Subject: linux-next: runtime warning in Linus' tree
Hi all,
Testing Linus' tree today, my qemu runs (PowerPC
powerpc_pseries_le_defconfig) produce the following WARNING:
[ 0.021401][ T0] Mount-cache hash table entries: 8192 (order: 0, 65536 bytes, linear)
[ 0.021529][ T0] Mountpoint-cache hash table entries: 8192 (order: 0, 65536 bytes, linear)
[ 0.053969][ T0] ------------[ cut here ]------------
[ 0.055220][ T0] WARNING: CPU: 0 PID: 0 at mm/memcontrol.c:5220 mem_cgroup_css_alloc+0x350/0x904
[ 0.055355][ T0] Modules linked in:
[ 0.055812][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.8.0 #5
[ 0.055976][ T0] NIP: c000000000410010 LR: c00000000040fd68 CTR: 0000000000000000
[ 0.056097][ T0] REGS: c0000000011e7ab0 TRAP: 0700 Not tainted (5.8.0)
[ 0.056162][ T0] MSR: 8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 24000888 XER: 00000000
[ 0.056449][ T0] CFAR: c00000000040fd80 IRQMASK: 0
[ 0.056449][ T0] GPR00: c00000000040fd68 c0000000011e7d40 c0000000011e8300 0000000000000001
[ 0.056449][ T0] GPR04: 0000000000000228 0000000000000000 0000000000000001 ffffffffffffffff
[ 0.056449][ T0] GPR08: c00000007d003208 0000000000000000 0000000000000000 c00000007d002fe8
[ 0.056449][ T0] GPR12: 0000000000000001 c0000000013d0000 0000000000000000 00000000011dd528
[ 0.056449][ T0] GPR16: 00000000011dd840 00000000011dd690 0000000000000018 0000000000000003
[ 0.056449][ T0] GPR20: 0000000000000001 c0000000010cbcf8 0000000000000003 c0000000010cd540
[ 0.056449][ T0] GPR24: c0000000010e8778 c0000000010e9080 c0000000010cbcd8 0000000000000000
[ 0.056449][ T0] GPR28: 0000000000000000 c00000007e2a1000 c0000000010cbcc8 c00000000118ea00
[ 0.057109][ T0] NIP [c000000000410010] mem_cgroup_css_alloc+0x350/0x904
[ 0.057177][ T0] LR [c00000000040fd68] mem_cgroup_css_alloc+0xa8/0x904
[ 0.057394][ T0] Call Trace:
[ 0.057534][ T0] [c0000000011e7d40] [c00000000040fd68] mem_cgroup_css_alloc+0xa8/0x904 (unreliable)
[ 0.057814][ T0] [c0000000011e7dc0] [c000000000f5b13c] cgroup_init_subsys+0xbc/0x210
[ 0.057903][ T0] [c0000000011e7e10] [c000000000f5b690] cgroup_init+0x220/0x598
[ 0.057973][ T0] [c0000000011e7ee0] [c000000000f34354] start_kernel+0x67c/0x6ec
[ 0.058047][ T0] [c0000000011e7f90] [c00000000000cb88] start_here_common+0x1c/0x614
[ 0.058241][ T0] Instruction dump:
[ 0.058420][ T0] eac10030 eae10038 eb410050 eb610058 4bffff60 60000000 60000000 60000000
[ 0.058550][ T0] 3be00100 4bfffdfc 60000000 60000000 <0fe00000> 4bfffd70 60000000 60000000
[ 0.059381][ T0] ---[ end trace cb2d79b4994ef1fe ]---
[ 0.059810][ T0] ------------[ cut here ]------------
[ 0.059872][ T0] WARNING: CPU: 0 PID: 0 at mm/memcontrol.c:5135 mem_cgroup_css_alloc+0x750/0x904
[ 0.059930][ T0] Modules linked in:
[ 0.060053][ T0] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 5.8.0 #5
[ 0.060113][ T0] NIP: c000000000410410 LR: c00000000040ff2c CTR: 0000000000000000
[ 0.060171][ T0] REGS: c0000000011e7ab0 TRAP: 0700 Tainted: G W (5.8.0)
[ 0.060229][ T0] MSR: 8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 24000880 XER: 00000000
[ 0.060332][ T0] CFAR: c00000000040fe48 IRQMASK: 0
[ 0.060332][ T0] GPR00: c00000000040ff2c c0000000011e7d40 c0000000011e8300 c00000007e234c00
[ 0.060332][ T0] GPR04: 0000000000000000 0000000000000000 c00000007e235000 0000000000000013
[ 0.060332][ T0] GPR08: 000000007ec00000 0000000000000000 0000000000000000 0000000000000001
[ 0.060332][ T0] GPR12: 0000000000000000 c0000000013d0000 0000000000000000 00000000011dd528
[ 0.060332][ T0] GPR16: 00000000011dd840 00000000011dd690 0000000000000018 0000000000000003
[ 0.060332][ T0] GPR20: c000000001223300 c000000000e95900 c00000000118ea00 c0000000012232c0
[ 0.060332][ T0] GPR24: c0000000010e8778 c0000000010e9080 0000000000400cc0 0000000000000000
[ 0.060332][ T0] GPR28: 0000000000000000 c00000007e2a1000 c00000007e234c00 0000000000000000
[ 0.060855][ T0] NIP [c000000000410410] mem_cgroup_css_alloc+0x750/0x904
[ 0.060911][ T0] LR [c00000000040ff2c] mem_cgroup_css_alloc+0x26c/0x904
[ 0.060958][ T0] Call Trace:
[ 0.061003][ T0] [c0000000011e7d40] [c00000000040ff2c] mem_cgroup_css_alloc+0x26c/0x904 (unreliable)
[ 0.061081][ T0] [c0000000011e7dc0] [c000000000f5b13c] cgroup_init_subsys+0xbc/0x210
[ 0.061165][ T0] [c0000000011e7e10] [c000000000f5b690] cgroup_init+0x220/0x598
[ 0.061233][ T0] [c0000000011e7ee0] [c000000000f34354] start_kernel+0x67c/0x6ec
[ 0.061303][ T0] [c0000000011e7f90] [c00000000000cb88] start_here_common+0x1c/0x614
[ 0.061364][ T0] Instruction dump:
[ 0.061408][ T0] ebe1fff8 7c0803a6 4e800020 60000000 60000000 3d220004 e929d230 7c3c4800
[ 0.061508][ T0] 41820190 e93c03d2 4bfffc80 60000000 <0fe00000> 4bfffa38 60000000 60000000
[ 0.061630][ T0] ---[ end trace cb2d79b4994ef1ff ]---
[ 0.096387][ T1] EEH: pSeries platform initialized
[ 0.097232][ T1] POWER8 performance monitor hardware support registered
[The line numbers in the final linux next are 5226 and 5141 due to
later patches.]
Introduced (or exposed) by commit
3e38e0aaca9e ("mm: memcg: charge memcg percpu memory to the parent cgroup")
This commit actually adds the WARN_ON, so it either adds the bug that
sets it off, or the bug already existed.
Unfotunately, the version of this patch in linux-next up tuntil today
is different. :-(
I have left this as I have no idea how to fix it :-)
--
Cheers,
Stephen Rothwell
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