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Date: Thu, 19 Apr 2018 09:56:08 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
akpm@...ux-foundation.org, linux@...ck-us.net,
shuahkh@....samsung.com, patches@...nelci.org,
ben.hutchings@...ethink.co.uk, lkft-triage@...ts.linaro.org,
stable@...r.kernel.org, Ka-Cheong Poon <ka-cheong.poon@...cle.com>,
Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH 4.9 00/66] 4.9.95-stable review
On Wed, Apr 18, 2018 at 12:42:44PM -0500, Dan Rue wrote:
> On Tue, Apr 17, 2018 at 05:58:33PM +0200, Greg Kroah-Hartman wrote:
> > This is the start of the stable review cycle for the 4.9.95 release.
> > There are 66 patches in this series, all will be posted as a response
> > to this one. If anyone has any issues with these being applied, please
> > let me know.
> >
> > Responses should be made by Thu Apr 19 15:56:27 UTC 2018.
> > Anything received after that time might be too late.
> >
> > The whole patch series can be found in one patch at:
> > https://www.kernel.org/pub/linux/kernel/v4.x/stable-review/patch-4.9.95-rc1.gz
> > or in the git tree and branch at:
> > git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.9.y
> > and the diffstat can be found below.
>
> We've noticed a regression on arm32 in sendto() and send() system calls,
> causing them to hang forever.
>
> The easiest way we have found to reproduce, is to simply run 'ip link'.
> When running 'strace -T ip link' we see:
>
> ...
> getsockname(3, {sa_family=AF_NETLINK, nl_pid=364, nl_groups=00000000}, [12]) = 0 <0.000079>
> .... long wait (10 minute) and then eventually:
> send(3, {{len=40, type=0x12 /* NLMSG_??? */, flags=NLM_F_REQUEST|0x300, seq=1522961259, pid=0}, \"\21\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\10\0\35\0\1\0\0\0\"}, 40, 0[ 807.868633] random: crng init done
>
> Ignore the 'random: crng init done' - I believe it is causing the dmesg
> buffer to print which is what gets us our send() output.
>
> We saw a similar strace hang on sendto() with the ltp 'gethostid01' test.
>
> We've also observed the following kernel log during boot on the x15/arm32
> device:
>
> [ 13.555030] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
> [ 13.580352] net eth0: initializing cpsw version 1.15 (0)
> [ 13.708220] Unable to handle kernel NULL pointer dereference at virtual address 00000008
> [ 13.716375] pgd = ed724f40
> [ 13.719126] [00000008] *pgd=ac173003, *pmd=fb03d003
> [ 13.724068] Internal error: Oops: 207 [#1] SMP ARM
> [ 13.728882] Modules linked in: snd_soc_simple_card snd_soc_simple_card_utils snd_soc_core snd_pcm_dmaengine snd_pcm snd_timer snd soundcore ac97_bus
> [ 13.742337] CPU: 0 PID: 243 Comm: NetworkManager Not tainted 4.9.95-rc1 #1
> [ 13.749241] Hardware name: Generic DRA74X (Flattened Device Tree)
> [ 13.755360] task: ed6a6e40 task.stack: ec114000
> [ 13.759916] PC is at kszphy_config_reset+0x1c/0x150
> [ 13.764815] LR is at kszphy_resume+0x24/0x64
> [ 13.769104] pc : [<c0b6f680>] lr : [<c0b6f940>] psr: 600e0113
> [ 13.769104] sp : ec115920 ip : ec115940 fp : ec11593c
> [ 13.780630] r10: 00000000 r9 : 00000007 r8 : 00000000
> [ 13.785877] r7 : ed049800 r6 : 00000000 r5 : ee1d3800 r4 : ed049c00
> [ 13.792431] r3 : 00000001 r2 : 00000000 r1 : 00000110 r0 : ed049c00
> [ 13.798987] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
> [ 13.806152] Control: 30c5387d Table: ad724f40 DAC: fffffffd
> [ 13.811923] Process NetworkManager (pid: 243, stack limit = 0xec114220)
> [ 13.818564] Stack: (0xec115920 to 0xec116000)
> [ 13.822941] 5920: ed049c00 ee1d3800 00000000 ed049800 ec115954 ec115940 c0b6f940 c0b6f670
> [ 13.831154] 5940: ed049c00 ee1d3800 ec115984 ec115958 c0b693f8 c0b6f928 00000007 ed049c00
> [ 13.839368] 5960: ed049c00 c0c11cec c0c11cec 00000007 ee1d3e0c 00000000 ec1159a4 ec115988
> [ 13.847582] 5980: c0b69600 c0b69340 ee6af854 ed049c00 ee1d3800 c0c11cec ec1159cc ec1159a8
> [ 13.855795] 59a0: c0b6968c c0b695e8 ed040310 ee1d3e00 00000000 ee4fbc10 ee4fbc10 ee1d3e0c
> [ 13.864009] 59c0: ec115a04 ec1159d0 c0c0e47c c0b69644 00000001 00000000 c04d5160 ee4fbc10
> [ 13.872222] 59e0: ee1d3e00 ee1d3800 ee4fbc10 00000000 00000001 ed3aad80 ec115aa4 ec115a08
> [ 13.880436] 5a00: c0c11634 c0c0e258 00000000 c0476cec c0ef92e0 c0476cec c0df67b8 fffffff4
> [ 13.888647] 5a20: ec115aac fffffff3 ec115aac 0000000d 00000000 00000000 ec115a6c ec115a48
> [ 13.896861] 5a40: c0476cec c0eba8ac ec115aac 0000000d ee1d3800 00001002 00000000 ed5a7810
> [ 13.905074] 5a60: ec115a84 ec115a70 c0476ed0 c0476ca4 00000000 c0de20fc ec115aa4 ee1d3800
> [ 13.913287] 5a80: 00000000 c1193410 ee1d3830 00000000 ed5a7810 ed3aad80 ec115acc ec115aa8
> [ 13.921500] 5aa0: c0deeb64 c0c1118c ec115acc ee1d3800 ee1d3800 00001003 00000001 00001002
> [ 13.929713] 5ac0: ec115af4 ec115ad0 c0deee4c c0deeab4 ee1d3800 00001002 00000000 ee1d394c
> [ 13.937925] 5ae0: 00000000 ed5a7810 ec115b1c ec115af8 c0deef24 c0deedb4 ee1d3800 ec115c28
> [ 13.946137] 5b00: 00000000 c1193410 00000000 ed5a7810 ec115b8c ec115b20 c0e025f0 c0deef08
> [ 13.954351] 5b20: c0491510 c04aa8d4 00000000 ec115b38 00000000 00000003 00000000 00000000
> [ 13.962563] 5b40: 00000000 c230d40c ed6a7338 00000001 00000002 c1a58e78 c1a80870 ed6a6e40
> [ 13.970775] 5b60: ec115bfc 00000000 ee1d3800 00000000 00000000 00000000 00000000 ed5a7800
> [ 13.978988] 5b80: ec115d04 ec115b90 c0e04554 c0e0230c ec115bc4 00000000 ed3aad80 c11cb12c
> [ 13.987202] 5ba0: ed5a7820 c1b68b40 00000000 c1b69b50 ec115b90 ed5a7810 ec115c54 ec115bc8
> [ 13.995416] 5bc0: c04adef0 c04acd00 ec115c64 ec115bd8 c04adef0 00000000 00000000 00000000
> [ 14.003629] 5be0: 00000000 00000000 00000000 c230d400 ed6a7318 00000000 00000001 c230d40c
> [ 14.011842] 5c00: ed6a72f8 00000001 00000000 c1b69b84 c1a80870 ed6a6e40 ec115cb4 ec115c28
> [ 14.020054] 5c20: c04adef0 c04acdd4 00000000 00000000 00000000 00000000 00000000 00000000
> [ 14.028266] 5c40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> [ 14.036479] 5c60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> [ 14.044691] 5c80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> [ 14.052903] 5ca0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> [ 14.061115] 5cc0: 00000000 00000000 00000000 00000000 00000000 00000000 c0e194b0 c0e040a4
> [ 14.069328] 5ce0: ed5a7800 c236d9e4 ed3aad80 ec115d84 00000000 00000000 ec115d44 ec115d08
> [ 14.077540] 5d00: c0e04908 c0e040b0 c0f458a8 c04ad82c 00000001 00000000 c0e01c0c 00000000
> [ 14.085753] 5d20: ed5a7800 c0e04828 ed3aad80 ed3aad80 ec115d84 00000000 ec115d64 ec115d48
> [ 14.093966] 5d40: c0e1e538 c0e04834 ed3aad80 ec212000 00000020 ed3aad80 ec115d7c ec115d68
> [ 14.102179] 5d60: c0e01c1c c0e1e494 ee2f0400 ec212000 ec115dac ec115d80 c0e1de70 c0e01bf0
> [ 14.110391] 5d80: ec115e24 7fffffff ec115f48 ec212000 ed3aad80 00000000 00000020 00000000
> [ 14.118603] 5da0: ec115e0c ec115db0 c0e1e29c c0e1dcfc ec115e24 ec115e48 0000000c 00000001
> [ 14.126817] 5dc0: be8be8b4 00000008 00000000 ed73bd00 00000000 000000f3 00000000 00000000
> [ 14.135031] 5de0: ec115e24 ec115f48 00000000 00000000 eddf6d80 ec115e28 00000000 00000000
> [ 14.143244] 5e00: ec115e1c ec115e10 c0dc8304 c0e1dfe4 ec115f34 ec115e20 c0dc8a70 c0dc82ec
> [ 14.151457] 5e20: ec115e84 00000000 c04afaa8 c04adb9c 00000001 00000000 600b0013 c1b7a9a4
> [ 14.159670] 5e40: 00000001 c1a4405c 001fa4f0 00000020 c04b00cc c04c87a0 c04afaa8 c04adb9c
> [ 14.167884] 5e60: 00000000 00000000 ffffe000 00000000 600b0013 00004000 00000000 c05fed1c
> [ 14.176097] 5e80: 600b0013 c04aa828 00000010 00000000 00000000 00000008 00004000 ed45ea00
> [ 14.184308] 5ea0: c1b79b7b c13c1e6c ec115efc ec115eb8 c05fed48 c04afc5c 00000000 00000000
> [ 14.192522] 5ec0: c05febb8 ec115ed0 c13e1ce0 ed45ea90 00000000 ec115f44 ec115f40 00000008
> [ 14.200735] 5ee0: 00000128 c0408e04 ec114000 00000000 ec115f0c ec115f00 c05fee84 c05febc4
> [ 14.208949] 5f00: ec115f1c ec115f10 c05fef04 be8be89c 00000000 eddf6d80 00000128 c0408e04
> [ 14.217162] 5f20: ec114000 00000000 ec115f94 ec115f38 c0dc9884 c0dc889c 00000000 00000000
> [ 14.225375] 5f40: 00000001 fffffff7 ec115e88 0000000c 00000001 00000000 00000000 ec115e50
> [ 14.233588] 5f60: 00000000 00000006 00000000 00000000 00000000 00000000 ec115f94 00000000
> [ 14.241801] 5f80: be8be89c 00000008 ec115fa4 ec115f98 c0dc98c8 c0dc9840 00000000 ec115fa8
> [ 14.250013] 5fa0: c0408c80 c0dc98bc 00000000 be8be89c 00000008 be8be89c 00000000 00000000
> [ 14.258225] 5fc0: 00000000 be8be89c 00000008 00000128 b69d9390 be8be900 00000000 001a93e0
> [ 14.266438] 5fe0: b6f316e0 be8be840 00000000 b699a4a4 800b0010 00000008 00000000 00000000
> [ 14.274661] [<c0b6f680>] (kszphy_config_reset) from [<c0b6f940>] (kszphy_resume+0x24/0x64)
> [ 14.282966] [<c0b6f940>] (kszphy_resume) from [<c0b693f8>] (phy_attach_direct+0xc4/0x1cc)
> [ 14.291183] [<c0b693f8>] (phy_attach_direct) from [<c0b69600>] (phy_connect_direct+0x24/0x5c)
> [ 14.299747] [<c0b69600>] (phy_connect_direct) from [<c0b6968c>] (phy_connect+0x54/0x88)
> [ 14.307792] [<c0b6968c>] (phy_connect) from [<c0c0e47c>] (cpsw_slave_open+0x230/0x294)
> [ 14.315749] [<c0c0e47c>] (cpsw_slave_open) from [<c0c11634>] (cpsw_ndo_open+0x4b4/0x618)
> [ 14.323883] [<c0c11634>] (cpsw_ndo_open) from [<c0deeb64>] (__dev_open+0xbc/0x124)
> [ 14.331498] [<c0deeb64>] (__dev_open) from [<c0deee4c>] (__dev_change_flags+0xa4/0x154)
> [ 14.331507] [<c0deee4c>] (__dev_change_flags) from [<c0deef24>] (dev_change_flags+0x28/0x58)
> [ 14.331522] [<c0deef24>] (dev_change_flags) from [<c0e025f0>] (do_setlink+0x2f0/0x890)
> [ 14.331531] [<c0e025f0>] (do_setlink) from [<c0e04554>] (rtnl_newlink+0x4b0/0x784)
> [ 14.331539] [<c0e04554>] (rtnl_newlink) from [<c0e04908>] (rtnetlink_rcv_msg+0xe0/0x1fc)
> [ 14.331550] [<c0e04908>] (rtnetlink_rcv_msg) from [<c0e1e538>] (netlink_rcv_skb+0xb0/0xcc)
> [ 14.331559] [<c0e1e538>] (netlink_rcv_skb) from [<c0e01c1c>] (rtnetlink_rcv+0x38/0x40)
> [ 14.331567] [<c0e01c1c>] (rtnetlink_rcv) from [<c0e1de70>] (netlink_unicast+0x180/0x210)
> [ 14.331575] [<c0e1de70>] (netlink_unicast) from [<c0e1e29c>] (netlink_sendmsg+0x2c4/0x380)
> [ 14.331584] [<c0e1e29c>] (netlink_sendmsg) from [<c0dc8304>] (sock_sendmsg+0x24/0x34)
> [ 14.331593] [<c0dc8304>] (sock_sendmsg) from [<c0dc8a70>] (___sys_sendmsg+0x1e0/0x1f0)
> [ 14.331601] [<c0dc8a70>] (___sys_sendmsg) from [<c0dc9884>] (__sys_sendmsg+0x50/0x7c)
> [ 14.331610] [<c0dc9884>] (__sys_sendmsg) from [<c0dc98c8>] (SyS_sendmsg+0x18/0x1c)
> [ 14.331620] [<c0dc98c8>] (SyS_sendmsg) from [<c0408c80>] (ret_fast_syscall+0x0/0x1c)
> [ 14.331629] Code: e52de004 e8bd4000 e59062dc e1a04000 (e5d63008)
> [ 14.331751] ---[ end trace 7927abed2565423d ]---
>
> Full output of a lava job that shows both of these symptoms can be seen
> at https://lkft.validation.linaro.org/scheduler/job/187562.
>
> Looking through the patches, it's not obvious to me where the issue may
> be. We haven't bisected it yet but will begin. I noticed quite a few arm
> changes from Mark Rutland, and a change to net/rds/send.c from Ka-Cheong
> Poon. Both added to CC.
Can you try 'git bisect'? I'll hold off on releasing 4.9.y until this
gets figured out.
thanks,
greg k-h
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