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Date: Mon, 8 Oct 2018 15:28:41 +0200
From: Daniel Borkmann <daniel@...earbox.net>
To: Naresh Kamboju <naresh.kamboju@...aro.org>,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@...r.kernel.org>
Cc: Shuah Khan <shuahkh@....samsung.com>,
Anders Roxell <anders.roxell@...aro.org>,
Rafael Tinoco <rafael.tinoco@...aro.org>, ast@...nel.org,
netdev@...r.kernel.org, songliubraving@...com, willemb@...gle.com
Subject: Re: selftests/bpf: test_kmod.sh hangs on all devices
On 10/08/2018 03:13 PM, Naresh Kamboju wrote:
> BPF test case test_kmod.sh hangs on all devices running linux next.
>
> + cd /opt/kselftests/default-in-kernel/bpf
> + ./test_kmod.sh
> sysctl: cannot stat /proc/sys/net/core/bpf_jit_enable: No such file or directory
> sysctl: cannot stat /proc/sys/net/core/bpf_jit_harden: No such file or directory
> sysctl: cannot stat /proc/sys/net/core/bpf_jit_enable: No such file or directory
> sysctl: cannot stat /proc/sys/net/core/bpf_jit_harden: No such file or directory
> [ JIT enabled:0 hardened:0 ]
>
> https://lkft.validation.linaro.org/scheduler/job/429726
>
> Test hangs started from 4.19.0-rc4-next-20180918.
> Linux version 4.19.0-rc4-next-20180918 (oe-user@...host) (gcc version
> 7.1.1 20170707 (Linaro GCC 7.1-2017.08)) #1 SMP Tue Sep 18 05:26:00
> UTC 2018
>
> History can be compared from this page.
> https://qa-reports.linaro.org/lkft/linux-next-oe/tests/kselftest/bpf_test_kmod.sh
>
> OTOH,
> There is a kernel BUG,
This is quite an old linux-next kernel, should be fixed by 100811936f89 ("bpf: test_bpf:
add init_net to dev for flow_dissector"). Please make sure you have that commit included
in your testing:
https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=100811936f89fd455eda1984810c09003550555b
Thanks,
Daniel
> [ 41.003698] BUG: unable to handle kernel paging request at 0000000000001460
> [ 41.016603] PGD 800000045d648067 P4D 800000045d648067 PUD 4575c8067 PMD 0
> [ 41.023475] Oops: 0000 [#1] SMP PTI
> [ 41.026959] CPU: 3 PID: 2790 Comm: modprobe Not tainted
> 4.19.0-rc4-next-20180920 #1
> [ 41.034621] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
> 2.0b 07/27/2017
> [ 41.042094] RIP: 0010:__skb_flow_dissect+0xd9/0x1740
> [ 41.047057] Code: 7b 79 ff 85 c0 41 5a 74 0d 80 3d 06 cd 00 01 00
> 0f 84 4f 05 00 00 4d 85 ff 0f 84 4a 02 00 00 49 8b 47 10 48 8b 80 40
> 05 00 00 <4c> 8b 80 60 14 00 00 4c 89 85 28 ff ff ff e8 54 7b 79 ff 85
> c0 4c
> [ 41.065795] RSP: 0018:ffff9accc1cf79c0 EFLAGS: 00010286
> [ 41.071019] RAX: 0000000000000000 RBX: 000000000000000e RCX: 000000002c29b266
> [ 41.078143] RDX: 0000000097969774 RSI: 0000000000000000 RDI: 0000000000000001
> [ 41.085268] RBP: ffff9accc1cf7ac0 R08: ffffffff9b7517e9 R09: 0000000000000002
> [ 41.092392] R10: ffffffff9b7517e9 R11: ffffffff9c662080 R12: ffffffff9c78b620
> [ 41.099517] R13: 0000000000000008 R14: ffff9accc1cf7aec R15: ffff882f575e6800
> [ 41.106640] FS: 00007fcb533fe740(0000) GS:ffff882f5fb80000(0000)
> knlGS:0000000000000000
> [ 41.114716] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 41.120454] CR2: 0000000000001460 CR3: 000000045b606002 CR4: 00000000003606e0
> [ 41.127590] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 41.134737] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 41.141860] Call Trace:
> [ 41.144305] ? find_held_lock+0x35/0xa0
> [ 41.148136] ? __lock_acquire+0x2b5/0x1340
> [ 41.152227] ? find_held_lock+0x35/0xa0
> [ 41.156057] skb_get_poff+0x4b/0x90
> [ 41.159542] ? skb_get_poff+0x4b/0x90
> [ 41.163207] bpf_skb_get_pay_offset+0xe/0x20
> [ 41.167471] ___bpf_prog_run+0x45f/0x10d0
> [ 41.171475] __bpf_prog_run32+0x39/0x50
> [ 41.175305] ? lockdep_hardirqs_on+0xef/0x180
> [ 41.179656] ? ktime_get+0x6b/0x110
> [ 41.183143] test_bpf_init+0x5ab/0x1000 [test_bpf]
> [ 41.187933] ? 0xffffffffc02e2000
> [ 41.191244] do_one_initcall+0x5f/0x2b7
> [ 41.195074] ? rcu_read_lock_sched_held+0x81/0x90
> [ 41.199770] ? kmem_cache_alloc_trace+0x1de/0x210
> [ 41.204469] ? do_init_module+0x27/0x212
> [ 41.208387] do_init_module+0x5f/0x212
> [ 41.212138] load_module+0x20f5/0x2640
> [ 41.215886] __do_sys_finit_module+0xd1/0xf0
> [ 41.220156] ? __do_sys_finit_module+0xd1/0xf0
> [ 41.224626] __x64_sys_finit_module+0x1a/0x20
> [ 41.228984] do_syscall_64+0x4f/0x190
> [ 41.232645] entry_SYSCALL_64_after_hwframe+0x49/0xbe
> [ 41.237697] RIP: 0033:0x7fcb52d087f9
> [ 41.241266] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00
> 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24
> 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 4f e6 2b 00 f7 d8 64 89
> 01 48
> [ 41.260004] RSP: 002b:00007ffe780dd828 EFLAGS: 00000206 ORIG_RAX:
> 0000000000000139
> [ 41.267589] RAX: ffffffffffffffda RBX: 00000000006aba70 RCX: 00007fcb52d087f9
> [ 41.274737] RDX: 0000000000000000 RSI: 0000000000418424 RDI: 0000000000000003
> [ 41.281861] RBP: 0000000000418424 R08: 0000000000000000 R09: 0000000000000000
> [ 41.288985] R10: 0000000000000003 R11: 0000000000000206 R12: 0000000000000000
> [ 41.296108] R13: 0000000000040000 R14: 0000000000000000 R15: 0000000000000000
> [ 41.303234] Modules linked in: test_bpf(+) x86_pkg_temp_thermal fuse
> [ 41.309590] CR2: 0000000000001460
> [ 41.312930] ---[ end trace a7d5229a26c41aad ]---
> [ 41.317541] RIP: 0010:__skb_flow_dissect+0xd9/0x1740
> [ 41.322497] Code: 7b 79 ff 85 c0 41 5a 74 0d 80 3d 06 cd 00 01 00
> 0f 84 4f 05 00 00 4d 85 ff 0f 84 4a 02 00 00 49 8b 47 10 48 8b 80 40
> 05 00 00 <4c> 8b 80 60 14 00 00 4c 89 85 28 ff ff ff e8 54 7b 79 ff 85
> c0 4c
> [ 41.341235] RSP: 0018:ffff9accc1cf79c0 EFLAGS: 00010286
> [ 41.346452] RAX: 0000000000000000 RBX: 000000000000000e RCX: 000000002c29b266
> [ 41.353588] RDX: 0000000097969774 RSI: 0000000000000000 RDI: 0000000000000001
> [ 41.360716] RBP: ffff9accc1cf7ac0 R08: ffffffff9b7517e9 R09: 0000000000000002
> [ 41.367841] R10: ffffffff9b7517e9 R11: ffffffff9c662080 R12: ffffffff9c78b620
> [ 41.374964] R13: 0000000000000008 R14: ffff9accc1cf7aec R15: ffff882f575e6800
> [ 41.382089] FS: 00007fcb533fe740(0000) GS:ffff882f5fb80000(0000)
> knlGS:0000000000000000
> [ 41.390165] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 41.395903] CR2: 0000000000001460 CR3: 000000045b606002 CR4: 00000000003606e0
> [ 41.403026] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 41.410153] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 41.417275] BUG: sleeping function called from invalid context at
> /srv/oe/build/tmp-rpb-glibc/work-shared/intel-corei7-64/kernel-source/include/linux/percpu-rwsem.h:34
> [ 41.432199] in_atomic(): 1, irqs_disabled(): 1, pid: 2790, name: modprobe
> [ 41.438977] INFO: lockdep is turned off.
> [ 41.442893] irq event stamp: 13766
> [ 41.446292] hardirqs last enabled at (13765): [<ffffffff9af037eb>]
> ktime_get+0x6b/0x110
> [ 41.454369] hardirqs last disabled at (13766): [<ffffffff9ae01c6b>]
> trace_hardirqs_off_thunk+0x1a/0x1c
> [ 41.463658] softirqs last enabled at (13728): [<ffffffff9be0032d>]
> __do_softirq+0x32d/0x42f
> [ 41.472084] softirqs last disabled at (13711): [<ffffffff9ae70679>]
> irq_exit+0xc9/0xd0
> [ 41.479996] CPU: 3 PID: 2790 Comm: modprobe Tainted: G D
> 4.19.0-rc4-next-20180920 #1
> [ 41.489026] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
> 2.0b 07/27/2017
> [ 41.496496] Call Trace:
> [ 41.498943] dump_stack+0x70/0xa5
> [ 41.502261] ___might_sleep+0x152/0x240
> [ 41.506091] __might_sleep+0x4a/0x80
> [ 41.509679] exit_signals+0x33/0x240
> [ 41.513249] do_exit+0xb1/0xc60
> [ 41.516387] rewind_stack_do_exit+0x17/0x20
> [ 41.520587] RIP: 0033:0x7fcb52d087f9
> [ 41.524177] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00
> 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24
> 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 4f e6 2b 00 f7 d8 64 89
> 01 48
> [ 41.542914] RSP: 002b:00007ffe780dd828 EFLAGS: 00000206 ORIG_RAX:
> 0000000000000139
> [ 41.550471] RAX: ffffffffffffffda RBX: 00000000006aba70 RCX: 00007fcb52d087f9
> [ 41.557608] RDX: 0000000000000000 RSI: 0000000000418424 RDI: 0000000000000003
> [ 41.564735] RBP: 0000000000418424 R08: 0000000000000000 R09: 0000000000000000
> [ 41.571860] R10: 0000000000000003 R11: 0000000000000206 R12: 0000000000000000
> [ 41.578985] R13: 0000000000040000 R14: 0000000000000000 R15: 0000000000000000
> e)
>
> Bug reported,
> https://bugs.linaro.org/show_bug.cgi?id=4006
>
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