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Date: Mon, 10 Apr 2017 10:35:02 +0800
From: kernel test robot <fengguang.wu@...el.com>
To: David Miller <davem@...emloft.net>
Cc: LKP <lkp@...org>, 0day robot <fengguang.wu@...el.com>,
netdev@...r.kernel.org, wfg@...ux.intel.com
Subject: 80b10d1d56: net/core/dev.c:7907 suspicious
rcu_dereference_check() usage!
Greetings,
0day kernel testing robot got the below dmesg and the first bad commit is
https://github.com/0day-ci/linux/commits/David-Miller/Generic-XDP/20170410-044106
commit 80b10d1d56ec8074ac8f458439a571b72e9b3ea2
Author: David Miller <davem@...emloft.net>
AuthorDate: Sun Apr 9 13:35:28 2017 -0700
Commit: 0day robot <fengguang.wu@...el.com>
CommitDate: Mon Apr 10 04:41:14 2017 +0800
Generic XDP
This provides a generic non-optimized XDP implementation when the
device driver does not provide an optimized one.
It is arguable that perhaps I should have required something like
this as part of the initial XDP feature merge.
I believe this is critical for two reasons:
1) Accessibility. More people can play with XDP with less
dependencies. Yes I know we have XDP support in virtio_net, but
that just creates another depedency for learning how to use this
facility.
I wrote this to make life easier for the XDP newbies.
2) As a model for what the expected semantics are. If there is a pure
generic core implementation, it serves as a semantic example for
driver folks adding XDP support.
This is just a rough draft and is untested.
Signed-off-by: David S. Miller <davem@...emloft.net>
417d978fa5 Merge branch 'dsa-receive-path-simplifications'
80b10d1d56 Generic XDP
80b10d1d56 Generic XDP
+---------------------------------------------------------+------------+------------+------------+
| | 417d978fa5 | 80b10d1d56 | 80b10d1d56 |
+---------------------------------------------------------+------------+------------+------------+
| boot_successes | 39 | 0 | 0 |
| boot_failures | 0 | 24 | 24 |
| net/core/dev.c:#suspicious_rcu_dereference_check()usage | 0 | 24 | 24 |
+---------------------------------------------------------+------------+------------+------------+
[ 8.069991]
[ 8.070587] ===============================
[ 8.071556] [ ERR: suspicious RCU usage. ]
[ 8.072486] 4.11.0-rc5-01173-g80b10d1 #1 Not tainted
[ 8.073527] -------------------------------
[ 8.074461] net/core/dev.c:7907 suspicious rcu_dereference_check() usage!
[ 8.076361]
[ 8.076361] other info that might help us debug this:
[ 8.076361]
[ 8.078517]
[ 8.078517] rcu_scheduler_active = 2, debug_locks = 0
[ 8.080154] no locks held by swapper/0/1.
[ 8.081099]
[ 8.081099] stack backtrace:
[ 8.082581] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.11.0-rc5-01173-g80b10d1 #1
[ 8.084378] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
[ 8.086576] Call Trace:
[ 8.087377] dump_stack+0x82/0xb8
[ 8.088224] lockdep_rcu_suspicious+0xf7/0x100
[ 8.089240] free_netdev+0xf0/0x135
[ 8.090126] sbni_probe+0x287/0x2ba
[ 8.090993] ? set_debug_rodata+0x12/0x12
[ 8.091927] net_olddevs_init+0x14/0x72
[ 8.092865] ? probe_list2+0x50/0x50
[ 8.093720] do_one_initcall+0x90/0x142
[ 8.094605] ? set_debug_rodata+0x12/0x12
[ 8.095501] kernel_init_freeable+0x1d0/0x258
[ 8.096450] ? rest_init+0x13b/0x13b
[ 8.097276] kernel_init+0xe/0xf5
[ 8.098069] ret_from_fork+0x31/0x40
[ 8.101856] tun: Universal TUN/TAP device driver, 1.6
[ 8.103145] arcnet: arcnet loaded
[ 8.103940] arcnet:rfc1201: RFC1201 "standard" (`a') encapsulation support loaded
[ 8.105613] arcnet:rfc1051: RFC1051 "simple standard" (`s') encapsulation support loaded
[ 8.107434] arcnet:arc_rawmode: raw mode (`r') encapsulation support loaded
# HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD
git bisect start 43fbb962e25bf4fb66be1238c37260fb090eb6a8 39da7c509acff13fc8cb12ec1bb20337c988ed36 --
git bisect good 6d38c461214beefa996cd347243bfd91ff8d1d6f # 06:02 G 10 0 0 0 Merge 'linux-review/Vincent-Stehl/regulator-isl9305-fix-array-size/20170410-043334' into devel-catchup-201704100458
git bisect good 82ae802870562804ea54e325468e0b917eacdd84 # 06:11 G 11 0 0 0 Merge 'block/for-linus' into devel-catchup-201704100458
git bisect bad a82b8eabd367f91ef77c636552b4ad7730375941 # 07:19 B 0 2 22 9 Merge 'linux-review/David-Miller/Generic-XDP/20170410-044106' into devel-catchup-201704100458
git bisect good 6069f3fbde03211f4b839e188eba2439f8b8326a # 07:36 G 10 0 0 0 liquidio: fix tx completions in napi poll
git bisect good eefe06e8ceea88f8397a8df0880ab5ca28dcada6 # 07:38 G 11 0 0 0 Merge branch 'bpf-prog-testing-framework'
git bisect good 2f78227874754b1e10cd348fd6e7693b0dabb3f6 # 08:10 G 11 0 0 0 qed: Correct MSI-x for storage
git bisect good 45e60cb3fa4ef7663ed8e13ef4e9464df4301326 # 08:22 G 10 0 0 0 Merge branch '40GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/jkirsher/next-queue
git bisect good ce736788e8a92c12639311a9f01d55ccc997729c # 08:40 G 10 0 0 0 net: stmmac: adding multiple buffers for TX
git bisect good c42cb98cfd18dc66b099f4d4a310e12ac8957630 # 08:44 G 11 0 0 0 Merge tag 'mlx5-updates-2017-04-16' of git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux
git bisect good bffb184247bcc783a40a0e123a9a2de3c5b28157 # 08:55 G 10 0 0 0 netvsc: Initialize all channel related state prior to opening the channel
git bisect good 16c5dcb13a371feae0e680e6518775b5335b37d8 # 09:14 G 11 0 0 1 net: dsa: Move skb_unshare() to dsa_switch_rcv()
git bisect good 417d978fa532b61b89f0c3ccbd9cdb51090ea032 # 09:25 G 10 0 0 0 Merge branch 'dsa-receive-path-simplifications'
git bisect bad 80b10d1d56ec8074ac8f458439a571b72e9b3ea2 # 09:48 B 0 2 36 11 Generic XDP
# first bad commit: [80b10d1d56ec8074ac8f458439a571b72e9b3ea2] Generic XDP
git bisect good 417d978fa532b61b89f0c3ccbd9cdb51090ea032 # 10:09 G 31 0 0 0 Merge branch 'dsa-receive-path-simplifications'
# extra tests on HEAD of linux-devel/devel-catchup-201704100458
git bisect bad 43fbb962e25bf4fb66be1238c37260fb090eb6a8 # 10:09 B 0 27 66 0 0day head guard for 'devel-catchup-201704100458'
# extra tests on tree/branch linux-review/David-Miller/Generic-XDP/20170410-044106
git bisect bad 80b10d1d56ec8074ac8f458439a571b72e9b3ea2 # 10:10 B 0 24 60 0 Generic XDP
# extra tests with first bad commit reverted
git bisect good c0140fccd94de2b1f8bd136e7874b8312d3542fe # 10:34 G 10 0 0 0 Revert "Generic XDP"
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/lkp Intel Corporation
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