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Message-ID: <5ebb4d31.i/CHZcQYjsSYxM6G%lkp@intel.com>
Date: Wed, 13 May 2020 09:28:17 +0800
From: kernel test robot <lkp@...el.com>
To: Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
Cc: LKP <lkp@...ts.01.org>, linux-kernel@...r.kernel.org,
Amol Grover <frextrite@...il.com>,
"Paul E. McKenney" <paulmck@...nel.org>, philip.li@...el.com
Subject: d13fee049f ("Default enable RCU list lockdep debugging with .."): WARNING: suspicious RCU usage
Greetings,
0day kernel testing robot got the below dmesg and the first bad commit is
https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
commit d13fee049fa8e94649aa9914fd1ab5d07da51da4
Author: Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
AuthorDate: Fri Feb 28 14:54:51 2020 +0530
Commit: Paul E. McKenney <paulmck@...nel.org>
CommitDate: Thu May 7 10:24:43 2020 -0700
Default enable RCU list lockdep debugging with PROVE_RCU
This patch default enables CONFIG_PROVE_RCU_LIST option with
CONFIG_PROVE_RCU for RCU list lockdep debugging.
With this change, RCU list lockdep debugging will be default
enabled in CONFIG_PROVE_RCU=y kernels.
Most of the RCU users (in core kernel/, drivers/, and net/
subsystem) have already been modified to include lockdep
expressions hence RCU list debugging can be enabled by
default.
However, there are still chances of enountering
false-positive lockdep splats because not everything is converted,
in case RCU list primitives are used in non-RCU read-side critical
section but under the protection of a lock. It would be okay to
have a few false-positives, as long as bugs are identified, since this
patch only affects debugging kernels.
Co-developed-by: Amol Grover <frextrite@...il.com>
Signed-off-by: Amol Grover <frextrite@...il.com>
Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
Acked-by: Joel Fernandes (Google) <joel@...lfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
c1fe153b2a torture: Add --allcpus argument to the kvm.sh script
d13fee049f Default enable RCU list lockdep debugging with PROVE_RCU
ec06fa2b14 doc: Tasks RCU must protect instructions before trampoline
+--------------------------------------------------------------------------------------+------------+------------+------------+
| | c1fe153b2a | d13fee049f | ec06fa2b14 |
+--------------------------------------------------------------------------------------+------------+------------+------------+
| boot_successes | 31 | 0 | 0 |
| boot_failures | 2 | 11 | 11 |
| BUG:kernel_hang_in_early-boot_stage,last_printk:Probing_EDD(edd=off_to_disable)...ok | 2 | | |
| WARNING:suspicious_RCU_usage | 0 | 11 | 11 |
| net/ipv6/ip6mr.c:#RCU-list_traversed_in_non-reader_section | 0 | 11 | 11 |
| BUG:kernel_hang_in_test_stage | 0 | 1 | |
+--------------------------------------------------------------------------------------+------------+------------+------------+
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <lkp@...el.com>
[ 71.408539] Performance counters on
[ 71.409303] input device check on
[ 71.473366] NET: Registered protocol family 10
[ 71.479116]
[ 71.479916] =============================
[ 71.480827] WARNING: suspicious RCU usage
[ 71.481663] 5.7.0-rc2-00234-gd13fee049fa8e #1 Not tainted
[ 71.482791] -----------------------------
[ 71.483839] net/ipv6/ip6mr.c:124 RCU-list traversed in non-reader section!!
[ 71.485271]
[ 71.485271] other info that might help us debug this:
[ 71.485271]
[ 71.487039]
[ 71.487039] rcu_scheduler_active = 2, debug_locks = 1
[ 71.488607] 1 lock held by swapper/1:
[ 71.489445] #0: ffffffffa9d313f0 (pernet_ops_rwsem){+.+.}-{3:3}, at: register_pernet_subsys+0x1d/0x60
[ 71.491830]
[ 71.491830] stack backtrace:
[ 71.492769] CPU: 0 PID: 1 Comm: swapper Not tainted 5.7.0-rc2-00234-gd13fee049fa8e #1
[ 71.494422] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[ 71.496343] Call Trace:
[ 71.496909] dump_stack+0x23/0x38
[ 71.497671] lockdep_rcu_suspicious+0x10c/0x11a
[ 71.498683] ip6mr_get_table+0x117/0x130
[ 71.499491] ip6mr_new_table+0x19/0x60
[ 71.500021] ip6mr_net_init+0xf6/0x267
[ 71.500472] ops_init+0x60/0x2b0
[ 71.501054] register_pernet_operations+0xad/0x1e0
[ 71.501899] ? unix_sysctl_register+0xe4/0xe4
[ 71.502727] register_pernet_subsys+0x34/0x60
[ 71.503661] ip6_mr_init+0x58/0x15e
[ 71.504290] inet6_init+0x1a1/0x68f
[ 71.505024] do_one_initcall+0x102/0x500
[ 71.505811] ? perf_trace_initcall_level+0x2c0/0x2c0
[ 71.506759] ? kasan_unpoison_shadow+0x38/0x60
[ 71.507766] ? rcu_read_lock_sched_held+0x85/0xd0
[ 71.508607] do_basic_setup+0x1a9/0x1fd
[ 71.509327] kernel_init_freeable+0x115/0x183
[ 71.510131] ? rest_init+0x22e/0x22e
[ 71.510854] kernel_init+0x13/0x1d2
[ 71.511763] ? rest_init+0x22e/0x22e
[ 71.512572] ret_from_fork+0x24/0x30
modprobe: FATAL: Could not load /lib/modules/5.7.0-rc2-00234-gd13fee049fa8e/modules.dep: No such file or directory
[ 71.746089] Segment Routing with IPv6
[ 71.746959] RPL Segment Routing with IPv6
[ 71.772698] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
[ 71.803782] can: controller area network core (rev 20170425 abi 9)
# HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD
git bisect start a41e54ce803b45b284e10a4e231dba5fec292064 2ef96a5bb12be62ef75b5828c0aab838ebb29cb8 --
git bisect bad 2f7991448f9c479f7ce0e7007b697555df328b46 # 23:56 B 0 2 18 0 Merge 'linux-review/Pavel-Begunkov/io_uring-fix-zero-len-do_splice/20200505-171034' into devel-hourly-2020051219
git bisect bad 3edfcaf0e7672c1e6c7bbfe8db1ceca43f5e7c85 # 00:28 B 0 2 18 0 Merge 'linux-review/Dan-Williams/ACPI-Drop-rcu-usage-for-MMIO-mappings/20200509-013208' into devel-hourly-2020051219
git bisect good 3f1db4c8a03e1ab931248c00ae4c4559e3b5406b # 01:17 G 10 0 1 1 Merge 'ezequielg/rkvdec-vp9-upstream' into devel-hourly-2020051219
git bisect good 5579a78821bdf86725db495878dd9c6245ed2bb3 # 01:41 G 10 0 1 1 Merge 'linux-review/Takashi-Sakamoto/ALSA-firewire-motu-fulfill-missing-entries-in-Kconfig/20200511-103548' into devel-hourly-2020051219
git bisect good e3689f9e910f8fd4b1f565359664e4a72b112034 # 02:13 G 10 0 0 0 Merge 'linux-review/UPDATE-20200512-031403/Lee-Shawn-C/drm-i915-mst-filter-out-the-display-mode-exceed-sink-s-capability/20200420-213842' into devel-hourly-2020051219
git bisect bad d69b0f11241256c60dbf757ac3dd5a96ed91882e # 02:33 B 0 2 18 0 Merge 'rcu/rcu/dev' into devel-hourly-2020051219
git bisect good 0144187eb59fafe035c65eff7a3935a80da27eb0 # 03:12 G 10 0 0 0 Merge 'linux-review/Maninder-Singh/scripts-checkstack-pl-don-t-display-dre-as-different-entity/20200509-051219' into devel-hourly-2020051219
git bisect good f4311b8d31874d2bde6adabf8ac1d335ea35b35f # 03:52 G 10 0 0 0 Merge 'linux-review/Saeed-Mahameed/Mellanox-mlx5-and-bonding-updates-2020-05-09/20200509-191959' into devel-hourly-2020051219
git bisect good 4a49fd5e59ac0f31ef28ebb545a73845e7943416 # 04:17 G 10 0 1 1 Merge 'nf/master' into devel-hourly-2020051219
git bisect good 071972c7badf15fd8fbb804c6b5d727a48d16ed7 # 04:44 G 10 0 1 1 Merge 'zen-kernel-zen-kernel/5.6/fsgsbase' into devel-hourly-2020051219
git bisect good 3123dcd3ef7f98482dd0a459e85a750448161b38 # 05:27 G 10 0 1 1 fork: Annotate a data race in vm_area_dup()
git bisect good 8d6d79f04175a9ce8091601a9e5eefc1dfead091 # 06:04 G 11 0 2 2 kcsan: Add test suite
git bisect good 3ff7cf6d6d90ec5a196b31ef03777e756807e92a # 06:24 G 10 0 0 0 torture: Add script to smoke-test commits in a branch
git bisect bad 91f877ab4b94c0d463a60b8c77d529096a8268c1 # 06:40 B 0 1 17 0 rcu: Priority-boost-related sleeps to idle priority
git bisect good c1fe153b2a011a7d5f156f12ee518b1b0dc53fa1 # 07:20 G 10 0 0 0 torture: Add --allcpus argument to the kvm.sh script
git bisect bad 3d9e98763d855022fef5285b3fd779238f9ab554 # 07:35 B 0 1 17 0 rcu: Grace-period-kthread related sleeps to idle priority
git bisect bad d13fee049fa8e94649aa9914fd1ab5d07da51da4 # 07:58 B 0 2 18 0 Default enable RCU list lockdep debugging with PROVE_RCU
# first bad commit: [d13fee049fa8e94649aa9914fd1ab5d07da51da4] Default enable RCU list lockdep debugging with PROVE_RCU
git bisect good c1fe153b2a011a7d5f156f12ee518b1b0dc53fa1 # 08:12 G 30 0 0 1 torture: Add --allcpus argument to the kvm.sh script
# extra tests with debug options
git bisect bad d13fee049fa8e94649aa9914fd1ab5d07da51da4 # 08:30 B 0 2 18 0 Default enable RCU list lockdep debugging with PROVE_RCU
# extra tests on head commit of rcu/rcu/next
git bisect bad ec06fa2b148836f3f50082eb502b8f0aadb8970a # 08:42 B 0 1 17 0 doc: Tasks RCU must protect instructions before trampoline
# bad: [ec06fa2b148836f3f50082eb502b8f0aadb8970a] doc: Tasks RCU must protect instructions before trampoline
# extra tests on revert first bad commit
git bisect good 92587bc102c54408efd66e5b9212bbd3641967c1 # 09:27 G 10 0 1 1 Revert "Default enable RCU list lockdep debugging with PROVE_RCU"
# good: [92587bc102c54408efd66e5b9212bbd3641967c1] Revert "Default enable RCU list lockdep debugging with PROVE_RCU"
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/lkp@lists.01.org
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