lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Date:   Sun, 24 May 2020 01:44:37 +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: f410328e93 ("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 dev.2020.05.14b

commit f410328e93834f1d9c7e2f707ac05fd9e6417c27
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 14 10:11:39 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>

df2e4807c8  torture: Add --allcpus argument to the kvm.sh script
f410328e93  Default enable RCU list lockdep debugging with PROVE_RCU
c1628f71b9  ubsan, kcsan: Don't combine sanitizer with kcov on clang
+-------------------------------------------------------------------------+------------+------------+------------+
|                                                                         | df2e4807c8 | f410328e93 | c1628f71b9 |
+-------------------------------------------------------------------------+------------+------------+------------+
| boot_successes                                                          | 2          | 0          | 0          |
| boot_failures                                                           | 37         | 17         | 23         |
| Assertion_failed                                                        | 33         | 13         | 13         |
| Kernel_panic-not_syncing:Attempted_to_kill_init!exitcode=               | 35         | 15         | 21         |
| BUG:kernel_hang_in_test_stage                                           | 2          | 1          |            |
| WARNING:suspicious_RCU_usage                                            | 0          | 17         | 23         |
| security/smack/smack_lsm.c:#RCU-list_traversed_in_non-reader_section    | 0          | 17         | 23         |
| security/smack/smack_access.c:#RCU-list_traversed_in_non-reader_section | 0          | 17         | 23         |
+-------------------------------------------------------------------------+------------+------------+------------+

If you fix the issue, kindly add following tag
Reported-by: kernel test robot <lkp@...el.com>

[    0.347631] ..... CPU clock speed is 2893.0023 MHz.
[    0.347631] ..... host bus clock speed is 1000.0027 MHz.
[    0.347677] smpboot: CPU0: Intel Common KVM processor (family: 0xf, model: 0x6, stepping: 0x1)
[    0.348602] 
[    0.348635] =============================
[    0.348962] WARNING: suspicious RCU usage
[    0.349295] 5.7.0-rc2-00236-gf410328e93834 #1 Not tainted
[    0.349634] -----------------------------
[    0.349962] security/smack/smack_lsm.c:354 RCU-list traversed in non-reader section!!
[    0.350634] 
[    0.350634] other info that might help us debug this:
[    0.350634] 
[    0.351278] 
[    0.351278] rcu_scheduler_active = 1, debug_locks = 1
[    0.351675] no locks held by kthreadd/2.
[    0.351997] 
[    0.351997] stack backtrace:
[    0.352636] CPU: 0 PID: 2 Comm: kthreadd Not tainted 5.7.0-rc2-00236-gf410328e93834 #1
[    0.353267] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[    0.353631] Call Trace:
[    0.353631]  ? dump_stack+0x6b/0x9b
[    0.353631]  ? smack_cred_prepare+0x1c8/0x1e0
[    0.353631]  ? smack_sk_alloc_security+0xa0/0xa0
[    0.353631]  ? security_prepare_creds+0x3f/0x90
[    0.353631]  ? prepare_creds+0x13c/0x260
[    0.353631]  ? copy_creds+0x2c/0x1d0
[    0.353631]  ? copy_process+0x366/0x1760
[    0.353631]  ? lock_acquire+0x72/0x370
[    0.353631]  ? _do_fork+0x71/0x680
[    0.353631]  ? lock_acquire+0x72/0x370
[    0.353631]  ? kthread_park+0xa0/0xa0
[    0.353631]  ? kthreadd+0x50/0x140
[    0.353631]  ? kernel_thread+0x4e/0x60
[    0.353631]  ? kthread_park+0xa0/0xa0
[    0.353631]  ? kthreadd+0xf4/0x140
[    0.353631]  ? kthread_create_on_cpu+0x80/0x80
[    0.353631]  ? ret_from_fork+0x2e/0x38
[    0.354096] Performance Events: unsupported Netburst CPU model 6 no PMU driver, software events only.
[    0.354910] rcu: Hierarchical SRCU implementation.
[    0.356850] NMI watchdog: Perf NMI watchdog permanently disabled
[    0.357864] smp: Bringing up secondary CPUs ...
[    0.359261] x86: Booting SMP configuration:

                                                          # HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD
git bisect start 144ce0ceed88071d2cffb323089fcb710f2e4350 0e698dfa282211e414076f9dc7e83c1c288314fd --
git bisect good 0f5233d56ed5563c895eb957131074e71b821ffd  # 23:25  G     11     0   11  11  Merge 'regulator/for-next' into devel-catchup-202005150615
git bisect good a9f1f0805c1a2d8b1a53afbae38c3516b5194179  # 23:31  G     11     0   11  17  Merge 's390/fixes' into devel-catchup-202005150615
git bisect  bad 61973078db675fd3ee2e26fc0bd9708b9d79b2df  # 23:41  B      0     8   29   5  Merge 'rcu/dev.2020.05.14b' into devel-catchup-202005150615
git bisect good 74e078cc85670493864c48208e04229d4fac48fa  # 23:50  G     11     0   11  17  Merge 'linux-review/Grygorii-Strashko/soc-ti-add-k3-platforms-chipid-module-driver/20200514-153644' into devel-catchup-202005150615
git bisect good 4b0c4c07546dfca786eaa447d9f9f95b25c7b399  # 23:58  G     10     0   10  22  Merge 'jpirko-mlxsw/combined_queue' into devel-catchup-202005150615
git bisect good 8b458949f2e7896ee126899994a23735a9be2d2d  # 00:07  G     11     0   11  17  Merge 'block/for-5.8/block' into devel-catchup-202005150615
git bisect  bad e317828f7d9693a7cd5a718e947bcf3824f6146a  # 00:16  B      0     7   25   2  rcu: Expedited grace-period sleeps to idle priority
git bisect  bad 9ddfee9e62685e77b23c25a0fff7eaef56092130  # 00:23  B      0    11   32   5  rcu: Grace-period-kthread related sleeps to idle priority
git bisect  bad f410328e93834f1d9c7e2f707ac05fd9e6417c27  # 00:33  B      0     1   21   4  Default enable RCU list lockdep debugging with PROVE_RCU
# first bad commit: [f410328e93834f1d9c7e2f707ac05fd9e6417c27] Default enable RCU list lockdep debugging with PROVE_RCU
git bisect good df2e4807c87c32ff01e0fe25b0fdf1352ab986bd  # 00:53  G     33     0   33  35  torture: Add --allcpus argument to the kvm.sh script
# extra tests with debug options
git bisect  bad f410328e93834f1d9c7e2f707ac05fd9e6417c27  # 01:01  B      0    10   26   0  Default enable RCU list lockdep debugging with PROVE_RCU
# extra tests on head commit of rcu/dev.2020.05.14b
git bisect  bad c1628f71b9ac81a2349f02cdebaaefe35a3fe4ba  # 01:22  B      0     8   36  12  ubsan, kcsan: Don't combine sanitizer with kcov on clang
# bad: [c1628f71b9ac81a2349f02cdebaaefe35a3fe4ba] ubsan, kcsan: Don't combine sanitizer with kcov on clang
# extra tests on revert first bad commit
git bisect good 183564b7c798c2d106ad64972d202433a536ccca  # 01:44  G     11     0   11  11  Revert "Default enable RCU list lockdep debugging with PROVE_RCU"
# good: [183564b7c798c2d106ad64972d202433a536ccca] 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

Download attachment "dmesg-quantal-vm-quantal-42:20200524003307:i386-randconfig-r026-20200514:5.7.0-rc2-00236-gf410328e93834:1.gz" of type "application/gzip" (17247 bytes)

Download attachment "dmesg-quantal-vm-quantal-10:20200524004553:i386-randconfig-r026-20200514:5.7.0-rc2-00235-gdf2e4807c87c3:1.gz" of type "application/gzip" (16446 bytes)

View attachment "reproduce-quantal-vm-quantal-42:20200524003307:i386-randconfig-r026-20200514:5.7.0-rc2-00236-gf410328e93834:1" of type "text/plain" (922 bytes)

Download attachment "144ce0ceed88071d2cffb323089fcb710f2e4350:gcc-7:i386-randconfig-r026-20200514:security_smack_smack_access.c:_RCU-list_traversed_in_non-reader_section.xz" of type "application/x-xz" (6244 bytes)

View attachment "config-5.7.0-rc2-00236-gf410328e93834" of type "text/plain" (147328 bytes)

View attachment "config-5.7.0-rc2-00236-gf410328e93834" of type "text/plain" (147329 bytes)

Powered by blists - more mailing lists