[linux-next:master] [rcutorture] 7a1fcbb52e: WARNING:at_kernel/rcu/rcutorture.c:#rcu_torture_stats_print[rcutorture]

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Hello,

the config for this test is a randconfig. by this commit, the config has below
diff between parent and this commit.

--- /pkg/linux/i386-randconfig-r022-20221003/gcc-13/d65635ebba92ee02e8284acfabbaf6b59ec0b5b6/.config    2024-06-23 23:24:45.203220229 +0800
+++ /pkg/linux/i386-randconfig-r022-20221003/gcc-13/7a1fcbb52e611c49331bd66dd2da1efa4c0afef7/.config    2024-06-23 23:59:34.976722738 +0800
@@ -133,7 +133,7 @@ CONFIG_IRQ_TIME_ACCOUNTING=y
 CONFIG_TREE_RCU=y
 CONFIG_PREEMPT_RCU=y
 CONFIG_RCU_EXPERT=y
-CONFIG_TREE_SRCU=y
+CONFIG_TINY_SRCU=y
 CONFIG_TASKS_RCU_GENERIC=y
 CONFIG_FORCE_TASKS_RCU=y
 CONFIG_NEED_TASKS_RCU=y


we don't have enough knowledge how this diff impacts rcutorture test results,
just FYI what we observed in our tests.


kernel test robot noticed "WARNING:at_kernel/rcu/rcutorture.c:#rcu_torture_stats_print[rcutorture]" on:

commit: 7a1fcbb52e611c49331bd66dd2da1efa4c0afef7 ("rcutorture: Add SRCU-V scenario for preemptible Tiny SRCU")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

[test failed on linux-next/master f76698bd9a8ca01d3581236082d786e9a6b72bb7]

in testcase: rcutorture
version: 
with following parameters:

	runtime: 300s
	test: default
	torture_type: busted_srcud



compiler: gcc-13
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

(please refer to attached dmesg/kmsg for entire log/backtrace)


+-------------------------------------------------------------------------+------------+------------+
|                                                                         | d65635ebba | 7a1fcbb52e |
+-------------------------------------------------------------------------+------------+------------+
| WARNING:suspicious_RCU_usage                                            | 6          | 6          |
| kernel/rcu/rcutorture.c:#suspicious_rcu_dereference_check()usage        | 6          | 6          |
| WARNING:at_kernel/rcu/rcutorture.c:#rcu_torture_stats_print[rcutorture] | 0          | 6          |
| EIP:rcu_torture_stats_print                                             | 0          | 6          |
+-------------------------------------------------------------------------+------------+------------+


If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-lkp/202406241652.e44865a0-lkp@xxxxxxxxx



The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240624/202406241652.e44865a0-lkp@xxxxxxxxx


[   96.952168][  T436] busted_srcud-torture: !!! 
[   96.952253][  T436] ------------[ cut here ]------------
[   96.954867][  T436] WARNING: CPU: 0 PID: 436 at kernel/rcu/rcutorture.c:2268 rcu_torture_stats_print+0x253/0x496 [rcutorture]
[   96.956537][  T436] Modules linked in: rcutorture torture ppdev i6300esb rapl ipmi_devintf parport_pc bochs drm_vram_helper parport drm_ttm_helper ttm drm_kms_helper i2c_piix4 tiny_power_button ata_generic button fuse drm drm_panel_orientation_quirks i2c_core configfs
[   96.959483][  T436] CPU: 0 PID: 436 Comm: rcu_torture_sta Not tainted 6.10.0-rc1-00067-g7a1fcbb52e61 #1
[   96.960380][  T436] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[   96.961355][  T436] EIP: rcu_torture_stats_print+0x253/0x496 [rcutorture]
[   96.962139][  T436] Code: 85 c0 74 02 0f 0b 83 3d e4 17 59 ef 00 74 02 0f 0b 83 3d e0 17 59 ef 00 74 02 0f 0b 83 3d dc 17 59 ef 00 74 02 0f 0b 4b 7e 02 <0f> 0b 68 31 76 59 ef 31 db e8 40 11 54 de 5f 83 fb 0b 72 0c 89 da
[   96.963988][  T436] EAX: 00000000 EBX: 00000003 ECX: ef597627 EDX: ef59762c
[   96.964651][  T436] ESI: ef591994 EDI: 0000453c EBP: c6567f6c ESP: c6567eec
[   96.965187][  T436] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010206
[   96.965660][  T436] CR0: 80050033 CR2: b6b5f000 CR3: 04f71000 CR4: 00040690
[   96.966172][  T436] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[   96.966624][  T436] DR6: fffe0ff0 DR7: 00000400
[   96.966924][  T436] Call Trace:
[   96.967138][  T436]  ? show_regs+0x45/0x4b
[   96.967415][  T436]  ? rcu_torture_stats_print+0x253/0x496 [rcutorture]
[   96.967849][  T436]  ? __warn+0x7c/0x113
[   96.968117][  T436]  ? report_bug+0xb3/0x111
[   96.968406][  T436]  ? rcu_torture_stats_print+0x253/0x496 [rcutorture]
[   96.968880][  T436]  ? exc_overflow+0x37/0x37
[   96.969174][  T436]  ? handle_bug+0x2b/0x47
[   96.969452][  T436]  ? exc_invalid_op+0x17/0x53
[   96.969755][  T436]  ? handle_exception+0x100/0x100
[   96.970141][  T436]  ? exc_overflow+0x37/0x37
[   96.970434][  T436]  ? rcu_torture_stats_print+0x253/0x496 [rcutorture]
[   96.970871][  T436]  ? exc_overflow+0x37/0x37
[   96.971162][  T436]  ? rcu_torture_stats_print+0x253/0x496 [rcutorture]
[   96.971599][  T436]  ? __timer_delete_sync+0x82/0x92
[   96.971938][  T436]  rcu_torture_stats+0x3d/0x5e [rcutorture]
[   96.972322][  T436]  kthread+0xdc/0xe1
[   96.972575][  T436]  ? rcu_torture_stats_print+0x496/0x496 [rcutorture]
[   96.973010][  T436]  ? kthread_park+0x62/0x62
[   96.973302][  T436]  ret_from_fork+0x1c/0x2f
[   96.973589][  T436]  ? kthread_park+0x62/0x62
[   96.973879][  T436]  ret_from_fork_asm+0x12/0x18
[   96.974230][  T436]  entry_INT80_32+0xef/0xef
[   96.974519][  T436] irq event stamp: 535
[   96.974777][  T436] hardirqs last  enabled at (543): [<cda8b4e9>] console_unlock+0x80/0xd4
[   96.975183][  T436] hardirqs last disabled at (550): [<cda8b4cc>] console_unlock+0x63/0xd4
[   96.975588][  T436] softirqs last  enabled at (104): [<cda4d6de>] handle_softirqs+0x2cf/0x2f9
[   96.976007][  T436] softirqs last disabled at (97): [<ce313fce>] __do_softirq+0xa/0xc
[   96.976392][  T436] ---[ end trace 0000000000000000 ]---
[   96.999461][  T436] Reader Pipe:  1738294 6779 1992 57 1 0 0 0 0 0 0
[   96.999803][  T436] busted_srcud-torture: Reader Batch:  1747123 0 0 0 0 0 0 0 0 0 0



-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki





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