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Message-ID: <4062c4c8-50c0-4f49-b985-8b59331b8bb3@paulmck-laptop>
Date: Tue, 24 Dec 2024 09:57:16 -0800
From: "Paul E. McKenney" <paulmck@...nel.org>
To: kernel test robot <oliver.sang@...el.com>
Cc: oe-lkp@...ts.linux.dev, lkp@...el.com,
Frederic Weisbecker <frederic@...nel.org>, rcu@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [paulmckrcu:dev.2024.12.11a] [rcutorture] 774c4d7adb:
WARNING:at_kernel/rcu/rcutorture.c:#rcutorture_one_extend_check[rcutorture]
On Tue, Dec 24, 2024 at 02:48:26PM +0800, kernel test robot wrote:
>
> hi, Paul,
>
> we noticed there is similar commit in newer branches:
> dev.2024.12.11b
> dev.2024.12.12a
> dev.2024.12.13a
>
> if this is out-of-date version, please just ignore.
>
> the new config is enabled in our tests.
> ==================== PARENT FIRST_BAD KCONFIGS bb02a67f70d8d58c675403f1f716cf5885967918 ====================
> --- /pkg/linux/i386-randconfig-001-20241220/clang-19/bb02a67f70d8d58c675403f1f716cf5885967918/.config 2024-12-23 12:46:05.807021581 +0800
> +++ /pkg/linux/i386-randconfig-001-20241220/clang-19/774c4d7adb4f9134aa265c5fee4e8b07d98c53cb/.config 2024-12-23 14:26:59.938500419 +0800
> @@ -5864,6 +5864,7 @@ CONFIG_PROVE_RCU=y
> CONFIG_TORTURE_TEST=m
> CONFIG_RCU_SCALE_TEST=m
> CONFIG_RCU_TORTURE_TEST=m
> +CONFIG_RCU_TORTURE_TEST_CHK_RDR_STATE=m
> # CONFIG_RCU_TORTURE_TEST_LOG_CPU is not set
> CONFIG_RCU_REF_SCALE_TEST=m
> CONFIG_RCU_CPU_STALL_TIMEOUT=21
>
>
> and since the WARN added in this commit is hit, we just make below report FYI.
This one is a bug that has since been fixed. The condition:
cur_ops->readlock_nesting() > 0
Now reads:
cur_ops->readlock_nesting() == 0
The updated commit is:
14f8cc687ce6 ("rcutorture: Make rcutorture_one_extend() check reader state")
However, your Kconfig above does in fact show a bug. It is supposed
to be bool rather than tristate. I will fix with your Reported-by.
Thanx, Paul
> Hello,
>
> kernel test robot noticed "WARNING:at_kernel/rcu/rcutorture.c:#rcutorture_one_extend_check[rcutorture]" on:
>
> commit: 774c4d7adb4f9134aa265c5fee4e8b07d98c53cb ("rcutorture: Make rcutorture_one_extend() check reader state")
> https://github.com/paulmckrcu/linux dev.2024.12.11a
>
> in testcase: rcutorture
> version:
> with following parameters:
>
> runtime: 300s
> test: cpuhotplug
> torture_type: rcu
>
>
>
> config: i386-randconfig-001-20241220
> compiler: clang-19
> test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
>
> (please refer to attached dmesg/kmsg for entire log/backtrace)
>
>
> +-----------------------------------------------------------------------------+------------+------------+
> | | bb02a67f70 | 774c4d7adb |
> +-----------------------------------------------------------------------------+------------+------------+
> | WARNING:at_kernel/rcu/rcutorture.c:#rcutorture_one_extend_check[rcutorture] | 0 | 6 |
> | EIP:rcutorture_one_extend_check | 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@...el.com>
> | Closes: https://lore.kernel.org/oe-lkp/202412241458.150d082b-lkp@intel.com
>
>
> The kernel config and materials to reproduce are available at:
> https://download.01.org/0day-ci/archive/20241224/202412241458.150d082b-lkp@intel.com
>
>
> [ 216.715283][ T904] ------------[ cut here ]------------
> [ 216.715807][ T904] rcutorture_one_extend_check during change: Current 0x10 To add 0x10 To remove 0x0
> [ 216.716750][ T904] WARNING: CPU: 0 PID: 904 at kernel/rcu/rcutorture.c:1907 rcutorture_one_extend_check+0x1da/0x2a0 [rcutorture]
> [ 216.717867][ T904] Modules linked in: rcutorture(+) torture
> [ 216.718418][ T904] CPU: 0 UID: 0 PID: 904 Comm: rcu_torture_rea Not tainted 6.13.0-rc1-00040-g774c4d7adb4f #1 af41ae9ed56f032bf259b1a5e19207f049febebf
> [ 216.719655][ T904] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> [ 216.720591][ T904] EIP: rcutorture_one_extend_check+0x1da/0x2a0 [rcutorture]
> [ 216.721316][ T904] Code: 33 e9 88 f0 01 0f 85 19 ff ff ff c6 05 33 e9 88 f0 01 ff 75 0c 57 53 56 68 f0 70 90 f0 68 f8 7b 90 f0 e8 a9 ac 81 50 83 c4 18 <0f> 0b e9 f3 fe ff ff c6 05 2e e9 88 f0 01 ff 75 0c 57 53 56 68 f0
> [ 216.723166][ T904] EAX: 00000000 EBX: 00000010 ECX: 00000000 EDX: 00000000
> [ 216.723887][ T904] ESI: f090673c EDI: 00000010 EBP: bfba7d84 ESP: bfba7d70
> [ 216.724539][ T904] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010292
> [ 216.725236][ T904] CR0: 80050033 CR2: 37270010 CR3: 7a10e000 CR4: 000406d0
> [ 216.725919][ T904] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
> [ 216.726581][ T904] DR6: fffe0ff0 DR7: 00000400
> [ 216.727015][ T904] Call Trace:
> [ 216.727325][ T904] ? show_regs+0x5e/0x70
> [ 216.727761][ T904] ? rcutorture_one_extend_check+0x1da/0x2a0 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.728747][ T904] ? __warn+0xbc/0x230
> [ 216.729128][ T904] ? rcutorture_one_extend_check+0x1da/0x2a0 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.730100][ T904] ? rcutorture_one_extend_check+0x1da/0x2a0 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.731092][ T904] ? report_bug+0xb8/0x170
> [ 216.731558][ T904] ? exc_overflow+0x40/0x40
> [ 216.732002][ T904] ? handle_bug+0x49/0x70
> [ 216.732431][ T904] ? exc_invalid_op+0x24/0x50
> [ 216.732855][ T904] ? handle_exception+0x14d/0x14d
> [ 216.733294][ T904] ? __pr_flush+0x4b/0x390
> [ 216.733842][ T904] ? exc_overflow+0x40/0x40
> [ 216.734283][ T904] ? rcutorture_one_extend_check+0x1da/0x2a0 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.735278][ T904] ? exc_overflow+0x40/0x40
> [ 216.735710][ T904] ? rcutorture_one_extend_check+0x1da/0x2a0 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.736707][ T904] rcutorture_one_extend+0x185/0x3d0 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.737663][ T904] rcu_torture_one_read+0xbc/0x7b0 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.738651][ T904] ? __mod_timer+0x27e/0x330
> [ 216.746584][ T904] rcu_torture_reader+0xd9/0x1a0 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.749179][ T904] ? rcu_torture_boost_failed+0x200/0x200 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.751803][ T904] ? __kthread_parkme+0x41/0x90
> [ 216.752973][ T904] kthread+0xda/0xf0
> [ 216.753996][ T904] ? rcu_torture_fakewriter+0x3f0/0x3f0 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.756499][ T904] ? kthreadd+0x120/0x120
> [ 216.757734][ T904] ? kthreadd+0x120/0x120
> [ 216.758682][ T904] ret_from_fork+0x2c/0x40
> [ 216.759952][ T904] ret_from_fork_asm+0x12/0x20
> [ 216.761040][ T904] entry_INT80_32+0x10d/0x10d
> [ 216.762389][ T904] irq event stamp: 515
> [ 216.763447][ T904] hardirqs last enabled at (525): [<4111f4ef>] __console_unlock+0x5f/0x90
> [ 216.767137][ T904] hardirqs last disabled at (542): [<4111f4d6>] __console_unlock+0x46/0x90
> [ 216.769278][ T904] softirqs last enabled at (538): [<429843ea>] __do_softirq+0xa/0xe
> [ 216.771284][ T904] softirqs last disabled at (533): [<429843ea>] __do_softirq+0xa/0xe
> [ 216.773548][ T904] ---[ end trace 0000000000000000 ]---
> [ 216.774848][ T904] ------------[ cut here ]------------
> [ 216.776416][ T904] rcutorture_one_extend_check after change: Current 0x20 To add 0x20 To remove 0x4
> [ 216.778844][ T904] WARNING: CPU: 0 PID: 904 at kernel/rcu/rcutorture.c:1904 rcutorture_one_extend_check+0x286/0x2a0 [rcutorture]
> [ 216.781764][ T904] Modules linked in: rcutorture(+) torture
> [ 216.783330][ T904] CPU: 0 UID: 0 PID: 904 Comm: rcu_torture_rea Tainted: G W 6.13.0-rc1-00040-g774c4d7adb4f #1 af41ae9ed56f032bf259b1a5e19207f049febebf
> [ 216.787364][ T904] Tainted: [W]=WARN
> [ 216.787735][ T904] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> [ 216.788655][ T904] EIP: rcutorture_one_extend_check+0x286/0x2a0 [rcutorture]
> [ 216.789311][ T904] Code: 0f 84 12 ff ff ff e9 29 ff ff ff c6 05 32 e9 88 f0 01 ff 75 0c 57 53 56 68 f0 70 90 f0 68 f8 7b 90 f0 e8 fd ab 81 50 83 c4 18 <0f> 0b a1 14 a4 88 f0 e9 fe fe ff ff 00 00 00 00 00 00 00 00 00 00
> [ 216.791093][ T904] EAX: 00000000 EBX: 00000020 ECX: 00000000 EDX: 00000000
> [ 216.791732][ T904] ESI: f0905abc EDI: 00000020 EBP: bfba7d84 ESP: bfba7d70
> [ 216.792366][ T904] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010292
> [ 216.793054][ T904] CR0: 80050033 CR2: 37270010 CR3: 7a10e000 CR4: 000406d0
> [ 216.793757][ T904] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
> [ 216.794425][ T904] DR6: fffe0ff0 DR7: 00000400
> [ 216.794908][ T904] Call Trace:
> [ 216.795233][ T904] ? show_regs+0x5e/0x70
> [ 216.795648][ T904] ? rcutorture_one_extend_check+0x286/0x2a0 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.796617][ T904] ? __warn+0xbc/0x230
> [ 216.796983][ T904] ? rcutorture_one_extend_check+0x286/0x2a0 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.797941][ T904] ? rcutorture_one_extend_check+0x286/0x2a0 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.798994][ T904] ? report_bug+0xb8/0x170
> [ 216.799451][ T904] ? exc_overflow+0x40/0x40
> [ 216.799891][ T904] ? handle_bug+0x49/0x70
> [ 216.800322][ T904] ? exc_invalid_op+0x24/0x50
> [ 216.800793][ T904] ? handle_exception+0x14d/0x14d
> [ 216.801272][ T904] ? __pr_flush+0x4b/0x390
> [ 216.801697][ T904] ? exc_overflow+0x40/0x40
> [ 216.802126][ T904] ? rcutorture_one_extend_check+0x286/0x2a0 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.803118][ T904] ? exc_overflow+0x40/0x40
> [ 216.803584][ T904] ? rcutorture_one_extend_check+0x286/0x2a0 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.804577][ T904] rcutorture_one_extend+0x382/0x3d0 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.805520][ T904] rcu_torture_one_read+0x30d/0x7b0 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.806431][ T904] rcu_torture_reader+0xd9/0x1a0 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.807392][ T904] ? rcu_torture_boost_failed+0x200/0x200 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.808371][ T904] ? __kthread_parkme+0x41/0x90
> [ 216.808823][ T904] kthread+0xda/0xf0
> [ 216.809198][ T904] ? rcu_torture_fakewriter+0x3f0/0x3f0 [rcutorture 87513a79026a2b3af3a53e104b445ea32d45b3a4]
> [ 216.810157][ T904] ? kthreadd+0x120/0x120
> [ 216.810574][ T904] ? kthreadd+0x120/0x120
> [ 216.810983][ T904] ret_from_fork+0x2c/0x40
> [ 216.811391][ T904] ret_from_fork_asm+0x12/0x20
> [ 216.811834][ T904] entry_INT80_32+0x10d/0x10d
> [ 216.812322][ T904] irq event stamp: 1041
> [ 216.812701][ T904] hardirqs last enabled at (1051): [<4111f4ef>] __console_unlock+0x5f/0x90
> [ 216.813568][ T904] hardirqs last disabled at (1072): [<4111f4d6>] __console_unlock+0x46/0x90
> [ 216.814320][ T904] softirqs last enabled at (1070): [<429843ea>] __do_softirq+0xa/0xe
> [ 216.815071][ T904] softirqs last disabled at (1061): [<429843ea>] __do_softirq+0xa/0xe
> [ 216.815802][ T904] ---[ end trace 0000000000000000 ]---
> [ 216.817430][ T889] rcu-torture: Creating torture_shuffle task
> [ 216.818829][ T889] rcu-torture: Creating torture_stutter task
>
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
>
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