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Date: Mon, 8 Jan 2024 21:44:31 +0800
From: kernel test robot <oliver.sang@intel.com>
To: Jiri Wiesner <jwiesner@suse.de>
CC: <oe-lkp@lists.linux.dev>, <lkp@intel.com>, Feng Tang
	<feng.tang@intel.com>, <linux-kernel@vger.kernel.org>, John Stultz
	<jstultz@google.com>, Thomas Gleixner <tglx@linutronix.de>, Stephen Boyd
	<sboyd@kernel.org>, "Paul E. McKenney" <paulmck@kernel.org>,
	<oliver.sang@intel.com>
Subject: Re: [PATCH] clocksource: Skip watchdog check for large watchdog
 intervals
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Hello,

kernel test robot noticed "WARNING:at_kernel/time/clocksource-wdtest.c:#wdtest_func" on:

commit: ceacf0b27b5d9cdc574f8d0a0bcb11d3272e7b9f ("[PATCH] clocksource: Skip watchdog check for large watchdog intervals")
url: https://github.com/intel-lab-lkp/linux/commits/Jiri-Wiesner/clocksource-Skip-watchdog-check-for-large-watchdog-intervals/20240103-192257
base: https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git da65f29dada7f7cbbf0d6375b88a0316f5f7d6f5
patch link: https://lore.kernel.org/all/20240103112113.GA6108@incl/
patch subject: [PATCH] clocksource: Skip watchdog check for large watchdog intervals

in testcase: boot

compiler: gcc-9
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

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


+--------------------------------------------------------------------+------------+------------+
|                                                                    | da65f29dad | ceacf0b27b |
+--------------------------------------------------------------------+------------+------------+
| WARNING:at_kernel/time/clocksource-wdtest.c:#wdtest_func           | 0          | 14         |
| EIP:wdtest_func                                                    | 0          | 14         |
+--------------------------------------------------------------------+------------+------------+


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@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202401082125.4ec42f71-oliver.sang@intel.com


[   54.778895][   T41] ------------[ cut here ]------------
[ 54.781279][ T41] WARNING: CPU: 0 PID: 41 at kernel/time/clocksource-wdtest.c:162 wdtest_func (kernel/time/clocksource-wdtest.c:162 (discriminator 1)) 
[   54.785405][   T41] Modules linked in:
[   54.787152][   T41] CPU: 0 PID: 41 Comm: wdtest Tainted: G                 N 6.7.0-rc2-00014-gceacf0b27b5d #1 30e4ebd22e7da702dfdab1313ae74e5a246df970
[   54.791633][   T41] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 54.795124][ T41] EIP: wdtest_func (kernel/time/clocksource-wdtest.c:162 (discriminator 1)) 
[ 54.796800][ T41] Code: ff 8d b4 26 00 00 00 00 66 90 0f 0b e9 ee fd ff ff 8d b4 26 00 00 00 00 66 90 0f 0b e9 08 fe ff ff 8d b4 26 00 00 00 00 66 90 <0f> 0b e9 76 ff ff ff cc cc cc cc cc cc cc cc cc 3e 8d 74 26 00 55
All code
========
   0:	ff 8d b4 26 00 00    	decl   0x26b4(%rbp)
   6:	00 00                	add    %al,(%rax)
   8:	66 90                	xchg   %ax,%ax
   a:	0f 0b                	ud2    
   c:	e9 ee fd ff ff       	jmpq   0xfffffffffffffdff
  11:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  18:	66 90                	xchg   %ax,%ax
  1a:	0f 0b                	ud2    
  1c:	e9 08 fe ff ff       	jmpq   0xfffffffffffffe29
  21:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  28:	66 90                	xchg   %ax,%ax
  2a:*	0f 0b                	ud2    		<-- trapping instruction
  2c:	e9 76 ff ff ff       	jmpq   0xffffffffffffffa7
  31:	cc                   	int3   
  32:	cc                   	int3   
  33:	cc                   	int3   
  34:	cc                   	int3   
  35:	cc                   	int3   
  36:	cc                   	int3   
  37:	cc                   	int3   
  38:	cc                   	int3   
  39:	cc                   	int3   
  3a:	3e 8d 74 26 00       	lea    %ds:0x0(%rsi,%riz,1),%esi
  3f:	55                   	push   %rbp

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2    
   2:	e9 76 ff ff ff       	jmpq   0xffffffffffffff7d
   7:	cc                   	int3   
   8:	cc                   	int3   
   9:	cc                   	int3   
   a:	cc                   	int3   
   b:	cc                   	int3   
   c:	cc                   	int3   
   d:	cc                   	int3   
   e:	cc                   	int3   
   f:	cc                   	int3   
  10:	3e 8d 74 26 00       	lea    %ds:0x0(%rsi,%riz,1),%esi
  15:	55                   	push   %rbp
[   54.801794][   T41] EAX: c4a1fe8c EBX: 00000004 ECX: 00000000 EDX: 00000000
[   54.803569][   T41] ESI: c4a1ff2e EDI: 00000000 EBP: c74aff70 ESP: c74aff60
[   54.805314][   T41] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010246
[   54.807278][   T41] CR0: 80050033 CR2: ffda9000 CR3: 05979000 CR4: 000406d0
[   54.808856][   T41] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[   54.810216][   T41] DR6: fffe0ff0 DR7: 00000400
[   54.811218][   T41] Call Trace:
[ 54.811950][ T41] ? show_regs (arch/x86/kernel/dumpstack.c:479 arch/x86/kernel/dumpstack.c:465) 
[ 54.812840][ T41] ? wdtest_func (kernel/time/clocksource-wdtest.c:162 (discriminator 1)) 
[ 54.813801][ T41] ? __warn (kernel/panic.c:677) 
[ 54.814643][ T41] ? wdtest_func (kernel/time/clocksource-wdtest.c:162 (discriminator 1)) 
[ 54.815628][ T41] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 54.816581][ T41] ? exc_overflow (arch/x86/kernel/traps.c:250) 
[ 54.817506][ T41] ? handle_bug (arch/x86/kernel/traps.c:216) 
[ 54.818420][ T41] ? exc_invalid_op (arch/x86/kernel/traps.c:258 (discriminator 1)) 
[ 54.819425][ T41] ? handle_exception (arch/x86/entry/entry_32.S:1056) 
[ 54.820438][ T41] ? exc_overflow (arch/x86/kernel/traps.c:250) 
[ 54.821374][ T41] ? wdtest_func (kernel/time/clocksource-wdtest.c:162 (discriminator 1)) 
[ 54.822318][ T41] ? exc_overflow (arch/x86/kernel/traps.c:250) 
[ 54.823284][ T41] ? wdtest_func (kernel/time/clocksource-wdtest.c:162 (discriminator 1)) 
[ 54.824248][ T41] kthread (kernel/kthread.c:388) 
[ 54.825093][ T41] ? wdtest_ktime_read (kernel/time/clocksource-wdtest.c:105) 
[ 54.826132][ T41] ? kthread_complete_and_exit (kernel/kthread.c:341) 
[ 54.827307][ T41] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 54.828219][ T41] ? kthread_complete_and_exit (kernel/kthread.c:341) 
[ 54.829331][ T41] ret_from_fork_asm (arch/x86/entry/entry_32.S:741) 
[ 54.830310][ T41] entry_INT80_32 (arch/x86/entry/entry_32.S:947) 
[   54.831287][   T41] irq event stamp: 879
[ 54.832154][ T41] hardirqs last enabled at (889): console_unlock (kernel/printk/printk.c:341 kernel/printk/printk.c:2706 kernel/printk/printk.c:3038) 
[ 54.833838][ T41] hardirqs last disabled at (898): console_unlock (kernel/printk/printk.c:339 kernel/printk/printk.c:2706 kernel/printk/printk.c:3038) 
[ 54.835567][ T41] softirqs last enabled at (918): __do_softirq (arch/x86/include/asm/preempt.h:27 kernel/softirq.c:400 kernel/softirq.c:582) 
[ 54.837246][ T41] softirqs last disabled at (907): do_softirq_own_stack (arch/x86/kernel/irq_32.c:57 arch/x86/kernel/irq_32.c:147) 
[   54.839049][   T41] ---[ end trace 0000000000000000 ]---
[   54.840178][   T41] clocksource: Not enough CPUs to check clocksource 'wdtest-ktime'.
[   54.841774][   T41] clocksource_wdtest: --- Done with test.


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240108/202401082125.4ec42f71-oliver.sang@intel.com


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