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Date: Wed, 28 Feb 2024 10:47:02 +0800
From: kernel test robot <oliver.sang@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
CC: <oe-lkp@lists.linux.dev>, <lkp@intel.com>, Daniel Bristot de Oliveira
	<bristot@kernel.org>, <linux-kernel@vger.kernel.org>, <ltp@lists.linux.it>,
	<aubrey.li@linux.intel.com>, <yu.c.chen@intel.com>, <oliver.sang@intel.com>
Subject: [bristot:dl_server_v6] [sched/fair]  cf9fc54f9a:
 WARNING:at_kernel/sched/deadline.c:#pick_task_dl
Message-ID: <202402281042.5766096e-oliver.sang@intel.com>
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Hello,

kernel test robot noticed "WARNING:at_kernel/sched/deadline.c:#pick_task_dl" on:

commit: cf9fc54f9a409f1a16798041a034d28bfc95b451 ("sched/fair: Add trivial fair server")
git://git.kernel.org/cgit/linux/kernel/git/bristot/linux dl_server_v6

in testcase: ltp
version: ltp-x86_64-14c1f76-1_20240224
with following parameters:

	test: sched


compiler: gcc-12
test machine: 8 threads 1 sockets Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz (Ivy Bridge) with 16G memory

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


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/202402281042.5766096e-oliver.sang@intel.com


[  184.352299][ T4597] ------------[ cut here ]------------
[ 184.352603][ T4597] WARNING: CPU: 3 PID: 4597 at kernel/sched/deadline.c:2108 pick_task_dl (kernel/sched/deadline.c:2108 (discriminator 1)) 
[  184.352933][ T4597] Modules linked in: netconsole btrfs intel_rapl_msr blake2b_generic intel_rapl_common xor x86_pkg_temp_thermal raid6_pq intel_powerclamp zstd_compress coretemp libcrc32c kvm_intel kvm sd_mod t10_pi crc64_rocksoft_generic crc64_rocksoft crc64 irqbypass crct10dif_pclmul sg crc32_pclmul crc32c_intel ipmi_devintf ghash_clmulni_intel sha512_ssse3 ipmi_msghandler i915 rapl intel_cstate drm_buddy mxm_wmi intel_gtt firewire_ohci ahci drm_display_helper firewire_core libahci crc_itu_t intel_uncore ttm i2c_i801 libata drm_kms_helper i2c_smbus lpc_ich video wmi binfmt_misc drm loop fuse dm_mod ip_tables
[  184.354449][ T4597] CPU: 3 PID: 4597 Comm: cfs_bandwidth01 Not tainted 6.8.0-rc4-00015-gcf9fc54f9a40 #1
[  184.354767][ T4597] Hardware name:  /DZ77BH-55K, BIOS BHZ7710H.86A.0097.2012.1228.1346 12/28/2012
[ 184.355080][ T4597] RIP: 0010:pick_task_dl (kernel/sched/deadline.c:2108 (discriminator 1)) 
[ 184.355322][ T4597] Code: 00 00 00 49 8d bf e8 00 00 00 48 89 f8 48 c1 e8 03 80 3c 28 00 0f 85 02 01 00 00 4c 89 ff 41 ff 97 e8 00 00 00 48 85 c0 75 7f <0f> 0b 4c 89 f0 4c 89 f1 48 c1 e8 03 83 e1 07 0f b6 04 28 38 c8 7f
All code
========
   0:	00 00                	add    %al,(%rax)
   2:	00 49 8d             	add    %cl,-0x73(%rcx)
   5:	bf e8 00 00 00       	mov    $0xe8,%edi
   a:	48 89 f8             	mov    %rdi,%rax
   d:	48 c1 e8 03          	shr    $0x3,%rax
  11:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1)
  15:	0f 85 02 01 00 00    	jne    0x11d
  1b:	4c 89 ff             	mov    %r15,%rdi
  1e:	41 ff 97 e8 00 00 00 	callq  *0xe8(%r15)
  25:	48 85 c0             	test   %rax,%rax
  28:	75 7f                	jne    0xa9
  2a:*	0f 0b                	ud2    		<-- trapping instruction
  2c:	4c 89 f0             	mov    %r14,%rax
  2f:	4c 89 f1             	mov    %r14,%rcx
  32:	48 c1 e8 03          	shr    $0x3,%rax
  36:	83 e1 07             	and    $0x7,%ecx
  39:	0f b6 04 28          	movzbl (%rax,%rbp,1),%eax
  3d:	38 c8                	cmp    %cl,%al
  3f:	7f                   	.byte 0x7f

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2    
   2:	4c 89 f0             	mov    %r14,%rax
   5:	4c 89 f1             	mov    %r14,%rcx
   8:	48 c1 e8 03          	shr    $0x3,%rax
   c:	83 e1 07             	and    $0x7,%ecx
   f:	0f b6 04 28          	movzbl (%rax,%rbp,1),%eax
  13:	38 c8                	cmp    %cl,%al
  15:	7f                   	.byte 0x7f
[  184.355832][ T4597] RSP: 0018:ffffc9000b42fd40 EFLAGS: 00010046
[  184.356091][ T4597] RAX: 0000000000000000 RBX: ffff8883475c2c40 RCX: 0000000000000004
[  184.356368][ T4597] RDX: 1ffff11068eb859a RSI: 0000000000000000 RDI: 0000000000000000
[  184.356644][ T4597] RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000001
[  184.356923][ T4597] R10: ffff888143ec3847 R11: 0000000000000022 R12: ffffed1068eb86ae
[  184.357214][ T4597] R13: ffffed1068eb86af R14: ffff8883475c3624 R15: ffff8883475c35d0
[  184.357481][ T4597] FS:  00007fd1a24a8740(0000) GS:ffff888347580000(0000) knlGS:0000000000000000
[  184.357784][ T4597] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  184.358024][ T4597] CR2: 00005642dfcc3548 CR3: 00000004117e8002 CR4: 00000000001706f0
[  184.358293][ T4597] Call Trace:
[  184.358476][ T4597]  <TASK>
[ 184.358676][ T4597] ? __warn (kernel/panic.c:677) 
[ 184.358896][ T4597] ? pick_task_dl (kernel/sched/deadline.c:2108 (discriminator 1)) 
[ 184.359130][ T4597] ? report_bug (lib/bug.c:180 lib/bug.c:219) 
[ 184.359349][ T4597] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 184.359585][ T4597] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 184.359807][ T4597] ? asm_exc_invalid_op (arch/x86/include/asm/idtentry.h:568) 
[ 184.360040][ T4597] ? pick_task_dl (kernel/sched/deadline.c:2108 (discriminator 1)) 
[ 184.360268][ T4597] pick_next_task_dl (kernel/sched/deadline.c:2125) 
[ 184.360485][ T4597] __schedule (kernel/sched/core.c:6054 kernel/sched/core.c:6545 kernel/sched/core.c:6691) 
[ 184.360711][ T4597] ? io_schedule_timeout (kernel/sched/core.c:6608) 
[ 184.360930][ T4597] ? put_timespec64 (kernel/time/time.c:904) 
[ 184.361153][ T4597] ? __x64_sys_clock_gettime (kernel/time/posix-timers.c:1144 kernel/time/posix-timers.c:1132 kernel/time/posix-timers.c:1132) 
[ 184.361403][ T4597] schedule (arch/x86/include/asm/preempt.h:84 kernel/sched/core.c:6803 kernel/sched/core.c:6817) 
[ 184.361630][ T4597] syscall_exit_to_user_mode (kernel/entry/common.c:96 include/linux/entry-common.h:328 kernel/entry/common.c:201 kernel/entry/common.c:212) 
[ 184.361883][ T4597] do_syscall_64 (arch/x86/entry/common.c:102) 
[ 184.362109][ T4597] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[  184.362352][ T4597] RIP: 0033:0x7fd1a25ac719
[ 184.362566][ T4597] Code: 08 89 e8 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d b7 06 0d 00 f7 d8 64 89 01 48
All code
========
   0:	08 89 e8 5b 5d c3    	or     %cl,-0x3ca2a418(%rcx)
   6:	66 2e 0f 1f 84 00 00 	nopw   %cs:0x0(%rax,%rax,1)
   d:	00 00 00 
  10:	90                   	nop
  11:	48 89 f8             	mov    %rdi,%rax
  14:	48 89 f7             	mov    %rsi,%rdi
  17:	48 89 d6             	mov    %rdx,%rsi
  1a:	48 89 ca             	mov    %rcx,%rdx
  1d:	4d 89 c2             	mov    %r8,%r10
  20:	4d 89 c8             	mov    %r9,%r8
  23:	4c 8b 4c 24 08       	mov    0x8(%rsp),%r9
  28:	0f 05                	syscall 
  2a:*	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax		<-- trapping instruction
  30:	73 01                	jae    0x33
  32:	c3                   	retq   
  33:	48 8b 0d b7 06 0d 00 	mov    0xd06b7(%rip),%rcx        # 0xd06f1
  3a:	f7 d8                	neg    %eax
  3c:	64 89 01             	mov    %eax,%fs:(%rcx)
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax
   6:	73 01                	jae    0x9
   8:	c3                   	retq   
   9:	48 8b 0d b7 06 0d 00 	mov    0xd06b7(%rip),%rcx        # 0xd06c7
  10:	f7 d8                	neg    %eax
  12:	64 89 01             	mov    %eax,%fs:(%rcx)
  15:	48                   	rex.W
[  184.363083][ T4597] RSP: 002b:00007ffcb3621228 EFLAGS: 00000246 ORIG_RAX: 00000000000000e4
[  184.363381][ T4597] RAX: 0000000000000000 RBX: 00007ffcb3621290 RCX: 00007fd1a25ac719
[  184.363664][ T4597] RDX: 0000000000f52567 RSI: 00005642dfcc3548 RDI: 0000000000000004
[  184.363940][ T4597] RBP: 00005642dfc8db00 R08: 00007ffcb3621290 R09: 00007ffcb3621290
[  184.364221][ T4597] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000004
[  184.364494][ T4597] R13: 00005642dfc98069 R14: 00005642dfca9cb8 R15: 0000000000000000
[  184.364775][ T4597]  </TASK>
[  184.364953][ T4597] ---[ end trace 0000000000000000 ]---


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240228/202402281042.5766096e-oliver.sang@intel.com


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