Re: [PATCH] sched/fair: updates weight of cfs_rq before update_cfs_group() in enqueue_entity()
From: kernel test robot
Date: Mon Jun 03 2024 - 01:51:44 EST
Hello,
kernel test robot noticed "WARNING:at_kernel/sched/fair.c:#place_entity" on:
commit: 06d0c29c533e77cef4f1793343c78180b32645e0 ("[PATCH] sched/fair: updates weight of cfs_rq before update_cfs_group() in enqueue_entity()")
url: https://github.com/intel-lab-lkp/linux/commits/pugaowei/sched-fair-updates-weight-of-cfs_rq-before-update_cfs_group-in-enqueue_entity/20240531-111010
base: https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git 402de7fc880fef055bc984957454b532987e9ad0
patch link: https://lore.kernel.org/all/20240531030833.3375-1-pugaowei@xxxxxxxx/
patch subject: [PATCH] sched/fair: updates weight of cfs_rq before update_cfs_group() in enqueue_entity()
in testcase: boot
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)
+----------------------------------------------+------------+------------+
| | 402de7fc88 | 06d0c29c53 |
+----------------------------------------------+------------+------------+
| WARNING:at_kernel/sched/fair.c:#place_entity | 0 | 8 |
| RIP:place_entity | 0 | 8 |
+----------------------------------------------+------------+------------+
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/202406031240.f2476e94-oliver.sang@xxxxxxxxx
[ 0.400409][ T0] ------------[ cut here ]------------
[ 0.400603][ T0] WARNING: CPU: 0 PID: 0 at kernel/sched/fair.c:5256 place_entity (kernel/sched/fair.c:5256 (discriminator 1))
[ 0.400603][ T0] Modules linked in:
[ 0.400603][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.10.0-rc1-00003-g06d0c29c533e #1
[ 0.400603][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 0.400603][ T0] RIP: 0010:place_entity (kernel/sched/fair.c:5256 (discriminator 1))
[ 0.400603][ T0] Code: 29 c5 eb 82 b9 02 00 00 00 49 c1 ee 0a 49 39 ce 4c 0f 42 f1 49 8d 0c 16 eb d4 48 89 de e8 a0 5c ff ff 48 89 c7 e9 50 ff ff ff <0f> 0b eb d1 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90
All code
========
0: 29 c5 sub %eax,%ebp
2: eb 82 jmp 0xffffffffffffff86
4: b9 02 00 00 00 mov $0x2,%ecx
9: 49 c1 ee 0a shr $0xa,%r14
d: 49 39 ce cmp %rcx,%r14
10: 4c 0f 42 f1 cmovb %rcx,%r14
14: 49 8d 0c 16 lea (%r14,%rdx,1),%rcx
18: eb d4 jmp 0xffffffffffffffee
1a: 48 89 de mov %rbx,%rsi
1d: e8 a0 5c ff ff callq 0xffffffffffff5cc2
22: 48 89 c7 mov %rax,%rdi
25: e9 50 ff ff ff jmpq 0xffffffffffffff7a
2a:* 0f 0b ud2 <-- trapping instruction
2c: eb d1 jmp 0xffffffffffffffff
2e: 0f 1f 40 00 nopl 0x0(%rax)
32: 90 nop
33: 90 nop
34: 90 nop
35: 90 nop
36: 90 nop
37: 90 nop
38: 90 nop
39: 90 nop
3a: 90 nop
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop
3f: 90 nop
Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: eb d1 jmp 0xffffffffffffffd5
4: 0f 1f 40 00 nopl 0x0(%rax)
8: 90 nop
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
[ 0.400603][ T0] RSP: 0000:ffffffff8f403d38 EFLAGS: 00010046
[ 0.400603][ T0] RAX: 0000000000000000 RBX: ffff9a3e4026a880 RCX: 0000000000000400
[ 0.400603][ T0] RDX: 0000000000000000 RSI: fffffffffff00000 RDI: 00000000000b71b0
[ 0.400603][ T0] RBP: fffffffffff00000 R08: 0000000000000001 R09: 0000000000000000
[ 0.400603][ T0] R10: 0000000000000000 R11: 0000000094f4efa8 R12: ffff9a416fc348c0
[ 0.400603][ T0] R13: 0000000000000008 R14: 0000000000000400 R15: 0000000000000001
[ 0.400603][ T0] FS: 0000000000000000(0000) GS:ffff9a416fc00000(0000) knlGS:0000000000000000
[ 0.400603][ T0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 0.400603][ T0] CR2: ffff9a417ffff000 CR3: 00000001e4a1c000 CR4: 00000000000406f0
[ 0.400603][ T0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 0.400603][ T0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 0.400603][ T0] Call Trace:
[ 0.400603][ T0] <TASK>
[ 0.400603][ T0] ? __warn (kernel/panic.c:693)
[ 0.400603][ T0] ? place_entity (kernel/sched/fair.c:5256 (discriminator 1))
[ 0.400603][ T0] ? report_bug (lib/bug.c:180 lib/bug.c:219)
[ 0.400603][ T0] ? handle_bug (arch/x86/kernel/traps.c:239)
[ 0.400603][ T0] ? exc_invalid_op (arch/x86/kernel/traps.c:260 (discriminator 1))
[ 0.400603][ T0] ? asm_exc_invalid_op (arch/x86/include/asm/idtentry.h:621)
[ 0.400603][ T0] ? place_entity (kernel/sched/fair.c:5256 (discriminator 1))
[ 0.400603][ T0] ? place_entity (kernel/sched/fair.c:5182)
[ 0.400603][ T0] enqueue_entity (kernel/sched/fair.c:5328)
[ 0.400603][ T0] enqueue_task_fair (kernel/sched/fair.c:6785)
[ 0.400603][ T0] wake_up_new_task (kernel/sched/core.c:2015 (discriminator 2) kernel/sched/core.c:4693 (discriminator 2))
[ 0.400603][ T0] kernel_clone (kernel/fork.c:2831 (discriminator 1))
[ 0.400603][ T0] user_mode_thread (kernel/fork.c:2876)
[ 0.400603][ T0] ? __pfx_kernel_init (init/main.c:1459)
[ 0.400603][ T0] rest_init (init/main.c:712)
[ 0.400603][ T0] start_kernel (include/trace/events/initcall.h:27 init/main.c:1234 init/main.c:1001)
[ 0.400603][ T0] x86_64_start_reservations (arch/x86/kernel/head64.c:495)
[ 0.400603][ T0] x86_64_start_kernel (arch/x86/kernel/head64.c:437 (discriminator 5))
[ 0.400603][ T0] common_startup_64 (arch/x86/kernel/head_64.S:421)
[ 0.400603][ T0] </TASK>
[ 0.400603][ T0] ---[ end trace 0000000000000000 ]---
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240603/202406031240.f2476e94-oliver.sang@xxxxxxxxx
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki