Re: [tip:timers/urgent] [timers/migration] 8cdb61838e: WARNING:at_kernel/time/timer_migration.c:#tmigr_connect_child_parent

From: Paul E. McKenney
Date: Mon Jul 15 2024 - 19:15:01 EST

Next message: James Houghton: "Re: [PATCH v5 4/9] mm: Add test_clear_young_fast_only MMU notifier"
Previous message: Florian Klink: "[PATCH] ARM: dts: bcm283x: Fix hdmi hpd-gpio pin"
In reply to: kernel test robot: "[tip:timers/urgent] [timers/migration] 8cdb61838e: WARNING:at_kernel/time/timer_migration.c:#tmigr_connect_child_parent"
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On Wed, Jul 10, 2024 at 04:37:00PM +0800, kernel test robot wrote:
>
>
> Hello,
>
> kernel test robot noticed "WARNING:at_kernel/time/timer_migration.c:#tmigr_connect_child_parent" on:
>
> commit: 8cdb61838ee5c63556773ea2eed24deab6b15257 ("timers/migration: Move hierarchy setup into cpuhotplug prepare callback")
> https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git timers/urgent

For whatever it is worth, I am also seeing this on refscale runs on
recent -next.

The reproducer is to clone perfbook [1] in your ~/git directory
(as in ~/git/perfboot), then run this from your Linux source tree,
preferably on a system with few CPUs:

bash ~/git/perfbook/CodeSamples/defer/rcuscale.sh

The output will have "FAIL" in it, which indicates that the corresponding
guest OS splatted. If it would be useful, I would be happy to produce
a one-liner that runs the guest OS only once and leaves the console
output around. Otherwise, I will continue being lazy. ;-)

Thanx, Paul

[1] https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/perfbook.git

> [test failed on linux-next/master 82d01fe6ee52086035b201cfa1410a3b04384257]
>
> in testcase: filebench
> version: filebench-x86_64-22620e6-1_20240224
> with following parameters:
>
> disk: 1HDD
> fs: xfs
> test: randomwrite.f
> cpufreq_governor: performance
>
>
>
> compiler: gcc-13
> test machine: 128 threads 2 sockets Intel(R) Xeon(R) Platinum 8358 CPU @ 2.60GHz (Ice Lake) with 128G 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@xxxxxxxxx>
> | Closes: https://lore.kernel.org/oe-lkp/202407101636.d9d4e8be-oliver.sang@xxxxxxxxx
>
>
> [ 16.306955][ T209] ------------[ cut here ]------------
> [ 16.312287][ T209] WARNING: CPU: 32 PID: 209 at kernel/time/timer_migration.c:1620 tmigr_connect_child_parent (kernel/time/timer_migration.c:1620 (discriminator 7))
> [ 16.323148][ T209] Modules linked in:
> [ 16.326901][ T209] CPU: 32 PID: 209 Comm: cpuhp/32 Not tainted 6.10.0-rc6-00002-g8cdb61838ee5 #1
> [ 16.335766][ T209] RIP: 0010:tmigr_connect_child_parent (kernel/time/timer_migration.c:1620 (discriminator 7))
> [ 16.341945][ T209] Code: c6 07 00 0f 1f 00 fb 66 90 0f b6 45 60 48 89 e2 48 89 ee 48 89 df 88 44 24 18 e8 ec fc ff ff 84 c0 75 09 48 83 7b 08 00 74 02 <0f> 0b 48 8b 44 24 20 65 48 2b 04 25 28 00 00 00 75 36 48 83 c4 28
> All code
> ========
> 0: c6 07 00 movb $0x0,(%rdi)
> 3: 0f 1f 00 nopl (%rax)
> 6: fb sti
> 7: 66 90 xchg %ax,%ax
> 9: 0f b6 45 60 movzbl 0x60(%rbp),%eax
> d: 48 89 e2 mov %rsp,%rdx
> 10: 48 89 ee mov %rbp,%rsi
> 13: 48 89 df mov %rbx,%rdi
> 16: 88 44 24 18 mov %al,0x18(%rsp)
> 1a: e8 ec fc ff ff callq 0xfffffffffffffd0b
> 1f: 84 c0 test %al,%al
> 21: 75 09 jne 0x2c
> 23: 48 83 7b 08 00 cmpq $0x0,0x8(%rbx)
> 28: 74 02 je 0x2c
> 2a:* 0f 0b ud2 <-- trapping instruction
> 2c: 48 8b 44 24 20 mov 0x20(%rsp),%rax
> 31: 65 48 2b 04 25 28 00 sub %gs:0x28,%rax
> 38: 00 00
> 3a: 75 36 jne 0x72
> 3c: 48 83 c4 28 add $0x28,%rsp
>
> Code starting with the faulting instruction
> ===========================================
> 0: 0f 0b ud2
> 2: 48 8b 44 24 20 mov 0x20(%rsp),%rax
> 7: 65 48 2b 04 25 28 00 sub %gs:0x28,%rax
> e: 00 00
> 10: 75 36 jne 0x48
> 12: 48 83 c4 28 add $0x28,%rsp
> [ 16.361382][ T209] RSP: 0000:ffa0000007587da0 EFLAGS: 00010286
> [ 16.367302][ T209] RAX: 0000000000000000 RBX: ff11002000b56b00 RCX: 0000000000010101
> [ 16.375130][ T209] RDX: 0000000000010101 RSI: ff11002000b56b00 RDI: ff11002000b56b50
> [ 16.382955][ T209] RBP: ff11002000b57500 R08: 0000000000000101 R09: ffa0000007587da0
> [ 16.390782][ T209] R10: 0000000000000001 R11: 00000000c5672a10 R12: 0000000000000001
> [ 16.398608][ T209] R13: ff11001084311240 R14: 0000000000000020 R15: 0000000000000002
> [ 16.406433][ T209] FS: 0000000000000000(0000) GS:ff11001fffe00000(0000) knlGS:0000000000000000
> [ 16.415213][ T209] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 16.421650][ T209] CR2: 0000000000000000 CR3: 000000207de1c001 CR4: 0000000000771ef0
> [ 16.429477][ T209] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 16.437301][ T209] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 16.445128][ T209] PKRU: 55555554
> [ 16.448535][ T209] Call Trace:
> [ 16.451680][ T209] <TASK>
> [ 16.454479][ T209] ? __warn (kernel/panic.c:693)
> [ 16.458405][ T209] ? tmigr_connect_child_parent (kernel/time/timer_migration.c:1620 (discriminator 7))
> [ 16.463980][ T209] ? report_bug (lib/bug.c:180 lib/bug.c:219)
> [ 16.468338][ T209] ? handle_bug (arch/x86/kernel/traps.c:239)
> [ 16.472523][ T209] ? exc_invalid_op (arch/x86/kernel/traps.c:260 (discriminator 1))
> [ 16.477055][ T209] ? asm_exc_invalid_op (arch/x86/include/asm/idtentry.h:621)
> [ 16.481936][ T209] ? tmigr_connect_child_parent (kernel/time/timer_migration.c:1620 (discriminator 7))
> [ 16.487507][ T209] tmigr_setup_groups+0x1e6/0x430
> [ 16.492993][ T209] ? __pfx_tmigr_cpu_prepare (kernel/time/timer_migration.c:1727)
> [ 16.498305][ T209] tmigr_cpu_prepare (kernel/time/timer_migration.c:1721 kernel/time/timer_migration.c:1737)
> [ 16.502927][ T209] cpuhp_invoke_callback (kernel/cpu.c:194)
> [ 16.507980][ T209] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107)
> [ 16.513291][ T209] cpuhp_thread_fun (kernel/cpu.c:1092 (discriminator 1))
> [ 16.517910][ T209] smpboot_thread_fn (kernel/smpboot.c:164)
> [ 16.522615][ T209] kthread (kernel/kthread.c:389)
> [ 16.526367][ T209] ? __pfx_kthread (kernel/kthread.c:342)
> [ 16.530814][ T209] ret_from_fork (arch/x86/kernel/process.c:147)
> [ 16.535088][ T209] ? __pfx_kthread (kernel/kthread.c:342)
> [ 16.539533][ T209] ret_from_fork_asm (arch/x86/entry/entry_64.S:257)
> [ 16.544153][ T209] </TASK>
> [ 16.547039][ T209] ---[ end trace 0000000000000000 ]---
> [ 16.562459][ T1] Timer migration setup failed
>
>
>
> The kernel config and materials to reproduce are available at:
> https://download.01.org/0day-ci/archive/20240710/202407101636.d9d4e8be-oliver.sang@xxxxxxxxx
>
>
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
>

Next message: James Houghton: "Re: [PATCH v5 4/9] mm: Add test_clear_young_fast_only MMU notifier"
Previous message: Florian Klink: "[PATCH] ARM: dts: bcm283x: Fix hdmi hpd-gpio pin"
In reply to: kernel test robot: "[tip:timers/urgent] [timers/migration] 8cdb61838e: WARNING:at_kernel/time/timer_migration.c:#tmigr_connect_child_parent"
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