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Date:   Mon, 17 Feb 2020 17:45:41 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     kernel test robot <lkp@...el.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        Tom Zanussi <zanussi@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [tracing] 1b6c0739c6:
 BUG:sleeping_function_called_from_invalid_context_at_mm/page_alloc.c

Hi,

I'm investigating this issue. This seems that my fix is not enough, there seems some other issues still in the test module.

Thank you,

On Mon, 17 Feb 2020 08:34:44 +0800
kernel test robot <lkp@...el.com> wrote:

> FYI, we noticed the following commit (built with gcc-7):
> 
> commit: 1b6c0739c611f3b5373e27571cc93064c423731d ("tracing: Skip software disabled event at __synth_event_trace_end()")
> https://github.com/0day-ci/linux/commits/Masami-Hiramatsu/tracing-Skip-software-disabled-event-at-__synth_event_trace_end/20200215-100354
> 
> in testcase: trinity
> with following parameters:
> 
> 	runtime: 300s
> 
> test-description: Trinity is a linux system call fuzz tester.
> test-url: http://codemonkey.org.uk/projects/trinity/
> 
> 
> on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G
> 
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> 
> 
> +-----------------------------------------------------------------------------+------------+------------+
> |                                                                             | 7276531d40 | 1b6c0739c6 |
> +-----------------------------------------------------------------------------+------------+------------+
> | boot_successes                                                              | 22         | 0          |
> | boot_failures                                                               | 0          | 22         |
> | BUG:sleeping_function_called_from_invalid_context_at_kernel/locking/mutex.c | 0          | 6          |
> | initcall_synth_event_gen_test_init_returned_with_preemption_imbalance       | 0          | 22         |
> | WARNING:at_init/main.c:#do_one_initcall                                     | 0          | 22         |
> | RIP:do_one_initcall                                                         | 0          | 22         |
> | BUG:sleeping_function_called_from_invalid_context_at_mm/page_alloc.c        | 0          | 16         |
> +-----------------------------------------------------------------------------+------------+------------+
> 
> 
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <lkp@...el.com>
> 
> 
> [    6.998544] BUG: sleeping function called from invalid context at mm/page_alloc.c:4695
> [    7.000227] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper/0
> [    7.001487] no locks held by swapper/0/1.
> [    7.002172] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.5.0-rc6-00098-g1b6c0739c611f #2
> [    7.003522] Call Trace:
> [    7.003962]  dump_stack+0x57/0x75
> [    7.004179]  ___might_sleep+0x111/0x120
> [    7.004179]  __might_sleep+0x68/0x70
> [    7.004179]  __alloc_pages_nodemask+0xe9/0x250
> [    7.004179]  ? test_empty_synth_event+0x1f/0x222
> [    7.004179]  slob_new_pages+0x13/0xa0
> [    7.004179]  slob_alloc+0x2b8/0x2e0
> [    7.004179]  ? test_empty_synth_event+0x1f/0x222
> [    7.004179]  __kmalloc+0x1cd/0x1f0
> [    7.004179]  ? test_empty_synth_event+0x222/0x222
> [    7.004179]  ? do_early_param+0x92/0x92
> [    7.004179]  test_empty_synth_event+0x1f/0x222
> [    7.004179]  ? print_synth_event+0x2c0/0x2c0
> [    7.004179]  ? test_empty_synth_event+0x222/0x222
> [    7.004179]  synth_event_gen_test_init+0x1d/0x3bd
> [    7.004179]  ? init_tracepoints+0x28/0x28
> [    7.004179]  ? do_early_param+0x92/0x92
> [    7.004179]  ? proc_create_data+0x3b/0x50
> [    7.004179]  ? proc_create+0xf/0x20
> [    7.004179]  do_one_initcall+0xae/0x210
> [    7.004179]  kernel_init_freeable+0x1e4/0x25c
> [    7.004179]  ? rest_init+0x140/0x140
> [    7.004179]  kernel_init+0x9/0x100
> [    7.004179]  ret_from_fork+0x35/0x40
> [    7.026429] ------------[ cut here ]------------
> [    7.027238] initcall synth_event_gen_test_init+0x0/0x3bd returned with preemption imbalance 
> [    7.028721] WARNING: CPU: 0 PID: 1 at init/main.c:1159 do_one_initcall+0x1c4/0x210
> [    7.030508] Modules linked in:
> [    7.031114] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G        W         5.5.0-rc6-00098-g1b6c0739c611f #2
> [    7.032901] RIP: 0010:do_one_initcall+0x1c4/0x210
> [    7.033805] Code: 40 00 00 00 48 c7 c6 a6 7a e2 81 e8 86 91 70 00 fb 80 7d a0 00 74 1d 48 8d 55 a0 4c 89 e6 48 c7 c7 b0 7e e2 81 e8 fc b2 09 00 <0f> 0b eb 06 41 bd ff ff ff ff 48 83 c4 40 44 89 e8 5b 41 5c 41 5d
> [    7.035098] RSP: 0000:ffffc90000013e98 EFLAGS: 00010292
> [    7.035098] RAX: 0000000000000050 RBX: 0000000000000000 RCX: 0000000000000000
> [    7.035098] RDX: 0000000000000000 RSI: 00000001a2f14e6c RDI: ffffffff82054880
> [    7.035098] RBP: ffffc90000013ef8 R08: 0000000000000001 R09: 0000000000000001
> [    7.035098] R10: 0000000000000010 R11: 0000000000000000 R12: ffffffff824b1bab
> [    7.035098] R13: 0000000000000000 R14: 0000000000000007 R15: ffffffff8248f6fd
> [    7.035098] FS:  0000000000000000(0000) GS:ffff888236a00000(0000) knlGS:0000000000000000
> [    7.035098] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    7.035098] CR2: 0000000000000000 CR3: 0000000002012000 CR4: 00000000000406f0
> [    7.035098] Call Trace:
> [    7.035098]  kernel_init_freeable+0x1e4/0x25c
> [    7.035098]  ? rest_init+0x140/0x140
> [    7.035098]  kernel_init+0x9/0x100
> [    7.035098]  ret_from_fork+0x35/0x40
> [    7.035098] ---[ end trace 0953bc968f723b18 ]---
> 
> 
> To reproduce:
> 
>         # build kernel
> 	cd linux
> 	cp config-5.5.0-rc6-00098-g1b6c0739c611f .config
> 	make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage
> 
>         git clone https://github.com/intel/lkp-tests.git
>         cd lkp-tests
>         bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email
> 
> 
> 
> Thanks,
> lkp
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>

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