Re: [linux-next:master] [maple_tree] 2041864a22: BUG:sleeping_function_called_from_invalid_context_at_include/linux/sched/mm.h

[Peng Zhang <zhangpeng.00@bytedance.com>]

在 2023/9/25 20:39, Jaeseon Sim 写道:
>> Hello,
>>
>> kernel test robot noticed "BUG:sleeping_function_called_from_invalid_context_at_include/linux/sched/mm.h" on:
>>
>> commit: 2041864a22d4f4e900d0a3def4985432a21d8e6d ("maple_tree: use mas_node_count_gfp() in mas_expected_entries()")
>> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
>>
>> [test failed on linux-next/master 940fcc189c51032dd0282cbee4497542c982ac59]
>>
>> 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)
>>
>>
>>
>> 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/202309242123.7ebe65b5-oliver.sang@intel.com
>>
>>
>> [  113.582828][    T1] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:306
>> [  113.583602][    T1] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1, name: swapper/0
>> [  113.584246][    T1] preempt_count: 1, expected: 0
>> [  113.584613][    T1] RCU nest depth: 0, expected: 0
>> [  113.584983][    T1] 1 lock held by swapper/0/1:
>> [ 113.585344][ T1] #0: ffffc9000001fc10 (&mt->ma_lock){+.+.}-{2:2}, at: check_forking+0x1e0/0x5c0
> Dear Liam,
> 
> mas_expected_entries() in check_forking() tried to sleep while holding spinlock, and panic occurred.
> I think mas_expected_entries() in lib/test_maple_tree.c need to be modified to align with commit 2041864a22d4f.
> Do you have any idea for it? or Could you give some guide?
This is just a test module. The work[1] I'm doing modifies this place
and it will fix this bug.
Thanks.

[1] 
https://lore.kernel.org/lkml/20230925035617.84767-1-zhangpeng.00@bytedance.com/
> 
> Thanks
> Jaeseon
>   
>> [  113.586160][    T1] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G                TN 6.6.0-rc2-00018-g2041864a22d4 #1
>> [  113.586924][    T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
>> [  113.587701][    T1] Call Trace:
>> [  113.587949][    T1]  <TASK>
>> [ 113.588172][ T1] dump_stack_lvl (lib/dump_stack.c:107)
>> [ 113.588540][ T1] dump_stack (lib/dump_stack.c:114)
>> [ 113.588668][ T1] __might_resched (kernel/sched/core.c:10188)
>> [ 113.588668][ T1] __might_sleep (kernel/sched/core.c:10117 (discriminator 17))
>> [ 113.588668][ T1] kmem_cache_alloc (include/linux/kernel.h:112 include/linux/sched/mm.h:306 mm/slab.h:709 mm/slub.c:3460 mm/slub.c:3486 mm/slub.c:3493 mm/slub.c:3502)
>> [ 113.588668][ T1] ? mas_alloc_nodes (lib/maple_tree.c:160 lib/maple_tree.c:1249)
>> [ 113.588668][ T1] mas_alloc_nodes (lib/maple_tree.c:160 lib/maple_tree.c:1249)
>> [ 113.588668][ T1] mas_node_count_gfp (lib/maple_tree.c:1331)
>> [ 113.588668][ T1] mas_expected_entries (lib/maple_tree.c:5580)
>> [ 113.588668][ T1] check_forking+0x205/0x5c0
>> [ 113.588668][ T1] ? check_mas_store_gfp+0x580/0x580
>> [ 113.588668][ T1] ? mt_destroy_walk (lib/maple_tree.c:5273)
>> [ 113.588668][ T1] ? mtree_destroy (lib/maple_tree.c:6392)
>> [ 113.588668][ T1] ? lock_downgrade (kernel/locking/lockdep.c:5761)
>> [ 113.588668][ T1] ? __raw_spin_lock_init (kernel/locking/spinlock_debug.c:26)
>> [ 113.588668][ T1] maple_tree_seed (lib/test_maple_tree.c:3584)
>> [ 113.588668][ T1] ? check_empty_area_window+0x3000/0x3000
>> [ 113.588668][ T1] ? trace_hardirqs_on (kernel/trace/trace_preemptirq.c:63 (discriminator 22))
>> [ 113.588668][ T1] ? write_comp_data (kernel/kcov.c:236)
>> [ 113.588668][ T1] ? check_empty_area_window+0x3000/0x3000
>> [ 113.588668][ T1] do_one_initcall (init/main.c:1232)
>> [ 113.588668][ T1] ? trace_event_raw_event_initcall_level (init/main.c:1223)
>> [ 113.588668][ T1] ? parameq (kernel/params.c:171)
>> [ 113.588668][ T1] ? __kasan_kmalloc (mm/kasan/common.c:384)
>> [ 113.588668][ T1] kernel_init_freeable (init/main.c:1293 init/main.c:1310 init/main.c:1329 init/main.c:1547)
>> [ 113.588668][ T1] ? rest_init (init/main.c:1429)
>> [ 113.588668][ T1] kernel_init (init/main.c:1439)
>> [ 113.588668][ T1] ? rest_init (init/main.c:1429)
>> [ 113.588668][ T1] ret_from_fork (arch/x86/kernel/process.c:153)
>> [ 113.588668][ T1] ? rest_init (init/main.c:1429)
>> [ 113.588668][ T1] ret_from_fork_asm (arch/x86/entry/entry_64.S:312)
>> [  113.588668][    T1]  </TASK>
>>
>>
>>
>> The kernel config and materials to reproduce are available at:
>> https://download.01.org/0day-ci/archive/20230924/202309242123.7ebe65b5-oliver.sang@intel.com
>>
>>
>>
>> -- 
>> 0-DAY CI Kernel Test Service
>> https://protect2.fireeye.com/v1/url?k=cc5f4a3e-add45f07-cc5ec171-000babffae10-d841b249634d3b66&q=1&e=af92f0ae-c873-480a-8f2b-9d5c35053b67&u=https%3A%2F%2Fgithub.com%2Fintel%2Flkp-tests%2Fwiki
>