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SubjectRe: [PATCH] blk-iocost: initialize rqos before accessing it
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Hello Michal,

On 2/24/23 18:51, Michal Koutný wrote:
>> blk_iocost_init (include/asm-generic/qspinlock.h:128
>> include/linux/spinlock.h:203
>> include/linux/spinlock_api_smp.h:158
>> include/linux/spinlock.h:400
>> block/blk-iocost.c:2884)
>> ioc_qos_write (block/blk-iocost.c:3198)
>> ? kretprobe_perf_func (kernel/trace/trace_kprobe.c:1566)
>> ? kernfs_fop_write_iter (include/linux/slab.h:584 fs/kernfs/file.c:311)
>> ? __kmem_cache_alloc_node (mm/slab.h:? mm/slub.c:3452 mm/slub.c:3491)
>> ? _copy_from_iter (arch/x86/include/asm/uaccess_64.h:46
>> arch/x86/include/asm/uaccess_64.h:52
>> lib/iov_iter.c:183 lib/iov_iter.c:628)
>> ? kretprobe_dispatcher (kernel/trace/trace_kprobe.c:1693)
>> cgroup_file_write (kernel/cgroup/cgroup.c:4061)
>> kernfs_fop_write_iter (fs/kernfs/file.c:334)
>> vfs_write (include/linux/fs.h:1849 fs/read_write.c:491
>> fs/read_write.c:584)
>> ksys_write (fs/read_write.c:637)
>> do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80)
>> entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120)
>
> BTW, out of curiosity what tool did you use to list stack with line
> numbers?

I use the decode_stacktrace.sh from kernel's scripts directory. You
basically
pipe the stack to it, and call it passing the vmlinux file. It is
incredible handy.

https://elixir.bootlin.com/linux/latest/source/scripts/decode_stacktrace.sh

Thanks for the review,
Breno

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