gdb kernel 的常用命令
仔细看看这个，写的相当好了，不用自己瞎尝试了: https://docs.kernel.org/process/debugging/gdb-kernel-debugging.html
$ apropos lx
function lx_clk_core_lookup -- Find struct clk_core by name
function lx_current -- Return current task.
function lx_dentry_name -- Return string of the full path of a dentry.
function lx_device_find_by_bus_name -- Find struct device by bus and name (both strings)
function lx_device_find_by_class_name -- Find struct device by class and name (both strings)
function lx_i_dentry -- Return dentry pointer for inode.
function lx_module -- Find module by name and return the module variable.
function lx_per_cpu -- Return per-cpu variable.
function lx_per_cpu_ptr -- Return per-cpu pointer.
function lx_radix_tree_lookup -- Lookup and return a node from a RadixTree.
function lx_rb_first -- Lookup and return a node from an RBTree
function lx_rb_last -- Lookup and return a node from an RBTree.
function lx_rb_next -- Lookup and return a node from an RBTree.
function lx_rb_prev -- Lookup and return a node from an RBTree.
function lx_task_by_pid -- Find Linux task by PID and return the task_struct variable.
function lx_thread_info -- Calculate Linux thread_info from task variable.
function lx_thread_info_by_pid -- Calculate Linux thread_info from task variable found by pid
lx-clk-summary -- Print clk tree summary
lx-cmdline -- Report the Linux Commandline used in the current kernel.
lx-configdump -- Output kernel config to the filename specified as the command
lx-cpus -- List CPU status arrays
lx-device-list-bus -- Print devices on a bus (or all buses if not specified)
lx-device-list-class -- Print devices in a class (or all classes if not specified)
lx-device-list-tree -- Print a device and its children recursively
lx-dmesg -- Print Linux kernel log buffer.
lx-dump-page-owner -- Dump page owner
lx-fdtdump -- Output Flattened Device Tree header and dump FDT blob to the filename
lx-genpd-summary -- Print genpd summary
lx-getmod-by-textaddr -- Look up loaded kernel module by text address.
lx-interruptlist -- Print /proc/interrupts
lx-iomem -- Identify the IO memory resource locations defined by the kernel
lx-ioports -- Identify the IO port resource locations defined by the kernel
lx-list-check -- Verify a list consistency
lx-lsmod -- List currently loaded modules.
lx-mounts -- Report the VFS mounts of the current process namespace.
lx-page_address -- struct page to linear mapping address
lx-page_to_pfn -- struct page to PFN
lx-page_to_phys -- struct page to physical address
lx-pfn_to_kaddr -- PFN to kernel address
lx-pfn_to_page -- PFN to struct page
lx-ps -- Dump Linux tasks.
lx-slabinfo -- Show slabinfo
lx-slabtrace -- Show specific cache slabtrace
lx-stack_depot_lookup -- Search backtrace by handle
lx-sym_to_pfn -- symbol address to PFN
lx-symbols -- (Re-)load symbols of Linux kernel and currently loaded modules.
lx-timerlist -- Print /proc/timer_list
lx-version -- Report the Linux Version of the current kernel.
lx-virt_to_page -- virtual address to struct page
lx-virt_to_phys -- virtual address to physical address
lx-vmallocinfo -- Show vmallocinfo
info threads
检查每一个 vCPU 的 backtrace
Id Target Id Frame
1 Thread 1.1 (CPU#0 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
2 Thread 1.2 (CPU#1 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
3 Thread 1.3 (CPU#2 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
4 Thread 1.4 (CPU#3 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
5 Thread 1.5 (CPU#4 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
6 Thread 1.6 (CPU#5 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
7 Thread 1.7 (CPU#6 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
8 Thread 1.8 (CPU#7 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
9 Thread 1.9 (CPU#8 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
10 Thread 1.10 (CPU#9 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
11 Thread 1.11 (CPU#10 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
12 Thread 1.12 (CPU#11 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
13 Thread 1.13 (CPU#12 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
14 Thread 1.14 (CPU#13 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
15 Thread 1.15 (CPU#14 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
16 Thread 1.16 (CPU#15 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
17 Thread 1.17 (CPU#16 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
18 Thread 1.18 (CPU#17 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
19 Thread 1.19 (CPU#18 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
20 Thread 1.20 (CPU#19 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
21 Thread 1.21 (CPU#20 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
22 Thread 1.22 (CPU#21 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
23 Thread 1.23 (CPU#22 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
24 Thread 1.24 (CPU#23 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
25 Thread 1.25 (CPU#24 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
26 Thread 1.26 (CPU#25 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
27 Thread 1.27 (CPU#26 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
28 Thread 1.28 (CPU#27 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
29 Thread 1.29 (CPU#28 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
30 Thread 1.30 (CPU#29 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
31 Thread 1.31 (CPU#30 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
* 32 Thread 1.32 (CPU#31 [halted ]) 0xffffffff81cae88f in pv_native_safe_halt () at arch/x86/kernel/paravirt.c:82
加载模块的符号
错误的办法:
add-symbol-file drivers/block/virtio_blk.ko
add symbol table from file "drivers/block/virtio_blk.ko"
(y or n) y
Reading symbols from drivers/block/virtio_blk.ko...
$ info variables ^virtio
All variables matching regular expression "^virtio":
File drivers/block/virtio_blk.c:
1663: static struct virtio_driver virtio_blk;
1226: static const struct blk_mq_ops virtio_mq_ops;
File drivers/virtio/virtio.c:
438: static const struct bus_type virtio_bus;
64: static struct attribute *virtio_dev_attrs[6];
72: static const struct attribute_group virtio_dev_group;
72: static const struct attribute_group *virtio_dev_groups[2];
12: static struct ida virtio_index_ida;
File drivers/virtio/virtio_anchor.c:
16: bool (*virtio_check_mem_acc_cb)(struct virtio_device *);
File drivers/virtio/virtio_mmio.c:
793: static const struct acpi_device_id virtio_mmio_acpi_match[2];
522: static const struct virtio_config_ops virtio_mmio_config_ops;
800: static struct platform_driver virtio_mmio_driver;
786: static const struct of_device_id virtio_mmio_match[2];
556: static const struct dev_pm_ops virtio_mmio_pm_ops;
正确的办法，是使用 lx-symbols ，然后就可以观察到这个了:
- ret_from_fork_asm
- ret_from_fork
- kthread
- worker_thread
- process_scheduled_works
- process_one_work
- blk_mq_requeue_work
- blk_mq_run_hw_queues
- blk_mq_run_hw_queue
- blk_mq_sched_dispatch_requests
- __blk_mq_sched_dispatch_requests
- blk_mq_dispatch_rq_list
- virtio_queue_rq
- blk_mq_dispatch_rq_list
- __blk_mq_sched_dispatch_requests
- blk_mq_sched_dispatch_requests
- blk_mq_run_hw_queue
- blk_mq_run_hw_queues
- blk_mq_requeue_work
- process_one_work
- process_scheduled_works
- worker_thread
- kthread
- ret_from_fork
current
$ p $lx_current().pid
$1 = 292
$ p $lx_current().comm
$2 = "kworker/21:1H\000\000"
打印结构体
$ set $leftmost = $lx_per_cpu(hrtimer_bases).clock_base[0].active.rb_root.rb_leftmost
$ p *$container_of($leftmost, "struct hrtimer", "node")
$3 = {
node = {
node = {
__rb_parent_color = 18446612685234034192,
rb_right = 0x0 <__pfx_nft_chain_nat_init>,
rb_left = 0x0 <__pfx_nft_chain_nat_init>
},
expires = 166862000000
},
_softexpires = 166862000000,
function = 0xffffffff813fdae0 <tick_nohz_handler>,
base = 0xffff8880bc95c5c0,
state = 1 '\001',
is_rel = 0 '\000',
is_soft = 0 '\000',
is_hard = 1 '\001'
}
勉强能看的
https://duasynt.com/pub/gdb.pdf
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