exception/hard IRQ/soft IRQ stack

 hardware stack: hardirt_stack array
 softIRQ stack: softirt_stack array

$(CROSS_COMPILE)objdump -d vmlinux | scripts/checkstack.pl [arch]

$ arm-eabi-objdummp -d vmlinux -o vmlinux-arm.S $ cat vmlinux-arm.S | scripts/checkstack.pl arm

0x0012c858 nlmclnt_reclaim [vmlinux-arm.o]:             720
0x0025748c do_tcp_getsockopt.clone.11 [vmlinux-arm.o]:  552
0x00258d04 do_tcp_setsockopt.clone.14 [vmlinux-arm.o]:  544
0x000b2db4 do_sys_poll [vmlinux-arm.o]:                 532
0x00138744 semctl_main.clone.7 [vmlinux-arm.o]:         532
0x00138ec4 sys_semtimedop [vmlinux-arm.o]:              484
0x000c5618 default_file_splice_read [vmlinux-arm.o]:    436
0x00251de4 do_ip_setsockopt.clone.22 [vmlinux-arm.o]:   416
0x00191fd4 extract_buf [vmlinux-arm.o]:                 408
0x0019bc24 loop_get_status_old [vmlinux-arm.o]:         396
0x000e6f88 do_task_stat [vmlinux-arm.o]:                380
0x0019b8f0 loop_set_status_old [vmlinux-arm.o]:         380
0x002078f0 snd_ctl_elem_add_user [vmlinux-arm.o]:       376
0x0026267c tcp_make_synack [vmlinux-arm.o]:             372
0x00127be4 nfs_dns_parse [vmlinux-arm.o]:               368
0x000b2240 do_select [vmlinux-arm.o]:                   340
0x001f6f10 mmc_blk_issue_rw_rq [vmlinux-arm.o]:         340
0x001726a0 fb_set_var [vmlinux-arm.o]:                  336
0x000c58d0 __generic_file_splice_read [vmlinux-arm.o]:  316
0x0022a074 dev_seq_printf_stats [vmlinux-arm.o]:        316
0x0006383c tracing_splice_read_pipe [vmlinux-arm.o]:    308
0x000c53c8 vmsplice_to_pipe [vmlinux-arm.o]:            308
0x002512b4 do_ip_getsockopt [vmlinux-arm.o]:            304
0x00225f68 skb_splice_bits [vmlinux-arm.o]:             300

Below are some results for static analysis of function stack depth in the Linux kernel, using 'stack_size'. (stack_size is a custom tool written by Tim Bird, before he found out about checkstack.pl.) https://lkml.org/lkml/2011/10/18/479

$ ./stack_size vmlinux-arm

============ RESULTS ===============
number of functions     = 14371
max function stack depth= 736
function with max depth = nlmclnt_reclaim

Function Name                    Stack Depth
=====================            ===========
__generic_file_splice_read        352
do_select                         376
loop_set_status_old               392
snd_ctl_elem_add_user             408
extract_buf                       432
default_file_splice_read          472
sys_semtimedop                    520
semctl_main.clone.7               560
do_sys_poll                       568
nlmclnt_reclaim                   736

# dmesg | grep greatest

                                                
kworker/u:0 used greatest stack depth: 10564 bytes left                         
busybox used greatest stack depth: 9512 bytes left                              
busybox used greatest stack depth: 9504 bytes left                              
grep used greatest stack depth: 9372 bytes left                                 
init used greatest stack depth: 9028 bytes left

#echo t >/proc/sysrq-trigger #dmesg | grep -v [[]

 task                PC stack   pid father
init            S 802af8b0   932     1      0 0x00000000
kthreadd        S 802af8b0  2496     2      0 0x00000000
ksoftirqd/0     S 802af8b0  2840     3      2 0x00000000
kworker/0:0     S 802af8b0  2776     4      2 0x00000000
kworker/u:0     S 802af8b0  2548     5      2 0x00000000
migration/0     S 802af8b0  2704     6      2 0x00000000
migration/1     S 802af8b0  2704     7      2 0x00000000
kworker/1:0     S 802af8b0  2560     8      2 0x00000000
ksoftirqd/1     S 802af8b0  3024     9      2 0x00000000
khelper         S 802af8b0  2824    10      2 0x00000000
sync_supers     S 802af8b0  2872    11      2 0x00000000
bdi-default     S 802af8b0  2584    12      2 0x00000000
kblockd         S 802af8b0  2824    13      2 0x00000000
khubd           S 802af8b0  2744    14      2 0x00000000