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SubjectRe: [RFC 2/3] arm64: refactor save_stack_trace()
On Tue, 14 Jul 2015 21:47:10 +0900
Jungseok Lee <jungseoklee85@gmail.com> wrote:

> Is the below example an unexpected result?
> Entry 17 and 18 are ftrace_call and ftrace_ops_no_ops, respectively.
>
> Depth Size Location (51 entries)
> ----- ---- --------
> 0) 5352 96 _raw_spin_unlock_irqrestore+0x1c/0x60
> 1) 5256 48 gic_raise_softirq+0xa0/0xbc
> 2) 5208 80 smp_cross_call+0x40/0xbc
> 3) 5128 48 smp_send_reschedule+0x38/0x48
> 4) 5080 32 trigger_load_balance+0x184/0x29c
> 5) 5048 112 scheduler_tick+0xac/0x104
> 6) 4936 64 update_process_times+0x5c/0x74
> 7) 4872 32 tick_sched_handle.isra.15+0x38/0x7c
> 8) 4840 48 tick_sched_timer+0x48/0x90
> 9) 4792 48 __run_hrtimer+0x60/0x258
> 10) 4744 64 hrtimer_interrupt+0xe8/0x260
> 11) 4680 128 arch_timer_handler_virt+0x38/0x48
> 12) 4552 32 handle_percpu_devid_irq+0x84/0x188
> 13) 4520 64 generic_handle_irq+0x38/0x54
> 14) 4456 32 __handle_domain_irq+0x68/0xbc
> 15) 4424 64 gic_handle_irq+0x38/0x88
> 16) 4360 280 el1_irq+0x64/0xd8

Note, function tracing does not disable interrupts. This looks to be
that an interrupt came in while __aloc_skb() was being traced.

-- Steve

> 17) 4080 168 ftrace_ops_no_ops+0xb4/0x16c
> 18) 3912 32 ftrace_call+0x0/0x4
> 19) 3880 144 __alloc_skb+0x48/0x180
> 20) 3736 96 alloc_skb_with_frags+0x74/0x234
> 21) 3640 112 sock_alloc_send_pskb+0x1d0/0x294
> 22) 3528 160 sock_alloc_send_skb+0x44/0x54
> 23) 3368 64 __ip_append_data.isra.40+0x78c/0xb48
> 24) 3304 224 ip_append_data.part.42+0x98/0xe8
> 25) 3080 112 ip_append_data+0x68/0x7c
> 26) 2968 96 icmp_push_reply+0x7c/0x144
> 27) 2872 96 icmp_send+0x3c0/0x3c8
> 28) 2776 192 __udp4_lib_rcv+0x5b8/0x684
> 29) 2584 96 udp_rcv+0x2c/0x3c
> 30) 2488 32 ip_local_deliver+0xa0/0x224
> 31) 2456 48 ip_rcv+0x360/0x57c
> 32) 2408 64 __netif_receive_skb_core+0x4d0/0x80c
> 33) 2344 128 __netif_receive_skb+0x24/0x84
> 34) 2216 32 process_backlog+0x9c/0x15c
> 35) 2184 80 net_rx_action+0x1ec/0x32c
> 36) 2104 160 __do_softirq+0x114/0x2f0
> 37) 1944 128 do_softirq+0x60/0x68
> 38) 1816 32 __local_bh_enable_ip+0xb0/0xd4
> 39) 1784 32 ip_finish_output+0x1f4/0xabc
> 40) 1752 96 ip_output+0xf0/0x120
> 41) 1656 64 ip_local_out_sk+0x44/0x54
> 42) 1592 32 ip_send_skb+0x24/0xbc
> 43) 1560 48 udp_send_skb+0x1b4/0x2f4
> 44) 1512 80 udp_sendmsg+0x2a8/0x7a0
> 45) 1432 272 inet_sendmsg+0xa0/0xd0
> 46) 1160 48 sock_sendmsg+0x30/0x78
> 47) 1112 32 ___sys_sendmsg+0x15c/0x26c
> 48) 1080 400 __sys_sendmmsg+0x94/0x180
> 49) 680 320 SyS_sendmmsg+0x38/0x54
> 50) 360 360 el0_svc_naked+0x20/0x28
>
> Best Regards
> Jungseok Lee



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