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Subjectftrace on MIPS/ath79
Date
Hi,
I'm currently trying to debug a performance bottleneck on low-end ath79
hardware running OpenWrt/LEDE, but it seems that ftrace is not working
correctly on these systems. I have tried this with recent 4.4.y and 4.9.y
with similar results; unfortunately, switching to a newer kernel is not
easily possible on this hardware at the moment. Please let me know if there
are any known issues or patches that I should backport.

There seem to be two separate issues:

1) Building with CONFIG_DYNAMIC_FTRACE leads to a kernel panic as soon as
kernel modules are loaded (logs attached).

2) function_graph tracer does not show anything useful: the trace output
looks like what was reported in [1]. Building with
CONFIG_FUNCTION_GRAPH_TRACER leads to a completely empty
trace_stat/function0 (except for the header); profiling is working as
expected when CONFIG_FUNCTION_GRAPH_TRACER is disabled.

I would be thankful for any pointers that might help me to make this work.

Kind regards,
Matthias


[1] https://www.linux-mips.org/archives/linux-mips/2014-11/msg00295.html

[ 0.000000] Linux version 4.4.120 (neoraider@avalon) (gcc version 5.4.0 (LEDE GCC 5.4.0 r3826+66-2e26bdfeca2f) ) #0 Sun Mar 4 09:26:34 2018
[ 0.000000] bootconsole [early0] enabled
[ 0.000000] CPU0 revision is: 0001974c (MIPS 74Kc)
[ 0.000000] SoC: Atheros AR9344 rev 2
[ 0.000000] Determined physical RAM map:
[ 0.000000] memory: 08000000 @ 00000000 (usable)
[ 0.000000] Initrd not found or empty - disabling initrd
[ 0.000000] No valid device tree found, continuing without
[ 0.000000] Zone ranges:
[ 0.000000] Normal [mem 0x0000000000000000-0x0000000007ffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000000000000-0x0000000007ffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000007ffffff]
[ 0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes.
[ 0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases, linesize 32 bytes
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 32512
[ 0.000000] Kernel command line: board=TL-WDR4300 console=ttyS0,115200 rootfstype=squashfs,jffs2 noinitrd
[ 0.000000] PID hash table entries: 512 (order: -1, 2048 bytes)
[ 0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
[ 0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
[ 0.000000] Writing ErrCtl register=00000000
[ 0.000000] Readback ErrCtl register=00000000
[ 0.000000] Memory: 122112K/131072K available (3536K kernel code, 236K rwdata, 876K rodata, 2512K init, 222K bss, 8960K reserved, 0K cma-reserved)
[ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] NR_IRQS:51
[ 0.000000] Clocks: CPU:560.000MHz, DDR:450.000MHz, AHB:225.000MHz, Ref:40.000MHz
[ 0.000000] clocksource: MIPS: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 6825930166 ns
[ 0.000009] sched_clock: 32 bits at 280MHz, resolution 3ns, wraps every 7669584382ns
[ 0.008301] Calibrating delay loop... 278.93 BogoMIPS (lpj=1394688)
[ 0.081147] pid_max: default: 32768 minimum: 301
[ 0.086191] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.093235] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.101551] ftrace: allocating 13717 entries in 27 pages
[ 0.141788] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.152314] futex hash table entries: 256 (order: -1, 3072 bytes)
[ 0.160139] NET: Registered protocol family 16
[ 0.166372] MIPS: machine is TP-LINK TL-WDR3600/4300/4310
[ 0.175495] registering PCI controller with io_map_base unset
[ 0.413427] PCI host bridge to bus 0000:00
[ 0.417847] pci_bus 0000:00: root bus resource [mem 0x10000000-0x13ffffff]
[ 0.425158] pci_bus 0000:00: root bus resource [io 0x0000]
[ 0.431102] pci_bus 0000:00: root bus resource [??? 0x00000000 flags 0x0]
[ 0.438322] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[ 0.446838] pci 0000:00:00.0: invalid calibration data
[ 0.452755] pci 0000:00:00.0: BAR 0: assigned [mem 0x10000000-0x1001ffff 64bit]
[ 0.460588] pci 0000:00:00.0: BAR 6: assigned [mem 0x10020000-0x1002ffff pref]
[ 0.468283] pci 0000:00:00.0: using irq 40 for pin 1
[ 0.474503] clocksource: Switched to clocksource MIPS
[ 0.492881] NET: Registered protocol family 2
[ 0.498489] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.505964] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.512730] TCP: Hash tables configured (established 1024 bind 1024)
[ 0.519588] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 0.525849] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 0.532802] NET: Registered protocol family 1
[ 3.491323] Crashlog allocated RAM at address 0x3f00000
[ 3.512937] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 3.519209] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 3.532438] io scheduler noop registered
[ 3.536672] io scheduler deadline registered (default)
[ 3.542475] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[ 3.552135] console [ttyS0] disabled
[ 3.576029] serial8250.0: ttyS0 at MMIO 0x18020000 (irq = 11, base_baud = 2500000) is a 16550A
[ 3.585215] console [ttyS0] enabled
[ 3.585215] console [ttyS0] enabled
[ 3.592627] bootconsole [early0] disabled
[ 3.592627] bootconsole [early0] disabled
[ 3.606728] m25p80 spi0.0: found s25fl064k, expected m25p80
[ 3.621987] m25p80 spi0.0: s25fl064k (8192 Kbytes)
[ 3.627199] 5 tp-link partitions found on MTD device spi0.0
[ 3.632853] Creating 5 MTD partitions on "spi0.0":
[ 3.637755] 0x000000000000-0x000000020000 : "u-boot"
[ 3.644264] 0x000000020000-0x00000016d1cc : "kernel"
[ 3.651059] 0x00000016d1cc-0x0000007f0000 : "rootfs"
[ 3.657839] mtd: device 2 (rootfs) set to be root filesystem
[ 3.663620] 1 squashfs-split partitions found on MTD device rootfs
[ 3.669947] 0x0000003b0000-0x0000007f0000 : "rootfs_data"
[ 3.677140] 0x0000007f0000-0x000000800000 : "art"
[ 3.683646] 0x000000020000-0x0000007f0000 : "firmware"
[ 3.698630] switch0: Atheros AR8327 rev. 2 switch registered on ag71xx-mdio.0
[ 4.307004] libphy: ag71xx_mdio: probed
[ 4.895898] ag71xx ag71xx.0: connected to PHY at ag71xx-mdio.0:00 [uid=004dd033, driver=Atheros AR8216/AR8236/AR8316]
[ 4.907372] eth0: Atheros AG71xx at 0xb9000000, irq 4, mode:RGMII
[ 4.915955] NET: Registered protocol family 10
[ 4.924368] NET: Registered protocol family 17
[ 4.929020] bridge: automatic filtering via arp/ip/ip6tables has been deprecated. Update your scripts to load br_netfilter if you need this.
[ 4.941959] 8021q: 802.1Q VLAN Support v1.8
[ 4.960066] Freeing unused kernel memory: 2512K
[ 4.978378] init: Console is alive
[ 4.982051] init: - watchdog -
[ 5.011447] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[ 5.022075] CPU 0 Unable to handle kernel paging request at virtual address 0000005c, epc == 800cd330, ra == 801c69e4
[ 5.032906] Oops[#1]:
[ 5.035220] CPU: 0 PID: 338 Comm: kmodloader Not tainted 4.4.120 #0
[ 5.041577] task: 87e032f0 ti: 87e36000 task.ti: 87e36000
[ 5.047046] $ 0 : 00000000 801c69e4 00000001 00000000
[ 5.052378] $ 4 : 0000005c 8046543c 80760000 00000000
[ 5.057710] $ 8 : 00000000 00000000 00000001 0000000a
[ 5.063044] $12 : 0000000c 001f0040 00000000 61736800
[ 5.068376] $16 : 87e39a00 87e39a00 801c69e4 804d0000
[ 5.073709] $20 : 00000000 00000000 00000012 024000c0
[ 5.079042] $24 : 00000008 800798b4
[ 5.084374] $28 : 87e36000 87e37ca0 800cd764 801c69e4
[ 5.089709] Hi : 004ab5e4
[ 5.092630] Lo : 25e74934
[ 5.095569] epc : 800cd330 try_module_get+0x28/0xe4
[ 5.100711] ra : 801c69e4 crypto_mod_get+0x24/0x5c
[ 5.105830] Status: 1100d403 KERNEL EXL IE
[ 5.110100] Cause : 00800008 (ExcCode 02)
[ 5.114164] BadVA : 0000005c
[ 5.117086] PrId : 0001974c (MIPS 74Kc)
[ 5.121062] Modules linked in: crc32c_generic(+) crypto_hash
[ 5.126824] Process kmodloader (pid: 338, threadinfo=87e36000, task=87e032f0, tls=77eabd48)
[ 5.135291] Stack : 00000417 87e39a28 00000000 801c6cc8 87e39a00 87e39a00 804d619c 801c69e4
801fe790 ffffffef 87e39a00 804d619c 87e3f000 801c84b4 87e3a000 87e39800
00000100 00000200 87e032f0 87e39a00 804d0000 87e39800 804b0000 801c93fc
87de49b0 87de49b0 00000000 00000001 87e39900 87e39900 87e3a000 80060aa8
87cb5800 800a7060 87e3a000 00001df2 87e3b448 804d0000 00000000 87cec00c
...
[ 5.171618] Call Trace:
[ 5.174107] [<800cd330>] try_module_get+0x28/0xe4
[ 5.178880] [<801c69e4>] crypto_mod_get+0x24/0x5c
[ 5.183662] [<801c84b4>] __crypto_register_alg+0x148/0x1cc
[ 5.189232] [<801c93fc>] crypto_register_alg+0x50/0x88
[ 5.194446] [<80060aa8>] do_one_initcall+0x1f0/0x228
[ 5.199487] [<800fcf18>] do_init_module+0x84/0x1ec
[ 5.204358] [<800d05b8>] load_module+0x1834/0x1ce0
[ 5.209221] [<800d0b88>] SyS_init_module+0x124/0x174
[ 5.214273] [<8007016c>] syscall_common+0x30/0x54
[ 5.219044]
[ 5.220554]
Code: 00000000 10800029 03e09021 <8c830000> 24020002 14620003 00000000 10000021 00001021
[ 5.230711] ---[ end trace 830c7245ad7ebbf1 ]---
[ 5.236618] Fatal exception: panic in 5 seconds
[ 10.244516] Kernel panic - not syncing: Fatal exception
[ 10.251059] Rebooting in 1 seconds..

[ 0.000000] Linux version 4.9.87 (neoraider@avalon) (gcc version 7.3.0 (OpenWrt GCC 7.3.0 r6475+7-96288dc13912) ) #0 Sun Mar 4 09:26:34 2018
[ 0.000000] bootconsole [early0] enabled
[ 0.000000] CPU0 revision is: 0001974c (MIPS 74Kc)
[ 0.000000] SoC: Atheros AR9344 rev 2
[ 0.000000] Determined physical RAM map:
[ 0.000000] memory: 08000000 @ 00000000 (usable)
[ 0.000000] Initrd not found or empty - disabling initrd
[ 0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes.
[ 0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases, linesize 32 bytes
[ 0.000000] Zone ranges:
[ 0.000000] Normal [mem 0x0000000000000000-0x0000000007ffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000000000000-0x0000000007ffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000007ffffff]
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 32512
[ 0.000000] Kernel command line: board=TL-WDR4300 console=ttyS0,115200 rootfstype=squashfs noinitrd
[ 0.000000] PID hash table entries: 512 (order: -1, 2048 bytes)
[ 0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
[ 0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
[ 0.000000] Writing ErrCtl register=00000000
[ 0.000000] Readback ErrCtl register=00000000
[ 0.000000] Memory: 121780K/131072K available (3746K kernel code, 253K rwdata, 912K rodata, 2568K init, 233K bss, 9292K reserved, 0K cma-reserved)
[ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] NR_IRQS:51
[ 0.000000] Clocks: CPU:560.000MHz, DDR:450.000MHz, AHB:225.000MHz, Ref:40.000MHz
[ 0.000000] clocksource: MIPS: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 6825930166 ns
[ 0.000009] sched_clock: 32 bits at 280MHz, resolution 3ns, wraps every 7669584382ns
[ 0.008310] Calibrating delay loop... 278.93 BogoMIPS (lpj=1394688)
[ 0.081156] pid_max: default: 32768 minimum: 301
[ 0.086202] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.093257] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.101653] ftrace: allocating 14258 entries in 28 pages
[ 0.143531] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.154049] futex hash table entries: 256 (order: -1, 3072 bytes)
[ 0.161771] NET: Registered protocol family 16
[ 0.168060] MIPS: machine is TP-LINK TL-WDR3600/4300/4310
[ 0.177177] registering PCI controller with io_map_base unset
[ 0.435908] PCI host bridge to bus 0000:00
[ 0.440336] pci_bus 0000:00: root bus resource [mem 0x10000000-0x13ffffff]
[ 0.447653] pci_bus 0000:00: root bus resource [io 0x0000]
[ 0.453596] pci_bus 0000:00: root bus resource [??? 0x00000000 flags 0x0]
[ 0.460816] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[ 0.469304] pci 0000:00:00.0: invalid calibration data
[ 0.475217] pci 0000:00:00.0: BAR 0: assigned [mem 0x10000000-0x1001ffff 64bit]
[ 0.483050] pci 0000:00:00.0: BAR 6: assigned [mem 0x10020000-0x1002ffff pref]
[ 0.490748] pci 0000:00:00.0: using irq 40 for pin 1
[ 0.499024] clocksource: Switched to clocksource MIPS
[ 0.518373] NET: Registered protocol family 2
[ 0.524035] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.531521] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.538295] TCP: Hash tables configured (established 1024 bind 1024)
[ 0.545151] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 0.551412] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 0.558297] NET: Registered protocol family 1
[ 2.589038] random: fast init done
[ 3.533190] Crashlog allocated RAM at address 0x3f00000
[ 3.539923] workingset: timestamp_bits=30 max_order=15 bucket_order=0
[ 3.554591] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 3.560842] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 3.694475] io scheduler noop registered
[ 3.698650] io scheduler deadline registered (default)
[ 3.704604] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[ 3.714318] console [ttyS0] disabled
[ 3.738205] serial8250.0: ttyS0 at MMIO 0x18020000 (irq = 11, base_baud = 2500000) is a 16550A
[ 3.747394] console [ttyS0] enabled
[ 3.747394] console [ttyS0] enabled
[ 3.754816] bootconsole [early0] disabled
[ 3.754816] bootconsole [early0] disabled
[ 3.769275] m25p80 spi0.0: found s25fl064k, expected m25p80
[ 3.785152] m25p80 spi0.0: s25fl064k (8192 Kbytes)
[ 3.790332] 5 tp-link partitions found on MTD device spi0.0
[ 3.795989] Creating 5 MTD partitions on "spi0.0":
[ 3.800884] 0x000000000000-0x000000020000 : "u-boot"
[ 3.807458] 0x000000020000-0x00000016d1cc : "kernel"
[ 3.814288] 0x00000016d1cc-0x0000007f0000 : "rootfs"
[ 3.821104] mtd: device 2 (rootfs) set to be root filesystem
[ 3.826882] 1 squashfs-split partitions found on MTD device rootfs
[ 3.833219] 0x0000003b0000-0x0000007f0000 : "rootfs_data"
[ 3.840474] 0x0000007f0000-0x000000800000 : "art"
[ 3.846991] 0x000000020000-0x0000007f0000 : "firmware"
[ 3.855013] libphy: Fixed MDIO Bus: probed
[ 3.909077] switch0: Atheros AR8327 rev. 2 switch registered on ag71xx-mdio.0
[ 5.072751] libphy: ag71xx_mdio: probed
[ 5.700417] ag71xx ag71xx.0: connected to PHY at ag71xx-mdio.0:00 [uid=004dd033, driver=Atheros AR8216/AR8236/AR8316]
[ 5.711952] eth0: Atheros AG71xx at 0xb9000000, irq 4, mode:RGMII
[ 5.720077] NET: Registered protocol family 10
[ 5.728146] NET: Registered protocol family 17
[ 5.732778] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[ 5.746033] 8021q: 802.1Q VLAN Support v1.8
[ 5.763993] Freeing unused kernel memory: 2568K
[ 5.768597] This architecture does not have kernel memory protection.
[ 5.790338] init: Console is alive
[ 5.794031] init: - watchdog -
[ 5.836273] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[ 5.853856] CPU 0 Unable to handle kernel paging request at virtual address 27bdfff0, epc == 86e906a4, ra == 86e90688
[ 5.864676] Oops[#1]:
[ 5.866989] CPU: 0 PID: 355 Comm: kmodloader Not tainted 4.9.87 #0
[ 5.873258] task: 87e3af88 task.stack: 86e70000
[ 5.877847] $ 0 : 00000000 86e90688 801b629c 801b62a0
[ 5.883179] $ 4 : 801b62b0 00200000 00000000 00000000
[ 5.888512] $ 8 : 87e0f240 fffffffc 732d706f 6c6c6564
[ 5.893846] $12 : 86e71bdc 001c0040 00000000 6f5f746f
[ 5.899178] $16 : 87ce8010 86e90614 27bdffe0 807e0000
[ 5.904510] $20 : 807e0000 00000001 00000015 024000c0
[ 5.909844] $24 : 00000001 00000000
[ 5.915176] $28 : 86e70000 86e71be0 800d58a0 86e90688
[ 5.920509] Hi : 00000007
[ 5.923431] Lo : 00000010
[ 5.926374] epc : 86e906a4 0x86e906a4
[ 5.930269] ra : 86e90688 0x86e90688
[ 5.934158] Status: 1100d403 KERNEL EXL IE
[ 5.938428] Cause : 00800008 (ExcCode 02)
[ 5.942493] BadVA : 27bdfff0
[ 5.945414] PrId : 0001974c (MIPS 74Kc)
[ 5.949390] Modules linked in: gpio_button_hotplug(+) crc16 crypto_hash
[ 5.956130] Process kmodloader (pid: 355, threadinfo=86e70000, task=87e3af88, tls=77087dc0)
[ 5.964597] Stack : 800d58a0 801b8fec 807e0000 800a031c 8051aca0 801b629c 87ce8010 87ce8010
[ 5.973132] 86e91034 86e91034 807e0000 80292054 87c1c4b0 801b8cac 80520000 024000c0
[ 5.981667] 87ce8010 87ce8010 87ce8044 80290328 00000000 00000000 00000015 803fff50
[ 5.990203] 00000000 87ce8010 87ce8044 86e91034 8051aca0 00000000 00000000 8029047c
[ 5.998739] 8051aca0 8028e23c 87dc2180 00000000 00000000 86e91034 802903e8 8028e308
[ 6.007275] ...
[ 6.009768] Call Trace:
[ 6.012259] [<86e906a4>] 0x86e906a4
[ 6.015804] Code: ac430020 24430004 ac430024 <8e430010> 10600004 00008025 0060f809 8c440034 00008025
[ 6.025757]
[ 6.027295] ---[ end trace 11a961593d985b39 ]---
[ 6.033289] Kernel panic - not syncing: Fatal exception
[ 6.039693] Rebooting in 1 seconds..
[unhandled content-type:application/pgp-signature]
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