Re: [ftrace] kernel panics during my attempt to use ftrace

From: Steven Rostedt
Date: Wed Jun 22 2016 - 11:10:40 EST

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In reply to: Enrico Mioso: "[ftrace] kernel panics during my attempt to use ftrace"
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On Tue, 21 Jun 2016 14:53:24 +0200 (CEST)
Enrico Mioso <mrkiko.rs@xxxxxxxxx> wrote:

> Hello guys.
>
> First of all - thank you for your great work in ftrace, and in general in the
> Linux tracing infrastructure. I am a newbie: so I am not able to use it at it's
> full power, still I find it's capabilities impressive.
>
> I am asking for help, since I am encountering some problems in using ftrace.
> I am trying to come up with a solution to trace a specific workload (a
> program): to understand what are the functions the kernel spends most of his
> time in.
> To do so, I inspired myself to some code I found around (I can mention it if
> needed). I took free inspiration: so my editing may be very very wrong.
> When I run this script, the kernel panics. the output is below. the kernel is
> Ubuntu 16.04 stock, running in a qemu virtual machine (using kvm).

I see that It's also a 32bit version. Can you run a 64 bit kernel?

> Any help would be greatly apreciated. Thank you very much guys.
> Fort any needed infos, contact me.
> Enrico
>
> Script:
> #!/bin/sh
> if [ `whoami` != root ]
> then
> echo you need to run this script as root
> exit 1
> fi
>
> tdir=/sys/kernel/debug/tracing
> start()
> {
> # echo 50000 > $tdir/buffer_size_kb
> echo function_graph > $tdir/current_tracer
> echo 1000 >$tdir/tracing_thresh
> echo >$tdir/trace
> echo 1 >$tdir/tracing_on # ** this is wrong, interface changed?
> }
> stop()
> {
> echo >set_event
> echo 0 >$tdir/tracing_on
> output=trace`date +%y-%m-%d-%H-%M-%S`.txt
> echo funcgraph-abstime >$tdir/trace_options
> echo funcgraph-proc >$tdir/trace_options
> cat $tdir/trace > $output
> echo trace written to $output
> }
> COMMAND="$1"
> case $COMMAND in
> start|stop)
> $COMMAND
> ;;
> *)
> echo "usage: $0 [start|stop]"
> ;;
> esac
>

I ran this on bare metal for the latest kernel as well as a stock v4.4
kernel (I don't have an Ubuntu image, I work for Red Hat ;-) (although,
I do have Debian).

>
> Kernel panic output:
> [ 825.336708] BUG: unable to handle kernel paging request at 55501e06
> [ 825.340572] IP: [<c17aa9ca>] ftrace_regs_caller+0xa/0x35
> [ 825.340572] *pdpt = 000000001ef4c001 *pde = 0000000000000000
> [ 825.340572] Oops: 0000 [#1] SMP
> [ 825.340572] Modules linked in: isofs ppdev joydev serio_raw parport_pc parpor
> t ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tc
> p libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov a
> sync_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multi
> path linear psmouse e1000 floppy
> [ 825.340572] CPU: 0 PID: 7 Comm: rcu_sched Not tainted 4.4.0-24-generic #43-Ub
> untu
> [ 825.340572] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.2
> -20160422_131301-anatol 04/01/2014
> [ 825.340572] task: de8f3480 ti: de988000 task.ti: de988000
> [ 825.340572] EIP: 0060:[<c17aa9ca>] EFLAGS: 00010202 CPU: 0
> [ 825.340572] EIP is at ftrace_regs_caller+0xa/0x35
> [ 825.340572] EAX: de989e4e EBX: c10db072 ECX: 00000000 EDX: 00000268
> [ 825.340572] ESI: de8f3480 EDI: dee08800 EBP: de989f10 ESP: de989ec4
> [ 825.340572] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
> [ 825.340572] CR0: 8005003b CR2: 55501e06 CR3: 1e073e20 CR4: 000006e0
> [ 825.340572] Stack:
> [ 825.340572] c113f017 de8f3480 d4d1dc00 de989f0c c17a5b75 de9d4ec0 de989f60 d
> e989f60
> [ 825.340572] c17a60e8 edf05431 00000268 f2ee631c 00000268 00000000 00000000 8
> aced3dc
> [ 825.340572] c1ae0490 00000000 c1ae0300 de989f60 c17aaa46 dffbbdc0 00000000 0
> 0000000
> [ 825.340572] Call Trace:
> [ 825.340572] [<c113f017>] ? ftrace_return_to_handler+0x97/0x170
> [ 825.340572] [<c17a5b75>] ? __schedule+0x305/0x790
> [ 825.340572] [<c17a60e8>] ? yield_to+0x68/0x170
> [ 825.340572] [<c17aaa46>] return_to_handler+0x9/0xf
> [ 825.340572] [<c10afbd0>] ? wake_atomic_t_function+0x70/0x70
> [ 825.340572] [<c10d5800>] ? force_qs_rnp+0x140/0x140
> [ 825.340572] [<c108ce06>] kthread+0xa6/0xc0

Can you run a mainline kernel (build one yourself from the kernel.org
source) and see if it still crashes. If it doesn't you may need to
contact Ubuntu to fix this.

But if not, let me know, and I can walk you through steps to figure out
where the bug is.

-- Steve

> [ 825.340572] [<c17a9949>] ret_from_kernel_thread+0x21/0x38
> [ 825.340572] [<c108cd60>] ? kthread_create_on_node+0x170/0x170
> [ 825.340572] Code: 6a 00 8b 44 24 10 8b 55 04 8b 0d 94 14 b7 c1 83 e8 05 e8 08
> 00 00 00 83 c4 04 5a 59 58 e9 63 00 00 00 ff 74 24 04 6a 00 0f a8 0f <a0> 06 1e
> 50 55 57 56 52 51 53 8b 44 24 34 89 44 24 38 c7 44 24
> [ 825.340572] EIP: [<c17aa9ca>] ftrace_regs_caller+0xa/0x35 SS:ESP 0068:de989ec
> 4
> [ 825.340572] CR2: 0000000055501e06
> [ 825.340572] ---[ end trace 4f291f60e8d43d37 ]---
> [ 825.996200] invalid opcode: 0000 [#2] SMP
> [ 826.000050] Modules linked in: isofs ppdev joydev serio_raw parport_pc parpor
> t ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tc
> p libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov a
> sync_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multi
> path linear psmouse e1000 floppy
> [ 826.000050] CPU: 0 PID: 1044 Comm: iscsid Tainted: G D 4.4.0-24-
> generic #43-Ubuntu
> [ 826.000050] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.2
> -20160422_131301-anatol 04/01/2014
> [ 826.000050] task: d4679180 ti: dee54000 task.ti: dee54000
> [ 826.000050] EIP: 0060:[<c17aa9be>] EFLAGS: 00010217 CPU: 0
> [ 826.000050] EIP is at ftrace_stub+0x0/0x2
> [ 826.000050] EAX: dee55adc EBX: c17a8d92 ECX: 00000000 EDX: 00000269
> [ 826.000050] ESI: d4679180 EDI: de0e9800 EBP: dee55b08 ESP: dee55abc
> [ 826.000050] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
> [ 826.000050] CR0: 8005003b CR2: b7362010 CR3: 1f0d3080 CR4: 000006e0
> [ 826.000050] Stack:
> [ 826.000050] c113f017 d4679180 de29f400 dee55b04 c17a5b75 d4fe2300 dee55b88 d
> ee55b88
> [ 826.000050] c17a6004 edebaa8f 00000268 1a3d53a3 00000269 00000000 00000006 9
> 7ca1d76
> [ 826.000050] dee55b34 0003d083 000000c0 dee55b88 c17aaa46 dffbbdc0 00000000 0
> 003d083
> [ 826.000050] Call Trace:
> [ 826.000050] [<c113f017>] ? ftrace_return_to_handler+0x97/0x170
> [ 826.000050] [<c17a5b75>] ? __schedule+0x305/0x790
> [ 826.000050] [<c17a6004>] ? schedule+0x4/0x80
> [ 826.000050] [<c17aaa46>] return_to_handler+0x9/0xf
> [ 826.000050] [<c10dc330>] ? __hrtimer_init+0x90/0x90
> [ 826.000050] [<c17aaa3d>] ? ftrace_graph_caller+0x19/0x19
> [ 826.000050] [<c17a8eb7>] schedule_hrtimeout_range+0x17/0x20
> [ 826.000050] [<c17aaa3d>] ftrace_graph_caller+0x19/0x19
> [ 826.000050] [<c11efca6>] poll_schedule_timeout+0x36/0x60
> [ 826.000050] [<c17aaa3d>] ftrace_graph_caller+0x19/0x19
> [ 826.000050] [<c11f13d8>] do_sys_poll+0x4c8/0x570
> [ 826.000050] [<c17aaa3d>] ftrace_graph_caller+0x19/0x19
> [ 826.000050] [<c11f154e>] SyS_poll+0x5e/0x100
> [ 826.000050] [<c1179368>] ? __alloc_pages_nodemask+0x128/0xa40
> [ 826.000050] [<c1067736>] ? kmap_atomic_prot+0x36/0x100
> [ 826.000050] [<c11efe00>] ? poll_select_copy_remaining+0x130/0x130
> [ 826.000050] [<c11efe00>] ? poll_select_copy_remaining+0x130/0x130
> [ 826.000050] [<c105bb07>] ? kvm_clock_read+0x17/0x20
> [ 826.000050] [<c105cadb>] ? pvclock_clocksource_read+0xab/0x150
> [ 826.000050] [<c105cadb>] ? pvclock_clocksource_read+0xab/0x150
> [ 826.000050] [<c105bb07>] ? kvm_clock_read+0x17/0x20
> [ 826.000050] [<c105cadb>] ? pvclock_clocksource_read+0xab/0x150
> [ 826.000050] [<c105bb07>] ? kvm_clock_read+0x17/0x20
> [ 826.000050] [<c1032918>] ? sched_clock+0x8/0x10
> [ 826.000050] [<c11267a8>] ? trace_clock_local+0x8/0x10
> [ 826.000050] [<c112de75>] ? rb_reserve_next_event+0x75/0x430
> [ 826.000050] [<c112efc2>] ? ring_buffer_unlock_commit+0x22/0x240
> [ 826.000050] [<c1135760>] ? __buffer_unlock_commit+0x10/0x20
> [ 826.000050] [<c113f409>] ? __trace_graph_return+0x89/0xa0
> [ 826.000050] [<c11f1542>] ? SyS_poll+0x52/0x100
> [ 826.000050] [<c113f017>] ? ftrace_return_to_handler+0x97/0x170
> [ 826.000050] [<c11effb8>] ? poll_select_set_timeout+0x8/0xa0
> [ 826.000050] [<c17aaa3d>] ftrace_graph_caller+0x19/0x19
> [ 826.000050] [<c100393d>] do_fast_syscall_32+0x8d/0x150
> [ 826.000050] [<c17aaa3d>] ftrace_graph_caller+0x19/0x19
> [ 826.000050] [<c17a99dc>] sysenter_past_esp+0x3d/0x61
> [ 826.000050] [<c17aaa3d>] ftrace_graph_caller+0x19/0x19
> [ 826.000050] Code: ff ff 8d 76 00 c3 8d 76 00 50 51 52 6a 00 8b 44 24 10 8b 55
> 04 8b 0d 94 14 b7 c1 83 e8 05 e8 08 00 00 00 83 c4 04 5a 59 58 e9 fd <ff> ff ff
> ff 74 24 04 6a 00 0f a8 0f a0 06 1e 50 55 57 56 52 51
> [ 826.000050] EIP: [<c17aa9be>] ftrace_stub+0x0/0x2 SS:ESP 0068:dee55abc
> [ 826.640678] ---[ end trace 4f291f60e8d43d38 ]---
> [ 826.649117] invalid opcode: 0000 [#3] SMP
> [ 826.652668] Modules linked in: isofs ppdev joydev serio_raw parport_pc parpor
> t ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tc
> p libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov a
> sync_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multi
> path linear psmouse e1000 floppy
> [ 826.652668] CPU: 0 PID: 4 Comm: kworker/0:0 Tainted: G D 4.4.0-2
> 4-generic #43-Ubuntu
> [ 826.652668] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.2
> -20160422_131301-anatol 04/01/2014
> [ 826.652668] task: de8f1a40 ti: de8fe000 task.ti: de8fe000
> [ 826.652668] EIP: 0060:[<c17aa9be>] EFLAGS: 00010246 CPU: 0
> [ 826.652668] EIP is at ftrace_stub+0x0/0x2
> [ 826.652668] EAX: de8fff00 EBX: c10879d2 ECX: 00000000 EDX: 00000269
> [ 826.652668] ESI: de8f1a40 EDI: de167800 EBP: de8fff2c ESP: de8ffee0
> [ 826.652668] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
> [ 826.652668] CR0: 8005003b CR2: 00000068 CR3: 1f0d3080 CR4: 000006e0
> [ 826.652668] Stack:
> [ 826.652668] c113f017 de8f1a40 deb1a600 de8fff28 c17a5b75 d467e040 de8fff60 d
> e8fff60
> [ 826.652668] c17a6004 edd8153d 00000268 41282712 00000269 00000000 00000000 b
> 4d9c50e
> [ 826.652668] dffbb8c0 de821a98 de821a80 de8fff60 c17aaa46 dffbbdc0 00000000 d
> ffbba54
> [ 826.652668] Call Trace:
> [ 826.652668] [<c113f017>] ? ftrace_return_to_handler+0x97/0x170
> [ 826.652668] [<c17a5b75>] ? __schedule+0x305/0x790
> [ 826.652668] [<c17a6004>] ? schedule+0x4/0x80
> [ 826.652668] [<c17aaa46>] return_to_handler+0x9/0xf
> [ 826.652668] [<c1087920>] ? process_one_work+0x3f0/0x3f0
> [ 826.652668] [<c108ce06>] kthread+0xa6/0xc0
> [ 826.652668] [<c17a9949>] ret_from_kernel_thread+0x21/0x38
> [ 826.652668] [<c108cd60>] ? kthread_create_on_node+0x170/0x170
> [ 826.652668] Code: ff ff 8d 76 00 c3 8d 76 00 50 51 52 6a 00 8b 44 24 10 8b 55
> 04 8b 0d 94 14 b7 c1 83 e8 05 e8 08 00 00 00 83 c4 04 5a 59 58 e9 fd <ff> ff ff
> ff 74 24 04 6a 00 0f a8 0f a0 06 1e 50 55 57 56 52 51
> [ 826.652668] EIP: [<c17aa9be>] ftrace_stub+0x0/0x2 SS:ESP 0068:de8ffee0
> [ 827.033592] ---[ end trace 4f291f60e8d43d39 ]---
> [ 827.041794] invalid opcode: 0000 [#4] SMP
> [ 827.045579] Modules linked in: isofs ppdev joydev serio_raw parport_pc parpor
> t ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tc
> p libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov a
> sync_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multi
> path linear psmouse e1000 floppy
> [ 827.045579] CPU: 0 PID: 76 Comm: kworker/u2:3 Tainted: G D 4.4.0
> -24-generic #43-Ubuntu
> [ 827.045579] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.2
> -20160422_131301-anatol 04/01/2014
> [ 827.045579] task: d4fe2300 ti: d4ff0000 task.ti: d4ff0000
> [ 827.045579] EIP: 0060:[<c17aa9be>] EFLAGS: 00010246 CPU: 0
> [ 827.045579] EIP is at ftrace_stub+0x0/0x2
> [ 827.045579] EAX: d4ff1f00 EBX: c10879d2 ECX: 00000000 EDX: 00000269
> [ 827.045579] ESI: d4fe2300 EDI: de04a000 EBP: d4ff1f2c ESP: d4ff1ee0
> [ 827.045579] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
> [ 827.045579] CR0: 8005003b CR2: 00000068 CR3: 1f0d3080 CR4: 000006e0
> [ 827.045579] Stack:
> [ 827.045579] c113f017 d4fe2300 deb1a600 d4ff1f28 c17a5b75 de8f3480 d4ff1f60 d
> 4ff1f60
> [ 827.045579] c17a6004 edee6883 00000268 588ffd18 00000269 00000000 00000000 9
> f590057
> [ 827.045579] de8a5c00 d4f91b58 d4f91b40 d4ff1f60 c17aaa46 dffbbdc0 00000000 d
> e8a5d94
> [ 827.045579] Call Trace:
> [ 827.045579] [<c113f017>] ? ftrace_return_to_handler+0x97/0x170
> [ 827.045579] [<c17a5b75>] ? __schedule+0x305/0x790
> [ 827.045579] [<c17a6004>] ? schedule+0x4/0x80
> [ 827.045579] [<c17aaa46>] return_to_handler+0x9/0xf
> [ 827.045579] [<c1087920>] ? process_one_work+0x3f0/0x3f0
> [ 827.045579] [<c108ce06>] kthread+0xa6/0xc0
> [ 827.045579] [<c17a9949>] ret_from_kernel_thread+0x21/0x38
> [ 827.045579] [<c108cd60>] ? kthread_create_on_node+0x170/0x170
> [ 827.045579] Code: ff ff 8d 76 00 c3 8d 76 00 50 51 52 6a 00 8b 44 24 10 8b 55
> 04 8b 0d 94 14 b7 c1 83 e8 05 e8 08 00 00 00 83 c4 04 5a 59 58 e9 fd <ff> ff ff
> ff 74 24 04 6a 00 0f a8 0f a0 06 1e 50 55 57 56 52 51
> [ 827.045579] EIP: [<c17aa9be>] ftrace_stub+0x0/0x2 SS:ESP 0068:d4ff1ee0
> [ 827.426561] ---[ end trace 4f291f60e8d43d3a ]---
> [ 827.856521] BUG: unable to handle kernel paging request at ffffffec
> [ 827.860060] IP: [<c108d3bf>] kthread_data+0xf/0x20
> [ 827.860060] *pdpt = 0000000001c6b001 *pde = 0000000001c6c063 *pte = 000000000
> 0000000
> [ 827.860060] Oops: 0000 [#5] SMP
> [ 827.860060] Modules linked in: isofs ppdev joydev serio_raw parport_pc parpor
> t ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tc
> p libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov a
> sync_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multi
> path linear psmouse e1000 floppy
> [ 827.860060] CPU: 0 PID: 76 Comm: kworker/u2:3 Tainted: G D 4.4.0
> -24-generic #43-Ubuntu
> [ 827.860060] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.2
> -20160422_131301-anatol 04/01/2014
> [ 827.860060] task: d4fe2300 ti: d4ff0000 task.ti: d4ff0000
> [ 827.860060] EIP: 0060:[<c108d3bf>] EFLAGS: 00010086 CPU: 0
> [ 827.860060] EIP is at kthread_data+0xf/0x20
> [ 827.860060] EAX: 00000000 EBX: 00000000 ECX: c17a5944 EDX: 00000000
> [ 827.860060] ESI: c1c62dc0 EDI: dffbbdc0 EBP: d4ff1d08 ESP: d4ff1d00
> [ 827.860060] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
> [ 827.860060] CR0: 8005003b CR2: 00000014 CR3: 1ee9a040 CR4: 000006e0
> [ 827.860060] Stack:
> [ 827.860060] c17aaa3d d4fe2300 d4ff1d44 c17aaa3d c10546d2 d4ff1d9c d4ff1d9c c
> 17a6004
> [ 827.860060] 00000000 9f590057 00000000 d4ff1d84 dffbbdc0 d4fe2300 d4ff2000 d
> 4ff1d84
> [ 827.860060] d4fe2300 d4ff1d50 c17a602d d4ff1a4c d4ff1d9c c17aaa3d d4ff1d78 c
> 10c7ca1
> [ 827.860060] Call Trace:
> [ 827.860060] [<c17aaa3d>] ? ftrace_graph_caller+0x19/0x19
> [ 827.860060] [<c102cea6>] print_context_stack+0xc6/0xd0
> [ 827.860060] [<c17aaa3d>] ftrace_graph_caller+0x19/0x19
> [ 827.860060] [<c102c445>] dump_trace+0xc5/0x1e0
> [ 827.860060] [<c10546d2>] ? prepare_ftrace_return+0x92/0xc0
> [ 827.860060] [<c17a6004>] ? schedule+0x4/0x80
> [ 827.860060] [<c17a602d>] schedule+0x2d/0x80
> [ 827.860060] [<c17aaa3d>] ftrace_graph_caller+0x19/0x19
> [ 827.860060] [<c102cfe6>] show_trace_log_lvl+0x46/0x50
> [ 827.860060] [<c10c7ca1>] ? vprintk_default+0x41/0x60
> [ 827.860060] [<c116fb07>] ? printk+0x17/0x19
> [ 827.860060] [<c102cc42>] oops_end+0x92/0xd0
> [ 827.860060] [<c102d10e>] die+0x4e/0x70
> [ 827.860060] [<c102a269>] do_trap+0x99/0xc0
> [ 827.860060] [<c102a58a>] do_error_trap+0x8a/0x120
> [ 827.860060] [<c17aa9be>] ? ftrace_graph_call+0x2/0x2
> [ 827.860060] [<c112efc2>] ? ring_buffer_unlock_commit+0x22/0x240
> [ 827.860060] [<c1135760>] ? __buffer_unlock_commit+0x10/0x20
> [ 827.860060] [<c113f409>] ? __trace_graph_return+0x89/0xa0
> [ 827.860060] [<c10879d2>] ? worker_thread+0xb2/0x490
> [ 827.860060] [<c102abb0>] ? do_overflow+0x30/0x30
> [ 827.860060] [<c102abd4>] do_invalid_op+0x24/0x30
> [ 827.860060] [<c17aaac7>] error_code+0x67/0x6c
> [ 827.860060] [<c10879d2>] ? worker_thread+0xb2/0x490
> [ 827.860060] [<c10500d8>] ? assign_irq_vector+0x228/0x2c0
> [ 827.860060] [<c17aa9be>] ? ftrace_graph_call+0x2/0x2
> [ 827.860060] [<c113f017>] ? ftrace_return_to_handler+0x97/0x170
> [ 827.860060] [<c17a5b75>] ? __schedule+0x305/0x790
> [ 827.860060] [<c17a6004>] ? schedule+0x4/0x80
> [ 827.860060] [<c17aaa46>] return_to_handler+0x9/0xf
> [ 827.860060] [<c1087920>] ? process_one_work+0x3f0/0x3f0
> [ 827.860060] [<c108ce06>] kthread+0xa6/0xc0
> [ 827.860060] [<c17a9949>] ret_from_kernel_thread+0x21/0x38
> [ 827.860060] [<c108cd60>] ? kthread_create_on_node+0x170/0x170
> [ 827.860060] Code: 00 00 00 00 ba 46 02 00 00 b8 04 6c 9b c1 e8 19 30 fe ff e9
> df fe ff ff 8d 74 26 00 55 89 e5 e8 6c d6 71 00 8b 80 74 03 00 00 5d <8b> 40 ec
> c3 8d b6 00 00 00 00 8d bc 27 00 00 00 00 55 89 e5 83
> [ 827.860060] EIP: [<c108d3bf>] kthread_data+0xf/0x20 SS:ESP 0068:d4ff1d00
> [ 827.860060] CR2: 00000000ffffffec
> [ 827.860060] ---[ end trace 4f291f60e8d43d3b ]---
> [ 827.860060] Fixing recursive fault but reboot is needed!

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