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| Started by | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| First post | 2017-09-12 03:20 +0200 |
| Last post | 2017-09-15 02:20 +0200 |
| Articles | 4 — 2 participants |
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[PATCH -tip v2] kprobes: Use synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT Masami Hiramatsu <mhiramat@kernel.org> - 2017-09-12 03:20 +0200
Re: [PATCH -tip v2] kprobes: Use synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-12 07:30 +0200
Re: [lkp-robot] [kprobes] e1ce3eee7d: BUG:using_smp_processor_id()in_preemptible Masami Hiramatsu <mhiramat@kernel.org> - 2017-09-14 12:30 +0200
Re: [lkp-robot] [kprobes] e1ce3eee7d: BUG:using_smp_processor_id()in_preemptible Masami Hiramatsu <mhiramat@kernel.org> - 2017-09-15 02:20 +0200
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2017-09-12 03:20 +0200 |
| Subject | [PATCH -tip v2] kprobes: Use synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT |
| Message-ID | <uoI1P-2P9-3@gated-at.bofh.it> |
To enable jump optimized probe with CONFIG_PREEMPT, use synchronize_rcu_tasks() to wait for all tasks preempted on trampoline code back on track. Since the jump optimized kprobes can replace multiple instructions, there can be tasks which are interrupted on the 2nd (or 3rd) instructions. If the kprobe replaces those instructions by a jump instruction, when those tasks back to the interrupted place, it is a middle of the jump instruction and causes a kernel panic. To avoid such tragedies in advance, kprobe optimizer prepare a detour route using normal kprobe (e.g. int3 breakpoint on x86), and wait for the tasks which is interrrupted on such place by synchronize_sched() when CONFIG_PREEMPT=n. If CONFIG_PREEMPT=y, things be more complicated, because such interrupted thread can be preempted (other thread can be scheduled in interrupt handler.) So, kprobes optimizer has to wait for those tasks scheduled normally. In this case we can use synchronize_rcu_tasks() which ensures that all preempted tasks back on track and schedule it. Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> --- arch/Kconfig | 2 +- kernel/kprobes.c | 18 +++++++++++++----- 2 files changed, 14 insertions(+), 6 deletions(-) diff --git a/arch/Kconfig b/arch/Kconfig index 2520ca5b42eb..d495c06ae961 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -90,7 +90,7 @@ config STATIC_KEYS_SELFTEST config OPTPROBES def_bool y depends on KPROBES && HAVE_OPTPROBES - depends on !PREEMPT + select TASKS_RCU if PREEMPT config KPROBES_ON_FTRACE def_bool y diff --git a/kernel/kprobes.c b/kernel/kprobes.c index a1606a4224e1..6243b8b02511 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -574,12 +574,20 @@ static void kprobe_optimizer(struct work_struct *work) /* * Step 2: Wait for quiesence period to ensure all running interrupts - * are done. Because optprobe may modify multiple instructions - * there is a chance that Nth instruction is interrupted. In that - * case, running interrupt can return to 2nd-Nth byte of jump - * instruction. This wait is for avoiding it. + * are done. Because optprobe may modify multiple instructions, + * there is a chance that the Nth instruction is interrupted. In that + * case, running interrupt can return to the Nth byte of jump + * instruction. This can be avoided by waiting for returning of + * such interrupts, since (until here) the first byte of the optimized + * probe is already replaced with normal kprobe (sw breakpoint) and + * all threads which reach to the probed address will hit it and + * bypass the copied instructions instead of executing the original. + * With CONFIG_PREEMPT, such interrupts can be preepmted. To wait + * for such thread, we will use synchronize_rcu_tasks() which ensures + * all preeempted tasks are scheduled normally (= not preempted.) + * So we can ensure there is no threads preempted at probed address. */ - synchronize_sched(); + synchronize_rcu_tasks(); /* Step 3: Optimize kprobes after quiesence period */ do_optimize_kprobes();
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| From | "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> |
|---|---|
| Date | 2017-09-12 07:30 +0200 |
| Subject | Re: [PATCH -tip v2] kprobes: Use synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT |
| Message-ID | <uoLVL-5vV-3@gated-at.bofh.it> |
| In reply to | #1730599 |
On Tue, Sep 12, 2017 at 10:10:51AM +0900, Masami Hiramatsu wrote: > To enable jump optimized probe with CONFIG_PREEMPT, use > synchronize_rcu_tasks() to wait for all tasks preempted > on trampoline code back on track. > > Since the jump optimized kprobes can replace multiple > instructions, there can be tasks which are interrupted > on the 2nd (or 3rd) instructions. If the kprobe > replaces those instructions by a jump instruction, > when those tasks back to the interrupted place, it is > a middle of the jump instruction and causes a kernel > panic. > To avoid such tragedies in advance, kprobe optimizer > prepare a detour route using normal kprobe (e.g. > int3 breakpoint on x86), and wait for the tasks which > is interrrupted on such place by synchronize_sched() > when CONFIG_PREEMPT=n. > If CONFIG_PREEMPT=y, things be more complicated, because > such interrupted thread can be preempted (other thread > can be scheduled in interrupt handler.) So, kprobes > optimizer has to wait for those tasks scheduled normally. > In this case we can use synchronize_rcu_tasks() which > ensures that all preempted tasks back on track and > schedule it. > > Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> > --- > arch/Kconfig | 2 +- > kernel/kprobes.c | 18 +++++++++++++----- > 2 files changed, 14 insertions(+), 6 deletions(-) > > diff --git a/arch/Kconfig b/arch/Kconfig > index 2520ca5b42eb..d495c06ae961 100644 > --- a/arch/Kconfig > +++ b/arch/Kconfig > @@ -90,7 +90,7 @@ config STATIC_KEYS_SELFTEST > config OPTPROBES > def_bool y > depends on KPROBES && HAVE_OPTPROBES > - depends on !PREEMPT > + select TASKS_RCU if PREEMPT > > config KPROBES_ON_FTRACE > def_bool y > diff --git a/kernel/kprobes.c b/kernel/kprobes.c > index a1606a4224e1..6243b8b02511 100644 > --- a/kernel/kprobes.c > +++ b/kernel/kprobes.c > @@ -574,12 +574,20 @@ static void kprobe_optimizer(struct work_struct *work) > > /* > * Step 2: Wait for quiesence period to ensure all running interrupts > - * are done. Because optprobe may modify multiple instructions > - * there is a chance that Nth instruction is interrupted. In that > - * case, running interrupt can return to 2nd-Nth byte of jump > - * instruction. This wait is for avoiding it. > + * are done. Because optprobe may modify multiple instructions, > + * there is a chance that the Nth instruction is interrupted. In that > + * case, running interrupt can return to the Nth byte of jump > + * instruction. This can be avoided by waiting for returning of > + * such interrupts, since (until here) the first byte of the optimized > + * probe is already replaced with normal kprobe (sw breakpoint) and > + * all threads which reach to the probed address will hit it and > + * bypass the copied instructions instead of executing the original. > + * With CONFIG_PREEMPT, such interrupts can be preepmted. To wait > + * for such thread, we will use synchronize_rcu_tasks() which ensures > + * all preeempted tasks are scheduled normally (= not preempted.) > + * So we can ensure there is no threads preempted at probed address. > */ > - synchronize_sched(); > + synchronize_rcu_tasks(); > > /* Step 3: Optimize kprobes after quiesence period */ > do_optimize_kprobes(); >
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| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2017-09-14 12:30 +0200 |
| Subject | Re: [lkp-robot] [kprobes] e1ce3eee7d: BUG:using_smp_processor_id()in_preemptible |
| Message-ID | <upzzd-3KU-49@gated-at.bofh.it> |
| In reply to | #1730599 |
On Thu, 14 Sep 2017 12:28:32 +0800
kernel test robot <xiaolong.ye@intel.com> wrote:
>
> FYI, we noticed the following commit:
>
> commit: e1ce3eee7dcda03f2b2f2d64e2cb2f3a993a3b34 ("kprobes: Use synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT")
> url: https://github.com/0day-ci/linux/commits/Masami-Hiramatsu/kprobes-Use-synchronize_rcu_tasks-for-optprobe-with-CONFIG_PREEMPT/20170913-034557
Oops, similar issue was reported by Naveen yesterday, I must handle it.
Thank you,
>
>
> in testcase: boot
>
> on test machine: qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -smp 2 -m 512M
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
> +--------------------------------------------+------------+------------+
> | | 80cee03bf1 | e1ce3eee7d |
> +--------------------------------------------+------------+------------+
> | boot_successes | 28 | 5 |
> | boot_failures | 0 | 23 |
> | BUG:using_smp_processor_id()in_preemptible | 0 | 23 |
> +--------------------------------------------+------------+------------+
>
>
>
> [ 14.675660] BUG: using smp_processor_id() in preemptible [00000000] code: swapper/0/1
> [ 14.700932] caller is debug_smp_processor_id+0x17/0x20
> [ 14.725623] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.13.0-06467-ge1ce3ee #2
> [ 14.729560] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
> [ 14.772244] Call Trace:
> [ 14.772244] dump_stack+0x65/0x87
> [ 14.772244] check_preemption_disabled+0xda/0xe0
> [ 14.772244] debug_smp_processor_id+0x17/0x20
> [ 14.772244] optimized_callback+0x1f/0xf0
> [ 14.772244] 0xffffffffa0002370
> [ 14.772244] ? init_test_probes+0x2cf/0x530
> [ 14.772244] init_kprobes+0x1e6/0x1f1
> [ 14.772244] ? debugfs_kprobe_init+0xa5/0xa5
> [ 14.772244] do_one_initcall+0x4e/0x190
> [ 14.772244] kernel_init_freeable+0x113/0x194
> [ 14.772244] ? rest_init+0x130/0x130
> [ 14.772244] kernel_init+0x9/0xf2
> [ 14.772244] ret_from_fork+0x25/0x30
> [ 16.007679] Kprobe smoke test: passed successfully
> [ 16.025466] Initialise system trusted keyrings
> [ 16.062596] workingset: timestamp_bits=46 max_order=17 bucket_order=0
> [ 16.151965] efs: 1.0a - http://aeschi.ch.eu.org/efs/
> [ 16.164959] fuse init (API version 7.26)
> [ 16.183177] orangefs_debugfs_init: called with debug mask: :none: :0:
> [ 16.196644] orangefs_init: module version upstream loaded
> [ 16.209245] NILFS version 2 loaded
> [ 16.226230] gfs2: GFS2 installed
> [ 16.326266] NET: Registered protocol family 38
> [ 16.344018] Key type asymmetric registered
> [ 16.353442] Asymmetric key parser 'x509' registered
> [ 16.364981] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 249)
> [ 16.382476] io scheduler noop registered
> [ 16.392812] io scheduler cfq registered (default)
> [ 16.405978] test_printf: all 260 tests passed
> [ 16.432644] crc32: CRC_LE_BITS = 64, CRC_BE BITS = 64
> [ 16.443171] crc32: self tests passed, processed 225944 bytes in 2307458 nsec
> [ 16.456977] crc32c: CRC_LE_BITS = 64
> [ 16.464432] crc32c: self tests passed, processed 225944 bytes in 620214 nsec
> [ 16.636881] crc32_combine: 8373 self tests passed
> [ 16.770158] crc32c_combine: 8373 self tests passed
> [ 16.784290] switchtec: loaded.
> [ 16.791607] rivafb_setup START
> [ 16.801335] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
> [ 16.817701] ACPI: Power Button [PWRF]
> [ 16.848025] HDLC line discipline maxframe=4096
> [ 16.859952] N_HDLC line discipline registered.
> [ 16.874756] r3964: Philips r3964 Driver $Revision: 1.10 $
> [ 16.886652] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
> [ 16.983539] 00:05: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
> [ 17.114800] 00:06: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A
> [ 17.138674] MOXA Intellio family driver version 6.0k
> [ 17.151640] SyncLink serial driver $Revision: 4.38 $
> [ 17.232501] SyncLink serial driver $Revision: 4.38 $, tty major#244
> [ 17.248116] Non-volatile memory driver v1.3
> [ 17.258912] telclk_interrupt = 0xf non-mcpbl0010 hw.
> [ 17.304320] Floppy drive(s): fd0 is 2.88M AMI BIOS
> [ 17.309997] loop: module loaded
> [ 17.344349] null: module loaded
> [ 17.352804] dummy-irq: no IRQ given. Use irq=N
> [ 17.365157] Silicon Labs C2 port support v. 0.51.0 - (C) 2007 Rodolfo Giometti
> [ 17.381691] FDC 0 is a S82078B
> [ 17.395387] c2port c2port0: C2 port uc added
> [ 17.405402] c2port c2port0: uc flash has 30 blocks x 512 bytes (15360 bytes total)
> [ 17.425464] Uniform Multi-Platform E-IDE driver
> [ 17.437073] Loading iSCSI transport class v2.0-870.
> [ 17.455730] aic94xx: Adaptec aic94xx SAS/SATA driver version 1.0.3 loaded
> [ 17.478968] iscsi: registered transport (qla4xxx)
> [ 17.492261] QLogic iSCSI HBA Driver
> [ 17.502789] mpt3sas version 15.100.00.00 loaded
> [ 17.516825] VMware PVSCSI driver - version 1.0.7.0-k
> [ 17.568251] scsi host0: scsi_debug: version 1.86 [20160430]
> [ 17.568251] dev_size_mb=8, opts=0x0, submit_queues=1, statistics=0
> [ 17.599319] scsi 0:0:0:0: Direct-Access Linux scsi_debug 0186 PQ: 0 ANSI: 7
> [ 17.622753] scsi 0:0:0:0: Attached scsi generic sg0 type 0
> [ 17.652924] platform physmap-flash.0: failed to claim resource 0: [mem 0x08000000-0x07ffffff]
> [ 17.672329] slram: not enough parameters.
> [ 17.687505] ftl_cs: FTL header not found.
> [ 17.717310] vcan: Virtual CAN interface driver
> [ 17.737307] slcan: serial line CAN interface driver
> [ 17.753216] slcan: 10 dynamic interface channels.
> [ 17.766066] CAN device driver interface
> [ 17.781333] cc770: CAN netdevice driver
> [ 17.793582] cc770_isa: insufficient parameters supplied
> [ 17.811761] ena: Elastic Network Adapter (ENA) v1.2.0k
> [ 17.838306] Intel(R) Ethernet Switch Host Interface Driver - version 0.21.7-k
> [ 17.860645] Copyright(c) 2013 - 2017 Intel Corporation.
> [ 17.883557] ns83820.c: National Semiconductor DP83820 10/100/1000 driver.
> [ 17.902174] nfp: NFP PCIe Driver, Copyright (C) 2014-2017 Netronome Systems
> [ 17.923819] PPP generic driver version 2.4.2
> [ 17.938243] PPP Deflate Compression module registered
> [ 17.955252] PPP MPPE Compression module registered
> [ 17.971135] Fusion MPT base driver 3.04.20
> [ 17.983899] Copyright (c) 1999-2008 LSI Corporation
> [ 17.999048] Fusion MPT SPI Host driver 3.04.20
> [ 18.023653] Fusion MPT SAS Host driver 3.04.20
> [ 18.052566] Fusion MPT misc device (ioctl) driver 3.04.20
> [ 18.083344] mptctl: Registered with Fusion MPT base driver
> [ 18.098123] mptctl: /dev/mptctl @ (major,minor=10,220)
> [ 18.124512] aoe: AoE v85 initialised.
> [ 18.137382] i8042: PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12
> [ 18.170754] serio: i8042 KBD port at 0x60,0x64 irq 1
>
>
> To reproduce:
>
> git clone https://github.com/intel/lkp-tests.git
> cd lkp-tests
> bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email
>
>
>
> Thanks,
> Xiaolong
--
Masami Hiramatsu <mhiramat@kernel.org>
[toc] | [prev] | [next] | [standalone]
| From | Masami Hiramatsu <mhiramat@kernel.org> |
|---|---|
| Date | 2017-09-15 02:20 +0200 |
| Subject | Re: [lkp-robot] [kprobes] e1ce3eee7d: BUG:using_smp_processor_id()in_preemptible |
| Message-ID | <upMwp-3AN-1@gated-at.bofh.it> |
| In reply to | #1730599 |
On Thu, 14 Sep 2017 12:28:32 +0800
kernel test robot <xiaolong.ye@intel.com> wrote:
>
> FYI, we noticed the following commit:
>
> commit: e1ce3eee7dcda03f2b2f2d64e2cb2f3a993a3b34 ("kprobes: Use synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT")
> url: https://github.com/0day-ci/linux/commits/Masami-Hiramatsu/kprobes-Use-synchronize_rcu_tasks-for-optprobe-with-CONFIG_PREEMPT/20170913-034557
>
>
> in testcase: boot
>
> on test machine: qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -smp 2 -m 512M
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
Hmm, I still couldn't reproduce this bug in my environment...
I found suspicious code, but it doesn't cause below BUG yet.
I've made a kernel with given config (but change all =m to =n, since kbuild builds modules even if I specify bzImage as the target, possibly a kbuild bug?)
BTW, above test command seems not enough, since there is no kernel and kernel parameters specified.
Thank you,
>
>
> +--------------------------------------------+------------+------------+
> | | 80cee03bf1 | e1ce3eee7d |
> +--------------------------------------------+------------+------------+
> | boot_successes | 28 | 5 |
> | boot_failures | 0 | 23 |
> | BUG:using_smp_processor_id()in_preemptible | 0 | 23 |
> +--------------------------------------------+------------+------------+
>
>
>
> [ 14.675660] BUG: using smp_processor_id() in preemptible [00000000] code: swapper/0/1
> [ 14.700932] caller is debug_smp_processor_id+0x17/0x20
> [ 14.725623] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.13.0-06467-ge1ce3ee #2
> [ 14.729560] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
> [ 14.772244] Call Trace:
> [ 14.772244] dump_stack+0x65/0x87
> [ 14.772244] check_preemption_disabled+0xda/0xe0
> [ 14.772244] debug_smp_processor_id+0x17/0x20
> [ 14.772244] optimized_callback+0x1f/0xf0
> [ 14.772244] 0xffffffffa0002370
> [ 14.772244] ? init_test_probes+0x2cf/0x530
> [ 14.772244] init_kprobes+0x1e6/0x1f1
> [ 14.772244] ? debugfs_kprobe_init+0xa5/0xa5
> [ 14.772244] do_one_initcall+0x4e/0x190
> [ 14.772244] kernel_init_freeable+0x113/0x194
> [ 14.772244] ? rest_init+0x130/0x130
> [ 14.772244] kernel_init+0x9/0xf2
> [ 14.772244] ret_from_fork+0x25/0x30
> [ 16.007679] Kprobe smoke test: passed successfully
> [ 16.025466] Initialise system trusted keyrings
> [ 16.062596] workingset: timestamp_bits=46 max_order=17 bucket_order=0
> [ 16.151965] efs: 1.0a - http://aeschi.ch.eu.org/efs/
> [ 16.164959] fuse init (API version 7.26)
> [ 16.183177] orangefs_debugfs_init: called with debug mask: :none: :0:
> [ 16.196644] orangefs_init: module version upstream loaded
> [ 16.209245] NILFS version 2 loaded
> [ 16.226230] gfs2: GFS2 installed
> [ 16.326266] NET: Registered protocol family 38
> [ 16.344018] Key type asymmetric registered
> [ 16.353442] Asymmetric key parser 'x509' registered
> [ 16.364981] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 249)
> [ 16.382476] io scheduler noop registered
> [ 16.392812] io scheduler cfq registered (default)
> [ 16.405978] test_printf: all 260 tests passed
> [ 16.432644] crc32: CRC_LE_BITS = 64, CRC_BE BITS = 64
> [ 16.443171] crc32: self tests passed, processed 225944 bytes in 2307458 nsec
> [ 16.456977] crc32c: CRC_LE_BITS = 64
> [ 16.464432] crc32c: self tests passed, processed 225944 bytes in 620214 nsec
> [ 16.636881] crc32_combine: 8373 self tests passed
> [ 16.770158] crc32c_combine: 8373 self tests passed
> [ 16.784290] switchtec: loaded.
> [ 16.791607] rivafb_setup START
> [ 16.801335] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
> [ 16.817701] ACPI: Power Button [PWRF]
> [ 16.848025] HDLC line discipline maxframe=4096
> [ 16.859952] N_HDLC line discipline registered.
> [ 16.874756] r3964: Philips r3964 Driver $Revision: 1.10 $
> [ 16.886652] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
> [ 16.983539] 00:05: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
> [ 17.114800] 00:06: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A
> [ 17.138674] MOXA Intellio family driver version 6.0k
> [ 17.151640] SyncLink serial driver $Revision: 4.38 $
> [ 17.232501] SyncLink serial driver $Revision: 4.38 $, tty major#244
> [ 17.248116] Non-volatile memory driver v1.3
> [ 17.258912] telclk_interrupt = 0xf non-mcpbl0010 hw.
> [ 17.304320] Floppy drive(s): fd0 is 2.88M AMI BIOS
> [ 17.309997] loop: module loaded
> [ 17.344349] null: module loaded
> [ 17.352804] dummy-irq: no IRQ given. Use irq=N
> [ 17.365157] Silicon Labs C2 port support v. 0.51.0 - (C) 2007 Rodolfo Giometti
> [ 17.381691] FDC 0 is a S82078B
> [ 17.395387] c2port c2port0: C2 port uc added
> [ 17.405402] c2port c2port0: uc flash has 30 blocks x 512 bytes (15360 bytes total)
> [ 17.425464] Uniform Multi-Platform E-IDE driver
> [ 17.437073] Loading iSCSI transport class v2.0-870.
> [ 17.455730] aic94xx: Adaptec aic94xx SAS/SATA driver version 1.0.3 loaded
> [ 17.478968] iscsi: registered transport (qla4xxx)
> [ 17.492261] QLogic iSCSI HBA Driver
> [ 17.502789] mpt3sas version 15.100.00.00 loaded
> [ 17.516825] VMware PVSCSI driver - version 1.0.7.0-k
> [ 17.568251] scsi host0: scsi_debug: version 1.86 [20160430]
> [ 17.568251] dev_size_mb=8, opts=0x0, submit_queues=1, statistics=0
> [ 17.599319] scsi 0:0:0:0: Direct-Access Linux scsi_debug 0186 PQ: 0 ANSI: 7
> [ 17.622753] scsi 0:0:0:0: Attached scsi generic sg0 type 0
> [ 17.652924] platform physmap-flash.0: failed to claim resource 0: [mem 0x08000000-0x07ffffff]
> [ 17.672329] slram: not enough parameters.
> [ 17.687505] ftl_cs: FTL header not found.
> [ 17.717310] vcan: Virtual CAN interface driver
> [ 17.737307] slcan: serial line CAN interface driver
> [ 17.753216] slcan: 10 dynamic interface channels.
> [ 17.766066] CAN device driver interface
> [ 17.781333] cc770: CAN netdevice driver
> [ 17.793582] cc770_isa: insufficient parameters supplied
> [ 17.811761] ena: Elastic Network Adapter (ENA) v1.2.0k
> [ 17.838306] Intel(R) Ethernet Switch Host Interface Driver - version 0.21.7-k
> [ 17.860645] Copyright(c) 2013 - 2017 Intel Corporation.
> [ 17.883557] ns83820.c: National Semiconductor DP83820 10/100/1000 driver.
> [ 17.902174] nfp: NFP PCIe Driver, Copyright (C) 2014-2017 Netronome Systems
> [ 17.923819] PPP generic driver version 2.4.2
> [ 17.938243] PPP Deflate Compression module registered
> [ 17.955252] PPP MPPE Compression module registered
> [ 17.971135] Fusion MPT base driver 3.04.20
> [ 17.983899] Copyright (c) 1999-2008 LSI Corporation
> [ 17.999048] Fusion MPT SPI Host driver 3.04.20
> [ 18.023653] Fusion MPT SAS Host driver 3.04.20
> [ 18.052566] Fusion MPT misc device (ioctl) driver 3.04.20
> [ 18.083344] mptctl: Registered with Fusion MPT base driver
> [ 18.098123] mptctl: /dev/mptctl @ (major,minor=10,220)
> [ 18.124512] aoe: AoE v85 initialised.
> [ 18.137382] i8042: PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12
> [ 18.170754] serio: i8042 KBD port at 0x60,0x64 irq 1
>
>
> To reproduce:
>
> git clone https://github.com/intel/lkp-tests.git
> cd lkp-tests
> bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email
>
>
>
> Thanks,
> Xiaolong
--
Masami Hiramatsu <mhiramat@kernel.org>
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