When debugging a race condition in scsi_remove_target of 3.12, I ran into this
possible bug within scsi_alloc_target.
When an existing "struct scsi_target" is found and used, the starget just got
through kzmalloc should be freed, rather than dong a "put_device(dev)".
diff --git a/drivers/scsi/sc
I've collected four crash dumps with similar backtrace.
PID: 247TASK: 881fcfad8000 CPU: 14 COMMAND: "kswapd1"
#0 [881fcfad7978] machine_kexec at 81051e9b
#1 [881fcfad79d8] crash_kexec at 810f27e2
#2 [881fcfad7aa8] oops_end at 8163f448
#3 [881f
ff811a
0x811a340a <+250>: lea0x1(%rcx),%edx
0x811a340d <+253>: mov%ecx,%eax
0x811a340f <+255>: lock cmpxchg %edx,(%rsi)
0x811a3413 <+259>: cmp%eax,%ecx
0x811a3415 <+261>: je 0x811
}
}
}
},
wait_list = {
next = 0x0,
prev = 0x0
}
},
refcount = {
counter = 0
},
rb_root = {
rb_node = 0x0
}
}
crash>
-Original Message-
From: linux-kernel-ow...@vger.kernel.org
[mailto:linux-kernel-ow...@vger.kernel.org] On Behalf Of Dashi DS1 Cao
Sent: Thurs
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -1614,16 +1614,13 @@ megasas_queue_command(struct Scsi_Host *shost, struct
scsi_cmnd *scmd)
goto out_done;
}
- switch (scmd->cmnd[0]) {
- case SYNCHRONIZE_CACHE:
uded: kernel virtual address: 882b47ddadc0"
I guess it is not copied out because it has already been put into some unused
list.
Dashi Cao
-Original Message-
From: Hugh Dickins [mailto:hu...@google.com]
Sent: Friday, December 23, 2016 6:27 AM
To: Peter Zijlstra
Cc: Michal Hocko
f881fcfad3ec8] kthread at 810a5b8f
#14 [881fcfad3f50] ret_from_fork at 81646a98
I hope the information would be useful.
Dashi Cao
-Original Message-
From: Hugh Dickins [mailto:hu...@google.com]
Sent: Friday, December 23, 2016 6:27 AM
To: Peter Zijlstra
Cc: Michal Hocko
2016 10:20 PM
To: Dashi DS1 Cao
Cc: Hugh Dickins ; Michal Hocko ;
linux...@kvack.org; linux-kernel@vger.kernel.org
Subject: Re: A small window for a race condition in
mm/rmap.c:page_lock_anon_vma_read
On Fri, Dec 23, 2016 at 02:02:14AM +0000, Dashi DS1 Cao wrote:
> The kernel version is &qu
I ran into a series of crashes within scsi_remove_target in SUSE 12 SP1
(3.12.49-11-default). This will happen very easily if there is a lot of disks
with many storage and host FC ports. It occurs when all the ports are timeout
at the same time. 50 disks for each rports (the same 50 LUNs), 4 rpo
On Fri, 2017-05-19 at 09:36 +, Dashi DS1 Cao wrote:
> It seems there is a race of multiple "fc_starget_delete" of the same
> rport, thus of the same SCSI host. The race leads to the race of
> scsi_remove_target and it cannot be prevented by the code snippet
> alone, e
Hi,
The TI ICDI is an integrated debugger interface for its TM4C series
microcontroller chip. It is a USB interface which can be used just like a USB
serial device.
A few lines of codes added to the file "drivers/usb/serial/usb-serial-simple.c"
accomplishes this job. And it can be used to upload
Sorry! Should have submitted the patch inline:
---
drivers/usb/serial/usb-serial-simple.c | 8 +++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/serial/usb-serial-simple.c
b/drivers/usb/serial/usb-serial-simple.c
index e98b6e5..7727eab 100644
--- a/drivers/usb/ser
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