Panics after AHCI timeouts

[Alexey Shuvaev]

On Sat, Oct 08, 2011 at 10:14:56PM +0200, Alexey Shuvaev wrote:
> Hello list!
> 
Errr... Replying to myself... Ping? Should I file a PR and put it
in the back burner? :)

> In the view of upcoming RELEASE-9.0 I should have reported it earlier,
> but it is better later than never... Every time I wanted to report
> this, the system was ~one month old and I tried to upgrade it
> to see, if the problem was still there, waiting for the next panic...
> and when it finally paniced it was one month old again.
> 
[snip]
> >From core.txt.5:
> [snip]
> Unread portion of the kernel message buffer:
> Memory modified after free 0xfffffe000416e200(248) val=79e8800 @ 0xfffffe000416e200
> panic: Most recently used by cred
> 
> cpuid = 2
> Uptime: 20h11m1s
> Dumping 1308 out of 7914 MB:..2%..12%..21%..31%..41%..51%..62%..71%..81%..91%
> [snip]
> #0  doadump (textdump=1) at /usr/src/sys/kern/kern_shutdown.c:252
> 252             if (textdump && textdump_pending) {
> (kgdb) #0  doadump (textdump=1) at /usr/src/sys/kern/kern_shutdown.c:252
> #1  0xffffffff808234aa in kern_reboot (howto=260)
>     at /usr/src/sys/kern/kern_shutdown.c:430
> #2  0xffffffff80822f41 in panic (fmt=Variable "fmt" is not available.
> )
>     at /usr/src/sys/kern/kern_shutdown.c:595
> #3  0xffffffff80a6f7b4 in mtrash_ctor (mem=Variable "mem" is not available.
> ) at /usr/src/sys/vm/uma_dbg.c:137
> #4  0xffffffff80a6f01c in uma_zalloc_arg (zone=0xfffffe021ffe0700, udata=0x0, 
>     flags=258) at /usr/src/sys/vm/uma_core.c:2018
> #5  0xffffffff808108be in malloc (size=Variable "size" is not available.
> ) at uma.h:305
> #6  0xffffffff8081c21f in crget () at /usr/src/sys/kern/kern_prot.c:1809
> #7  0xffffffff8081c269 in crdup (cr=0xfffffe0143103300)
>     at /usr/src/sys/kern/kern_prot.c:1911
> #8  0xffffffff808c5ca6 in kern_accessat (td=0xfffffe0007dd7000, fd=-100, 
>     path=0x80065c000 <Address 0x80065c000 out of bounds>, 
>     pathseg=UIO_USERSPACE, flags=Variable "flags" is not available.
> ) at /usr/src/sys/kern/vfs_syscalls.c:2201
> #9  0xffffffff8086719a in syscallenter (td=0xfffffe0007dd7000, 
>     sa=0xffffff8223f67bb0) at /usr/src/sys/kern/subr_trap.c:344
> #10 0xffffffff80b0b43c in syscall (frame=0xffffff8223f67c50)
>     at /usr/src/sys/amd64/amd64/trap.c:910
> #11 0xffffffff80af617d in Xfast_syscall ()
>     at /usr/src/sys/amd64/amd64/exception.S:384
> #12 0x000000080062dbdc in ?? ()
> Previous frame inner to this frame (corrupt stack?)
> [snip]
> [last message in dmesg]
> ahcich0: Timeout on slot 29 port 0
> ahcich0: is 00000000 cs 00000000 ss ffffffff rs ffffffff tfd 40 serr 00000000 cm
> d 0000fc17
> [snip]
>