Shortly after upgrading to a kernel based on r288437 I got the following

Unread portion of the kernel message buffer:
[5112] panic: getblk: size(131072) > MAXBCACHEBUF(65536)
(kgdb) where
#0  doadump (textdump=0) at pcpu.h:221
#1  0xffffffff8030ca9e in db_dump (dummy=<value optimized out>, dummy2=false, 
dummy3=0, dummy4=0x0) at /usr/src/sys/ddb/db_command.c:533
#2  0xffffffff8030c651 in db_command (cmd_table=0x0) at 
#3  0xffffffff8030c2e4 in db_command_loop () at 
#4  0xffffffff8030ef0b in db_trap (type=<value optimized out>, code=0) at 
#5  0xffffffff805d3cd4 in kdb_trap (type=3, code=0, tf=<value optimized out>) 
at /usr/src/sys/kern/subr_kdb.c:654
#6  0xffffffff808651bf in trap (frame=0xfffffe009452b5f0) at 
#7  0xffffffff80849e4a in calltrap () at 
#8  0xffffffff805d33ae in kdb_enter (why=0xffffffff80953dc1 "panic", 
msg=0xffffffff805d9e90 "U[...]") at cpufunc.h:63
#9  0xffffffff805902b9 in vpanic (fmt=<value optimized out>, ap=<value 
optimized out>) at /usr/src/sys/kern/kern_shutdown.c:746
#10 0xffffffff80590103 in panic (fmt=0x0) at 
#11 0xffffffff806310e7 in getblk (vp=<value optimized out>, blkno=<value 
optimized out>, size=<value optimized out>, slpflag=<value optimized out>, 
slptimeo=<value optimized out>, flags=<value optimized out>)
    at /usr/src/sys/kern/vfs_bio.c:3324
#12 0xffffffff8063cf81 in vop_stdadvise (ap=<value optimized out>) at 
#13 0xffffffff808ec827 in VOP_ADVISE_APV (vop=<value optimized out>, a=<value 
optimized out>) at vnode_if.c:3848
#14 0xffffffff80662844 in vn_read (fp=<value optimized out>, uio=<value 
optimized out>, active_cred=<value optimized out>, flags=<value optimized out>, 
td=0x8) at vnode_if.h:1648
#15 0xffffffff8065e27a in vn_io_fault (fp=0xfffff8000631eaf0, 
uio=0xfffffe009452baa0, active_cred=0xfffffe009452b5a0, flags=0, td=0x8) at 
#16 0xffffffff805f0385 in dofileread (td=0xfffff800279fd9a0, fd=3, 
fp=0xfffff8000631eaf0, auio=0xfffffe009452baa0, offset=<value optimized out>, 
flags=50) at file.h:300
#17 0xffffffff805f00a8 in kern_readv (td=0xfffff800279fd9a0, fd=3, 
auio=0xfffffe009452baa0) at /usr/src/sys/kern/sys_generic.c:273
#18 0xffffffff805f0033 in sys_read (td=0x0, uap=<value optimized out>) at 
#19 0xffffffff808661e8 in amd64_syscall (td=0xfffff800279fd9a0, traced=0) at 
#20 0xffffffff8084a12b in Xfast_syscall () at 
#21 0x00000008014d752a in ?? ()
Previous frame inner to this frame (corrupt stack?)
Current language:  auto; currently minimal

The system was running for about 50 minutes before the panic occurred and
didn't do anything special at the time (running Xorg, Firefox, ssh ...).

I suspect r288431 and am currently compiling a kernel with the
commit reverted. The previous kernel was based on r288265.


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