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#0  sub_preempt_count (val=1) at sched.c:2847
2847    }
------------------------------
(gdb) info thread
  2 process 17500  generic_file_buffered_write (iocb=0xf4a4de4c, iov=0xf2814f80, nr_segs=16, pos=Unhandled dwarf expression opcode 0x93
)
    at filemap.c:1980
* 1 process 16395  sub_preempt_count (val=1) at sched.c:2847
(gdb) thread 2
[Switching to thread 2 (process 17500)]#0  generic_file_buffered_write (iocb=0xf4a4de4c,
    iov=0xf2814f80, nr_segs=16, pos=Unhandled dwarf expression opcode 0x93
) at filemap.c:1980
1980                                            buf = cur_iov->iov_base + iov_base;
------------------------------
(gdb) bt
#0  generic_file_buffered_write (iocb=0xf4a4de4c, iov=0xf2814f80, nr_segs=16, pos=Unhandled dwarf expression opcode 0x93
) at filemap.c:1980
#1  0xc0149c56 in __generic_file_aio_write_nolock (iocb=0xf4a4de4c, iov=0xf2814f80, nr_segs=16,
    ppos=0xf4a4dfa4) at filemap.c:2096
#2  0xc014a043 in __generic_file_write_nolock (file=0x80, iov=0x80, nr_segs=128, ppos=0x80)
    at filemap.c:2134
#3  0xc014a43a in generic_file_writev (file=0xf36b5680, iov=0x80, nr_segs=128, ppos=0xf4a4dfa4)
    at filemap.c:2229
#4  0xc016956b in do_readv_writev (type=1, file=0xf36b5680, uvector=0x80, nr_segs=16, pos=0xf4a4dfa4)
    at read_write.c:496
#5  0xc0169628 in vfs_writev (file=0xf36b5680, vec=0x80, vlen=128, pos=0x80) at read_write.c:559
#6  0xc016972b in sys_writev (fd=128, vec=0x80, vlen=128) at read_write.c:595
#7  0xc01031eb in sysenter_past_esp () at atomic.h:175
#8  0x00000005 in ?? ()
#9  0xbf963e30 in ?? ()
#10 0x00000010 in ?? ()
#11 0x00000010 in ?? ()
#12 0x40142bf8 in ?? ()
#13 0xbf963d38 in ?? ()
#14 0x00000092 in ?? ()
#15 0x0000007b in ?? ()
#16 0xc010007b in startup_32_smp () at head.S:146
#17 0x00000092 in ?? ()
#18 0xffffe410 in ?? ()
#19 0x00000073 in ?? ()
#20 0x00000212 in ?? ()
#21 0xbf963d10 in ?? ()
#22 0x0000007b in ?? ()
#23 0x00000000 in ?? ()
#24 0x00000000 in ?? ()
#25 0xf7213a20 in ?? ()
---Type <return> to continue, or q <return> to quit---q
Quit
------------------------------
(gdb) list generic_file_buffered_write
1887
1888    ssize_t
1889    generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
1890                    unsigned long nr_segs, loff_t pos, loff_t *ppos,
1891                    size_t count, ssize_t written)
1892    {
1893            struct file *file = iocb->ki_filp;
1894            struct address_space * mapping = file->f_mapping;
1895            struct address_space_operations *a_ops = mapping->a_ops;
1896            struct inode    *inode = mapping->host;
------------------------------
(gdb) list __generic_file_aio_write_nolock
2024    EXPORT_SYMBOL(generic_file_buffered_write);
2025
2026    ssize_t
2027    __generic_file_aio_write_nolock(struct kiocb *iocb, const struct iovec *iov,
2028                                    unsigned long nr_segs, loff_t *ppos)
2029    {
2030            struct file *file = iocb->ki_filp;
2031            struct address_space * mapping = file->f_mapping;
2032            size_t ocount;          /* original count */
2033            size_t count;           /* after file limit checks */
------------------------------
(gdb) list
2034            struct inode    *inode = mapping->host;
2035            unsigned long   seg;
2036            loff_t          pos;
2037            ssize_t         written;
2038            ssize_t         err;
2039
2040            ocount = 0;
2041            for (seg = 0; seg < nr_segs; seg++) {
2042                    const struct iovec *iv = &iov[seg];

------------------------------
(gdb) info args
iocb = (struct kiocb *) 0xf4a4de4c
iov = (const struct iovec *) 0xf2814f80
nr_segs = 16
pos = Unhandled dwarf expression opcode 0x93