13a9a9d74d
On platforms that implement flush_dcache_page(), a large NFS WRITE
triggers the WARN_ONCE in bvec_iter_advance():
Sep 20 14:01:05 klimt.1015granger.net kernel: Attempted to advance past end of bvec iter
Sep 20 14:01:05 klimt.1015granger.net kernel: WARNING: CPU: 0 PID: 1032 at include/linux/bvec.h:101 bvec_iter_advance.isra.0+0xa7/0x158 [sunrpc]
Sep 20 14:01:05 klimt.1015granger.net kernel: Call Trace:
Sep 20 14:01:05 klimt.1015granger.net kernel: svc_tcp_recvfrom+0x60c/0x12c7 [sunrpc]
Sep 20 14:01:05 klimt.1015granger.net kernel: ? bvec_iter_advance.isra.0+0x158/0x158 [sunrpc]
Sep 20 14:01:05 klimt.1015granger.net kernel: ? del_timer_sync+0x4b/0x55
Sep 20 14:01:05 klimt.1015granger.net kernel: ? test_bit+0x1d/0x27 [sunrpc]
Sep 20 14:01:05 klimt.1015granger.net kernel: svc_recv+0x1193/0x15e4 [sunrpc]
Sep 20 14:01:05 klimt.1015granger.net kernel: ? try_to_freeze.isra.0+0x6f/0x6f [sunrpc]
Sep 20 14:01:05 klimt.1015granger.net kernel: ? refcount_sub_and_test.constprop.0+0x13/0x40 [sunrpc]
Sep 20 14:01:05 klimt.1015granger.net kernel: ? svc_xprt_put+0x1e/0x29f [sunrpc]
Sep 20 14:01:05 klimt.1015granger.net kernel: ? svc_send+0x39f/0x3c1 [sunrpc]
Sep 20 14:01:05 klimt.1015granger.net kernel: nfsd+0x282/0x345 [nfsd]
Sep 20 14:01:05 klimt.1015granger.net kernel: ? __kthread_parkme+0x74/0xba
Sep 20 14:01:05 klimt.1015granger.net kernel: kthread+0x2ad/0x2bc
Sep 20 14:01:05 klimt.1015granger.net kernel: ? nfsd_destroy+0x124/0x124 [nfsd]
Sep 20 14:01:05 klimt.1015granger.net kernel: ? test_bit+0x1d/0x27
Sep 20 14:01:05 klimt.1015granger.net kernel: ? kthread_mod_delayed_work+0x115/0x115
Sep 20 14:01:05 klimt.1015granger.net kernel: ret_from_fork+0x22/0x30
Reported-by: He Zhe <zhe.he@windriver.com>
Fixes: ca07eda33e01 ("SUNRPC: Refactor svc_recvfrom()")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.