linux/fs/lockd
J. Bruce Fields 7c17705e77 lockd: fix rpcbind crash on lockd startup failure
Nikita Yuschenko reported that booting a kernel with init=/bin/sh and
then nfs mounting without portmap or rpcbind running using a busybox
mount resulted in:

  # mount -t nfs 10.30.130.21:/opt /mnt
  svc: failed to register lockdv1 RPC service (errno 111).
  lockd_up: makesock failed, error=-111
  Unable to handle kernel paging request for data at address 0x00000030
  Faulting instruction address: 0xc055e65c
  Oops: Kernel access of bad area, sig: 11 [#1]
  MPC85xx CDS
  Modules linked in:
  CPU: 0 PID: 1338 Comm: mount Not tainted 3.10.44.cge #117
  task: cf29cea0 ti: cf35c000 task.ti: cf35c000
  NIP: c055e65c LR: c0566490 CTR: c055e648
  REGS: cf35dad0 TRAP: 0300   Not tainted  (3.10.44.cge)
  MSR: 00029000 <CE,EE,ME>  CR: 22442488  XER: 20000000
  DEAR: 00000030, ESR: 00000000

  GPR00: c05606f4 cf35db80 cf29cea0 cf0ded80 cf0dedb8 00000001 1dec3086
  00000000
  GPR08: 00000000 c07b1640 00000007 1dec3086 22442482 100b9758 00000000
  10090ae8
  GPR16: 00000000 000186a5 00000000 00000000 100c3018 bfa46edc 100b0000
  bfa46ef0
  GPR24: cf386ae0 c07834f0 00000000 c0565f88 00000001 cf0dedb8 00000000
  cf0ded80
  NIP [c055e65c] call_start+0x14/0x34
  LR [c0566490] __rpc_execute+0x70/0x250
  Call Trace:
  [cf35db80] [00000080] 0x80 (unreliable)
  [cf35dbb0] [c05606f4] rpc_run_task+0x9c/0xc4
  [cf35dbc0] [c0560840] rpc_call_sync+0x50/0xb8
  [cf35dbf0] [c056ee90] rpcb_register_call+0x54/0x84
  [cf35dc10] [c056f24c] rpcb_register+0xf8/0x10c
  [cf35dc70] [c0569e18] svc_unregister.isra.23+0x100/0x108
  [cf35dc90] [c0569e38] svc_rpcb_cleanup+0x18/0x30
  [cf35dca0] [c0198c5c] lockd_up+0x1dc/0x2e0
  [cf35dcd0] [c0195348] nlmclnt_init+0x2c/0xc8
  [cf35dcf0] [c015bb5c] nfs_start_lockd+0x98/0xec
  [cf35dd20] [c015ce6c] nfs_create_server+0x1e8/0x3f4
  [cf35dd90] [c0171590] nfs3_create_server+0x10/0x44
  [cf35dda0] [c016528c] nfs_try_mount+0x158/0x1e4
  [cf35de20] [c01670d0] nfs_fs_mount+0x434/0x8c8
  [cf35de70] [c00cd3bc] mount_fs+0x20/0xbc
  [cf35de90] [c00e4f88] vfs_kern_mount+0x50/0x104
  [cf35dec0] [c00e6e0c] do_mount+0x1d0/0x8e0
  [cf35df10] [c00e75ac] SyS_mount+0x90/0xd0
  [cf35df40] [c000ccf4] ret_from_syscall+0x0/0x3c

The addition of svc_shutdown_net() resulted in two calls to
svc_rpcb_cleanup(); the second is no longer necessary and crashes when
it calls rpcb_register_call with clnt=NULL.

Reported-by: Nikita Yushchenko <nyushchenko@dev.rtsoft.ru>
Fixes: 679b033df4 "lockd: ensure we tear down any live sockets when socket creation fails during lockd_up"
Cc: stable@vger.kernel.org
Acked-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
2014-09-08 12:03:32 -04:00
..
Makefile lockd: Introduce new-style XDR functions for NLMv4 2010-12-16 12:37:23 -05:00
clnt4xdr.c nfsd: remove <linux/nfsd/nfsfh.h> 2014-05-06 17:54:53 -04:00
clntlock.c LOCKD: Don't call utsname()->nodename from nlmclnt_setlockargs 2013-08-05 15:03:46 -04:00
clntproc.c LOCKD: Don't call utsname()->nodename from nlmclnt_setlockargs 2013-08-05 15:03:46 -04:00
clntxdr.c nfsd: remove <linux/nfsd/nfsfh.h> 2014-05-06 17:54:53 -04:00
grace.c LockD: pass actual network namespace to grace period management functions 2012-07-27 16:49:22 -04:00
host.c Merge branch 'for-3.9' of git://linux-nfs.org/~bfields/linux 2013-02-28 18:02:55 -08:00
mon.c fs: lockd: Use ktime_get_ns() 2014-07-23 15:01:44 -07:00
netns.h lockd: per-net NSM client creation and destruction helpers introduced 2012-10-01 15:27:34 -07:00
svc.c lockd: fix rpcbind crash on lockd startup failure 2014-09-08 12:03:32 -04:00
svc4proc.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-08-01 10:26:23 -07:00
svclock.c lockd: send correct lock when granting a delayed lock. 2014-02-13 14:55:02 -05:00
svcproc.c NLM: nlm_lookup_file() may return NLMv4-specific error codes 2012-10-17 10:14:14 -04:00
svcshare.c lockd: fix sparse warning in svcshare.c 2008-04-23 16:13:39 -04:00
svcsubs.c nfsd: move <linux/nfsd/export.h> to fs/nfsd 2014-05-06 17:54:54 -04:00
xdr.c nfsd: remove <linux/nfsd/nfsfh.h> 2014-05-06 17:54:53 -04:00
xdr4.c lockd: Introduce new-style XDR functions for NLMv4 2010-12-16 12:37:23 -05:00