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Peter Zijlstra 12fd352038 [PATCH] nfsd: lockdep annotation 
while doing a kernel make modules_install install over an NFS mount.

  =============================================
  [ INFO: possible recursive locking detected ]
  ---------------------------------------------
  nfsd/9550 is trying to acquire lock:
   (&inode->i_mutex){--..}, at: [<c034c845>] mutex_lock+0x1c/0x1f

  but task is already holding lock:
   (&inode->i_mutex){--..}, at: [<c034c845>] mutex_lock+0x1c/0x1f

  other info that might help us debug this:
  2 locks held by nfsd/9550:
   #0:  (hash_sem){..--}, at: [<cc895223>] exp_readlock+0xd/0xf [nfsd]
   #1:  (&inode->i_mutex){--..}, at: [<c034c845>] mutex_lock+0x1c/0x1f

  stack backtrace:
   [<c0103508>] show_trace_log_lvl+0x58/0x152
   [<c0103b8b>] show_trace+0xd/0x10
   [<c0103c2f>] dump_stack+0x19/0x1b
   [<c012aa57>] __lock_acquire+0x77a/0x9a3
   [<c012af4a>] lock_acquire+0x60/0x80
   [<c034c6c2>] __mutex_lock_slowpath+0xa7/0x20e
   [<c034c845>] mutex_lock+0x1c/0x1f
   [<c0162edc>] vfs_unlink+0x34/0x8a
   [<cc891d98>] nfsd_unlink+0x18f/0x1e2 [nfsd]
   [<cc89884f>] nfsd3_proc_remove+0x95/0xa2 [nfsd]
   [<cc88f0d4>] nfsd_dispatch+0xc0/0x178 [nfsd]
   [<c033e84d>] svc_process+0x3a5/0x5ed
   [<cc88f5ba>] nfsd+0x1a7/0x305 [nfsd]
   [<c0101005>] kernel_thread_helper+0x5/0xb
  DWARF2 unwinder stuck at kernel_thread_helper+0x5/0xb
  Leftover inexact backtrace:
   [<c0103b8b>] show_trace+0xd/0x10
   [<c0103c2f>] dump_stack+0x19/0x1b
   [<c012aa57>] __lock_acquire+0x77a/0x9a3
   [<c012af4a>] lock_acquire+0x60/0x80
   [<c034c6c2>] __mutex_lock_slowpath+0xa7/0x20e
   [<c034c845>] mutex_lock+0x1c/0x1f
   [<c0162edc>] vfs_unlink+0x34/0x8a
   [<cc891d98>] nfsd_unlink+0x18f/0x1e2 [nfsd]
   [<cc89884f>] nfsd3_proc_remove+0x95/0xa2 [nfsd]
   [<cc88f0d4>] nfsd_dispatch+0xc0/0x178 [nfsd]
   [<c033e84d>] svc_process+0x3a5/0x5ed
   [<cc88f5ba>] nfsd+0x1a7/0x305 [nfsd]
   [<c0101005>] kernel_thread_helper+0x5/0xb

  =============================================
  [ INFO: possible recursive locking detected ]
  ---------------------------------------------
  nfsd/9580 is trying to acquire lock:
   (&inode->i_mutex){--..}, at: [<c034cc1d>] mutex_lock+0x1c/0x1f

  but task is already holding lock:
   (&inode->i_mutex){--..}, at: [<c034cc1d>] mutex_lock+0x1c/0x1f

  other info that might help us debug this:
  2 locks held by nfsd/9580:
   #0:  (hash_sem){..--}, at: [<cc89522b>] exp_readlock+0xd/0xf [nfsd]
   #1:  (&inode->i_mutex){--..}, at: [<c034cc1d>] mutex_lock+0x1c/0x1f

  stack backtrace:
   [<c0103508>] show_trace_log_lvl+0x58/0x152
   [<c0103b8b>] show_trace+0xd/0x10
   [<c0103c2f>] dump_stack+0x19/0x1b
   [<c012aa63>] __lock_acquire+0x77a/0x9a3
   [<c012af56>] lock_acquire+0x60/0x80
   [<c034ca9a>] __mutex_lock_slowpath+0xa7/0x20e
   [<c034cc1d>] mutex_lock+0x1c/0x1f
   [<cc892ad1>] nfsd_setattr+0x2c8/0x499 [nfsd]
   [<cc893ede>] nfsd_create_v3+0x31b/0x4ac [nfsd]
   [<cc8984a1>] nfsd3_proc_create+0x128/0x138 [nfsd]
   [<cc88f0d4>] nfsd_dispatch+0xc0/0x178 [nfsd]
   [<c033ec1d>] svc_process+0x3a5/0x5ed
   [<cc88f5ba>] nfsd+0x1a7/0x305 [nfsd]
   [<c0101005>] kernel_thread_helper+0x5/0xb
  DWARF2 unwinder stuck at kernel_thread_helper+0x5/0xb
  Leftover inexact backtrace:
   [<c0103b8b>] show_trace+0xd/0x10
   [<c0103c2f>] dump_stack+0x19/0x1b
   [<c012aa63>] __lock_acquire+0x77a/0x9a3
   [<c012af56>] lock_acquire+0x60/0x80
   [<c034ca9a>] __mutex_lock_slowpath+0xa7/0x20e
   [<c034cc1d>] mutex_lock+0x1c/0x1f
   [<cc892ad1>] nfsd_setattr+0x2c8/0x499 [nfsd]
   [<cc893ede>] nfsd_create_v3+0x31b/0x4ac [nfsd]
   [<cc8984a1>] nfsd3_proc_create+0x128/0x138 [nfsd]
   [<cc88f0d4>] nfsd_dispatch+0xc0/0x178 [nfsd]
   [<c033ec1d>] svc_process+0x3a5/0x5ed
   [<cc88f5ba>] nfsd+0x1a7/0x305 [nfsd]
   [<c0101005>] kernel_thread_helper+0x5/0xb

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Neil Brown <neilb@suse.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-02 07:57:20 -07:00
..
acpi Pull acpi_os_allocate into test branch 2006-07-10 02:39:47 -04:00
asm-alpha [PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks 2006-10-01 00:39:21 -07:00
asm-arm [PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks 2006-10-01 00:39:21 -07:00
asm-arm26 [PATCH] consistently use MAX_ERRNO in __syscall_return 2006-09-27 08:26:18 -07:00
asm-avr32 [PATCH] AVR32 MTD: Static Memory Controller driver 2006-09-26 08:48:54 -07:00
asm-cris [PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks 2006-10-01 00:39:21 -07:00
asm-frv [PATCH] paravirt: remove set pte atomic 2006-10-01 00:39:34 -07:00
asm-generic [PATCH] paravirt: remove set pte atomic 2006-10-01 00:39:34 -07:00
asm-h8300 [PATCH] remove SYSRQ_KEY and related defines from ppc/sh/h8300 2006-10-01 00:39:22 -07:00
asm-i386 [PATCH] Add regs_return_value() helper 2006-10-02 07:57:16 -07:00
asm-ia64 [PATCH] Add regs_return_value() helper 2006-10-02 07:57:16 -07:00
asm-m32r [PATCH] paravirt: remove set pte atomic 2006-10-01 00:39:34 -07:00
asm-m68k [PATCH] consistently use MAX_ERRNO in __syscall_return 2006-09-27 08:26:18 -07:00
asm-m68knommu [PATCH] consistently use MAX_ERRNO in __syscall_return 2006-09-27 08:26:18 -07:00
asm-mips [PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks 2006-10-01 00:39:21 -07:00
asm-parisc [PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks 2006-10-01 00:39:21 -07:00
asm-powerpc [PATCH] Add regs_return_value() helper 2006-10-02 07:57:16 -07:00
asm-ppc [PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks 2006-10-01 00:39:21 -07:00
asm-s390 [PATCH] Add regs_return_value() helper 2006-10-02 07:57:16 -07:00
asm-sh [PATCH] remove SYSRQ_KEY and related defines from ppc/sh/h8300 2006-10-01 00:39:22 -07:00
asm-sh64 [PATCH] ntp: cleanup defines and comments 2006-10-01 00:39:27 -07:00
asm-sparc [PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks 2006-10-01 00:39:21 -07:00
asm-sparc64 [PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks 2006-10-01 00:39:21 -07:00
asm-um [PATCH] uml: remove pte_mkexec 2006-09-29 09:18:04 -07:00
asm-v850 [PATCH] consistently use MAX_ERRNO in __syscall_return 2006-09-27 08:26:18 -07:00
asm-x86_64 [PATCH] Add regs_return_value() helper 2006-10-02 07:57:16 -07:00
asm-xtensa [PATCH] ntp: cleanup defines and comments 2006-10-01 00:39:27 -07:00
crypto [CRYPTO] digest: Added user API for new hash type 2006-09-21 11:46:17 +10:00
keys [PATCH] keys: discard the contents of a key on revocation 2006-06-26 09:58:18 -07:00
linux [PATCH] nfsd: lockdep annotation 2006-10-02 07:57:20 -07:00
math-emu
media Merge master.kernel.org:/pub/scm/linux/kernel/git/mchehab/v4l-dvb 2006-09-30 09:39:15 -07:00
mtd Merge git://git.infradead.org/~dwmw2/hdroneline 2006-09-22 12:56:22 -07:00
net [PATCH] Add genetlink utilities for payload length calculation 2006-10-01 00:39:29 -07:00
pcmcia Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
rdma IB/sa: fix ib_sa_selector names 2006-09-22 15:22:55 -07:00
rxrpc
scsi [PATCH] scsi: device_reprobe() can fail 2006-09-30 19:33:43 -07:00
sound [PATCH] maximum latency tracking: ALSA support 2006-10-01 00:39:19 -07:00
video [HEADERS] One line per header in Kbuild files to reduce conflicts 2006-09-19 12:43:58 +01:00
Kbuild [HEADERS] One line per header in Kbuild files to reduce conflicts 2006-09-19 12:43:58 +01:00