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由 Peter Zijlstra 提交于
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: NPeter 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: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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