Commits
Weston Andros Adamson committed d201c4de518
pnfs: fix race in filelayout commit path Hold the lock while modifying commit info dataserver buckets. The following oops can be reproduced by running iozone for a while against a 2 DS pynfs filelayout server. general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC Modules linked in: nfs_layout_nfsv41_files rpcsec_gss_krb5 nfsv4 nfs fscache CPU: 0 PID: 903 Comm: iozone Not tainted 3.15.0-rc1-branch-dros_testing+ #44 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference task: ffff880078164480 ti: ffff88006e972000 task.ti: ffff88006e972000 RIP: 0010:[<ffffffffa01936e1>] [<ffffffffa01936e1>] nfs_init_commit+0x22/0x RSP: 0018:ffff88006e973d30 EFLAGS: 00010246 RAX: ffff88006e973e00 RBX: ffff88006e828800 RCX: ffff88006e973e10 RDX: 0000000000000000 RSI: ffff88006e973e00 RDI: dead4ead00000000 RBP: ffff88006e973d38 R08: ffff88006e8289d8 R09: 0000000000000000 R10: ffff88006e8289d8 R11: 0000000000016988 R12: ffff88006e973b98 R13: ffff88007a0a6648 R14: ffff88006e973e10 R15: ffff88006e828800 FS: 00007f2ce396b740(0000) GS:ffff88007f200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f03278a1000 CR3: 0000000079043000 CR4: 00000000001407f0 Stack: ffff88006e8289d8 ffff88006e973da8 ffffffffa00f144f ffff88006e9478c0 ffff88006e973e00 ffff88006de21080 0000000100000002 ffff880079be6c48 ffff88006e973d70 ffff88006e973d70 ffff88006e973e10 ffff88006de21080 Call Trace: [<ffffffffa00f144f>] filelayout_commit_pagelist+0x1ae/0x34a [nfs_layout_nfsv [<ffffffffa0194f72>] nfs_generic_commit_list+0x92/0xc4 [nfs] [<ffffffffa0195053>] nfs_commit_inode+0xaf/0x114 [nfs] [<ffffffffa01892bd>] nfs_file_fsync_commit+0x82/0xbe [nfs] [<ffffffffa01ceb0d>] nfs4_file_fsync+0x59/0x9b [nfsv4] [<ffffffff8114ee3c>] vfs_fsync_range+0x18/0x20 [<ffffffff8114ee60>] vfs_fsync+0x1c/0x1e [<ffffffffa01891c2>] nfs_file_flush+0x7f/0x84 [nfs] [<ffffffff81127a43>] filp_close+0x3c/0x72 [<ffffffff81140e12>] __close_fd+0x82/0x9a [<ffffffff81127a9c>] SyS_close+0x23/0x4c [<ffffffff814acd12>] system_call_fastpath+0x16/0x1b Code: 5b 41 5c 41 5d 41 5e 5d c3 0f 1f 44 00 00 55 48 89 e5 53 48 89 fb 48 8 RIP [<ffffffffa01936e1>] nfs_init_commit+0x22/0xe1 [nfs] RSP <ffff88006e973d30> ---[ end trace 732fe6419b235e2f ]--- Suggested-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Weston Andros Adamson <dros@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>