Hi all, I've been running into the following warning on an arm64 system running 3.17-rc6 with 64k pages. I've been unable to reproduce with a smaller page size (4k). I don't yet have a concrete reproducer, but I've seen it hit a few times today just running a machine with an NFS root filesystem and using ssh. The warning seems to happen in parallel on the two CPUs, but I'm pretty confident that our test_and_clear_bit implementation has the relevant atomic instructions and memory barriers. Any ideas? Will --->8 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 1023 at fs/nfs/write.c:743 nfs_inode_remove_request+0xe4/0xf0() Modules linked in: CPU: 1 PID: 1023 Comm: kworker/1:2 Not tainted 3.17.0-rc6 #1 Workqueue: nfsiod rpc_async_release Call trace: [<fffffe0000096410>] dump_backtrace+0x0/0x130 [<fffffe0000096550>] show_stack+0x10/0x1c [<fffffe00004cda94>] dump_stack+0x74/0xbc [<fffffe00000b4d20>] warn_slowpath_common+0x8c/0xb4 [<fffffe00000b4e0c>] warn_slowpath_null+0x14/0x20 [<fffffe000027a6a8>] nfs_inode_remove_request+0xe0/0xf0 [<fffffe000027b704>] nfs_write_completion+0xb4/0x150 [<fffffe0000276ef4>] nfs_pgio_release+0x34/0x44 [<fffffe00004ac2d0>] rpc_free_task+0x24/0x4c [<fffffe00004ac5c0>] rpc_async_release+0xc/0x18 [<fffffe00000c89e8>] process_one_work+0x140/0x32c [<fffffe00000c9338>] worker_thread+0x13c/0x470 [<fffffe00000cd9e4>] kthread+0xd0/0xe8 ---[ end trace 6f044efb83f0811b ]--- ------------[ cut here ]------------ WARNING: CPU: 0 PID: 621 at fs/nfs/write.c:743 nfs_inode_remove_request+0xe4/0xf0() CPU: 0 PID: 621 Comm: kworker/0:2 Tainted: G W 3.17.0-rc6 #1 Workqueue: nfsiod rpc_async_release Call trace: [<fffffe0000096410>] dump_backtrace+0x0/0x130 [<fffffe0000096550>] show_stack+0x10/0x1c [<fffffe00004cda94>] dump_stack+0x74/0xbc [<fffffe00000b4d20>] warn_slowpath_common+0x8c/0xb4 [<fffffe00000b4e0c>] warn_slowpath_null+0x14/0x20 [<fffffe000027a6a8>] nfs_inode_remove_request+0xe0/0xf0 [<fffffe000027b704>] nfs_write_completion+0xb4/0x150 [<fffffe0000276ef4>] nfs_pgio_release+0x34/0x44 [<fffffe00004ac2d0>] rpc_free_task+0x24/0x4c [<fffffe00004ac5c0>] rpc_async_release+0xc/0x18 [<fffffe00000c89e8>] process_one_work+0x140/0x32c [<fffffe00000c9338>] worker_thread+0x13c/0x470 [<fffffe00000cd9e4>] kthread+0xd0/0xe8 ---[ end trace 6f044efb83f0811c ]--- -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
