On Fri, 15 Dec 2006 16:44:14 -0500 Trond Myklebust <[EMAIL PROTECTED]> wrote:
> However it is true that the > trace you sent indicated that XFree86 was hanging in iput(). We know what the bug is, don't we? > > XFree86 D 00000003 0 2471 2453 (NOTLB) > > c4871c0c 00003082 c86b72bc 00000003 cb7c94a4 0000001d 3b67f3ff > > c0146dd2 > > c1184180 cb3e7110 00000000 001ec7ff a60f8097 00000089 c02e1e60 > > cb3e7000 > > c1184180 00000000 c1180030 c4871c18 c028c7d8 c4871c5c c01435b6 > > c01435f3 > > Call Trace: > > [<c0146dd2>] free_pages_bulk+0x1d/0x1d4 > > [<c028c7d8>] io_schedule+0x26/0x30 > > [<c01435b6>] sync_page+0x0/0x40 > > [<c01435f3>] sync_page+0x3d/0x40 > > [<c028c9ce>] __wait_on_bit_lock+0x2c/0x52 > > [<c0143c13>] __lock_page+0x6a/0x72 > > [<c012ec77>] wake_bit_function+0x0/0x3c > > [<c012ec77>] wake_bit_function+0x0/0x3c > > [<c0149d2f>] pagevec_lookup+0x17/0x1d > > [<c014a085>] truncate_inode_pages_range+0x20a/0x260 > > [<c014a0e4>] truncate_inode_pages+0x9/0xc > > [<c0172c8a>] generic_delete_inode+0xb6/0x10f > > [<c0172e73>] iput+0x5f/0x61 > > [<c01706bd>] dentry_iput+0x68/0x83 > > [<c01707d8>] dput+0x100/0x118 > > [<ccb6c334>] put_nfs_open_context+0x67/0x88 [nfs] > > [<ccb701ed>] nfs_release_request+0x38/0x47 [nfs] > > [<ccb736dd>] nfs_wait_on_requests_locked+0x62/0x98 [nfs] > > [<ccb74c32>] nfs_sync_inode_wait+0x4a/0x130 [nfs] > > [<ccb6b639>] nfs_release_page+0x0/0x30 [nfs] > > [<ccb6b655>] nfs_release_page+0x1c/0x30 [nfs] > > [<c015f37c>] try_to_release_page+0x34/0x46 > > [<c014aa8b>] shrink_page_list+0x263/0x350 > > [<c0104db8>] do_IRQ+0x48/0x50 > > [<c01036c6>] common_interrupt+0x1a/0x20 > > [<c014acd7>] shrink_inactive_list+0x9b/0x248 > > [<c014b2fd>] shrink_zone+0xb5/0xd0 > > [<c014b382>] shrink_zones+0x6a/0x7e > > [<c014b48e>] try_to_free_pages+0xf8/0x1da > > [<c0147a18>] __alloc_pages+0x17c/0x278 > > [<c014f555>] do_anonymous_page+0x45/0x150 > > [<c014f9f7>] __handle_mm_fault+0xda/0x1bf > > [<c0115849>] do_page_fault+0x1c4/0x4bc > > [<c01021b7>] restore_sigcontext+0x10c/0x15f > > [<c0115685>] do_page_fault+0x0/0x4bc > > [<c0103809>] error_code+0x39/0x40 > > nfs_release_page() was called with a locked page. It's doing a bunch of > stuff which results in a call to truncate_inode_pages(), which will run > lock_page(), which is deadlocky. Now, arguably the VM shouldn't be calling try_to_release_page() with __GFP_FS when it's holding a lock on a page. But otoh, NFS should never be running lock_page() within nfs_release_page() against the page which was passed into nfs_release_page(). It'll deadlock for sure. So we could alter the VM to not pass in __GFP_FS in this situation, but nfs_release_page() would still be deadlocky. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
