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Date: Wed, 18 Aug 2010 10:12:17 +0800 From: Bian Naimeng <biannm@...fujitsu.com> To: Trond Myklebust <Trond.Myklebust@...app.com> CC: Adam Lackorzynski <adam@...inf.tu-dresden.de>, linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org, stable@...nel.org Subject: Re: 2.6.35.2: NFS related Oops > On Tue, 2010-08-17 at 19:14 +0200, Adam Lackorzynski wrote: >> On Tue Aug 17, 2010 at 18:09:53 +0800, Bian Naimeng wrote: >>> Please try to apply the followed patch. >> Thanks, this fixes the Oops. Patch is required for both 2.6.35 and >> 2.6.36 trees. ... snip ... >> /* We can't create new files, or truncate existing ones here */ >> openflags &= ~(O_CREAT|O_TRUNC); >> -- > > Nope. The problem is the recent switch to LOOKUP_EXCL as the authority > for whether or not we're doing an exclusive create. > > Does the following patch work? > Hi Trond, i guess it's not work. As i see, if we want get LOOKUP_EXCL at nd->flags, we must open file with O_CREAT and O_EXCL, "nd->flags & LOOKUP_EXCL" have the same effect with "(openflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)", so i think the kernel still crash, right? -- Regards Bian Naimeng > ----------------------------------------------------------------------------------------------- > NFS: Fix an Oops in the NFSv4 atomic open code > > From: Trond Myklebust <Trond.Myklebust@...app.com> > > Adam Lackorzynski reports: > > with 2.6.35.2 I'm getting this reproducible Oops: > > [ 110.825396] BUG: unable to handle kernel NULL pointer dereference at > (null) > [ 110.828638] IP: [<ffffffff811247b7>] encode_attrs+0x1a/0x2a4 > [ 110.828638] PGD be89f067 PUD bf18f067 PMD 0 > [ 110.828638] Oops: 0000 [#1] SMP > [ 110.828638] last sysfs file: /sys/class/net/lo/operstate > [ 110.828638] CPU 2 > [ 110.828638] Modules linked in: rtc_cmos rtc_core rtc_lib amd64_edac_mod > i2c_amd756 edac_core i2c_core dm_mirror dm_region_hash dm_log dm_snapshot > sg sr_mod usb_storage ohci_hcd mptspi tg3 mptscsih mptbase usbcore nls_base > [last unloaded: scsi_wait_scan] > [ 110.828638] > [ 110.828638] Pid: 11264, comm: setchecksum Not tainted 2.6.35.2 #1 > [ 110.828638] RIP: 0010:[<ffffffff811247b7>] [<ffffffff811247b7>] > encode_attrs+0x1a/0x2a4 > [ 110.828638] RSP: 0000:ffff88003bf5b878 EFLAGS: 00010296 > [ 110.828638] RAX: ffff8800bddb48a8 RBX: ffff88003bf5bb18 RCX: > 0000000000000000 > [ 110.828638] RDX: ffff8800be258800 RSI: 0000000000000000 RDI: > ffff88003bf5b9f8 > [ 110.828638] RBP: 0000000000000000 R08: ffff8800bddb48a8 R09: > 0000000000000004 > [ 110.828638] R10: 0000000000000003 R11: ffff8800be779000 R12: > ffff8800be258800 > [ 110.828638] R13: ffff88003bf5b9f8 R14: ffff88003bf5bb20 R15: > ffff8800be258800 > [ 110.828638] FS: 0000000000000000(0000) GS:ffff880041e00000(0063) > knlGS:00000000556bd6b0 > [ 110.828638] CS: 0010 DS: 002b ES: 002b CR0: 000000008005003b > [ 110.828638] CR2: 0000000000000000 CR3: 00000000be8ef000 CR4: > 00000000000006e0 > [ 110.828638] DR0: 0000000000000000 DR1: 0000000000000000 DR2: > 0000000000000000 > [ 110.828638] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: > 0000000000000400 > [ 110.828638] Process setchecksum (pid: 11264, threadinfo > ffff88003bf5a000, task ffff88003f232210) > [ 110.828638] Stack: > [ 110.828638] 0000000000000000 ffff8800bfbcf920 0000000000000000 > 0000000000000ffe > [ 110.828638] <0> 0000000000000000 0000000000000000 0000000000000000 > 0000000000000000 > [ 110.828638] <0> 0000000000000000 0000000000000000 0000000000000000 > 0000000000000000 > [ 110.828638] Call Trace: > [ 110.828638] [<ffffffff81124c1f>] ? nfs4_xdr_enc_setattr+0x90/0xb4 > [ 110.828638] [<ffffffff81371161>] ? call_transmit+0x1c3/0x24a > [ 110.828638] [<ffffffff813774d9>] ? __rpc_execute+0x78/0x22a > [ 110.828638] [<ffffffff81371a91>] ? rpc_run_task+0x21/0x2b > [ 110.828638] [<ffffffff81371b7e>] ? rpc_call_sync+0x3d/0x5d > [ 110.828638] [<ffffffff8111e284>] ? _nfs4_do_setattr+0x11b/0x147 > [ 110.828638] [<ffffffff81109466>] ? nfs_init_locked+0x0/0x32 > [ 110.828638] [<ffffffff810ac521>] ? ifind+0x4e/0x90 > [ 110.828638] [<ffffffff8111e2fb>] ? nfs4_do_setattr+0x4b/0x6e > [ 110.828638] [<ffffffff8111e634>] ? nfs4_do_open+0x291/0x3a6 > [ 110.828638] [<ffffffff8111ed81>] ? nfs4_open_revalidate+0x63/0x14a > [ 110.828638] [<ffffffff811056c4>] ? nfs_open_revalidate+0xd7/0x161 > [ 110.828638] [<ffffffff810a2de4>] ? do_lookup+0x1a4/0x201 > [ 110.828638] [<ffffffff810a4733>] ? link_path_walk+0x6a/0x9d5 > [ 110.828638] [<ffffffff810a42b6>] ? do_last+0x17b/0x58e > [ 110.828638] [<ffffffff810a5fbe>] ? do_filp_open+0x1bd/0x56e > [ 110.828638] [<ffffffff811cd5e0>] ? _atomic_dec_and_lock+0x30/0x48 > [ 110.828638] [<ffffffff810a9b1b>] ? dput+0x37/0x152 > [ 110.828638] [<ffffffff810ae063>] ? alloc_fd+0x69/0x10a > [ 110.828638] [<ffffffff81099f39>] ? do_sys_open+0x56/0x100 > [ 110.828638] [<ffffffff81027a22>] ? ia32_sysret+0x0/0x5 > [ 110.828638] Code: 83 f1 01 e8 f5 ca ff ff 48 83 c4 50 5b 5d 41 5c c3 41 > 57 41 56 41 55 49 89 fd 41 54 49 89 d4 55 48 89 f5 53 48 81 ec 18 01 00 00 > <8b> 06 89 c2 83 e2 08 83 fa 01 19 db 83 e3 f8 83 c3 18 a8 01 8d > [ 110.828638] RIP [<ffffffff811247b7>] encode_attrs+0x1a/0x2a4 > [ 110.828638] RSP <ffff88003bf5b878> > [ 110.828638] CR2: 0000000000000000 > [ 112.840396] ---[ end trace 95282e83fd77358f ]--- > > It looks as if Al Viro's commit 3516586a424ea5727be089da6541cbd5644f0497 > (make O_EXCL in nd->intent.flags visible in nd->flags) missed a case. > > Cc: stable@...nel.org > Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com> > --- > > fs/nfs/dir.c | 2 +- > 1 files changed, 1 insertions(+), 1 deletions(-) > > > diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c > index bd91b27..275efac 100644 > --- a/fs/nfs/dir.c > +++ b/fs/nfs/dir.c > @@ -1107,7 +1107,7 @@ static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd) > goto no_open_dput; > openflags = nd->intent.open.flags; > /* We cannot do exclusive creation on a positive dentry */ > - if ((openflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) > + if (nd->flags & LOOKUP_EXCL) > goto no_open_dput; > /* We can't create new files, or truncate existing ones here */ > openflags &= ~(O_CREAT|O_TRUNC); > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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