Re: BUG in __key_instantiate_and_link(): unable to handle kernel paging request at 0000632e6472616f

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On 16. juni 2012 04:32, Andre Tomt wrote:
FWIW; I am (still) seeing this exact same crash several times an hour on
3.4.3-rc1 on Ubuntu 12.04 client. Only that the same second it happens,
all my three displays corrupts badly, becoming completely unreadable.
Switching to console and back usually gets my desktop back on two of
three displays, and sometimes it will need a full xserver restart.
Obviously some memory corruption going on.

One of the crashes also triggered a NX error:
[20292.196332] kernel tried to execute NX-protected page - exploit
attempt? (uid: 0)

And after a while, things start locking up.

It didn't really start happening until a few days ago though, I've been
running 3.4 for since some -rc through all the stable releases. Perhaps
server suddenly got a working idmapper or something? Its a debian
unstable updated a couple times a month.

Booting latest git master now, to see if any of the recent NFS fixes
just pulled by Linus fixes anything (-rc2 had other showstopper nfs
issues).

Just had it happen with 3.5-git as of a couple hours ago (last commit a2c2df8672f55195f101d9251117aa59e358d296): Jun 16 19:01:49 slurv kernel: [50823.271618] general protection fault: 0000 [#1] SMP
Jun 16 19:01:49 slurv kernel: [50823.271640] CPU 10
Jun 16 19:01:49 slurv kernel: [50823.271690]
Jun 16 19:01:49 slurv kernel: [50823.271698] Pid: 1678, comm: rpc.idmapd Not tainted 3.5.0-1-desktop #1 System manufacturer System Product Name/P6T DELUXE V2 Jun 16 19:01:49 slurv kernel: [50823.271738] RIP: 0010:[<ffffffff81129872>] [<ffffffff81129872>] __key_instantiate_and_link+0x52/0xcb Jun 16 19:01:49 slurv kernel: [50823.271767] RSP: 0018:ffff88061941bd38 EFLAGS: 00010246 Jun 16 19:01:49 slurv kernel: [50823.271785] RAX: 6337346330366233 RBX: ffff880606fb97f0 RCX: 0000000000000000 Jun 16 19:01:49 slurv kernel: [50823.271807] RDX: 0000000000000006 RSI: ffff88061941be85 RDI: ffff880606fb97f0 Jun 16 19:01:49 slurv kernel: [50823.271829] RBP: ffff88061941bd88 R08: ffff8802bc9ed380 R09: ffff88061941bdb0 Jun 16 19:01:49 slurv kernel: [50823.271850] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88061aad63c0 Jun 16 19:01:49 slurv kernel: [50823.271872] R13: ffff8802bc9ed380 R14: 0000000000000000 R15: ffff88061941bdb0 Jun 16 19:01:49 slurv kernel: [50823.271894] FS: 00007fd449a7d700(0000) GS:ffff88063fd40000(0000) knlGS:0000000000000000 Jun 16 19:01:49 slurv kernel: [50823.271919] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Jun 16 19:01:49 slurv kernel: [50823.271937] CR2: 00007f8844002028 CR3: 000000061be95000 CR4: 00000000000007e0 Jun 16 19:01:49 slurv kernel: [50823.271959] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Jun 16 19:01:49 slurv kernel: [50823.271980] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Jun 16 19:01:49 slurv kernel: [50823.272003] Process rpc.idmapd (pid: 1678, threadinfo ffff88061941a000, task ffff88061b870000)
Jun 16 19:01:49 slurv kernel: [50823.272028] Stack:
Jun 16 19:01:49 slurv kernel: [50823.272036] ffff88061941bd78 0000000000000006 ffff88061941be85 fffffff01aad63e8 Jun 16 19:01:49 slurv kernel: [50823.272060] ffff880606fb9840 ffff880606fb97f0 ffff88061aad63c0 0000000000000006 Jun 16 19:01:49 slurv kernel: [50823.272083] ffff88061941be85 00007fffe09c4500 ffff88061941bdd8 ffffffff81129943
Jun 16 19:01:49 slurv kernel: [50823.272106] Call Trace:
Jun 16 19:01:49 slurv kernel: [50823.272116] [<ffffffff81129943>] key_instantiate_and_link+0x58/0x80 Jun 16 19:01:49 slurv kernel: [50823.272145] [<ffffffffa058a906>] idmap_pipe_downcall+0x154/0x1ad [nfs] Jun 16 19:01:49 slurv kernel: [50823.272173] [<ffffffffa04aeae2>] rpc_pipe_write+0x56/0x6f [sunrpc] Jun 16 19:01:49 slurv kernel: [50823.272195] [<ffffffff810c86ce>] vfs_write+0xad/0x13d Jun 16 19:01:49 slurv kernel: [50823.272212] [<ffffffff810c8949>] sys_write+0x45/0x6c Jun 16 19:01:49 slurv kernel: [50823.272229] [<ffffffff8130a462>] system_call_fastpath+0x16/0x1b Jun 16 19:01:49 slurv kernel: [50823.272258] Code: 48 89 55 b8 48 89 75 c0 e8 16 e4 1d 00 48 8b 43 78 c7 45 cc f0 ff ff ff 48 8b 55 b8 48 8b 75 c0 a8 01 75 4f 48 8b 43 20 48 89 df <ff> 50 18 85 c0 89 45 cc 75 3e 48 8b 43 48 f0 ff 40 44 f0 80 4b Jun 16 19:01:49 slurv kernel: [50823.272317] RIP [<ffffffff81129872>] __key_instantiate_and_link+0x52/0xcb
Jun 16 19:01:49 slurv kernel: [50823.272339]  RSP <ffff88061941bd38>
Jun 16 19:01:49 slurv kernel: [50823.279199] ---[ end trace 25122b5e9d0b0c76 ]---

It did take a while this time.
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