On Thu, Sep 08, 2011 at 03:24:20PM -0700, Simon Kirby wrote: > This box primarily does most of its VFS stuff over lots of NFS mounts, > but has some local EXT3 filesystems. This has happened a couple of times: > > BUG: unable to handle kernel NULL pointer dereference at 00000000000000b8 > IP: [<ffffffff816a6641>] mutex_unlock+0x1/0x20 > PGD 12e07e067 PUD 102dfa067 PMD 0 > Oops: 0002 [#1] SMP > CPU 3 > Modules linked in: ipmi_devintf ipmi_si ipmi_msghandler xt_recent nf_conntrack_ftp xt_state xt_owner nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 bnx2 > [445464.657194] > Pid: 13796, comm: php Tainted: G W 3.1.0-rc4-hw+ #27 Dell Inc. PowerEdge 1950/0UR033 > RIP: 0010:[<ffffffff816a6641>] [<ffffffff816a6641>] mutex_unlock+0x1/0x20 > RSP: 0018:ffff8801381c7e58 EFLAGS: 00010206 > RAX: 00000000fffffffe RBX: ffff88002e95aca8 RCX: ffff88010712dc70 > RDX: 0000000040000200 RSI: ffff880126d21cc0 RDI: 00000000000000a0 > RBP: ffff8801381c7e88 R08: 0000000026361000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000002 R12: 00000000fffffffe > R13: ffff880126d21cc0 R14: 00007f0a6e0ba9d8 R15: 00007f0a6e0bd258 > FS: 00007f0a6e1c1720(0000) GS:ffff88022fcc0000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000000000b8 CR3: 000000012692a000 CR4: 00000000000006e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > Process php (pid: 13796, threadinfo ffff8801381c6000, task ffff88003ed4d900) > Stack: > ffff8801381c7e88 ffffffff8110e680 ffff8801381c7e98 ffff880126d21cc0 > ffff8801381c7e98 0000000000000000 ffff8801381c7f68 ffffffff8110e7a6 > ffff880225eed800 ffff8800bea6d780 00000004018245d5 ffff88003ed0b03b > Call Trace: > [<ffffffff8110e680>] ? vfs_rmdir+0xb0/0x100 > [<ffffffff8110e7a6>] do_rmdir+0xd6/0x130 > [<ffffffff811049c1>] ? sys_newlstat+0x31/0x50 > [<ffffffff8110e851>] sys_rmdir+0x11/0x20 > [<ffffffff816af57b>] system_call_fastpath+0x16/0x1b > Code: 0f 79 05 e8 d2 00 00 00 65 48 8b 04 25 c0 b5 00 00 48 8b 1c 24 49 89 44 24 18 4c 8b 64 24 08 c9 c3 66 0f 1f 84 00 00 00 00 00 55 > c7 47 18 00 00 00 00 48 89 e5 f0 ff 07 7f 05 e8 4a 00 00 00 > RIP [<ffffffff816a6641>] mutex_unlock+0x1/0x20 > RSP <ffff8801381c7e58> > CR2: 00000000000000b8 > ---[ end trace 3ad1ff5004f78cbb ]--- > > I don't see any relevant changes in Linus HEAD yet. This build was of > 9e79e3e9dd9672b37ac9412e9a926714306551fe (slightly past 3.1-rc4). Got a few more identical Oopses on another box running slightly past 3.1-rc5 (79016f648872549392d232cd648bd02298c2d2bb). It seems to be do_rmdir()'s mutex_unlock() call. I'm building -rc6 with CONFIG_DEBUG_MUTEXES now. Simon- -- 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
