Re: sysfs: duplicate filename '74' can not be created

[Holger Kiehl]

On Tue, 4 Mar 2008, Alexey Dobriyan wrote:

> [Cc'ing /sys/kernel/uids guys]
>
> > Mar  3 13:50:01 helena kernel: sysfs: duplicate filename '74' can not be created
> > Mar  3 13:50:01 helena kernel: WARNING: at fs/sysfs/dir.c:424 sysfs_add_one()
> > Mar  3 13:50:01 helena kernel: Pid: 21911, comm: sshd Not tainted 2.6.24.3 #1
>
> I see only one suspicious place: KOBJ_ADD is sent even if sysfs file
> creation failed and kobject is happily removed. But this almost
> certainly separate bug.
>
>
>
> You can try this debugging patch. Post several first consecutive messages.
> [crosses fingers]
Applied the patch and this time it oopsed immediatly. I just got one:

   Mar  7 07:09:04 helena kernel: general protection fault: 0000 [1] SMP
   Mar  7 07:09:04 helena kernel: CPU 3
   Mar  7 07:09:04 helena kernel: Modules linked in: lm85 hwmon_vid i2c_amd756_s4882 bonding nf_conntrack_ftp nf_conntrack_netbios_ns ipt_REJECT nf_conntrack_ipv4 xt_state nf_conntrack xt_tcpudp iptable_filter ip_tables x_tables binfmt_misc video output ac floppy nvram ohci_hcd k8temp i2c_amd756 i2c_core button usbcore
   Mar  7 07:09:04 helena kernel: Pid: 2983, comm: modprobe Not tainted 2.6.24.3-alexey #3
   Mar  7 07:09:04 helena kernel: RIP: 0010:[<ffffffff8027931d>]  [<ffffffff8027931d>] __kmalloc_node+0x95/0xc9
   Mar  7 07:09:04 helena kernel: RSP: 0018:ffff81017d571de8  EFLAGS: 00010046
   Mar  7 07:09:04 helena kernel: RAX: 0000000000000000 RBX: 00000000000080d0 RCX: ffffffff8026d2b1
   Mar  7 07:09:04 helena kernel: RDX: ffff007265776f70 RSI: 00000000000080d0 RDI: ffffffff80554e38
   Mar  7 07:09:04 helena kernel: RBP: ffff810200026800 R08: 00000000005184b0 R09: ffffffff80554e38
   Mar  7 07:09:04 helena kernel: R10: 0000000000000000 R11: 0000000000000002 R12: 0000000000000286
   Mar  7 07:09:04 helena kernel: R13: 00000000ffffffff R14: 00000000ffffffff R15: 00000000005184b0
   Mar  7 07:09:04 helena kernel: FS:  00002b66d114c6f0(0000) GS:ffff81027e30e300(0000) knlGS:0000000000000000
   Mar  7 07:09:04 helena kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
   Mar  7 07:09:04 helena kernel: CR2: 0000003254acc030 CR3: 000000017d530000 CR4: 00000000000006e0
   Mar  7 07:09:04 helena kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
   Mar  7 07:09:04 helena kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
   Mar  7 07:09:04 helena kernel: Process modprobe (pid: 2983, threadinfo ffff81017d570000, task ffff81017df3d5c0)
   Mar  7 07:09:04 helena kernel: Stack:  ffff81027d2fb740 ffffc200017e39a8 ffff81027d2fba00 00000000000000d0
   Mar  7 07:09:04 helena kernel:  ffffc200017e33e8 ffffffff8026d2b1 0000000000000163 ffffc200017e39a8
   Mar  7 07:09:04 helena kernel:  0000000000000018 ffffc200017e39a8 0000000000000018 ffffc200017e2f80
   Mar  7 07:09:04 helena kernel: Call Trace:
   Mar  7 07:09:04 helena kernel:  [<ffffffff8026d2b1>] __vmalloc_area_node+0x71/0x185
   Mar  7 07:09:04 helena kernel:  [<ffffffff80248ec0>] sys_init_module+0x94d/0x1872
   Mar  7 07:09:04 helena kernel:  [<ffffffff8020b61e>] system_call+0x7e/0x83
   Mar  7 07:09:04 helena kernel:
   Mar  7 07:09:04 helena kernel:
   Mar  7 07:09:04 helena kernel: Code: 48 8b 04 c2 48 89 45 00 41 54 9d 31 c0 c1 eb 0f 48 85 d2 0f
   Mar  7 07:09:04 helena kernel: RIP  [<ffffffff8027931d>] __kmalloc_node+0x95/0xc9
   Mar  7 07:09:04 helena kernel:  RSP <ffff81017d571de8>
   Mar  7 07:09:04 helena kernel: ---[ end trace 82b7eaeeb11c3ab5 ]---

After this the system was no longer reachable. Note, as before it always
happens on CPU3.

Holger

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