Red Hat Bugzilla – Bug 419911
Kernel crashes under heavy samba load
Last modified: 2009-01-09 00:29:08 EST
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Description of problem:
Under heavy load the samba daemon will trigger a crash in the kernel:
Dec 11 15:36:10 localhost kernel: ------------[ cut here ]------------
Dec 11 15:36:10 localhost kernel: kernel BUG at fs/dcache.c:986!
Dec 11 15:36:10 localhost kernel: invalid opcode: 0000 [#3] SMP
Dec 11 15:36:10 localhost kernel: Modules linked in: rfcomm l2cap bluetooth auto
fs4 coretemp hwmon sunrpc nf_conntrack_ipv4 ipt_REJECT iptable_filter ip_tables
nf_conntrack_ipv6 xt_state nf_conntrack nfnetlink xt_tcpudp ip6t_ipv6header ip6t
_REJECT ip6table_filter ip6_tables x_tables loop dm_multipath ipv6 snd_hda_intel
snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss
snd_mixer_oss snd_pcm firewire_ohci snd_timer firewire_core serio_raw i2c_i801
snd_page_alloc snd_hwdep button e1000e nvidia(P)(U) iTCO_wdt snd pcspkr crc_itu_
t iTCO_vendor_support soundcore i2c_core sr_mod sg cdrom pata_marvell dm_snapsho
t dm_zero dm_mirror dm_mod ata_generic ata_piix sata_sil libata sd_mod scsi_mod
ext3 jbd mbcache uhci_hcd ohci_hcd ehci_hcd
Dec 11 15:36:10 localhost kernel: CPU: 3
Dec 11 15:36:10 localhost kernel: EIP: 0060:[<c048fd70>] Tainted: P D
Dec 11 15:36:10 localhost kernel: EFLAGS: 00010287 (18.104.22.168-63.fc8 #1)
Dec 11 15:36:10 localhost kernel: EIP is at d_instantiate+0xf/0x60
Dec 11 15:36:10 localhost kernel: eax: f4876cc0 ebx: f6244628 ecx: f5d3ac68
Dec 11 15:36:10 localhost kernel: esi: f4876cc0 edi: f4876d00 ebp: 00000005
Dec 11 15:36:10 localhost kernel: ds: 007b es: 007b fs: 00d8 gs: 0033 ss:
Dec 11 15:36:10 localhost kernel: Process smbd (pid: 2840, ti=f61ea000 task=f7e6
Dec 11 15:36:10 localhost kernel: Stack: f6ebd3c0 f6244600 f6244628 c05b2079 000
00000 00000000 c06b5c2d 00000000
Dec 11 15:36:10 localhost kernel: f6244600 f6092c00 c05b343a c0480ece 000
00000 00000000 f7ff4198 f5c31840
Dec 11 15:36:10 localhost kernel: 00000000 00000001 ffffffff f621de40 000
00000 00000000 00000000 00000000
Dec 11 15:36:10 localhost kernel: Call Trace:
Dec 11 15:36:10 localhost kernel: [<c05b2079>] sock_attach_fd+0x53/0xb2
Dec 11 15:36:10 localhost kernel: [<c05b343a>] sys_accept+0xae/0x1d1
Dec 11 15:36:10 localhost kernel: [<c0480ece>] do_sync_read+0xc7/0x10a
Dec 11 15:36:10 localhost kernel: [<c043d495>] autoremove_wake_function+0x0/0x3
Dec 11 15:36:10 localhost kernel: [<c043d638>] remove_wait_queue+0x16/0x22
Dec 11 15:36:10 localhost kernel: [<c05b3633>] sys_socketcall+0xd6/0x261
Dec 11 15:36:10 localhost kernel: [<c040518a>] syscall_call+0x7/0xb
Dec 11 15:36:10 localhost kernel: =======================
Dec 11 15:36:10 localhost kernel: Code: 40 88 06 00 89 ea 89 d8 89 6b 0c e8 5f 4
5 01 00 31 f6 83 c4 0c 89 f0 5b 5e 5f 5d c3 57 56 89 c6 53 89 d3 8d 78 40 39 78
40 74 04 <0f> 0b eb fe b8 80 68 73 c0 e8 d0 ee 18 00 85 db 74 0a 8d 53 18
Dec 11 15:36:10 localhost kernel: EIP: [<c048fd70>] d_instantiate+0xf/0x60 SS:ES
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Mount your home directory via samba on a WinXP machine, call it (say) Z:
2. Do something that really exercises the disk (in my case, compiling a very large project with Visual Studio on Z:)
3. Watch the fireworks.
Eventually (usually within 5 minutes), the build will fail, the kernel will crash, and a reboot is necessary.
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