Hi , Let me rephrase my problem with more details and some history. We are running an application on a system which does NAT'ting and shaping. TC and iptable rules are added and deleted at runtime. A TC rule will be, tc class add dev eth1 parent 1:1 classid 1:5001 htb rate 256kbit ceil 256kbit tc filter add dev eth1 protocol ip parent 1:0 prio 1 u32 match ip src 10.1.1.1 match ip flowid 1:5001 At peak some 700 to 800 such rules will be present. Same rules for the other inteface. Deleting a rule is flush out all the rules and reapply :) ( handler could have been used to delete a particular rule, but we have not yet upgraded ) We had ext3 filesystem installed at he beginning. But regularly the box would go down with a kernel panic. The stack trace when this occured is attached. We then moved to resiserfs filesystem. This time although there was no kernel panic, the box hanged with junk messages printed in all our application logs. The box doesnt even respond on the console. Hard reboot is the only thing we can do. Pls find all the details given below. Any suggestions/solutions are welcome. Regards Jayesh System details : Kernel version : 2.4.23 HTB init, kernel part version 3.13 SCSI Adaptec storage controllers 1 GB RAM lspci ----------- 00:00.0 Host bridge: Intel Corp.: Unknown device 254c (rev 01) 00:02.0 PCI bridge: Intel Corp. e7500 HI_B Virtual PCI-to-PCI Bridge (F0) (rev 01) 00:1d.0 USB Controller: Intel Corp. 82801CA/CAM USB (Hub (rev 02) 00:1e.0 PCI bridge: Intel Corp. 82801BA/CA PCI Bridge (rev 42) 00:1f.0 ISA bridge: Intel Corp. 82801CA ISA Bridge (LPC) (rev 02) 00:1f.1 IDE interface: Intel Corp. 82801CA IDE U100 (rev 02) 00:1f.3 SMBus: Intel Corp. 82801CA/CAM SMBus (rev 02) 01:02.0 VGA compatible controller: ATI Technologies Inc Rage XL (rev 27) 02:1c.0 PIC: Intel Corp. 82870P2 P64H2 I/OxAPIC (rev 04) 02:1d.0 PCI bridge: Intel Corp. 82870P2 P64H2 Hub PCI Bridge (rev 04) 02:1e.0 PIC: Intel Corp. 82870P2 P64H2 I/OxAPIC (rev 04) 02:1f.0 PCI bridge: Intel Corp. 82870P2 P64H2 Hub PCI Bridge (rev 04) 03:01.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08) 03:02.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08) 04:01.0 Ethernet controller: Intel Corp.: Unknown device 100f (rev 01) 04:04.0 SCSI storage controller: Adaptec: Unknown device 801f (rev 03) 04:04.1 SCSI storage controller: Adaptec: Unknown device 801f (rev 03) Ksymoops output with ext3 filesystem ----------------------------- Dec 21 06:57:02 theseus kernel: kernel BUG at checkpoint.c:587! Dec 21 06:57:02 theseus kernel: invalid operand: 0000 Dec 21 06:57:02 theseus kernel: CPU: 0 Dec 21 06:57:02 theseus kernel: EIP: 0010:[<c01662ec>] Not tainted Using defaults from ksymoops -t elf32-i386 -a i386 Dec 21 06:57:02 theseus kernel: EFLAGS: 00010292 Dec 21 06:57:02 theseus kernel: eax: 00000069 ebx: f6c46660 ecx: fffffffe edx: 00000000 Dec 21 06:57:02 theseus kernel: esi: f7ecc660 edi: f6c46660 ebp: e03fdc10 esp: f7de9e1c Dec 21 06:57:02 theseus kernel: ds: 0018 es: 0018 ss: 0018 Dec 21 06:57:02 theseus kernel: Process kjournald (pid: 11, stackpage=f7de9000) Dec 21 06:57:02 theseus kernel: Stack: c0257500 c02558c6 c025583d 0000024b c02558a9 f6c46660 c0166173 f7ecc660 Dec 21 06:57:02 theseus kernel: f6c46660 cd59ce60 e03fdc10 c0165b6f e03fdc10 e03fdc10 c01660fb e03fdc10 Dec 21 06:57:02 theseus kernel: 00000012 f19f0540 f19f0540 f19f0d40 f7ecc660 00000000 f7ecc660 c01643ef Dec 21 06:57:02 theseus kernel: Call Trace: [<c0166173>] [<c0165b6f>] [<c01660fb>] [<c01643ef>] [<c020036c>] Dec 21 06:57:02 theseus kernel: [<c0109cea>] [<c011a94b>] [<c0109e9c>] [<c01142c3>] [<c0166e26>] [<c0166d00>] Dec 21 06:57:02 theseus kernel: [<c0107136>] [<c0166d20>] Dec 21 06:57:02 theseus kernel: Code: 0f 0b 4b 02 3d 58 25 c0 83 c4 14 8b 53 1c 85 d2 74 29 68 a0 >>EIP; c01662ec <__journal_drop_transaction+5c/282> <===== Trace; c0166173 <__journal_remove_checkpoint+53/80> Trace; c0165b6f <__try_to_free_cp_buf+1f/40> Trace; c01660fb <__journal_clean_checkpoint_list+5b/80> Trace; c01643ef <journal_commit_transaction+19f/fd4> Trace; c020036c <net_rx_action+6c/100> Trace; c0109cea <handle_IRQ_event+3a/70> Trace; c011a94b <do_softirq+4b/90> Trace; c0109e9c <do_IRQ+9c/b0> Trace; c01142c3 <schedule+2e3/310> Trace; c0166e26 <kjournald+106/1b0> Trace; c0166d00 <commit_timeout+0/10> Trace; c0107136 <arch_kernel_thread+26/30> Trace; c0166d20 <kjournald+0/1b0> Code; c01662ec <__journal_drop_transaction+5c/282> 00000000 <_EIP>: Code; c01662ec <__journal_drop_transaction+5c/282> <===== 0: 0f 0b ud2a <===== Code; c01662ee <__journal_drop_transaction+5e/282> 2: 4b dec %ebx Code; c01662ef <__journal_drop_transaction+5f/282> 3: 02 3d 58 25 c0 83 add 0x83c02558,%bh Code; c01662f5 <__journal_drop_transaction+65/282> 9: c4 14 8b les (%ebx,%ecx,4),%edx Code; c01662f8 <__journal_drop_transaction+68/282> c: 53 push %ebx Code; c01662f9 <__journal_drop_transaction+69/282> d: 1c 85 sbb $0x85,%al Code; c01662fb <__journal_drop_transaction+6b/282> f: d2 (bad) Code; c01662fc <__journal_drop_transaction+6c/282> 10: 74 29 je 3b <_EIP+0x3b> c0166327 <__journal_drop_transaction+97/282> Code; c01662fe <__journal_drop_transaction+6e/282> 12: 68 a0 00 00 00 push $0xa0 ------------------------------------------------- Still single? 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