Hi, According to dmesg, I encountered a kernel bug on my system. This occured on a Fedora kernel. Maybe its a general problem? kernel BUG at lib/list_debug.c:27! invalid opcode: 0000 [2] SMP =========================================== = What was I doing when this happened. ========================================== I was doing a rm -rf /media/somedir/ command on a USB harddisk. This USB harddisk casing contained a flaky IDE harddisk. (smartd had been giving warnings about this drive for a while, that it was about to break doing. What happened. The rm stuck, (couldn't be killed, even with a kill -9 command). dmesg showed a kernel bug. =================================== = Version ==================================== Fedora core 7. [harm@localhost ~]# uname -a Linux localhost.localdomain 2.6.22.1-41.fc7 #1 SMP Fri Jul 27 18:21:43 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux [harm@localhost scripts]$ ./ver_linux If some fields are empty or look unusual you may have an old version. Compare to the current minimal requirements in Documentation/Changes. Linux localhost.localdomain 2.6.22.1-41.fc7 #1 SMP Fri Jul 27 18:21:43 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux Gnu C 4.1.2 Gnu make 3.81 binutils 2.17.50.0.12-4 util-linux 2.13-pre7 mount 2.13-pre7 module-init-tools 3.3-pre11 e2fsprogs 1.39 pcmciautils 014 quota-tools 3.14. PPP 2.4.4 Linux C Library > libc.2.6 Dynamic linker (ldd) 2.6 Procps 3.2.7 Net-tools 1.60 Kbd 1.12 oprofile 0.9.2 Sh-utils 6.9 udev 113 wireless-tools 28 Modules Loaded loop ppdev tun nls_utf8 autofs4 hidp rfcomm l2cap bluetooth sunrpc nf_conntrack_netbios_ns nf_conntrack_ipv4 xt_state nf_conntrack nfnetlink xt_tcpudp ipt_REJECT x_tables cpufreq_ondemand acpi_cpufreq vfat fat dm_mirror dm_multipath dm_mod video sbs button dock battery ac ipv6 sr_mod cdrom parport_pc parport snd_hda_intel snd_seq_dummy via_rhine i2c_viapro snd_seq_oss snd_seq_midi_event snd_seq serio_raw snd_seq_device rtc_cmos snd_pcm_oss mii i2c_core usb_storage snd_mixer_oss floppy pata_via shpchp snd_pcm snd_timer snd soundcore snd_page_alloc sg ahci sata_via ata_generic libata sd_mod scsi_mod ext3 jbd mbcache ehci_hcd ohci_hcd uhci_hcd ================================ = OOPS/kernel output ================================ kernel BUG at lib/list_debug.c:27! invalid opcode: 0000 [2] SMP last sysfs file: /block/sdf/size CPU 1 Modules linked in: loop ppdev tun nls_utf8 autofs4 hidp rfcomm l2cap bluetooth sunrpc nf_conntrack_netbios_ns nf_conntrack_ipv4 xt_state nf_conntrack nfnetlink xt_tcpudp ipt_REJECT x_tables cpufreq_ondemand acpi_cpufreq vfat fat dm_mirror dm_multipath dm_mod video sbs button dock battery ac ipv6 sr_mod cdrom parport_pc parport snd_hda_intel snd_seq_dummy via_rhine i2c_viapro snd_seq_oss snd_seq_midi_event snd_seq serio_raw snd_seq_device rtc_cmos snd_pcm_oss mii i2c_core usb_storage snd_mixer_oss floppy pata_via shpchp snd_pcm snd_timer snd soundcore snd_page_alloc sg ahci sata_via ata_generic libata sd_mod scsi_mod ext3 jbd mbcache ehci_hcd ohci_hcd uhci_hcd Pid: 11136, comm: rm Not tainted 2.6.22.1-41.fc7 #1 RIP: 0010:[<ffffffff81118f7a>] [<ffffffff81118f7a>] __list_add+0x27/0x5b RSP: 0018:ffff810027079de8 EFLAGS: 00010282 RAX: 0000000000000079 RBX: 0000000000000000 RCX: 000000000004f977 RDX: 00000000ffffffff RSI: ffff8100076fd7c8 RDI: 0000000000000000 RBP: ffff81001f9029c8 R08: 0000000000000010 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000000 R12: ffff810018398400 R13: ffff8100076fd7c8 R14: ffff81001f902900 R15: ffff810027079e08 FS: 00002aaaaaae0270(0000) GS:ffff810001591280(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000f183e0 CR3: 0000000011668000 CR4: 00000000000006e0 Process rm (pid: 11136, threadinfo ffff810027078000, task ffff81000b5ff000) Stack: ffff810027079e08 ffffffff8804303e ffff8100076fd7c8 ffff81001f902990 ffff810017fc9888 0000000000000180 0000000000000029 ffffffff8803dc8e ffff8100072d17b8 ffff81001f9029c8 ffff8100076fd7c8 ffff810017ebf9c8 Call Trace: [<ffffffff8804303e>] :ext3:ext3_orphan_add+0x14b/0x187 [<ffffffff8803dc8e>] :ext3:ext3_mark_inode_dirty+0x44/0x4d [<ffffffff88044087>] :ext3:ext3_unlink+0x16e/0x1d5 [<ffffffff8109af23>] vfs_unlink+0xbc/0x102 [<ffffffff8109ce8f>] do_unlinkat+0xaa/0x144 [<ffffffff8109efda>] sys_getdents+0xaf/0xbd [<ffffffff8109e5b2>] sys_fcntl+0x2d7/0x2e3 [<ffffffff81009b5e>] system_call+0x7e/0x83 Code: 0f 0b eb fe 4c 8b 00 49 39 f0 74 18 48 89 c1 4c 89 c2 48 c7 RIP [<ffffffff81118f7a>] __list_add+0x27/0x5b RSP <ffff810027079de8> WARNING: at kernel/exit.c:814 do_exit() (Not tainted) Call Trace: [<ffffffff81035f5e>] do_exit+0x59/0x7db [<ffffffff8100b31a>] kernel_math_error+0x0/0x71 [<ffffffff8100b736>] do_invalid_op+0x85/0x8f [<ffffffff81118f7a>] __list_add+0x27/0x5b [<ffffffff810339b1>] printk+0x52/0xaf [<ffffffff88027bfc>] :jbd:do_get_write_access+0x4c1/0x4f6 [<ffffffff812492fd>] error_exit+0x0/0x84 [<ffffffff81118f7a>] __list_add+0x27/0x5b [<ffffffff81118f7a>] __list_add+0x27/0x5b [<ffffffff8804303e>] :ext3:ext3_orphan_add+0x14b/0x187 [<ffffffff8803dc8e>] :ext3:ext3_mark_inode_dirty+0x44/0x4d [<ffffffff88044087>] :ext3:ext3_unlink+0x16e/0x1d5 [<ffffffff8109af23>] vfs_unlink+0xbc/0x102 [<ffffffff8109ce8f>] do_unlinkat+0xaa/0x144 [<ffffffff8109efda>] sys_getdents+0xaf/0xbd [<ffffffff8109e5b2>] sys_fcntl+0x2d7/0x2e3 [<ffffffff81009b5e>] system_call+0x7e/0x83 =============================================== = CPU =============================================== [root@localhost ~]# cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz stepping : 6 cpu MHz : 1600.000 cache size : 4096 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm bogomips : 4790.92 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz stepping : 6 cpu MHz : 1600.000 cache size : 4096 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr lahf_lm bogomips : 4787.30 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual
might be related to Bug 247975 (dup?). That bug also triggered a BUG at lib/list_debug.c, However.. the stacktrace seems to be different.