On a pre-fc7-test vmware image, I sometimes see this kernel BUG: kernel BUG at arch/i386/kernel/kprobes.c:452! invalid opcode: 0000 [#1] SMP last sysfs file: /module/uhci_hcd/sections/.text Modules linked in: stap_ec0f35607d3d65b494254c869904aa15_693632(U) xt_tcpudp ipt able_nat nf_nat nf_conntrack_ipv4 nf_conntrack nfnetlink ip_tables x_tables hidp [...] EFLAGS: 00010046 (2.6.20-1.2986.fc7 #1) EIP is at trampoline_handler+0xeb/0x137 eax: 00000000 ebx: 00000000 ecx: 00000000 edx: 00000000 esi: de14cac0 edi: c1a31ef8 ebp: c1a31ef0 esp: c1a31ed4 ds: 007b es: 007b fs: 00d8 gs: 0000 ss: 0068 Process migration/0 (pid: 2, ti=c1a31000 task=ed34e030 task.ti=c1a31000) Stack: 00000096 00000000 00000000 00000000 00000000 de14cac0 00000000 cb9dde28 c06161fa 00000000 00000033 de14cc70 de14cac0 00000000 cb9dde28 de14cac0 0000007b 0000007b 000000d8 ffffffff c06161e4 00000060 00000082 c1a31f94 Call Trace: [<c04061ed>] show_trace_log_lvl+0x1a/0x2f [<c040629d>] show_stack_log_lvl+0x9b/0xa3 [<c040645d>] show_registers+0x1b8/0x289 [<c040665b>] die+0x12d/0x242 [<c0615817>] do_trap+0x79/0x91 [<c0406bfe>] do_invalid_op+0x97/0xa1 [<c06155ec>] error_code+0x7c/0x84 [<c06161fa>] kretprobe_trampoline+0x16/0x30 From this information, one cannot tell which kprobe/kretprobe might have been associated with the problem. It would be helpful if any such assertion-type messages also printed out information such as the kprobe* or kretprobe/instance addresses, as those can be mapped back to systemtap modules (with some effort).
(sorry, web browser triggered duplicate bug.)