root@talos:~ # sysctl debug.kdb.enter=1 debug.kdb.enter: 0KDB: enter: sysctl debug.kdb.enter [ thread pid 987 tid 100402 ] Stopped at 0xc0000000029a9938 = .kdb_enter+0x60: ld r2, r1, 0x28 db> trace Tracing pid 987 tid 100402 td 0xc0000000135f0000 0xe000000171518110: at 0xc0000000029a9a58 = .kdb_break+0xec 0xe0000001715181b0: at 0xc00000000295a3a0 = .sysctl_ctx_entry_add+0x1d4 0xe000000171518260: at 0xc00000000295a718 = .sysctl_ctx_entry_add+0x54c 0xe000000171518350: at 0xc00000000295c758 = .userland_sysctl+0x1c0 0xe000000171518470: at 0xc00000000295c93c = .sys___sysctl+0x8c 0xe000000171518590: at 0xc000000002d13dc4 = .trap+0x6e0 0xe000000171518760: at 0xc000000002d07be0 = .powerpc_interrupt+0x220 0xe000000171518810: user SC trap by 0x81026be98: srr1=0x900000000000f032 r1=0x3fffffffffffc710 cr=0x24000042 xer=0x20040000 ctr=0x81026be90 r2=0x8102c6e38 db> step [ thread pid 987 tid 100402 ] Stopped at 0xc0000000029a993c = .kdb_enter+0x64: addi r0, r0, 0x0 db> step [ thread pid 987 tid 100402 ] Stopped at 0xc0000000029a9940 = .kdb_enter+0x68: std r0, r29, 0x0 db> next After 7 instructions (0 loads, 0 stores), [ thread pid 987 tid 100402 ] Stopped at 0xc0000000029a995c = .kdb_enter+0x84: blr db> show registers r0 0xc0000000029a9a5c .kdb_break+0xf0 r1 0xe000000171518110 r2 0xc00000000371cba0 r3 0xc000000003a4f480 r4 0x80 r5 0xc0000000032c5168 r6 0x178 r7 0xc0000000032c5920 r8 0xc0000000032bd308 r9 0xc0000000039c03f8 msgbuftrigger r10 0 r11 0 r12 0x2000f038 r13 0xc0000000135f0000 r14 0x3fffffffffffc8f2 r15 0x3fffffffffffc8e4 r16 0x3fffffffffffc898 r17 0x3fffffffffffc890 r18 0x3fffffffffffc8d0 r19 0x100047d8 r20 0x810045008 r21 0 r22 0xe0000001715184f8 r23 0x3 r24 0xc0000000135f0000 r25 0x4 r26 0xe0000001715183c0 r27 0 r28 0xc0000000035d1c18 sdt_provider_io+0x3b8 r29 0xe0000001715183c0 r30 0 r31 0xe000000171518110 srr0 0xc0000000029a995c .kdb_enter+0x84 srr1 0x9000000050009032 lr 0xc0000000029a9a5c .kdb_break+0xf0 ctr 0 cr 0x4000f032 xer 0x20040000 dar 0 dsisr 0 0xc0000000029a995c = .kdb_enter+0x84: blr db> continue -> 0 root@talos:~ #