Date: Sun, 29 Dec 2019 13:53:42 -0800 From: Mark Millard <marklmi@yahoo.com> To: FreeBSD Current <freebsd-current@freebsd.org>, freebsd-hackers@freebsd.org, FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: head -r356109 on 32-bit powerpc (old PowerMac): Memory modified after free during late-stage of boot, most recently used by bus-sc Message-ID: <28FD8632-AC91-40D7-B6E7-36E304D37794@yahoo.com> References: <28FD8632-AC91-40D7-B6E7-36E304D37794.ref@yahoo.com>
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The kernel here is from expanding: = https://artifact.ci.freebsd.org/snapshot/head/r356109/powerpc/powerpc/kern= el*.txz (So: not my kernel build.) This is, of course, a debug kernel. World is my build (via system-clang, not gcc 4.2.1) Hand copied from an image of the crash information (no input possible at the db> prompt) . . . . . . Root mount waiting for: CAM usbus0 usbus1 ugen1.2: <Mitsumi Electric Hub in Apple Extended USB Keyboard> at usbus1 uhub4 on uhub0 uhub4: <Mitsumi Electric Hub in Apple Extended USB Keyboard, class 9/0, = rev 1.10/1.22, addr 2> on ubus1 Memory modified after free 0x1e4d180(28) val=3D1e5a9c0 0 0x1e4d190 panic: Most recently used by bus-sc cpuid =3D 0 time =3D 2 KDB: stack backtrace: 0xd2630390: at kdb_backtrace+0x5c 0xd2630400: at vpanic+0x1f8 0xd2630470: at panic+0x68 0xd26304c0: at mtrash_ctor+0x9c 0xd26304e0: at item_ctor+0xb4 0xd2630510: at uma_zalloc_arg+0x1b4 0xd2630540: at malloc+0xfc 0xd2630580: at alloc_bounce_pages+0x7c 0xd26305c0: at bus_dmamap_create+0x1e8 0xd26305f0: at bus_dmamem_alloc+0x64 0xd2630620: at usb_pc_alloc_mem+0xbc 0xd2630660: at usbd_transfer_setup_sub_malloc+0x28c 0xd26306c0: at ohci_xfer_setup+0x1e4 0xd2630720: at usbd_trasnfer_setup+0x494 0xd26307a0: at usbd_ctrl_trasnfer_setup+0x184 0xd26307f0: at usbd_do_request_flags+0x300 0xd2630870: at usbd_req_set_address+0xdc 0xd26308b0: at usb_alloc_device+0x3cc 0xd2630940: at uhub_explore+0x678 0xd26309b0: at usb_bus_explore+0x128 0xd26309d0: at usb_process+0x128 0xd2630a10: at fork_exit+0xc0 0xd2630a40: at fork_trampoline+0xc KDB: enter: panic [ thread pid 15 tid 100040 ] Stopped at kdb_enter +0x70: addi r0,r0,0x0 db>=20 Unfortunately, I have no control at that point so this is all the information available about the PowerMac's state. I can report the that following sequences do boot (so far): boot -s then exit at the shell prompt boot -v (I've also seen a Rock64 Cortex-A53 board with boot crashes, where boot -v happened to boot, but only a personal non-debug kernel build was tried at the time.) The PowerMac is a 2-processor G4 model, with FW800. 2 GiBytes of RAM. Note: Historically I've experimented with system-clang and more modern gcc builds for 32-bit powerpc and powerpc64. The above is from me getting ready to jump over to the official system-clang context (and ELFv2 for powerpc64). I wanted to know some of the status of things that I'd see just before those changes so I'd have some clue what might be new vs. old when I switch over. =3D=3D=3D Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)
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