try list *(0x[address]) . That line is mtx_unlock(), which makes no sense (as mtx_lock succeeded fine.) -a On 5 January 2016 at 18:13, Shawn Webb <shawn.webb_at_hardenedbsd.org> wrote: > Thanks for the quick reply! Here's some more debugging output: > > === Begin Log === > (kgdb) bt > #0 doadump (textdump=0) at pcpu.h:221 > #1 0xffffffff8037c78b in db_dump (dummy=<value optimized out>, dummy2=false, dummy3=0, dummy4=0x0) at /usr/src/sys/ddb/db_command.c:533 > #2 0xffffffff8037c57e in db_command (cmd_table=0x0) at /usr/src/sys/ddb/db_command.c:440 > #3 0xffffffff8037c314 in db_command_loop () at /usr/src/sys/ddb/db_command.c:493 > #4 0xffffffff8037edab in db_trap (type=<value optimized out>, code=0) at /usr/src/sys/ddb/db_main.c:251 > #5 0xffffffff80a5c563 in kdb_trap (type=12, code=0, tf=<value optimized out>) at /usr/src/sys/kern/subr_kdb.c:654 > #6 0xffffffff80e6b7e1 in trap_fatal (frame=0xfffffe02c33894d0, eva=<value optimized out>) at /usr/src/sys/amd64/amd64/trap.c:829 > #7 0xffffffff80e6ba2d in trap_pfault (frame=0xfffffe02c33894d0, usermode=<value optimized out>) at /usr/src/sys/amd64/amd64/trap.c:684 > #8 0xffffffff80e6b15f in trap (frame=0xfffffe02c33894d0) at /usr/src/sys/amd64/amd64/trap.c:435 > #9 0xffffffff80e4af97 in calltrap () at /usr/src/sys/amd64/amd64/exception.S:234 > #10 0xffffffff80b5de9e in ip_fillid (ip=0xfffff8000ef8cb88) at /usr/src/sys/netinet/ip_id.c:237 > #11 0xffffffff80b6c41b in ip_output (m=<value optimized out>, opt=<value optimized out>, ro=<value optimized out>, flags=0, imo=0x0, inp=0xfffff8000e66e960) at /usr/src/sys/netinet/ip_output.c:268 > #12 0xffffffff80bf0612 in udp_send (so=<value optimized out>, flags=<value optimized out>, m=<value optimized out>, addr=0x0, control=<value optimized out>, td=0xfffff8000ef8cb88) at /usr/src/sys/netinet/udp_usrreq.c:1517 > #13 0xffffffff80aa3872 in sosend_dgram (so=0xfffff8000e6422e8, addr=0x0, uio=<value optimized out>, top=0xfffff8000ef8cb00, control=0x0, flags=<value optimized out>, td=0xffffffff81bef2ec) at /usr/src/sys/kern/uipc_socket.c:1164 > #13 0xffffffff80aa3872 in sosend_dgram (so=0xfffff8000e6422e8, addr=0x0, uio=<value optimized out>, top=0xfffff8000ef8cb00, control=0x0, flags=<value optimized out>, td=0xffffffff81bef2ec) at /usr/src/sys/kern/uipc_socket.c:1164 > #14 0xffffffff80aaa03b in kern_sendit (td=0xfffff8000e4cd9c0, s=6, mp=<value optimized out>, flags=0, control=0x0, segflg=UIO_USERSPACE) at /usr/src/sys/kern/uipc_syscalls.c:906 > #15 0xffffffff80aaa336 in sendit (td=0xfffff8000e4cd9c0, s=<value optimized out>, mp=0xfffffe02c3389970, flags=3980) at /usr/src/sys/kern/uipc_syscalls.c:833 > #16 0xffffffff80aaa1fd in sys_sendto (td=0x0, uap=<value optimized out>) at /usr/src/sys/kern/uipc_syscalls.c:957 > #17 0xffffffff80e6bfdb in amd64_syscall (td=0xfffff8000e4cd9c0, traced=0) at subr_syscall.c:135 > #18 0xffffffff80e4b27b in Xfast_syscall () at /usr/src/sys/amd64/amd64/exception.S:394 > #19 0x000003e339782e8a in ?? () > (kgdb) x/i 0xffffffff80b5de9e > 0xffffffff80b5de9e <ip_fillid+142>: movzbl (%rax,%rcx,1),%esi > (kgdb) info reg > rax 0x0 0 > rbx 0x0 0 > rcx 0x0 0 > rdx 0x0 0 > rsi 0x0 0 > rdi 0x0 0 > rbp 0xfffffe02c3388fe0 0xfffffe02c3388fe0 > rsp 0xfffffe02c3388fc8 0xfffffe02c3388fc8 > r8 0x0 0 > r9 0x0 0 > r10 0x0 0 > r11 0x0 0 > r12 0xffffffff817c0b80 -2122577024 > r13 0xffffffff817c1470 -2122574736 > r14 0x1 1 > r15 0x4 4 > rip 0xffffffff80a1fae3 0xffffffff80a1fae3 <doadump+51> > eflags 0x0 0 > cs 0x0 0 > ss 0x0 0 > ds 0x0 0 > es 0x0 0 > fs 0x0 0 > gs 0x0 0 > === End Log === > > Thanks, > > Shawn > > On Tue, Jan 05, 2016 at 06:06:41PM -0800, Adrian Chadd wrote: >> looks like a null pointer deference. What's kgdb show at that IP? >> >> >> -a >> >> >> On 5 January 2016 at 17:57, Shawn Webb <shawn.webb_at_hardenedbsd.org> wrote: >> > Hey All, >> > >> > Here's a kernel panic I'm experiencing by enabling net.inet.ip.random_id >> > at boot. >> > >> > I'm on latest HEAD on amd64 in bhyve. I'll soon-ish be testing on native >> > hardware with VIMAGE enabled. >> > >> > === Begin Log === >> > Kernel page fault with the following non-sleepable locks held: >> > exclusive sleep mutex ip_id_mtx (ip_id_mtx) r = 0 (0xffffffff81c54830) locked _at_ /usr/src/sys/netinet/ip_id.c:227 >> > stack backtrace: >> > #0 0xffffffff80a79620 at witness_debugger+0x70 >> > #1 0xffffffff80a7a937 at witness_warn+0x3d7 >> > #2 0xffffffff80e6b887 at trap_pfault+0x57 >> > #3 0xffffffff80e6b15f at trap+0x4bf >> > #4 0xffffffff80e4af97 at calltrap+0x8 >> > #5 0xffffffff80b6c41b at ip_output+0x16b >> > #6 0xffffffff80b68e82 at icmp_reflect+0x5b2 >> > #7 0xffffffff80b6883f at icmp_error+0x46f >> > #8 0xffffffff80beeb12 at udp_input+0x982 >> > #9 0xffffffff80b69d1d at ip_input+0x17d >> > #10 0xffffffff80b08ba1 at netisr_dispatch_src+0x81 >> > #11 0xffffffff80afecce at ether_demux+0x15e >> > #12 0xffffffff80affa14 at ether_nh_input+0x344 >> > #13 0xffffffff80b08ba1 at netisr_dispatch_src+0x81 >> > #14 0xffffffff80afefcf at ether_input+0x4f >> > #15 0xffffffff8089a5c3 at vtnet_rxq_eof+0x823 >> > #16 0xffffffff8089b2ce at vtnet_rx_vq_intr+0x4e >> > #17 0xffffffff809e9ba6 at intr_event_execute_handlers+0x96 >> > >> > >> > Fatal trap 12: page fault while in kernel mode >> > cpuid = 6; apic id = 06 >> > fault virtual address = 0x5bd >> > fault code = supervisor read data, page not present >> > instruction pointer = 0x20:0xffffffff80b5de9e >> > stack pointer = 0x28:0xfffffe02b8d483e0 >> > frame pointer = 0x28:0xfffffe02b8d48410 >> > code segment = base 0x0, limit 0xfffff, type 0x1b >> > = DPL 0, pres 1, long 1, def32 0, gran 1 >> > processor eflags = interrupt enabled, resume, IOPL = 0 >> > current process = 12 (irq265: virtio_pci0) >> > [ thread pid 12 tid 100040 ] >> > Stopped at ip_fillid+0x8e: movzbl (%rax,%rcx,1),%esi >> > === End Log === >> > >> > Thanks, >> > >> > -- >> > Shawn Webb >> > HardenedBSD >> > >> > GPG Key ID: 0x6A84658F52456EEE >> > GPG Key Fingerprint: 2ABA B6BD EF6A F486 BE89 3D9E 6A84 658F 5245 6EEE > > -- > Shawn Webb > HardenedBSD > > GPG Key ID: 0x6A84658F52456EEE > GPG Key Fingerprint: 2ABA B6BD EF6A F486 BE89 3D9E 6A84 658F 5245 6EEEReceived on Wed Jan 06 2016 - 01:22:35 UTC
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