login: kernel: protection fault trap, code=0 Stopped at m_extfree+0x3d: movq %rax,0x90(%r15) ddb> ddb> set $lines = 0 ddb> show panic the kernel did not panic ddb> trace m_extfree(b60f1371fdce2edc) at m_extfree+0x3d m_free(ffffff006d8d0400) at m_free+0xee m_freem(16) at m_freem+0x2d soreceive(0,ffffff006e6fe908,0,0,ffff800021100358,ffff800021100260) at soreceive+0x1131 recvit(ffff8000210c2bc8,ffff8000211003f0,0,ffff800021100408,7f7ffffd9808) at recvit+0x28c sys_recvfrom(ffff800021100490,ffff8000210c2bc8,ffff8000210a6950) at sys_recvfrom+0xbc syscall(0) at syscall+0x3e4 Xsyscall(6,0,0,0,0,7f7ffffd9834) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd9820, count: -8 ddb> show registers rdi 0x7 rsi 0x42 rbp 0xffff800021100150 rbx 0 rdx 0xffffffffffffbeef rcx 0xffffffff81e8e3b0 mbstat_boot_boot_cpumem rax 0x6a49e2587484c264 r8 0 r9 0xffff8000210c2bc8 r10 0xb60f1371fdce2edc r11 0xffffffff816a34a0 pool_lock_mtx_leave r12 0xdead __ALIGN_SIZE+0xcead r13 0xffffff006e6fe908 r14 0xffffff006d8d0400 r15 0xe7e82a506252ad88 rip 0xffffffff81adbf1d m_extfree+0x3d cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800021100140 ss 0x10 m_extfree+0x3d: movq %rax,0x90(%r15) ddb> show proc PROC (syz-executor7847) pid=214195 stat=onproc flags process=0 proc=0 pri=50, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff8000210c32d0,0xffffffff81eafaa0 process=0xffff8000210a6950 user=0xffff8000210fb000, vmspace=0xffffff007f12b318 estcpu=0, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND *23616 214195 85959 0 7 0 syz-executor7847 85959 133058 7891 0 3 0x82 nanosleep syz-executor7847 7891 297937 25118 0 3 0x10008a pause ksh 25118 322355 96339 0 3 0x92 select sshd 98869 278133 1 0 3 0x100083 ttyin getty 96339 283043 1 0 3 0x80 select sshd 61753 207919 77749 73 3 0x100090 kqread syslogd 77749 221996 1 0 3 0x100082 netio syslogd 5676 173539 1 77 3 0x100090 poll dhclient 21942 300132 1 0 3 0x80 poll dhclient 72732 184730 0 0 2 0x14200 zerothread 28192 21883 0 0 3 0x14200 aiodoned aiodoned 4643 439851 0 0 3 0x14200 syncer update 1847 434211 0 0 3 0x14200 cleaner cleaner 26456 124248 0 0 3 0x14200 reaper reaper 47747 252356 0 0 3 0x14200 pgdaemon pagedaemon 99422 99833 0 0 3 0x14200 bored crynlk 92071 464473 0 0 3 0x14200 bored crypto 78152 509907 0 0 3 0x40014200 acpi0 acpi0 34224 306843 0 0 3 0x14200 bored softnet 57734 418729 0 0 3 0x14200 bored systqmp 82381 334222 0 0 3 0x14200 bored systq 22446 378562 0 0 3 0x40014200 bored softclock 36611 429526 0 0 3 0x40014200 idle0 1 349270 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb>