login: panic: m_zero: M_READONLY Stopped at db_enter+0xa: popq %rbp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0xa sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x147 sys/kern/subr_prf.c:208 m_free(ffffff006d632b00) at m_free+0x17a sys/kern/uipc_mbuf.c:1267 m_freem(ffffffff) at m_freem+0x2d sys/kern/uipc_mbuf.c:525 vio_txeof(ffff800000173290) at vio_txeof+0x104 sys/dev/pv/if_vio.c:1140 vio_tx_intr(ffff800000173110) at vio_tx_intr+0x25 sys/dev/pv/if_vio.c:1116 intr_handler(0,ffff80000064d280) at intr_handler+0x6b sys/arch/amd64/amd64/intr.c:529 Xintr_ioapic_edge20_untramp(0,0,1388,0,ffff800000022a00,ffff800000022a00) at Xintr_ioapic_edge20_untramp+0x19f acpicpu_idle() at acpicpu_idle+0x251 sys/dev/acpi/acpicpu.c:1187 sched_idle(0) at sched_idle+0x374 sys/kern/kern_sched.c:177 end trace frame: 0x0, count: 5 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{0}> ddb{0}> set $lines = 0 ddb{0}> show panic m_zero: M_READONLY ddb{0}> trace db_enter() at db_enter+0xa sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x147 sys/kern/subr_prf.c:208 m_free(ffffff006d632b00) at m_free+0x17a sys/kern/uipc_mbuf.c:1267 m_freem(ffffffff) at m_freem+0x2d sys/kern/uipc_mbuf.c:525 vio_txeof(ffff800000173290) at vio_txeof+0x104 sys/dev/pv/if_vio.c:1140 vio_tx_intr(ffff800000173110) at vio_tx_intr+0x25 sys/dev/pv/if_vio.c:1116 intr_handler(0,ffff80000064d280) at intr_handler+0x6b sys/arch/amd64/amd64/intr.c:529 Xintr_ioapic_edge20_untramp(0,0,1388,0,ffff800000022a00,ffff800000022a00) at Xintr_ioapic_edge20_untramp+0x19f acpicpu_idle() at acpicpu_idle+0x251 sys/dev/acpi/acpicpu.c:1187 sched_idle(0) at sched_idle+0x374 sys/kern/kern_sched.c:177 end trace frame: 0x0, count: -10 ddb{0}> show registers rdi 0xffffffff81e323f0 kprintf_mutex rsi 0x5 rbp 0xffff8000210391e0 rbx 0xffff800021039280 rdx 0x3fd rcx 0 rax 0x1 r8 0xffff8000210391b0 r9 0 r10 0 r11 0xffffff006ee56c70 r12 0x3000000008 r13 0xffff8000210391f0 r14 0x100 r15 0xffffffff81bed177 apollo_pio_rec+0x6e0d rip 0xffffffff811b599a db_enter+0xa cs 0x8 rflags 0x202 rsp 0xffff8000210391e0 ss 0x10 db_enter+0xa: popq %rbp ddb{0}> show proc PROC (idle0) pid=363638 stat=onproc flags process=14000 proc=40000200 pri=0, usrpri=60, nice=20 forw=0x9647fc485d43f271, list=0xffff8000210319c8,0xffff8000210312d0 process=0xffff800021032fc8 user=0xffff800021034000, vmspace=0xffffffff81ee0e58 estcpu=10, cpticks=42, pctcpu=15.84 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 35409 225926 1297 0 3 0x82 nanosleep syz-executor3385 1297 216120 38812 0 3 0x10008a pause ksh 38812 113021 60312 0 3 0x92 select sshd 80119 439021 1 0 3 0x100083 ttyin getty 60312 78105 1 0 3 0x80 select sshd 93729 240715 80566 73 3 0x100090 kqread syslogd 80566 355707 1 0 3 0x100082 netio syslogd 56552 309071 1 77 3 0x100090 poll dhclient 21394 165464 1 0 3 0x80 poll dhclient 54833 506270 0 0 3 0x14200 pgzero zerothread 17091 299971 0 0 3 0x14200 aiodoned aiodoned 48397 461218 0 0 3 0x14200 syncer update 19301 82229 0 0 3 0x14200 cleaner cleaner 10792 188620 0 0 3 0x14200 reaper reaper 80033 162513 0 0 3 0x14200 pgdaemon pagedaemon 75501 468094 0 0 3 0x14200 bored crynlk 35533 423539 0 0 3 0x14200 bored crypto 75201 268160 0 0 3 0x40014200 acpi0 acpi0 67561 284554 0 0 7 0x40014200 idle1 47483 80162 0 0 3 0x14200 bored softnet 82786 148819 0 0 3 0x14200 bored systqmp 41914 105710 0 0 3 0x14200 bored systq 26025 275892 0 0 3 0x40014200 bored softclock *83616 363638 0 0 7 0x40014200 idle0 1 202268 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}>