panic: tcp_output Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *230754 56502 0 0x2 0 0 syz-executor3948932174 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257866e) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000bd7200) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806dd8a3e8,fffffd806ef24700,0,fffffd807f00b500) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd806dd8a3e8,0,ffff8000212d4660,0,fffffd807f00b500,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806dd8a3e8,0,ffff8000212d4660,0,fffffd807f00b500,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800021232548,4,ffff8000212d47e0,0,ffff8000212d48d0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800021232548,ffff8000212d4888,ffff8000212d48d0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff8000212d4950) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff8000212d4950) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc2620, count: 6 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}> set $maxwidth = 0 ddb{0}> show panic *cpu0: tcp_output ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257866e) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000bd7200) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806dd8a3e8,fffffd806ef24700,0,fffffd807f00b500) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd806dd8a3e8,0,ffff8000212d4660,0,fffffd807f00b500,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806dd8a3e8,0,ffff8000212d4660,0,fffffd807f00b500,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800021232548,4,ffff8000212d47e0,0,ffff8000212d48d0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800021232548,ffff8000212d4888,ffff8000212d48d0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff8000212d4950) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff8000212d4950) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc2620, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000212d42c0 rbx 0xffffffff82955b8f cpu_info_full_primary+0x2b8f rdx 0x3fd rcx 0 rax 0x12 r8 0x101010101010101 r9 0x8080808080808080 r10 0x9cd9826a6336d3b9 r11 0xd18b0b62335e8174 r12 0xffffffff82955990 cpu_info_full_primary+0x2990 r13 0 r14 0 r15 0x1 rip 0xffffffff8240e298 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000212d42b0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor3948932174) pid=230754 stat=onproc flags process=2 proc=0 pri=56, usrpri=56, nice=20 forw=0xffffffffffffffff, list=0xffff8000212322a8,0xffffffff82ba7f40 process=0xffff800021298010 user=0xffff8000212cf000, vmspace=0xfffffd807effc2e0 estcpu=6, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *56502 230754 6537 0 7 0x2 syz-executor3948932174 6537 460554 28743 0 3 0x10008a sigsusp ksh 28743 192094 19311 0 3 0x9a kqread sshd 42105 377087 1 0 3 0x100083 ttyin getty 19311 317500 1 0 3 0x88 kqread sshd 20680 382186 94400 74 3 0x1100092 bpf pflogd 94400 22719 1 0 3 0x80 netio pflogd 30282 273170 35835 73 3 0x1100090 kqread syslogd 35835 323103 1 0 3 0x100082 netio syslogd 14770 422353 1 0 3 0x100080 kqread resolvd 36069 68643 50973 77 3 0x100092 kqread dhcpleased 86902 243479 50973 77 3 0x100092 kqread dhcpleased 50973 1329 1 0 3 0x80 kqread dhcpleased 41992 447809 0 0 3 0x14200 bored smr 13009 458772 0 0 3 0x14200 pgzero zerothread 40609 132628 0 0 3 0x14200 aiodoned aiodoned 50668 64016 0 0 3 0x14200 syncer update 84423 209906 0 0 3 0x14200 cleaner cleaner 95389 407651 0 0 3 0x14200 reaper reaper 23528 341006 0 0 3 0x14200 pgdaemon pagedaemon 74705 437575 0 0 3 0x14200 bored viomb 90792 220624 0 0 3 0x40014200 acpi0 acpi0 1680 185479 0 0 7 0x40014200 idle1 95340 180684 0 0 3 0x14200 bored softnet 1756 20479 0 0 3 0x14200 bored softnet 51823 117326 0 0 3 0x14200 bored softnet 8424 93934 0 0 3 0x14200 bored softnet 56737 10810 0 0 3 0x14200 bored systqmp 50569 304460 0 0 3 0x14200 bored systq 30671 419041 0 0 3 0x40014200 bored softclock 78545 52713 0 0 3 0x40014200 idle0 1 72904 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 56502 (syz-executor3948932174) thread 0xffff800021232548 (230754) exclusive rwlock netlock r = 0 (0xffffffff829a5720) #0 witness_lock+0x44d #1 sosend+0x500 sys/kern/uipc_socket.c:632 #2 sendit+0x65d sys/kern/uipc_syscalls.c:694 #3 sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 #4 syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] #4 syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 #5 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10155 6455K 6456K 78643K 11245 0 pcb 13 8K 8K 78643K 13 0 rtable 58 1K 2K 78643K 115 0 ifaddr 30 8K 8K 78643K 33 0 counters 40 33K 33K 78643K 40 0 ioctlops 0 0K 4K 78643K 1479 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1167 73K 73K 78643K 1180 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 1 0K 0K 78643K 1 0 proc 67 91K 91K 78643K 282 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 25 122K 122K 78643K 25 0 exec 0 0K 2K 78643K 451 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 62K 78643K 8 0 UVM amap 60 3K 5K 78643K 1579 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 4 0K 0K 78643K 4 0 temp 23 4709K 4773K 78643K 2596 0 kqueue 11 16K 18K 78643K 24 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 21 0 18 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 144 35 0 20 1 0 1 1 0 8 0 syncache 296 5 0 5 2 1 1 1 0 8 1 tcpcb 768 9 0 5 1 0 1 1 0 8 0 arp 120 2 0 0 1 0 1 1 0 8 0 inpcb 368 33 0 26 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 8 0 0 1 0 1 1 0 8 0 pfstkey 120 8 0 0 1 0 1 1 0 8 0 pfstate 336 8 0 0 1 0 1 1 0 8 0 pfrule 1360 21 0 15 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1424 0 39 87 0 87 87 0 8 0 ffsino 272 1424 0 39 93 0 93 93 0 8 0 nchpl 144 1611 0 48 58 0 58 58 0 8 0 uvmvnodes 80 1434 0 0 30 0 30 30 0 8 0 vnodes 216 1434 0 0 80 0 80 80 0 8 0 namei 1024 4446 0 4446 1 0 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 kstatmem 264 8 0 0 1 0 1 1 0 8 0 scxspl 216 3847 0 3847 2 1 1 2 0 8 1 plimitpl 152 16 0 9 1 0 1 1 0 8 0 sigapl 424 334 0 302 5 1 4 5 0 8 0 knotepl 120 43 0 0 2 0 2 2 0 8 0 kqueuepl 216 20 0 13 1 0 1 1 0 8 0 pipepl 320 90 0 87 1 0 1 1 0 8 0 fdescpl 496 317 0 302 3 0 3 3 0 8 0 filepl 152 1208 0 1149 3 0 3 3 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 18 0 9 1 0 1 1 0 8 0 pgrppl 48 18 0 9 1 0 1 1 0 8 0 ucredpl 104 69 0 57 1 0 1 1 0 8 0 zombiepl 144 302 0 302 2 1 1 1 0 8 1 processpl 1064 334 0 302 3 0 3 3 0 8 0 procpl 672 334 0 302 4 1 3 4 0 8 0 sockpl 488 89 0 64 4 0 4 4 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 74 0 0 9 0 9 9 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 124 0 0 8 0 8 8 0 8 0 bufpl 288 1991 0 85 137 0 137 137 0 8 0 anonpl 24 38722 0 36659 16 2 14 15 0 186 1 amapchunkpl 152 2854 0 2752 6 1 5 6 0 158 0 amappl16 200 31 0 30 2 1 1 1 0 8 0 amappl15 192 71 0 67 1 0 1 1 0 8 0 amappl13 176 34 0 33 2 1 1 1 0 8 0 amappl12 168 3 0 3 2 1 1 1 0 8 1 amappl11 160 66 0 49 1 0 1 1 0 8 0 amappl10 152 2 0 0 1 0 1 1 0 8 0 amappl9 144 477 0 475 1 0 1 1 0 8 0 amappl8 136 381 0 380 2 1 1 1 0 8 0 amappl7 128 66 0 59 1 0 1 1 0 8 0 amappl6 120 94 0 87 1 0 1 1 0 8 0 amappl5 112 92 0 80 1 0 1 1 0 8 0 amappl4 104 652 0 630 1 0 1 1 0 8 0 amappl3 96 456 0 430 1 0 1 1 0 8 0 amappl2 88 330 0 301 1 0 1 1 0 8 0 amappl1 80 9809 0 9393 10 0 10 10 0 8 0 amappl 88 1285 0 1244 2 0 2 2 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 318 0 303 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 318 0 303 1 0 1 1 0 8 0 vmmpekpl 168 6361 0 6343 2 0 2 2 0 8 0 vmmpepl 168 27839 0 26968 47 5 42 47 0 357 0 vmsppl 368 317 0 303 2 0 2 2 0 8 0 rwobjpl 56 9901 0 7891 30 0 30 30 0 8 1 pdppl 4096 643 0 606 58 21 37 45 0 8 0 pvpl 32 130654 0 126622 40 5 35 40 0 265 0 pmappl 248 317 0 303 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 414 0 23 12 0 12 12 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257866e) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000bd7200) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806dd8a3e8,fffffd806ef24700,0,fffffd807f00b500) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd806dd8a3e8,0,ffff8000212d4660,0,fffffd807f00b500,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806dd8a3e8,0,ffff8000212d4660,0,fffffd807f00b500,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800021232548,4,ffff8000212d47e0,0,ffff8000212d48d0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800021232548,ffff8000212d4888,ffff8000212d48d0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff8000212d4950) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff8000212d4950) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc2620, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020dd8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020dd8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:175 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800020dd8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020dd8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:175 end trace frame: 0x0, count: -5 ddb{1}>