panic: tcp_output Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 118422 20941 32767 0x10 0 1 syz-executor.0 *225076 20941 32767 0x10 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257e05d) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000d0f658) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806983f018,fffffd806f0b5b00,0,fffffd806d9d3500) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:944 sosend(fffffd806983f018,0,ffff80002e4c14d0,0,fffffd806d9d3500,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806983f018,0,ffff80002e4c14d0,0,fffffd806d9d3500,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff80002965a7e0,3,ffff80002e4c1650,0,ffff80002e4c1740) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff80002965a7e0,ffff80002e4c16f8,ffff80002e4c1740) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e4c17c0) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e4c17c0) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x87c312dd2f0, 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(ffffffff8257e05d) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000d0f658) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806983f018,fffffd806f0b5b00,0,fffffd806d9d3500) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:944 sosend(fffffd806983f018,0,ffff80002e4c14d0,0,fffffd806d9d3500,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806983f018,0,ffff80002e4c14d0,0,fffffd806d9d3500,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff80002965a7e0,3,ffff80002e4c1650,0,ffff80002e4c1740) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff80002965a7e0,ffff80002e4c16f8,ffff80002e4c1740) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e4c17c0) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e4c17c0) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x87c312dd2f0, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002e4c1130 rbx 0xffffffff829b9b8f cpu_info_full_primary+0x2b8f rdx 0 rcx 0 rax 0xffff80002965a7e0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x231f537e4176afc7 r11 0x204691f80f6ac7de r12 0xffffffff829b9990 cpu_info_full_primary+0x2990 r13 0 r14 0 r15 0x1 rip 0xffffffff824835f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e4c1120 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=225076 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=82, nice=20 forw=0xffffffffffffffff, list=0xffff80002965b500,0xffff80002965b270 process=0xffff80002ca88020 user=0xffff80002e4bc000, vmspace=0xfffffd8069486748 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 14911 232257 30921 32767 2 0x10 syz-executor.7 14911 329474 30921 32767 2 0x4000010 syz-executor.7 22471 25248 78118 32767 2 0x10 syz-executor.5 22471 286681 78118 32767 3 0x4000090 fsleep syz-executor.5 20941 118422 6463 32767 7 0x10 syz-executor.0 20941 56534 6463 32767 2 0x4000010 syz-executor.0 20941 149099 6463 32767 2 0x4000010 syz-executor.0 *20941 225076 6463 32767 7 0x4000010 syz-executor.0 20941 17149 6463 32767 2 0x4000010 syz-executor.0 70787 356754 19348 32767 2 0x10 syz-executor.2 70787 317565 19348 32767 3 0x4000090 fsleep syz-executor.2 87628 234417 75403 32767 2 0x10 syz-executor.3 87628 317361 75403 32767 3 0x4000090 fsleep syz-executor.3 4785 335207 31646 32767 2 0x10 syz-executor.1 55939 450052 67533 32767 2 0x10 syz-executor.6 55939 244660 67533 32767 2 0x4000010 syz-executor.6 91923 433686 34748 32767 2 0x10 syz-executor.4 91923 384662 34748 32767 2 0x4000010 syz-executor.4 91923 446941 34748 32767 3 0x4000090 fsleep syz-executor.4 78118 515208 82232 32767 3 0x90 nanoslp syz-executor.5 82232 38371 64065 0 3 0x82 wait syz-executor.5 40356 226819 0 0 3 0x14200 bored sosplice 67533 398624 12946 32767 3 0x90 nanoslp syz-executor.6 30921 416326 92273 32767 3 0x90 nanoslp syz-executor.7 92273 105949 64065 0 3 0x82 wait syz-executor.7 75403 329371 65477 32767 3 0x90 nanoslp syz-executor.3 34748 172915 74877 32767 3 0x90 nanoslp syz-executor.4 12946 53967 64065 0 3 0x82 wait syz-executor.6 74877 220565 64065 0 3 0x82 wait syz-executor.4 65477 490995 64065 0 3 0x82 wait syz-executor.3 19348 421715 66111 32767 3 0x90 nanoslp syz-executor.2 66111 472126 64065 0 3 0x82 wait syz-executor.2 6463 281089 81221 32767 3 0x90 nanoslp syz-executor.0 31646 448278 89726 32767 2 0x10 syz-executor.1 89726 504997 64065 0 3 0x82 wait syz-executor.1 81221 20832 64065 0 3 0x82 wait syz-executor.0 64065 231184 47992 0 3 0x82 thrsleep syz-fuzzer 64065 502416 47992 0 3 0x4000082 thrsleep syz-fuzzer 64065 37539 47992 0 3 0x4000082 wait syz-fuzzer 64065 469076 47992 0 3 0x4000082 kqread syz-fuzzer 64065 170275 47992 0 3 0x4000082 thrsleep syz-fuzzer 64065 47286 47992 0 3 0x4000082 wait syz-fuzzer 64065 386939 47992 0 3 0x4000082 wait syz-fuzzer 64065 166704 47992 0 3 0x4000082 wait syz-fuzzer 64065 396822 47992 0 3 0x4000082 thrsleep syz-fuzzer 64065 457856 47992 0 3 0x4000082 thrsleep syz-fuzzer 64065 365179 47992 0 3 0x4000082 wait syz-fuzzer 64065 188918 47992 0 3 0x4000082 wait syz-fuzzer 64065 149398 47992 0 3 0x4000082 wait syz-fuzzer 64065 165173 47992 0 3 0x4000082 thrsleep syz-fuzzer 64065 305470 47992 0 3 0x4000082 wait syz-fuzzer 64065 309900 47992 0 3 0x4000082 thrsleep syz-fuzzer 47992 330549 65822 0 3 0x10008a sigsusp ksh 65822 100088 56521 0 3 0x9a kqread sshd 48796 485193 1 0 3 0x100083 ttyin getty 56521 505327 1 0 3 0x88 kqread sshd 42332 423538 71753 73 3 0x1100090 kqread syslogd 71753 61898 1 0 3 0x100082 netio syslogd 82005 83850 1 0 3 0x100080 kqread resolvd 87901 198217 77800 77 3 0x100092 kqread dhcpleased 79510 495586 77800 77 3 0x100092 kqread dhcpleased 77800 240801 1 0 3 0x80 kqread dhcpleased 14244 304894 0 0 3 0x14200 bored smr 75880 516885 0 0 2 0x14200 zerothread 18944 169610 0 0 3 0x14200 aiodoned aiodoned 53829 375899 0 0 3 0x14200 syncer update 97307 44973 0 0 3 0x14200 cleaner cleaner 87276 515626 0 0 3 0x14200 reaper reaper 91020 158906 0 0 3 0x14200 pgdaemon pagedaemon 46719 441136 0 0 3 0x14200 bored viomb 76359 129649 0 0 3 0x40014200 acpi0 acpi0 90313 507124 0 0 3 0x40014200 idle1 3597 126165 0 0 3 0x14200 bored softnet 76129 33116 0 0 3 0x14200 bored softnet 2444 89451 0 0 3 0x14200 bored softnet 27571 42434 0 0 3 0x14200 bored softnet 50911 504615 0 0 3 0x14200 bored systqmp 32521 523767 0 0 3 0x14200 bored systq 60548 306613 0 0 3 0x40014200 bored softclock 59832 291171 0 0 3 0x40014200 idle0 1 473149 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 20941 (syz-executor.0) thread 0xffff80002966fa50 (118422) exclusive rwlock vmmaplk r = 0 (0xfffffd8069486760) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5209 #3 uvm_mapanon+0x22f sys/uvm/uvm_map.c:783 #4 sys_mmap+0x870 uvm_mmapanon sys/uvm/uvm_mmap.c:986 [inline] #4 sys_mmap+0x870 sys/uvm/uvm_mmap.c:425 #5 syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline] #5 syscall+0x435 sys/arch/amd64/amd64/trap.c:585 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82b4d360) #0 witness_lock+0x44d #1 syscall+0x41d mi_syscall sys/sys/syscall_mi.h:100 [inline] #1 syscall+0x41d sys/arch/amd64/amd64/trap.c:585 #2 Xsyscall+0x128 Process 20941 (syz-executor.0) thread 0xffff80002965a7e0 (225076) exclusive rwlock netlock r = 0 (0xffffffff829ae840) #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 10209 6412K 6419K 78643K 11307 0 pcb 13 10K 12K 78643K 15 0 rtable 240 6K 7K 78643K 887 0 ifaddr 82 16K 16K 78643K 98 0 sysctl 2 0K 2K 78643K 5 0 counters 56 35K 35K 78643K 60 0 ioctlops 0 0K 2K 78643K 130 0 iov 0 0K 44K 78643K 682 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1271 79K 79K 78643K 1909 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 61 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 1248 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 26 97K 125K 78643K 3936 0 sigio 0 0K 0K 78643K 147 0 proc 56 78K 115K 78643K 735 0 subproc 104 6K 6K 78643K 130 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 224 0 in_multi 99 6K 6K 78643K 162 0 ether_multi 1 0K 0K 78643K 17 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 235 1049K 1049K 78643K 235 0 exec 0 0K 2K 78643K 1321 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 305 85K 97K 78643K 25755 0 UVM aobj 131 6K 6K 78643K 134 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 193 0 NDP 11 0K 2K 78643K 33 0 temp 124 4726K 4790K 78643K 13230 0 kqueue 12 18K 26K 78643K 416 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 120 402 0 399 5 4 1 3 0 8 0 rtentry 112 136 0 23 4 0 4 4 0 8 0 unpcb 144 4103 0 4090 44 43 1 10 0 8 0 syncache 296 50 0 50 8 7 1 1 0 8 1 tcpqe 32 45 0 45 8 7 1 1 0 8 1 tcpcb 768 1597 0 1574 55 51 4 12 0 8 0 arp 120 23 0 4 1 0 1 1 0 8 0 ipq 40 4 0 4 2 2 0 1 0 8 0 ipqe 40 14 0 14 2 2 0 1 0 8 0 inpcb 368 7771 0 7749 57 48 9 14 0 8 5 nd6 48 32 0 6 1 0 1 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 556 0 88 30 0 30 30 0 8 0 art_table 32 557 0 88 4 0 4 4 0 8 0 art_node 16 135 0 32 1 0 1 1 0 8 0 sysvmsgpl 40 7 0 5 1 0 1 1 0 8 0 semapl 112 1246 0 1236 1 0 1 1 0 8 0 shmpl 112 131 0 3 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 6544 0 5105 91 0 91 91 0 8 0 ffsino 272 6544 0 5105 97 0 97 97 0 8 0 nchpl 144 11911 0 10276 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 41375 0 41375 2 1 1 2 0 8 1 percpumem 16 42 0 2 1 0 1 1 0 8 0 kstatmem 264 26 0 4 2 0 2 2 0 8 0 scxspl 216 33002 0 33002 15 14 1 8 0 8 1 plimitpl 152 1033 0 1011 3 2 1 2 0 8 0 sigapl 424 4222 0 4167 7 0 7 7 0 8 0 futexpl 64 37577 0 37573 1 0 1 1 0 8 0 knotepl 120 261 0 0 7 1 6 6 0 8 0 kqueuepl 216 1596 0 1588 36 33 3 6 0 8 2 pipepl 320 1398 0 1370 40 37 3 14 0 8 0 fdescpl 496 4204 0 4167 7 2 5 6 0 8 0 filepl 152 33645 0 33409 68 55 13 23 0 8 3 lockfpl 104 828 0 826 1 0 1 1 0 8 0 lockfspl 48 224 0 222 1 0 1 1 0 8 0 sessionpl 144 25 0 9 1 0 1 1 0 8 0 pgrppl 48 39 0 23 1 0 1 1 0 8 0 ucredpl 104 4837 0 4819 1 0 1 1 0 8 0 zombiepl 144 4167 0 4167 1 0 1 1 0 8 1 processpl 1064 4222 0 4167 5 0 5 5 0 8 0 procpl 672 12153 0 12072 10 2 8 9 0 8 1 sosppl 168 70 0 69 7 6 1 1 0 8 0 sockpl 488 12460 0 12425 203 189 14 34 0 8 8 mcl64k 65536 19 0 0 3 0 3 3 0 8 0 mcl16k 16384 18 0 0 3 1 2 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 11 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 20 0 0 3 0 3 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 224 0 0 24 0 24 24 0 8 2 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 581 0 0 26 0 26 26 0 8 0 bufpl 288 9044 0 2717 453 0 453 453 0 8 0 anonpl 24 870898 0 857769 183 92 91 130 0 186 0 amapchunkpl 152 75280 0 74603 62 33 29 40 0 158 2 amappl16 200 14381 0 13982 103 81 22 45 0 8 0 amappl15 192 550 0 545 1 0 1 1 0 8 0 amappl14 184 977 0 968 1 0 1 1 0 8 0 amappl13 176 99 0 96 1 0 1 1 0 8 0 amappl12 168 966 0 958 1 0 1 1 0 8 0 amappl11 160 463 0 447 1 0 1 1 0 8 0 amappl10 152 590 0 584 1 0 1 1 0 8 0 amappl9 144 990 0 983 1 0 1 1 0 8 0 amappl8 136 1208 0 1117 4 0 4 4 0 8 0 amappl7 128 626 0 603 1 0 1 1 0 8 0 amappl6 120 710 0 695 2 1 1 2 0 8 0 amappl5 112 3560 0 3534 1 0 1 1 0 8 0 amappl4 104 1783 0 1749 2 0 2 2 0 8 0 amappl3 96 13527 0 13459 2 0 2 2 0 8 0 amappl2 88 1134 0 1097 2 0 2 2 0 8 0 amappl1 80 107373 0 106612 21 4 17 19 0 8 1 amappl 88 25049 0 24861 5 0 5 5 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 72 133 0 3 3 0 3 3 0 8 0 uaddrrnd 24 4204 0 4167 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4204 0 4167 1 0 1 1 0 8 0 vmmpekpl 168 39625 0 39566 3 0 3 3 0 8 0 vmmpepl 168 419229 0 416283 185 53 132 146 0 357 3 vmsppl 368 4203 0 4167 4 0 4 4 0 8 0 rwobjpl 56 113528 0 106028 113 6 107 109 0 8 0 pdppl 4096 8415 0 8334 207 126 81 95 0 8 0 pvpl 32 1656849 0 1638440 301 141 160 240 0 265 0 pmappl 248 4203 0 4167 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1010 0 178 24 0 24 24 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(ffffffff8257e05d) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000d0f658) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806983f018,fffffd806f0b5b00,0,fffffd806d9d3500) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:944 sosend(fffffd806983f018,0,ffff80002e4c14d0,0,fffffd806d9d3500,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806983f018,0,ffff80002e4c14d0,0,fffffd806d9d3500,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff80002965a7e0,3,ffff80002e4c1650,0,ffff80002e4c1740) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff80002965a7e0,ffff80002e4c16f8,ffff80002e4c1740) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e4c17c0) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e4c17c0) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x87c312dd2f0, 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 end of kernel end trace frame: 0x7f7ffffeedf0, count: 12 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 end of kernel end trace frame: 0x7f7ffffeedf0, count: -3