panic: tcp_output Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 28978 33819 32767 0x10 0 1 syz-executor.4 *297313 44916 32767 0x10 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257b2ef) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000ce20d8) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd8071525018,fffffd8075665100,fffffd8064c74300,fffffd807007fb00) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd8071525018,fffffd8064c74300,ffff80002e4f2b70,0,fffffd807007fb00,4) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd8071525018,fffffd8064c74300,ffff80002e4f2b70,0,fffffd807007fb00,4) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000ffff0000,6,ffff80002e4f2cf0,4,ffff80002e4f2de0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000ffff0000,ffff80002e4f2d98,ffff80002e4f2de0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e4f2e60) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e4f2e60) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5338d929d20, 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(ffffffff8257b2ef) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000ce20d8) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd8071525018,fffffd8075665100,fffffd8064c74300,fffffd807007fb00) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd8071525018,fffffd8064c74300,ffff80002e4f2b70,0,fffffd807007fb00,4) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd8071525018,fffffd8064c74300,ffff80002e4f2b70,0,fffffd807007fb00,4) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000ffff0000,6,ffff80002e4f2cf0,4,ffff80002e4f2de0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000ffff0000,ffff80002e4f2d98,ffff80002e4f2de0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e4f2e60) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e4f2e60) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5338d929d20, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002e4f27d0 rbx 0xffffffff829a1b8f cpu_info_full_primary+0x2b8f rdx 0xffff800000bb9ac0 rcx 0 rax 0xffff8000ffff0000 r8 0x101010101010101 r9 0x8080808080808080 r10 0x16c5bfa2900103d8 r11 0x515d2c290c8e1273 r12 0xffffffff829a1990 cpu_info_full_primary+0x2990 r13 0 r14 0 r15 0x1 rip 0xffffffff81a16d08 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e4f27c0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=297313 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff62b0,0xffff8000ffff0fd0 process=0xffff8000ffff8430 user=0xffff80002e4ed000, vmspace=0xfffffd8068b8e2f8 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 33819 28978 34802 32767 7 0x10 syz-executor.4 33819 94729 34802 32767 2 0x4000010 syz-executor.4 44916 389089 31845 32767 2 0x10 syz-executor.0 *44916 297313 31845 32767 7 0x4000010 syz-executor.0 46792 290221 59267 32767 2 0x10 syz-executor.2 46792 414932 59267 32767 3 0x4000090 fsleep syz-executor.2 46792 174806 59267 32767 2 0x4000010 syz-executor.2 75977 350367 48049 32767 3 0x90 nanoslp syz-executor.1 75977 331324 48049 32767 3 0x4000090 fsleep syz-executor.1 24792 310815 5502 32767 3 0x90 nanoslp syz-executor.6 24792 279273 5502 32767 2 0x4000010 syz-executor.6 24792 238537 5502 32767 3 0x4000090 fsleep syz-executor.6 24792 130415 5502 32767 3 0x4000090 fsleep syz-executor.6 23204 406962 17470 32767 2 0x10 syz-executor.7 23204 2077 17470 32767 3 0x4000090 fsleep syz-executor.7 95651 441999 86165 32767 2 0x10 syz-executor.3 95651 401165 86165 32767 3 0x4000090 fsleep syz-executor.3 31845 506525 2352 32767 2 0x10 syz-executor.0 2352 506094 52049 0 3 0x82 wait syz-executor.0 59267 23821 505 32767 2 0x10 syz-executor.2 505 370975 52049 0 3 0x82 wait syz-executor.2 5502 107339 79589 32767 3 0x90 nanoslp syz-executor.6 79589 416103 52049 0 3 0x82 wait syz-executor.6 34802 207421 83551 32767 3 0x90 nanoslp syz-executor.4 83551 460950 52049 0 3 0x82 wait syz-executor.4 83114 396898 16284 32767 3 0x90 nanoslp syz-executor.5 16284 124257 52049 0 3 0x82 wait syz-executor.5 86165 269885 18097 32767 2 0x10 syz-executor.3 18097 419962 52049 0 3 0x82 wait syz-executor.3 48049 283550 55096 32767 2 0x10 syz-executor.1 55096 254425 52049 0 3 0x82 wait syz-executor.1 48328 28002 0 0 3 0x14200 bored sosplice 17470 110310 35754 32767 3 0x90 nanoslp syz-executor.7 35754 56150 52049 0 3 0x82 wait syz-executor.7 52049 131072 56904 0 3 0x82 thrsleep syz-fuzzer 52049 54326 56904 0 3 0x4000082 thrsleep syz-fuzzer 52049 430608 56904 0 3 0x4000082 wait syz-fuzzer 52049 364029 56904 0 3 0x4000082 kqread syz-fuzzer 52049 203874 56904 0 3 0x4000082 thrsleep syz-fuzzer 52049 6931 56904 0 3 0x4000082 thrsleep syz-fuzzer 52049 166266 56904 0 3 0x4000082 thrsleep syz-fuzzer 52049 39213 56904 0 3 0x4000082 wait syz-fuzzer 52049 405668 56904 0 3 0x4000082 thrsleep syz-fuzzer 52049 133398 56904 0 3 0x4000082 wait syz-fuzzer 52049 505401 56904 0 3 0x4000082 wait syz-fuzzer 52049 265073 56904 0 3 0x4000082 wait syz-fuzzer 52049 23469 56904 0 3 0x4000082 wait syz-fuzzer 52049 28507 56904 0 3 0x4000082 wait syz-fuzzer 52049 94456 56904 0 3 0x4000082 thrsleep syz-fuzzer 52049 66367 56904 0 3 0x4000082 wait syz-fuzzer 56904 352161 4040 0 3 0x10008a sigsusp ksh 4040 32398 29316 0 3 0x9a kqread sshd 62587 200555 1 0 3 0x100083 ttyin getty 29316 270206 1 0 3 0x88 kqread sshd 4123 24437 59238 73 3 0x1100090 kqread syslogd 59238 498527 1 0 3 0x100082 netio syslogd 67133 308287 1 0 3 0x100080 kqread resolvd 64917 119279 50439 77 3 0x100092 kqread dhcpleased 33162 41038 50439 77 3 0x100092 kqread dhcpleased 50439 287172 1 0 3 0x80 kqread dhcpleased 23760 286681 0 0 3 0x14200 bored smr 7385 220709 0 0 2 0x14200 zerothread 65006 432551 0 0 3 0x14200 aiodoned aiodoned 91904 44383 0 0 3 0x14200 syncer update 34852 513307 0 0 3 0x14200 cleaner cleaner 76646 95933 0 0 3 0x14200 reaper reaper 35524 1591 0 0 3 0x14200 pgdaemon pagedaemon 77188 167595 0 0 3 0x14200 bored viomb 57486 520487 0 0 3 0x40014200 acpi0 acpi0 3710 166003 0 0 3 0x40014200 idle1 88930 18310 0 0 3 0x14200 bored softnet 87211 46243 0 0 3 0x14200 bored softnet 33316 460241 0 0 3 0x14200 bored softnet 75297 405152 0 0 3 0x14200 bored softnet 26479 301198 0 0 3 0x14200 bored systqmp 89959 73361 0 0 3 0x14200 bored systq 64769 494639 0 0 3 0x40014200 bored softclock 17209 106381 0 0 3 0x40014200 idle0 1 97512 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 44916 (syz-executor.0) thread 0xffff8000ffff0000 (297313) exclusive rwlock netlock r = 0 (0xffffffff8291ebe0) #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 10211 6412K 6419K 78643K 11396 0 pcb 13 16K 20K 78643K 19 0 rtable 244 6K 7K 78643K 3000 0 ifaddr 82 17K 17K 78643K 305 0 sysctl 3 1K 3K 78643K 41 0 counters 56 35K 35K 78643K 118 0 ioctlops 0 0K 2K 78643K 2309 0 iov 0 0K 40K 78643K 3466 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1271 79K 79K 78643K 5259 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 231 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 4944 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 25 93K 113K 78643K 18193 0 sigio 0 0K 0K 78643K 153 0 proc 57 90K 103K 78643K 2751 0 subproc 104 6K 6K 78643K 507 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1280 0 in_multi 99 6K 7K 78643K 663 0 ether_multi 1 0K 0K 78643K 85 0 mrt 1 0K 0K 78643K 2 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 247 1102K 1102K 78643K 247 0 exec 0 0K 2K 78643K 5301 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 372 97K 112K 78643K 112003 0 UVM aobj 131 4K 4K 78643K 137 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 477 0 NDP 11 0K 2K 78643K 120 0 temp 124 4726K 4792K 78643K 49137 0 kqueue 12 18K 30K 78643K 1882 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 2275 0 2272 30 29 1 3 0 8 0 rtentry 112 474 0 359 4 0 4 4 0 8 0 unpcb 144 22965 0 22918 174 168 6 11 0 8 4 syncache 296 184 0 184 35 34 1 1 0 8 1 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 178 0 178 25 24 1 1 0 8 1 tcpcb 768 23997 0 23898 493 482 11 30 0 8 1 arp 120 86 0 68 1 0 1 1 0 8 0 ipq 40 40 0 39 13 12 1 1 0 8 0 ipqe 40 235 0 234 13 12 1 1 0 8 0 inpcb 368 31427 0 31409 278 270 8 20 0 8 5 nd6 48 133 0 104 1 0 1 1 0 8 0 kcovpl 48 39 0 31 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1871 0 1396 32 2 30 30 0 8 0 art_table 32 1872 0 1396 4 0 4 4 0 8 0 art_node 16 473 0 368 1 0 1 1 0 8 0 sysvmsgpl 40 7 0 5 1 0 1 1 0 8 0 semapl 112 4876 0 4866 1 0 1 1 0 8 0 shmpl 112 134 0 6 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 26041 0 24575 92 0 92 92 0 8 0 ffsino 272 26041 0 24575 98 0 98 98 0 8 0 nchpl 144 49820 0 48177 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 182695 0 182695 3 2 1 2 0 8 1 percpumem 16 71 0 31 1 0 1 1 0 8 0 kstatmem 264 84 0 62 2 0 2 2 0 8 0 scxspl 216 142028 0 142028 39 37 2 8 0 8 2 plimitpl 152 5012 0 4990 16 14 2 2 0 8 1 sigapl 424 18416 0 18361 7 0 7 7 0 8 0 futexpl 64 169946 0 169940 2 1 1 1 0 8 0 knotepl 120 1138 0 0 17 0 17 17 0 8 0 kqueuepl 216 6346 0 6338 101 100 1 12 0 8 0 pipepl 320 4816 0 4788 130 122 8 11 0 8 5 fdescpl 496 18398 0 18362 7 2 5 6 0 8 0 filepl 152 153495 0 153224 221 204 17 24 0 8 6 lockfpl 104 2428 0 2426 2 1 1 2 0 8 0 lockfspl 48 676 0 674 1 0 1 1 0 8 0 sessionpl 144 54 0 38 1 0 1 1 0 8 0 pgrppl 48 248 0 232 1 0 1 1 0 8 0 ucredpl 104 23056 0 23038 1 0 1 1 0 8 0 zombiepl 144 18362 0 18361 1 0 1 1 0 8 0 processpl 1064 18416 0 18361 4 0 4 4 0 8 0 procpl 672 54721 0 54641 36 28 8 9 0 8 0 sosppl 168 305 0 302 22 21 1 1 0 8 0 sockpl 488 57178 0 57109 1005 991 14 45 0 8 5 mcl64k 65536 49 0 0 3 0 3 3 0 8 0 mcl16k 16384 34 0 0 4 1 3 3 0 8 0 mcl12k 12288 33 0 0 2 0 2 2 0 8 0 mcl9k 9216 49 0 0 3 1 2 2 0 8 0 mcl8k 8192 33 0 0 5 1 4 4 0 8 0 mcl4k 4096 103 0 0 5 1 4 4 0 8 0 mcl2k2 2112 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 317 0 0 22 0 22 22 0 8 0 mtagpl 96 8 0 0 1 0 1 1 0 8 0 mbufpl 256 4903 0 0 282 0 282 282 0 8 0 bufpl 288 31746 0 25416 453 0 453 453 0 8 0 anonpl 24 3834546 0 3821302 252 143 109 130 0 186 5 amapchunkpl 152 350995 0 350325 175 146 29 41 0 158 0 amappl16 200 61190 0 60797 298 268 30 44 0 8 8 amappl15 192 7388 0 7379 1 0 1 1 0 8 0 amappl14 184 512 0 504 1 0 1 1 0 8 0 amappl13 176 307 0 306 1 0 1 1 0 8 0 amappl12 168 4060 0 4051 1 0 1 1 0 8 0 amappl11 160 2707 0 2690 1 0 1 1 0 8 0 amappl10 152 129 0 123 1 0 1 1 0 8 0 amappl9 144 1830 0 1826 1 0 1 1 0 8 0 amappl8 136 4348 0 4190 6 0 6 6 0 8 0 amappl7 128 2939 0 2910 1 0 1 1 0 8 0 amappl6 120 1766 0 1748 2 1 1 2 0 8 0 amappl5 112 15222 0 15200 1 0 1 1 0 8 0 amappl4 104 7138 0 7102 12 10 2 3 0 8 1 amappl3 96 60680 0 60617 2 0 2 2 0 8 0 amappl2 88 1786 0 1742 12 10 2 2 0 8 0 amappl1 80 458926 0 458158 19 2 17 19 0 8 0 amappl 88 110199 0 110000 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 72 136 0 6 3 0 3 3 0 8 0 uaddrrnd 24 18399 0 18363 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 18399 0 18363 1 0 1 1 0 8 0 vmmpekpl 168 156645 0 156601 3 0 3 3 0 8 0 vmmpepl 168 1827058 0 1824077 344 199 145 146 0 357 11 vmsppl 368 18398 0 18363 4 0 4 4 0 8 0 rwobjpl 56 462267 0 454700 141 30 111 112 0 8 2 pdppl 4096 36805 0 36726 497 416 81 89 0 8 2 pvpl 32 7180812 0 7161944 591 399 192 255 0 265 16 pmappl 248 18398 0 18363 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1785 0 695 32 0 32 32 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(ffffffff8257b2ef) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000ce20d8) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd8071525018,fffffd8075665100,fffffd8064c74300,fffffd807007fb00) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd8071525018,fffffd8064c74300,ffff80002e4f2b70,0,fffffd807007fb00,4) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd8071525018,fffffd8064c74300,ffff80002e4f2b70,0,fffffd807007fb00,4) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000ffff0000,6,ffff80002e4f2cf0,4,ffff80002e4f2de0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000ffff0000,ffff80002e4f2d98,ffff80002e4f2de0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e4f2e60) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e4f2e60) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5338d929d20, 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: 0x7f7fffffb130, 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: 0x7f7fffffb130, count: -3