kernel: integer divide fault trap, code=0 Stopped at tcp_update_sndspace+0x1e1: divl %ecx,%eax ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace tcp_update_sndspace(ffff800000cdef28) at tcp_update_sndspace+0x1e1 sys/netinet/tcp_usrreq.c:1514 tcp_output(ffff800000cdef28) at tcp_output+0x23c8 sys/netinet/tcp_output.c:993 tcp_connect(fffffd80762ac990,fffffd806795dc00) at tcp_connect+0x348 sys/netinet/tcp_usrreq.c:679 sys_connect(ffff80002129cb10,ffff8000212ab0d8,ffff8000212ab120) at sys_connect+0x203 sys/kern/uipc_syscalls.c:422 syscall(ffff8000212ab1a0) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212ab1a0) at syscall+0x606 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb68bcf276c0, count: -6 ddb{0}> show registers rdi 0xffff800023b56000 rsi 0x564 rbp 0xffff8000212aae20 rbx 0x4000 __ALIGN_SIZE+0x3000 rdx 0 rcx 0 rax 0x4000 __ALIGN_SIZE+0x3000 r8 0xd0 r9 0x8f87840e7fb642d9 r10 0x7f1b120d8103bd4 r11 0xe034e56abb7ab8ac r12 0x800 r13 0x800 r14 0x4000 __ALIGN_SIZE+0x3000 r15 0xfffffd80762ac990 rip 0xffffffff82165851 tcp_update_sndspace+0x1e1 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000212aadc0 ss 0x10 tcp_update_sndspace+0x1e1: divl %ecx,%eax ddb{0}> show proc PROC (syz-executor.3) pid=439596 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80002129c2e8,0xffff80002129d090 process=0xffff8000212850d8 user=0xffff8000212a6000, vmspace=0xfffffd806b9256f8 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 94549 52484 47034 0 2 0 syz-executor.6 53631 352396 68289 0 2 0 syz-executor.7 61641 516824 64854 0 2 0 syz-executor.3 *61641 439596 64854 0 7 0x4000000 syz-executor.3 5210 426650 4834 0 2 0 syz-executor.2 58478 325388 11153 0 2 0 syz-executor.1 58478 378454 11153 0 2 0x4000000 syz-executor.1 58478 417039 11153 0 3 0x4000080 fsleep syz-executor.1 4834 131460 53874 0 7 0x2 syz-executor.2 11153 333271 53874 0 2 0x482 syz-executor.1 71963 36969 0 0 3 0x14200 acct acct 76539 178275 53874 0 2 0x2 syz-executor.0 14935 33539 0 0 3 0x14200 bored sosplice 47034 448777 53874 0 3 0x82 nanoslp syz-executor.6 68289 55123 53874 0 3 0x82 nanoslp syz-executor.7 6874 236461 53874 0 3 0x82 nanoslp syz-executor.5 5665 322791 53874 0 2 0x482 syz-executor.4 64854 306689 53874 0 2 0x482 syz-executor.3 53874 298840 4354 0 3 0x82 wait syz-fuzzer 53874 423659 4354 0 3 0x4000082 nanoslp syz-fuzzer 53874 78962 4354 0 3 0x4000082 thrsleep syz-fuzzer 53874 440045 4354 0 3 0x4000082 wait syz-fuzzer 53874 222198 4354 0 3 0x4000082 thrsleep syz-fuzzer 53874 34388 4354 0 3 0x4000082 kqread syz-fuzzer 53874 87697 4354 0 3 0x4000082 wait syz-fuzzer 53874 25672 4354 0 3 0x4000082 wait syz-fuzzer 53874 493219 4354 0 3 0x4000082 wait syz-fuzzer 53874 291868 4354 0 3 0x4000082 thrsleep syz-fuzzer 53874 63372 4354 0 3 0x4000082 thrsleep syz-fuzzer 53874 70885 4354 0 3 0x4000082 wait syz-fuzzer 53874 47828 4354 0 3 0x4000082 wait syz-fuzzer 53874 396752 4354 0 3 0x4000082 wait syz-fuzzer 53874 44631 4354 0 3 0x4000082 thrsleep syz-fuzzer 4354 419345 84830 0 3 0x10008a sigsusp ksh 84830 503198 86527 0 3 0x9a kqread sshd 17714 126163 1 0 3 0x100083 ttyin getty 86527 404579 1 0 3 0x88 kqread sshd 87144 125714 71105 74 3 0x1100092 bpf pflogd 71105 399144 1 0 3 0x80 netio pflogd 85485 110183 18038 73 3 0x1100090 kqread syslogd 18038 298240 1 0 3 0x100082 netio syslogd 6239 327180 1 0 3 0x100080 kqread resolvd 44218 301161 20861 77 3 0x100092 kqread dhcpleased 25981 469475 20861 77 3 0x100092 kqread dhcpleased 20861 437637 1 0 3 0x80 kqread dhcpleased 53915 186138 0 0 3 0x14200 bored smr 29744 246781 0 0 2 0x14200 zerothread 59719 371981 0 0 3 0x14200 aiodoned aiodoned 81579 437113 0 0 3 0x14200 syncer update 4435 249353 0 0 3 0x14200 cleaner cleaner 61876 141004 0 0 3 0x14200 reaper reaper 71515 84693 0 0 3 0x14200 pgdaemon pagedaemon 89511 420441 0 0 3 0x14200 bored viomb 20612 516333 0 0 3 0x40014200 acpi0 acpi0 32261 38390 0 0 3 0x40014200 idle1 75953 123856 0 0 3 0x14200 bored softnet 91738 93889 0 0 3 0x14200 bored softnet 72684 463507 0 0 3 0x14200 bored softnet 3702 318413 0 0 3 0x14200 bored softnet 85405 453202 0 0 3 0x14200 bored systqmp 20141 476898 0 0 3 0x14200 bored systq 82414 159599 0 0 3 0x40014200 bored softclock 55044 170114 0 0 3 0x40014200 idle0 1 54680 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 61641 (syz-executor.3) thread 0xffff80002129cb10 (439596) exclusive rwlock netlock r = 0 (0xffffffff82b49670) #0 witness_lock+0x44d #1 sys_connect+0x1ba isdnssocket sys/kern/uipc_syscalls.c:127 [inline] #1 sys_connect+0x1ba sys/kern/uipc_syscalls.c:413 #2 syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] #2 syscall+0x606 sys/arch/amd64/amd64/trap.c:625 #3 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10214 6631K 6881K 78643K 12850 0 pcb 19 12K 14K 78643K 1681 0 rtable 172 14K 16K 78643K 663 0 ifaddr 76 24K 26K 78643K 198 0 sysctl 2 0K 0K 78643K 2 0 counters 58 35K 36K 78643K 122 0 ioctlops 0 0K 4K 78643K 1578 0 iov 0 0K 28K 78643K 282 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1364 85K 85K 78643K 2171 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 21 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 70 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 16 57K 93K 78643K 1330 0 sigio 0 0K 0K 78643K 51 0 proc 70 91K 128K 78643K 670 0 subproc 104 6K 6K 78643K 156 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 73 0 in_multi 78 5K 6K 78643K 200 0 ether_multi 1 0K 0K 78643K 7 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 61 281K 281K 78643K 61 0 exec 0 0K 1K 78643K 641 0 pfkey data 0 0K 0K 78643K 4 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 64K 78643K 10 0 UVM amap 327 86K 89K 78643K 11104 0 UVM aobj 131 4K 4K 78643K 134 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 78 0 NDP 13 0K 2K 78643K 68 0 temp 133 5778K 5862K 78643K 36988 0 kqueue 14 20K 22K 78643K 100 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 120 112 0 109 2 1 1 2 0 8 0 rtentry 112 190 0 116 4 0 4 4 0 8 0 unpcb 144 799 0 784 10 9 1 6 0 8 0 syncache 296 9 0 9 3 3 0 1 0 8 0 tcpqe 32 101 0 101 3 3 0 1 0 8 0 tcpcb 776 554 0 546 11 9 2 7 0 8 0 arp 120 28 0 15 1 0 1 1 0 8 0 inpcb 368 2926 0 2909 29 21 8 14 0 8 6 nd6 48 41 0 23 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 1 0 1 0 8 0 kcovpl 48 12 0 4 1 0 1 1 0 8 0 ppxss 1256 12 0 12 3 3 0 1 0 8 0 pppxif 1456 1 0 1 1 1 0 1 0 8 0 pfstscr 40 5 0 5 2 1 1 1 0 8 1 pffrag 232 2 0 1 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 41 0 40 2 1 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 pfanchor 1280 21 0 14 2 1 1 1 0 8 0 pfqueue 264 70 0 70 2 2 0 1 0 8 0 pfstitem 24 38 0 25 1 0 1 1 0 8 0 pfstkey 128 48 0 35 1 0 1 1 0 8 0 pfstate 384 43 0 30 3 1 2 3 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 898 0 563 33 12 21 30 0 8 0 art_table 32 899 0 563 4 0 4 4 0 8 0 art_node 16 187 0 123 1 0 1 1 0 8 0 sysvmsgpl 40 89 0 67 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 66 0 56 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 3317 0 1873 91 0 91 91 0 8 0 ffsino 272 3317 0 1873 97 0 97 97 0 8 0 nchpl 144 5189 0 3544 63 0 63 63 0 8 0 rtmask 32 2 0 2 1 1 0 1 0 8 0 uvmvnodes 80 3931 0 0 81 0 81 81 0 8 0 vnodes 216 3931 0 0 219 0 219 219 0 8 0 namei 1024 19387 0 19387 3 2 1 2 0 8 1 percpumem 16 74 0 32 1 0 1 1 0 8 0 kstatmem 264 80 0 54 3 1 2 3 0 8 0 scxspl 216 19803 0 19803 11 9 2 8 0 8 2 plimitpl 152 72 0 56 1 0 1 1 0 8 0 sigapl 424 1644 0 1595 8 2 6 7 0 8 0 futexpl 64 12744 0 12743 2 1 1 1 0 8 0 knotepl 120 302 0 0 8 0 8 8 0 8 0 kqueuepl 216 239 0 229 5 0 5 5 0 8 4 pipepl 320 329 0 301 8 5 3 6 0 8 0 fdescpl 496 1625 0 1596 5 1 4 5 0 8 0 filepl 152 12666 0 12412 27 12 15 19 0 8 4 lockfpl 104 325 0 323 1 0 1 1 0 8 0 lockfspl 48 89 0 87 1 0 1 1 0 8 0 sessionpl 144 28 0 11 1 0 1 1 0 8 0 pgrppl 48 28 0 11 1 0 1 1 0 8 0 ucredpl 104 1943 0 1931 1 0 1 1 0 8 0 zombiepl 144 1597 0 1595 1 0 1 1 0 8 0 processpl 1072 1644 0 1595 4 0 4 4 0 8 0 procpl 696 3965 0 3899 8 0 8 8 0 8 0 srpgc 96 11 0 11 3 3 0 1 0 8 0 sosppl 168 11 0 11 3 2 1 1 0 8 1 sockpl 488 3886 0 3851 67 54 13 33 0 8 8 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 10 0 0 2 0 2 2 0 8 0 mcl12k 12288 11 0 0 2 0 2 2 0 8 0 mcl9k 9216 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 14 0 0 2 0 2 2 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 406 0 0 50 0 50 50 0 8 0 mtagpl 96 179 0 0 5 0 5 5 0 8 0 mbufpl 256 1212 0 0 71 0 71 71 0 8 0 bufpl 288 6728 0 403 452 0 452 452 0 8 0 anonpl 24 410131 0 392162 196 23 173 194 0 186 46 amapchunkpl 152 33500 0 32710 67 23 44 65 0 158 7 amappl16 200 4453 0 3899 44 2 42 42 0 8 11 amappl15 192 10 0 9 1 0 1 1 0 8 0 amappl14 184 178 0 164 2 1 1 2 0 8 0 amappl13 176 3 0 3 1 1 0 1 0 8 0 amappl12 168 474 0 470 1 0 1 1 0 8 0 amappl11 160 51 0 37 1 0 1 1 0 8 0 amappl10 152 37 0 29 1 0 1 1 0 8 0 amappl9 144 965 0 963 1 0 1 1 0 8 0 amappl8 136 200 0 142 2 0 2 2 0 8 0 amappl7 128 169 0 143 2 0 2 2 0 8 0 amappl6 120 191 0 179 2 1 1 2 0 8 0 amappl5 112 160 0 150 1 0 1 1 0 8 0 amappl4 104 576 0 542 2 0 2 2 0 8 0 amappl3 96 4267 0 4216 2 0 2 2 0 8 0 amappl2 88 2070 0 1992 3 1 2 3 0 8 0 amappl1 80 39830 0 39082 29 11 18 28 0 8 0 amappl 88 10485 0 10290 6 0 6 6 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 1625 0 1596 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1625 0 1596 1 0 1 1 0 8 0 vmmpekpl 168 17868 0 17809 4 0 4 4 0 8 0 vmmpepl 168 159324 0 156493 183 30 153 155 0 357 17 vmsppl 440 1624 0 1596 6 2 4 5 0 8 0 rwobjpl 56 48035 0 42228 86 0 86 86 0 8 1 pdppl 4096 3257 0 3192 183 116 67 83 0 8 2 pvpl 32 854233 0 830254 358 55 303 340 0 265 90 pmappl 248 1624 0 1596 3 1 2 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1027 0 156 25 0 25 25 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace tcp_update_sndspace(ffff800000cdef28) at tcp_update_sndspace+0x1e1 sys/netinet/tcp_usrreq.c:1514 tcp_output(ffff800000cdef28) at tcp_output+0x23c8 sys/netinet/tcp_output.c:993 tcp_connect(fffffd80762ac990,fffffd806795dc00) at tcp_connect+0x348 sys/netinet/tcp_usrreq.c:679 sys_connect(ffff80002129cb10,ffff8000212ab0d8,ffff8000212ab120) at sys_connect+0x203 sys/kern/uipc_syscalls.c:422 syscall(ffff8000212ab1a0) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff8000212ab1a0) at syscall+0x606 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb68bcf276c0, count: -6 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020d68ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f kd_curproc sys/dev/kcov.c:578 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f sys/dev/kcov.c:148 uvm_map_inentry(ffff8000212b2b18,ffff8000212b2b90,a47f585039a,ffffffff8277224b,ffffffff81728060,2a) at uvm_map_inentry+0x93 sys/uvm/uvm_map.c:1687 syscall(ffff80002e417ec0) at syscall+0x441 mi_syscall sys/sys/syscall_mi.h:96 [inline] syscall(ffff80002e417ec0) at syscall+0x441 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd5820, count: -7