kernel: integer divide fault trap, code=0 Stopped at m_pool_used+0x45: divl %ecx,%eax ddb> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic the kernel did not panic ddb> trace m_pool_used() at m_pool_used+0x45 sys/kern/uipc_mbuf.c:1502 sbchecklowmem() at sbchecklowmem+0x21 sys/kern/uipc_socket2.c:642 tcp_update_sndspace(ffff800000cdd230) at tcp_update_sndspace+0x43 sys/netinet/tcp_usrreq.c:1527 tcp_output(ffff800000cdd230) at tcp_output+0x24cc sys/netinet/tcp_output.c:1029 tcp_send(fffffd806e5e0730,fffffd8071d0e100,0,0) at tcp_send+0xf5 sys/netinet/tcp_usrreq.c:849 sosend(fffffd806e5e0730,0,ffff800021678db8,0,0,80) at sosend+0x66d dofilewritev(ffff8000ffff8da0,4,ffff800021678db8,0,ffff800021678ea0) at dofilewritev+0x1a0 sys/kern/sys_generic.c:375 sys_write(ffff8000ffff8da0,ffff800021678e50,ffff800021678ea0) at sys_write+0x87 sys/kern/sys_generic.c:295 syscall(ffff800021678f20) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:632 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x763e63e32780, count: -10 ddb> show registers rdi 0xffff800000cdd230 rsi 0x4000000 __kernel_phys_end+0x1200000 rbp 0xffff800021678970 rbx 0x140203e4 rdx 0 rcx 0 rax 0x77ec000 __kernel_phys_end+0x49ec000 r8 0x7f7fffffc000 r9 0x80 r10 0x1bdd24c26d0de25d r11 0x47dac554b346e1d3 r12 0x43e0 __ALIGN_SIZE+0x33e0 r13 0xfffffd806e5e0730 r14 0xffff800000cdd230 r15 0x4f30 __ALIGN_SIZE+0x3f30 rip 0xffffffff81be7f15 m_pool_used+0x45 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800021678960 ss 0x10 m_pool_used+0x45: divl %ecx,%eax ddb> show proc PROC (sshd) pid=468886 stat=onproc flags process=12 proc=0 pri=24, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff95c8,0xffff8000ffff42d8 process=0xffff8000ffff23f0 user=0xffff800021673000, vmspace=0xfffffd807f0135c0 estcpu=0, cpticks=0, pctcpu=0.8 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 74783 61952 14603 0 2 0 syz-executor.0 74783 183744 14603 0 3 0x4000080 fsleep syz-executor.0 86695 333935 10489 0 2 0 syz-executor.4 86695 374660 10489 0 3 0x4000080 fsleep syz-executor.4 39808 322268 76779 0 2 0 syz-executor.3 39808 74629 76779 0 3 0x4000080 fsleep syz-executor.3 53960 132129 20765 0 2 0 syz-executor.5 53960 74883 20765 0 3 0x4000080 kqpoll syz-executor.5 53960 278049 20765 0 3 0x4000080 kqpoll syz-executor.5 53960 240129 20765 0 3 0x4000080 kqpoll syz-executor.5 82875 102314 0 0 3 0x14200 acct acct 10489 427271 26265 0 2 0x482 syz-executor.4 79352 25991 26265 0 2 0x2 syz-executor.1 14603 9573 26265 0 3 0x82 nanoslp syz-executor.0 2992 419725 26265 0 3 0x82 nanoslp syz-executor.7 15258 101469 1 0 3 0x100083 ttyin getty 20765 48367 26265 0 3 0x82 nanoslp syz-executor.5 28157 437027 26265 0 3 0x82 nanoslp syz-executor.6 76779 481367 26265 0 3 0x82 nanoslp syz-executor.3 58902 106432 26265 0 2 0x2 syz-executor.2 87468 373636 0 0 3 0x14280 nfsidl nfsio 62356 514263 0 0 3 0x14280 nfsidl nfsio 64554 145069 0 0 3 0x14280 nfsidl nfsio 6207 267434 0 0 3 0x14280 nfsidl nfsio 58416 204371 0 0 3 0x14280 nfsidl nfsio 42898 493677 0 0 3 0x14280 nfsidl nfsio 95152 139666 0 0 3 0x14280 nfsidl nfsio 43075 303849 0 0 3 0x14280 nfsidl nfsio 1098 208560 0 0 3 0x14280 nfsidl nfsio 82617 492756 0 0 3 0x14280 nfsidl nfsio 27156 243206 0 0 3 0x14280 nfsidl nfsio 70365 312591 0 0 3 0x14280 nfsidl nfsio 7236 480680 0 0 3 0x14280 nfsidl nfsio 46801 299980 0 0 3 0x14280 nfsidl nfsio 85293 99413 0 0 3 0x14280 nfsidl nfsio 79635 250394 0 0 3 0x14280 nfsidl nfsio 66869 377292 0 0 3 0x14280 nfsidl nfsio 31226 263243 0 0 3 0x14280 nfsidl nfsio 30160 430539 0 0 3 0x14280 nfsidl nfsio 41206 162207 0 0 3 0x14280 nfsidl nfsio 12805 444849 0 0 3 0x14200 bored sosplice 26265 505466 53275 0 3 0x82 wait syz-fuzzer 26265 418768 53275 0 3 0x4000082 nanoslp syz-fuzzer 26265 374562 53275 0 3 0x4000082 thrsleep syz-fuzzer 26265 348225 53275 0 3 0x4000082 wait syz-fuzzer 26265 20126 53275 0 3 0x4000082 thrsleep syz-fuzzer 26265 451913 53275 0 3 0x4000082 wait syz-fuzzer 26265 505856 53275 0 3 0x4000082 thrsleep syz-fuzzer 26265 473236 53275 0 3 0x4000082 wait syz-fuzzer 26265 117362 53275 0 3 0x4000082 wait syz-fuzzer 26265 155785 53275 0 3 0x4000082 thrsleep syz-fuzzer 26265 433842 53275 0 2 0x4000002 syz-fuzzer 26265 243200 53275 0 3 0x4000082 thrsleep syz-fuzzer 26265 10704 53275 0 3 0x4000082 wait syz-fuzzer 26265 326387 53275 0 3 0x4000082 wait syz-fuzzer 26265 184640 53275 0 3 0x4000082 wait syz-fuzzer 53275 472359 70073 0 3 0x10008a sigsusp ksh *70073 468886 26003 0 7 0x12 sshd 26003 300258 1 0 3 0x88 kqread sshd 58018 239610 88853 73 3 0x1100090 kqread syslogd 88853 423942 1 0 3 0x100082 netio syslogd 15622 391590 1 0 3 0x100080 kqread resolvd 28526 364349 0 0 3 0x14200 bored smr 29032 373923 0 0 2 0x14200 zerothread 57100 408788 0 0 3 0x14200 aiodoned aiodoned 6773 471801 0 0 3 0x14200 syncer update 21980 402786 0 0 3 0x14200 cleaner cleaner 21019 470411 0 0 3 0x14200 reaper reaper 15057 108412 0 0 3 0x14200 pgdaemon pagedaemon 3329 468990 0 0 3 0x14200 bored viomb 60874 350603 0 0 3 0x40014200 acpi0 acpi0 56176 385316 0 0 3 0x14200 bored softnet3 29253 292551 0 0 3 0x14200 bored softnet2 50835 285085 0 0 3 0x14200 bored softnet1 30713 242116 0 0 3 0x14200 bored softnet0 74888 208547 0 0 3 0x14200 bored systqmp 72024 491985 0 0 3 0x14200 bored systq 6366 475854 0 0 3 0x40014200 bored softclock 18060 222097 0 0 3 0x40014200 idle0 1 124322 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10186 6440K 6668K 78643K 15825 0 pcb 13 18K 22K 78643K 4168 0 rtable 224 17K 17K 78643K 3986 0 ifaddr 89 26K 28K 78643K 1696 0 sysctl 2 0K 0K 78643K 2 0 counters 30 17K 17K 78643K 1049 0 ioctlops 0 0K 4K 78643K 2470 0 iov 0 0K 24K 78643K 2482 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1667 104K 105K 78643K 9883 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 122 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 3780 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 15 53K 77K 78643K 17057 0 sigio 0 0K 0K 78643K 635 0 proc 65 43K 83K 78643K 2791 0 subproc 104 6K 7K 78643K 923 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 925 0 in_multi 84 5K 7K 78643K 1184 0 ether_multi 1 0K 0K 78643K 92 0 mrt 1 0K 0K 78643K 99 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 85 387K 387K 78643K 85 0 exec 0 0K 1K 78643K 3287 0 pfkey data 0 0K 0K 78643K 75 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 411 97K 112K 78643K 158800 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 591 0 NDP 17 0K 1K 78643K 533 0 temp 149 5858K 14054K 78643K 185589 0 kqueue 8 14K 24K 78643K 1622 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 2038 0 2037 24 23 1 3 0 8 0 rtentry 112 1165 0 1072 5 2 3 4 0 8 0 unpcb 144 31597 0 31590 237 231 6 15 0 8 5 syncache 296 112 0 112 33 33 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 132 0 132 23 23 0 1 0 8 0 tcpcb 776 8439 0 8433 247 239 8 15 0 8 6 arp 88 170 0 152 1 0 1 1 0 8 0 ipq 40 19 0 19 5 5 0 1 0 8 0 ipqe 40 120 0 120 5 5 0 1 0 8 0 inpcb 336 25854 0 25838 285 278 7 16 0 8 5 nd6 104 234 0 211 1 0 1 1 0 8 0 pkpcb 40 175 0 175 13 13 0 1 0 8 0 kcovpl 48 71 0 63 1 0 1 1 0 8 0 mppekey 1024 149 0 149 8 8 0 1 0 8 0 ppxss 1160 782 0 782 35 34 1 1 0 8 1 pppxif 1360 423 0 423 22 21 1 1 0 8 1 pfstscr 40 5 0 5 2 2 0 1 0 8 0 pfanchor 1288 376 0 0 32 0 32 32 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfqueue 264 4 0 0 1 0 1 1 0 8 0 pfstkey 128 10 0 10 2 2 0 1 0 8 0 pfstate 352 5 0 5 2 2 0 1 0 8 0 rttmr 136 22 0 22 9 9 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 4746 0 4327 67 40 27 32 0 8 0 art_table 32 4747 0 4327 6 2 4 5 0 8 0 art_node 16 1064 0 983 1 0 1 1 0 8 0 sysvmsgpl 40 39 0 18 1 0 1 1 0 8 0 semapl 112 3777 0 3767 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 23723 0 22204 95 0 95 95 0 8 0 ffsino 240 23723 0 22204 90 0 90 90 0 8 0 nchpl 144 50303 0 49819 63 40 23 63 0 8 0 rtmask 32 7 0 7 3 2 1 1 0 8 1 uvmvnodes 80 6220 0 0 127 0 127 127 0 8 0 vnodes 216 6220 0 0 346 0 346 346 0 8 0 namei 1024 215880 0 215880 13 12 1 3 0 8 1 kstatmem 264 772 0 738 10 7 3 3 0 8 0 scsiplug 72 22 0 22 7 7 0 1 0 8 0 scxspl 216 144601 0 144601 48 47 1 8 0 8 1 plimitpl 152 2976 0 2961 1 0 1 1 0 8 0 sigapl 424 17273 0 17211 10 2 8 8 0 8 0 futexpl 64 191501 0 191498 4 3 1 1 0 8 0 knotepl 120 332251 0 332186 222 218 4 19 0 8 0 kqueuepl 184 4703 0 4692 50 49 1 5 0 8 0 pipepl 288 5863 0 5834 123 116 7 11 0 8 4 fdescpl 432 17211 0 17188 4 1 3 4 0 8 0 filepl 120 163512 0 163286 253 237 16 21 0 8 8 lockfpl 104 4590 0 4589 11 9 2 2 0 8 1 lockfspl 48 1195 0 1194 1 0 1 1 0 8 0 sessionpl 144 90 0 75 1 0 1 1 0 8 0 pgrppl 48 365 0 350 1 0 1 1 0 8 0 ucredpl 104 19127 0 19117 1 0 1 1 0 8 0 zombiepl 144 17213 0 17211 6 5 1 1 0 8 0 processpl 1008 17273 0 17211 13 4 9 9 0 8 0 procpl 696 42949 0 42867 21 12 9 10 0 8 0 sosppl 168 122 0 122 26 26 0 1 0 8 0 sockpl 456 59699 0 59683 1377 1366 11 54 0 8 8 mcl64k 65536 779 0 779 45 44 1 1 0 8 1 mcl16k 16384 335 0 335 45 44 1 1 0 8 1 mcl12k 12288 699 0 699 38 37 1 1 0 8 1 mcl9k 9216 280 0 280 52 51 1 1 0 8 1 mcl8k 8192 951 0 951 37 36 1 1 0 8 1 mcl4k 4096 2175 0 2175 22 21 1 1 0 8 1 mcl2k2 2112 149 0 149 53 52 1 1 0 8 1 mcl2k 2048 104870 0 104825 77 70 7 38 0 8 1 mtagpl 96 173 0 173 9 9 0 2 0 8 0 mbufpl 256 405541 0 405413 2372 2349 23 411 0 8 8 bufpl 288 35231 0 28843 457 0 457 457 0 8 0 anonpl 24 1725281 0 1710123 235 125 110 139 0 188 0 amapchunkpl 152 514055 0 513211 136 92 44 55 0 158 0 amappl16 200 32774 0 32295 168 141 27 52 0 8 0 amappl15 192 10 0 10 1 1 0 1 0 8 0 amappl14 184 362 0 353 2 1 1 2 0 8 0 amappl13 176 31 0 30 1 0 1 1 0 8 0 amappl12 168 18756 0 18732 2 0 2 2 0 8 0 amappl11 160 55 0 50 1 0 1 1 0 8 0 amappl10 152 106 0 96 1 0 1 1 0 8 0 amappl9 144 208 0 208 31 30 1 2 0 8 1 amappl8 136 855 0 714 5 0 5 5 0 8 0 amappl7 128 136 0 115 1 0 1 1 0 8 0 amappl6 120 733 0 713 2 1 1 2 0 8 0 amappl5 112 642 0 639 1 0 1 1 0 8 0 amappl4 104 1593 0 1557 15 13 2 2 0 8 0 amappl3 96 99133 0 99063 7 4 3 3 0 8 0 amappl2 88 17847 0 17799 4 2 2 3 0 8 0 amappl1 80 74493 0 74086 22 12 10 22 0 8 0 amappl 88 157378 0 157151 8 2 6 7 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 17211 0 17188 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 17211 0 17188 1 0 1 1 0 8 0 vmmpekpl 168 133047 0 132994 5 1 4 4 0 8 0 vmmpepl 168 1032071 0 1029968 386 271 115 148 0 357 1 vmsppl 368 17210 0 17188 3 0 3 3 0 8 0 rwobjpl 24 241208 0 233447 50 3 47 49 0 8 0 pdppl 4096 34429 0 34376 965 906 59 71 0 8 6 pvpl 32 4749365 0 4729092 622 438 184 361 0 265 0 pmappl 216 17210 0 17188 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 4733 0 3947 35 9 26 29 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace m_pool_used() at m_pool_used+0x45 sys/kern/uipc_mbuf.c:1502 sbchecklowmem() at sbchecklowmem+0x21 sys/kern/uipc_socket2.c:642 tcp_update_sndspace(ffff800000cdd230) at tcp_update_sndspace+0x43 sys/netinet/tcp_usrreq.c:1527 tcp_output(ffff800000cdd230) at tcp_output+0x24cc sys/netinet/tcp_output.c:1029 tcp_send(fffffd806e5e0730,fffffd8071d0e100,0,0) at tcp_send+0xf5 sys/netinet/tcp_usrreq.c:849 sosend(fffffd806e5e0730,0,ffff800021678db8,0,0,80) at sosend+0x66d dofilewritev(ffff8000ffff8da0,4,ffff800021678db8,0,ffff800021678ea0) at dofilewritev+0x1a0 sys/kern/sys_generic.c:375 sys_write(ffff8000ffff8da0,ffff800021678e50,ffff800021678ea0) at sys_write+0x87 sys/kern/sys_generic.c:295 syscall(ffff800021678f20) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:632 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x763e63e32780, count: -10 ddb> machine ddbcpu 1 No such command ddb> trace m_pool_used() at m_pool_used+0x45 sys/kern/uipc_mbuf.c:1502 sbchecklowmem() at sbchecklowmem+0x21 sys/kern/uipc_socket2.c:642 tcp_update_sndspace(ffff800000cdd230) at tcp_update_sndspace+0x43 sys/netinet/tcp_usrreq.c:1527 tcp_output(ffff800000cdd230) at tcp_output+0x24cc sys/netinet/tcp_output.c:1029 tcp_send(fffffd806e5e0730,fffffd8071d0e100,0,0) at tcp_send+0xf5 sys/netinet/tcp_usrreq.c:849 sosend(fffffd806e5e0730,0,ffff800021678db8,0,0,80) at sosend+0x66d dofilewritev(ffff8000ffff8da0,4,ffff800021678db8,0,ffff800021678ea0) at dofilewritev+0x1a0 sys/kern/sys_generic.c:375 sys_write(ffff8000ffff8da0,ffff800021678e50,ffff800021678ea0) at sys_write+0x87 sys/kern/sys_generic.c:295 syscall(ffff800021678f20) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:632 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x763e63e32780, count: -10