g g g g panic: : ool_Nache_iteR_D gic_check: mbufpl cpu f ee l i sStopped at savectx+0xb1: movl $0,%gs:0x530 TID PID UID PRFLAGS PFLAGS CPU COMMAND *122232 2738 0 0 0 0 syz-executor.0 246068 87954 0 0x12 0 1 sshd savectx(6,73958520000,9,c6,7394edbe130,7394edbe1c8) at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffce5f0, count: 14 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 pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd807430f600+24 0xef5ec75ebdcbd12f!=0x10a13adedbcb302f ddb{0}> trace savectx(6,73958520000,9,c6,7394edbe130,7394edbe1c8) at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffce5f0, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800020b397c0 rbx 0 rdx 0xffff800020acec78 rcx 0 rax 0x35 r8 0xffffffff8165462f kprintf+0x16f r9 0x1 r10 0x25 r11 0xbc10e21e65e5256 r12 0 r13 0 r14 0xffff800020acec78 r15 0 rip 0xffffffff81df23f1 savectx+0xb1 cs 0x8 rflags 0x46 rsp 0xffff800020b39740 ss 0x10 savectx+0xb1: movl $0,%gs:0x530 ddb{0}> show proc PROC (syz-executor.0) pid=122232 stat=onproc flags process=0 proc=0 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab0ee8,0xffffffff8267a4c0 process=0xffff800020add180 user=0xffff800020b34000, vmspace=0xfffffd807f00b170 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND * 2738 122232 18334 0 7 0 syz-executor.0 66658 180312 1 0 3 0x82 nanosleep getty 24727 341735 86577 0 2 0x2 syz-executor.1 18334 452572 86577 0 3 0x82 nanosleep syz-executor.0 19712 57312 0 0 3 0x14200 acct acct 77381 364603 0 0 3 0x14200 bored sosplice 86577 350119 30529 0 3 0x82 thrsleep syz-fuzzer 86577 216684 30529 0 3 0x4000082 nanosleep syz-fuzzer 86577 455633 30529 0 3 0x4000082 thrsleep syz-fuzzer 86577 255307 30529 0 3 0x4000082 thrsleep syz-fuzzer 86577 190692 30529 0 3 0x4000082 thrsleep syz-fuzzer 86577 256755 30529 0 3 0x4000082 kqread syz-fuzzer 86577 357983 30529 0 3 0x4000082 thrsleep syz-fuzzer 86577 289304 30529 0 3 0x4000082 thrsleep syz-fuzzer 86577 152282 30529 0 3 0x4000082 thrsleep syz-fuzzer 86577 389829 30529 0 3 0x4000082 nanosleep syz-fuzzer 30529 249501 87954 0 3 0x10008a pause ksh 87954 246068 46497 0 7 0x12 sshd 46497 501890 1 0 3 0x80 select sshd 48670 440112 63191 74 3 0x100092 bpf pflogd 63191 67447 1 0 3 0x80 netio pflogd 89079 518368 25647 73 3 0x100090 kqread syslogd 25647 173142 1 0 3 0x100082 netio syslogd 55904 121460 1 77 3 0x100090 poll dhclient 67404 399830 1 0 3 0x80 poll dhclient 70943 207575 0 0 2 0x14200 zerothread 61857 187106 0 0 3 0x14200 aiodoned aiodoned 42033 185634 0 0 3 0x14200 syncer update 11170 143738 0 0 3 0x14200 cleaner cleaner 68647 150950 0 0 3 0x14200 reaper reaper 74688 35992 0 0 3 0x14200 pgdaemon pagedaemon 89237 203805 0 0 3 0x14200 bored crynlk 51963 137474 0 0 3 0x14200 bored crypto 70227 513062 0 0 3 0x40014200 acpi0 acpi0 93307 102002 0 0 3 0x40014200 idle1 90855 104100 0 0 3 0x14200 bored softnet 94526 365550 0 0 3 0x14200 bored systqmp 33210 383338 0 0 3 0x14200 bored systq 47818 165500 0 0 3 0x40014200 bored softclock 61197 68498 0 0 3 0x40014200 idle0 63699 105322 0 0 3 0x14200 bored smr 1 198453 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 2738 (syz-executor.0) thread 0xffff800020acec78 (122232) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82638a30) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:83 [inline] #1 syscall+0x400 sys/arch/amd64/amd64/trap.c:555 #2 Xsyscall+0x128 Process 87954 (sshd) thread 0xffff800020ac0c68 (246068) exclusive rwlock netlock r = 0 (0xffffffff8248f918) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 solock+0x5a sys/kern/uipc_socket2.c:282 #2 sosend+0x51b sys/kern/uipc_socket.c:512 #3 dofilewritev+0x1b7 sys/kern/sys_generic.c:364 #4 sys_write+0x83 sys/kern/sys_generic.c:284 #5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #6 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9682 6753K 9051K 78643K 62414 0 0 pcb 13 13K 15K 78643K 2036 0 0 rtable 141 15K 18K 78643K 5524 0 0 ifaddr 123 30K 32K 78643K 1626 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1900 0 0 iov 0 0K 32K 78643K 4949 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1226 77K 78K 78643K 16261 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 103 0 0 VM map 54 27K 27K 78643K 81 0 0 sem 12 0K 1K 78643K 2914 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 9337 0 0 sigio 0 0K 0K 78643K 125 0 0 proc 62 63K 95K 78643K 3882 0 0 subproc 32 2K 2K 78643K 1098 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 1K 78643K 950 0 0 in_multi 34 2K 3K 78643K 1309 0 0 ether_multi 1 0K 0K 78643K 138 0 0 mrt 2 0K 0K 78643K 75 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 174 768K 768K 78643K 174 0 0 exec 0 0K 1K 78643K 1971 0 0 pfkey data 0 0K 4K 78643K 2 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 217 355K 359K 78643K 33965 0 0 UVM aobj 130 4K 4K 78643K 130 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 1K 78643K 2204 0 0 NDP 27 0K 1K 78643K 520 0 0 temp 277 3566K 4205K 78643K 339080 0 0 kqueue 0 0K 0K 78643K 89 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 171 0 166 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 1006 0 1004 1 0 1 1 0 8 0 rtentry 112 1060 0 1007 2 0 2 2 0 8 0 unpcb 120 6388 0 6368 19 18 1 2 0 8 0 syncache 264 44 0 44 19 19 0 1 0 8 0 tcpqe 32 21 0 21 8 8 0 1 0 8 0 tcpcb 544 10306 0 10302 54 53 1 12 0 8 0 inpcb 280 21671 0 21664 84 82 2 13 0 8 1 rttmr 72 27 0 26 9 8 1 1 0 8 0 ip6q 72 10 0 10 6 6 0 1 0 8 0 ip6af 40 25 0 25 6 6 0 1 0 8 0 nd6 48 165 0 163 2 1 1 1 0 8 0 pkpcb 40 39 0 39 13 13 0 1 0 8 0 swfcl 56 4 0 0 1 0 1 1 0 8 0 ppxss 1128 241 0 241 24 24 0 1 0 8 0 pffrag 232 304 0 304 23 22 1 1 0 482 1 pffrnode 88 304 0 304 23 22 1 1 0 8 1 pffrent 40 11141 0 11141 23 22 1 1 0 8 1 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 822 0 749 1 0 1 1 0 8 0 pfstkey 112 822 0 749 3 0 3 3 0 8 0 pfstate 328 822 0 749 12 4 8 9 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 63 0 60 23 20 3 4 0 8 0 art_heap4 256 5083 0 4815 56 37 19 22 0 8 1 art_table 32 5146 0 4875 3 0 3 3 0 8 0 art_node 16 1052 0 1012 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 4 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 2912 0 2902 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 dino1pl 128 15361 0 13903 49 1 48 48 0 8 0 ffsino 272 15361 0 13903 98 0 98 98 0 8 0 nchpl 144 30652 0 30146 63 37 26 62 0 8 0 uvmvnodes 72 7753 0 0 141 0 141 141 0 8 0 vnodes 208 7753 0 0 409 0 409 409 0 8 0 namei 1024 117230 0 117230 4 3 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 53 0 1 7 0 7 7 0 8 0 vmpool 552 79 0 27 4 0 4 4 0 8 0 scsiplug 64 11 0 11 8 8 0 1 0 8 0 scxspl 192 96842 0 96842 67 66 1 4 0 8 1 plimitpl 152 839 0 831 1 0 1 1 0 8 0 sigapl 432 9356 0 9341 4 2 2 3 0 8 0 futexpl 56 239080 0 239080 4 3 1 1 0 8 1 knotepl 112 2027 0 2008 7 6 1 3 0 8 0 kqueuepl 104 2535 0 2533 4 3 1 4 0 8 0 pipepl 112 5678 0 5659 14 13 1 2 0 8 0 fdescpl 488 9357 0 9341 3 0 3 3 0 8 0 filepl 152 96366 0 96267 80 74 6 14 0 8 2 lockfpl 104 3579 0 3578 1 0 1 1 0 8 0 lockfspl 48 1233 0 1232 1 0 1 1 0 8 0 sessionpl 112 86 0 76 1 0 1 1 0 8 0 pgrppl 48 203 0 193 1 0 1 1 0 8 0 ucredpl 96 12037 0 12027 1 0 1 1 0 8 0 zombiepl 144 9345 0 9345 3 2 1 1 0 8 1 processpl 896 9378 0 9345 5 1 4 5 0 8 0 procpl 632 29815 0 29773 5 0 5 5 0 8 0 srpgc 64 138 0 138 29 29 0 1 0 8 0 sosppl 128 162 0 162 27 27 0 1 0 8 0 sockpl 384 29351 0 29320 129 123 6 23 0 8 1 mcl64k 65536 696 0 0 82 32 50 66 0 8 0 mcl16k 16384 41 0 0 5 2 3 3 0 8 1 mcl12k 12288 35 0 0 2 0 2 2 0 8 0 mcl9k 9216 39 0 0 2 0 2 2 0 8 0 mcl8k 8192 37 0 0 4 1 3 3 0 8 0 mcl4k 4096 57 0 0 5 2 3 3 0 8 0 mcl2k2 2112 12 0 0 1 0 1 1 0 8 0 mcl2k 2048 230 0 0 21 7 14 21 0 8 2 mtagpl 80 270 0 0 4 1 3 4 0 8 0 mbufpl 256 1384 0 0 52 0 52 52 0 8 0 bufpl 256 40567 0 32813 485 0 485 485 0 8 0 anonpl 16 1159409 0 1136898 265 158 107 107 0 124 8 amapchunkpl 152 69722 0 69561 127 118 9 21 0 158 1 amappl16 192 50517 0 49182 313 234 79 79 0 8 8 amappl15 184 2689 0 2687 9 8 1 1 0 8 0 amappl14 176 2171 0 2161 1 0 1 1 0 8 0 amappl13 168 1446 0 1444 1 0 1 1 0 8 0 amappl12 160 661 0 657 1 0 1 1 0 8 0 amappl11 152 895 0 880 1 0 1 1 0 8 0 amappl10 144 758 0 750 1 0 1 1 0 8 0 amappl9 136 2810 0 2805 1 0 1 1 0 8 0 amappl8 128 2406 0 2333 3 0 3 3 0 8 0 amappl7 120 1066 0 1057 1 0 1 1 0 8 0 amappl6 112 736 0 725 1 0 1 1 0 8 0 amappl5 104 1319 0 1304 1 0 1 1 0 8 0 amappl4 96 9749 0 9713 1 0 1 1 0 8 0 amappl3 88 2179 0 2167 1 0 1 1 0 8 0 amappl2 80 72710 0 72634 3 0 3 3 0 8 0 amappl1 72 220354 0 219922 25 15 10 20 0 8 0 amappl 80 31301 0 31235 2 0 2 2 0 84 0 dma4096 4096 1 0 1 1 1 0 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 17 0 17 1 1 0 1 0 8 0 aobjpl 64 129 0 0 3 0 3 3 0 8 0 uaddrrnd 24 9436 0 9341 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 9436 0 9341 1 0 1 1 0 8 0 vmmpekpl 168 72307 0 72262 4 1 3 3 0 8 0 vmmpepl 168 1211288 0 1208579 436 270 166 172 0 357 37 vmsppl 368 9356 0 9341 2 0 2 2 0 8 0 pdppl 4096 18879 0 18788 16 4 12 12 0 8 0 pvpl 32 2992433 0 2969263 547 320 227 234 0 265 28 pmappl 232 9435 0 9368 7 2 5 5 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 914 0 164 22 0 22 22 0 8 0