panic: pool_cache_item_magic_check: mbufppaln icpcu: fkreeren elli stdi amgonodistfiiecd a: sisteretmi aond dr" !_0xkeffrnfeffl_d8l0o6ck5a_h33edl0d(0)+2"4 f a0ixlfe58df: 4f9iclc7e4 "f/9s3dyazk2a!=l0lxerf5/8mfa4n9a4gce1r9as/e9mufalt2i coStopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 247703 21858 0 0 0x4000000 1 syz-executor.1 *198635 54958 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821c40bb) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82641a78) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1789 [inline] pool_cache_get(ffffffff82641a78) at pool_cache_get+0x323 sys/kern/subr_pool.c:1892 pool_get(ffffffff82641a78,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_copym(fffffd807934e100,7094,5a0,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copym(fffffd807934e100,7094,5a0,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667 ip_fragment(fffffd807934e100,ffff8000001732a8,5b4) at ip_fragment+0x324 ip_output(fffffd807934e100,0,fffffd806f66cc78,0,0,fffffd806f66cc08) at ip_output+0xfc1 sys/netinet/ip_output.c:501 udp_output(fffffd806f66cc08,fffffd807934e100,0,0) at udp_output+0x5af sys/netinet/udp_usrreq.c:1008 sosend(fffffd80793c1020,0,ffff800023bbd1a0,0,0,0) at sosend+0x645 sys/kern/uipc_socket.c:524 sendit(ffff800020ac0508,9,ffff800023bbd280,0,ffff800023bbd360) at sendit+0x52b sys/kern/uipc_syscalls.c:662 sys_sendto(ffff800020ac0508,ffff800023bbd318,ffff800023bbd360) at sys_sendto+0x80 sys/kern/uipc_syscalls.c:527 syscall(ffff800023bbd3e0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023bbd3e0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x20a5be211c0, count: 2 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 0xfffffd8065a33d00+24 0xf58f49cc74f93da2!=0xf58f494c19ae9fa2 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821c40bb) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82641a78) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1789 [inline] pool_cache_get(ffffffff82641a78) at pool_cache_get+0x323 sys/kern/subr_pool.c:1892 pool_get(ffffffff82641a78,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_copym(fffffd807934e100,7094,5a0,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copym(fffffd807934e100,7094,5a0,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667 ip_fragment(fffffd807934e100,ffff8000001732a8,5b4) at ip_fragment+0x324 ip_output(fffffd807934e100,0,fffffd806f66cc78,0,0,fffffd806f66cc08) at ip_output+0xfc1 sys/netinet/ip_output.c:501 udp_output(fffffd806f66cc08,fffffd807934e100,0,0) at udp_output+0x5af sys/netinet/udp_usrreq.c:1008 sosend(fffffd80793c1020,0,ffff800023bbd1a0,0,0,0) at sosend+0x645 sys/kern/uipc_socket.c:524 sendit(ffff800020ac0508,9,ffff800023bbd280,0,ffff800023bbd360) at sendit+0x52b sys/kern/uipc_syscalls.c:662 sys_sendto(ffff800020ac0508,ffff800023bbd318,ffff800023bbd360) at sys_sendto+0x80 sys/kern/uipc_syscalls.c:527 syscall(ffff800023bbd3e0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023bbd3e0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x20a5be211c0, count: -13 ddb{0}> show registers rdi 0xffffffff8152d6e7 db_enter+0x17 rsi 0x983d __ALIGN_SIZE+0x883d rbp 0xffff800023bbcbb0 rbx 0xffff800023bbcc60 rdx 0x983e __ALIGN_SIZE+0x883e rcx 0xffff800021d86000 rax 0xffff800021d86000 r8 0xffffffff81b4ee6f kprintf+0x16f r9 0x1 r10 0x25 r11 0x68125ceaad4418a4 r12 0x3000000008 r13 0xffff800023bbcbc0 r14 0x100 r15 0x1 rip 0xffffffff8152d6e8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023bbcba0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=198635 stat=onproc flags process=0 proc=4000000 pri=81, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff800020ac0c70,0xffff800020ac02a0 process=0xffff800020aece00 user=0xffff800023bb8000, vmspace=0xfffffd80793342f0 estcpu=36, cpticks=4, pctcpu=0.0 user=0, sys=3, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 21858 87762 89175 0 2 0 syz-executor.1 21858 247703 89175 0 7 0x4000000 syz-executor.1 54958 208111 17552 0 2 0 syz-executor.0 *54958 198635 17552 0 7 0x4000000 syz-executor.0 17552 109631 99321 0 3 0x82 nanosleep syz-executor.0 13643 99574 0 0 3 0x14200 acct acct 29425 26735 0 0 3 0x14200 bored sosplice 89175 20001 99321 0 3 0x82 nanosleep syz-executor.1 99321 467431 28945 0 3 0x82 thrsleep syz-fuzzer 99321 169452 28945 0 3 0x4000082 thrsleep syz-fuzzer 99321 152178 28945 0 3 0x4000082 thrsleep syz-fuzzer 99321 390353 28945 0 3 0x4000082 thrsleep syz-fuzzer 99321 225516 28945 0 3 0x4000082 thrsleep syz-fuzzer 99321 137860 28945 0 3 0x4000082 thrsleep syz-fuzzer 99321 399302 28945 0 3 0x4000082 thrsleep syz-fuzzer 99321 485552 28945 0 3 0x4000082 thrsleep syz-fuzzer 99321 451087 28945 0 3 0x4000082 thrsleep syz-fuzzer 99321 247086 28945 0 3 0x4000082 kqread syz-fuzzer 99321 343668 28945 0 3 0x4000082 thrsleep syz-fuzzer 28945 377312 18576 0 3 0x10008a pause ksh 18576 157144 71559 0 3 0x92 select sshd 75065 82576 1 0 3 0x100083 ttyin getty 71559 349002 1 0 3 0x80 select sshd 9683 292164 38881 74 3 0x100092 bpf pflogd 38881 29034 1 0 3 0x80 netio pflogd 66128 55805 24946 73 3 0x100090 kqread syslogd 24946 157740 1 0 3 0x100082 netio syslogd 68040 372143 1 77 3 0x100090 poll dhclient 55526 379181 1 0 3 0x80 poll dhclient 36066 267504 0 0 2 0x14200 zerothread 51400 253190 0 0 3 0x14200 aiodoned aiodoned 59028 509223 0 0 3 0x14200 syncer update 9471 415498 0 0 3 0x14200 cleaner cleaner 58333 477379 0 0 3 0x14200 reaper reaper 92230 28385 0 0 3 0x14200 pgdaemon pagedaemon 96953 142153 0 0 3 0x14200 bored crynlk 62830 80358 0 0 3 0x14200 bored crypto 14357 396637 0 0 3 0x40014200 acpi0 acpi0 90809 164416 0 0 3 0x40014200 idle1 62945 392715 0 0 3 0x14200 bored softnet 24957 465068 0 0 3 0x14200 bored systqmp 90552 199670 0 0 3 0x14200 bored systq 41063 95848 0 0 3 0x40014200 bored softclock 22298 7261 0 0 3 0x40014200 idle0 4097 226521 0 0 3 0x14200 bored smr 1 284813 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 54958 (syz-executor.0) thread 0xffff800020ac0508 (198635) exclusive rwlock netlock r = 0 (0xffffffff824aa9f8) #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 sendit+0x52b sys/kern/uipc_syscalls.c:662 #4 sys_sendto+0x80 sys/kern/uipc_syscalls.c:527 #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 devbuf 9598 6837K 7844K 78643K 12611 0 pcb 13 8K 8K 78643K 184 0 rtable 105 4K 4K 78643K 570 0 ifaddr 109 20K 21K 78643K 319 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1510 0 iov 0 0K 32K 78643K 178 0 mount 1 1K 1K 78643K 1 0 vnodes 1234 78K 78K 78643K 1970 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 22 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 237 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 6 17K 25K 78643K 802 0 sigio 1 0K 0K 78643K 101 0 proc 61 63K 95K 78643K 589 0 subproc 32 2K 2K 78643K 68 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 301 0 in_multi 130 5K 6K 78643K 263 0 ether_multi 1 0K 0K 78643K 5 0 mrt 0 0K 0K 78643K 7 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 96 424K 424K 78643K 96 0 exec 0 0K 1K 78643K 345 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 162 137K 138K 78643K 3865 0 UVM aobj 113 8K 8K 78643K 115 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 134 0 NDP 18 0K 0K 78643K 61 0 temp 164 3024K 3097K 78643K 21486 0 kqueue 0 0K 0K 78643K 6 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 arp 64 12 0 6 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 70 0 68 1 0 1 1 0 8 0 rtentry 112 84 0 43 2 0 2 2 0 8 0 unpcb 120 1256 0 1244 2 1 1 2 0 8 0 syncache 264 12 0 12 4 3 1 1 0 8 1 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 122 0 122 3 2 1 1 0 8 1 tcpcb 544 377 0 373 3 2 1 2 0 8 0 inpcb 280 1968 0 1958 5 3 2 4 0 8 1 rttmr 72 3 0 3 2 2 0 1 0 8 0 nd6 48 11 0 8 1 0 1 1 0 8 0 pkpcb 40 8 0 8 2 2 0 1 0 8 0 swfcl 56 2 0 0 1 0 1 1 0 8 0 ppxss 1128 29 0 29 2 1 1 1 0 8 1 pffrag 232 28 0 28 4 3 1 1 0 482 1 pffrnode 88 28 0 28 4 3 1 1 0 8 1 pffrent 40 1053 0 1053 3 2 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 79 0 23 1 0 1 1 0 8 0 pfstkey 112 79 0 23 2 0 2 2 0 8 0 pfstate 328 79 0 23 5 0 5 5 0 8 0 pfrule 1360 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 256 390 0 179 16 2 14 15 0 8 0 art_table 32 391 0 179 2 0 2 2 0 8 0 art_node 16 83 0 45 1 0 1 1 0 8 0 sysvmsgpl 40 53 0 28 1 0 1 1 0 8 0 semupl 112 5 0 5 2 2 0 1 0 8 0 semapl 112 235 0 225 1 0 1 1 0 8 0 shmpl 112 113 0 2 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2740 0 1327 46 0 46 46 0 8 0 ffsino 272 2740 0 1327 95 0 95 95 0 8 0 nchpl 144 4330 0 2711 61 0 61 61 0 8 0 uvmvnodes 72 3263 0 0 60 0 60 60 0 8 0 vnodes 208 3263 0 0 172 0 172 172 0 8 0 namei 1024 15155 0 15155 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 10 0 0 2 0 2 2 0 8 0 vmpool 560 14 0 4 1 0 1 1 0 8 0 scxspl 192 13122 0 13121 11 10 1 7 0 8 0 plimitpl 152 77 0 69 1 0 1 1 0 8 0 sigapl 432 995 0 979 3 1 2 3 0 8 0 futexpl 56 20994 0 20994 1 0 1 1 0 8 1 knotepl 112 201 0 182 1 0 1 1 0 8 0 kqueuepl 104 232 0 230 1 0 1 1 0 8 0 pipepl 160 686 0 667 3 1 2 2 0 8 1 fdescpl 488 996 0 979 3 0 3 3 0 8 0 filepl 152 9608 0 9501 9 3 6 7 0 8 1 lockfpl 104 374 0 371 1 0 1 1 0 8 0 lockfspl 48 129 0 126 1 0 1 1 0 8 0 sessionpl 112 20 0 9 1 0 1 1 0 8 0 pgrppl 48 34 0 23 1 0 1 1 0 8 0 ucredpl 96 1503 0 1494 1 0 1 1 0 8 0 zombiepl 144 979 0 979 1 0 1 1 0 8 1 processpl 896 1013 0 979 4 0 4 4 0 8 0 procpl 632 2908 0 2862 5 0 5 5 0 8 1 srpgc 64 4 0 4 1 1 0 1 0 8 0 sosppl 128 29 0 29 5 4 1 1 0 8 1 sockpl 384 3317 0 3293 9 4 5 7 0 8 2 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 13 0 0 2 0 2 2 0 8 0 mcl9k 9216 7 0 0 1 0 1 1 0 8 0 mcl8k 8192 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 18 0 0 3 0 3 3 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 178 0 0 22 0 22 22 0 8 0 mtagpl 80 27 0 0 1 0 1 1 0 8 0 mbufpl 256 425 0 0 24 0 24 24 0 8 0 bufpl 280 9267 0 2197 506 0 506 506 0 8 0 anonpl 16 114617 0 93829 105 18 87 94 0 125 3 amapchunkpl 152 6571 0 6410 18 11 7 14 0 158 0 amappl16 192 4780 0 3629 69 9 60 65 0 8 2 amappl15 184 319 0 315 1 0 1 1 0 8 0 amappl14 176 41 0 37 1 0 1 1 0 8 0 amappl13 168 190 0 188 1 0 1 1 0 8 0 amappl12 160 369 0 363 1 0 1 1 0 8 0 amappl11 152 62 0 46 1 0 1 1 0 8 0 amappl10 144 80 0 73 1 0 1 1 0 8 0 amappl9 136 636 0 632 1 0 1 1 0 8 0 amappl8 128 174 0 134 2 0 2 2 0 8 0 amappl7 120 177 0 166 1 0 1 1 0 8 0 amappl6 112 62 0 53 1 0 1 1 0 8 0 amappl5 104 519 0 503 1 0 1 1 0 8 0 amappl4 96 1092 0 1061 1 0 1 1 0 8 0 amappl3 88 522 0 511 1 0 1 1 0 8 0 amappl2 80 7108 0 7023 3 1 2 3 0 8 0 amappl1 72 32241 0 31777 25 15 10 20 0 8 0 amappl 80 3214 0 3160 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 18 0 17 1 0 1 1 0 8 0 aobjpl 64 114 0 2 2 0 2 2 0 8 0 uaddrrnd 24 1010 0 983 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1010 0 983 1 0 1 1 0 8 0 vmmpekpl 168 12346 0 12311 2 0 2 2 0 8 0 vmmpepl 168 131436 0 128933 170 44 126 146 0 357 16 vmsppl 368 1009 0 983 3 0 3 3 0 8 0 pdppl 4096 2027 0 1976 7 0 7 7 0 8 0 pvpl 32 345039 0 320956 226 27 199 219 0 265 4 pmappl 232 1009 0 983 3 1 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 187 0 7 6 0 6 6 0 8 0