panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806d7b7e00+16 0x0!=0x7cb59f8f35ba7313 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 346900 57923 0 0 0x4000000 0 syz-executor.0 * 22964 57756 74 0x100012 0 1K pflogd db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82673af0) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1789 [inline] pool_cache_get(ffffffff82673af0) at pool_cache_get+0x323 sys/kern/subr_pool.c:1892 pool_get() at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(2,3) at m_get+0x4c sys/kern/uipc_mbuf.c:250 sbappendaddr(fffffd806e981d88,fffffd806e981e10,ffffffff8248aa38,fffffd807f02b600,0) at sbappendaddr+0x140 sys/kern/uipc_socket2.c:802 uipc_usrreq(fffffd806e981488,9,fffffd807f02b600,0,0,ffff800020ac0500) at uipc_usrreq+0xbb9 sys/kern/uipc_usrreq.c:238 sosend(fffffd806e981488,0,ffff800020aab950,0,0,0) at sosend+0x645 sys/kern/uipc_socket.c:524 dosendsyslog(ffff800020ac0500,7f7ffffd4370,3d,0,0) at dosendsyslog+0x2b8 sys/kern/subr_log.c:521 sys_sendsyslog() at sys_sendsyslog+0x13e sys/kern/subr_log.c:441 syscall(ffff800020aabbb0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800020aabbb0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,70,3d,70,1fee,295bc486038) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd68f0, count: 3 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806d7b7e00+16 0x0!=0x7cb59f8f35ba7313 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82673af0) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1789 [inline] pool_cache_get(ffffffff82673af0) at pool_cache_get+0x323 sys/kern/subr_pool.c:1892 pool_get() at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(2,3) at m_get+0x4c sys/kern/uipc_mbuf.c:250 sbappendaddr(fffffd806e981d88,fffffd806e981e10,ffffffff8248aa38,fffffd807f02b600,0) at sbappendaddr+0x140 sys/kern/uipc_socket2.c:802 uipc_usrreq(fffffd806e981488,9,fffffd807f02b600,0,0,ffff800020ac0500) at uipc_usrreq+0xbb9 sys/kern/uipc_usrreq.c:238 sosend(fffffd806e981488,0,ffff800020aab950,0,0,0) at sosend+0x645 sys/kern/uipc_socket.c:524 dosendsyslog(ffff800020ac0500,7f7ffffd4370,3d,0,0) at dosendsyslog+0x2b8 sys/kern/subr_log.c:521 sys_sendsyslog() at sys_sendsyslog+0x13e sys/kern/subr_log.c:441 syscall(ffff800020aabbb0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800020aabbb0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,70,3d,70,1fee,295bc486038) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd68f0, count: -12 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020aab4f0 rbx 0xffff800020aab5a0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff81ba769f kprintf+0x16f r9 0x1 r10 0x58ba841e29c89ed7 r11 0xad7e479013362e0b r12 0x3000000008 r13 0xffff800020aab500 r14 0x100 r15 0x1 rip 0xffffffff810273e8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020aab4e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (pflogd) pid=22964 stat=onproc flags process=100012 proc=0 pri=50, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020ac1158,0xffff800020ac13e0 process=0xffff800020adca80 user=0xffff800020aa6000, vmspace=0xfffffd806e7de738 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 57923 234093 76054 0 2 0 syz-executor.0 57923 346900 76054 0 7 0x4000000 syz-executor.0 76054 155077 36659 0 3 0x82 nanosleep syz-executor.0 36659 282768 91245 0 3 0x82 thrsleep syz-execprog 36659 497549 91245 0 3 0x4000082 nanosleep syz-execprog 36659 193757 91245 0 3 0x4000082 thrsleep syz-execprog 36659 496950 91245 0 3 0x4000082 thrsleep syz-execprog 36659 418287 91245 0 3 0x4000082 thrsleep syz-execprog 36659 403044 91245 0 3 0x4000082 thrsleep syz-execprog 36659 12865 91245 0 3 0x4000082 thrsleep syz-execprog 36659 330842 91245 0 3 0x4000082 thrsleep syz-execprog 36659 27040 91245 0 3 0x4000082 kqread syz-execprog 91245 17581 78224 0 3 0x10008a pause ksh 78224 396119 971 0 3 0x92 select sshd 53669 316665 1 0 3 0x100083 ttyin getty 971 316956 1 0 3 0x80 select sshd *57756 22964 63037 74 7 0x100012 pflogd 63037 217745 1 0 3 0x80 netio pflogd 31636 151902 19638 73 3 0x100090 kqread syslogd 19638 198185 1 0 3 0x100082 netio syslogd 91927 359256 1 77 3 0x100090 poll dhclient 56404 9633 1 0 3 0x80 poll dhclient 78562 225112 0 0 3 0x14200 pgzero zerothread 52739 370523 0 0 3 0x14200 aiodoned aiodoned 19881 216990 0 0 3 0x14200 syncer update 51193 315146 0 0 3 0x14200 cleaner cleaner 74969 204475 0 0 3 0x14200 reaper reaper 41012 254375 0 0 3 0x14200 pgdaemon pagedaemon 35599 82732 0 0 3 0x14200 bored crynlk 94295 394744 0 0 3 0x14200 bored crypto 49682 149102 0 0 3 0x40014200 acpi0 acpi0 22298 297103 0 0 3 0x40014200 idle1 6679 36656 0 0 3 0x14200 bored softnet 9260 61167 0 0 3 0x14200 bored systqmp 16536 524028 0 0 3 0x14200 bored systq 54266 25178 0 0 3 0x40014200 bored softclock 7594 133107 0 0 3 0x40014200 idle0 49427 386451 0 0 3 0x14200 bored smr 1 312490 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 57756 (pflogd) thread 0xffff800020ac0500 (22964) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff82624d88) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9457 6385K 6385K 78643K 10544 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 77 2K 2K 78643K 165 0 0 ifaddr 32 9K 9K 78643K 45 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1468 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1181 74K 74K 78643K 1186 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 2 0K 0K 78643K 2 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 3 8K 12K 78643K 31 0 0 proc 59 63K 83K 78643K 384 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 in_multi 22 1K 1K 78643K 22 0 0 ether_multi 1 0K 0K 78643K 1 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 18 79K 79K 78643K 18 0 0 exec 0 0K 1K 78643K 199 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 76 12K 12K 78643K 1001 0 0 UVM aobj 2 2K 2K 78643K 2 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 NDP 7 0K 0K 78643K 7 0 0 temp 48 3546K 3610K 78643K 3362 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 4 0 1 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 17 0 15 1 0 1 1 0 8 0 rtentry 112 34 0 4 1 0 1 1 0 8 0 unpcb 120 29 0 19 1 0 1 1 0 8 0 syncache 264 5 0 5 1 1 0 1 0 8 0 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 280 59 0 53 1 0 1 1 0 8 0 nd6 48 2 0 0 1 0 1 1 0 8 0 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 10 0 2 1 0 1 1 0 8 0 pfstkey 112 10 0 2 1 0 1 1 0 8 0 pfstate 328 10 0 2 1 0 1 1 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 256 167 0 2 11 0 11 11 0 8 0 art_table 32 168 0 2 2 0 2 2 0 8 0 art_node 16 33 0 6 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1435 0 33 46 0 46 46 0 8 0 ffsino 272 1435 0 33 94 0 94 94 0 8 0 nchpl 144 1687 0 76 60 0 60 60 0 8 0 uvmvnodes 72 1445 0 0 27 0 27 27 0 8 0 vnodes 208 1445 0 0 77 0 77 77 0 8 0 namei 1024 4194 0 4194 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 4345 0 4345 8 4 4 7 0 8 4 plimitpl 152 15 0 8 1 0 1 1 0 8 0 sigapl 432 239 0 225 2 0 2 2 0 8 0 futexpl 56 93 0 93 1 0 1 1 0 8 1 knotepl 112 39 0 28 1 0 1 1 0 8 0 kqueuepl 104 2 0 0 1 0 1 1 0 8 0 pipepl 112 154 0 141 2 1 1 1 0 8 0 fdescpl 488 240 0 225 3 0 3 3 0 8 0 filepl 152 1159 0 1101 3 0 3 3 0 8 0 lockfpl 104 5 0 4 1 0 1 1 0 8 0 lockfspl 48 3 0 2 1 0 1 1 0 8 0 sessionpl 112 19 0 9 1 0 1 1 0 8 0 pgrppl 48 19 0 9 1 0 1 1 0 8 0 ucredpl 96 52 0 43 1 0 1 1 0 8 0 zombiepl 144 225 0 225 2 1 1 1 0 8 1 processpl 896 255 0 225 4 0 4 4 0 8 0 procpl 632 290 0 251 4 0 4 4 0 8 0 sockpl 384 105 0 87 3 0 3 3 0 8 1 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 78 0 0 10 0 10 10 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 120 0 0 6 0 6 6 0 8 0 bufpl 256 5900 0 1315 287 0 287 287 0 8 0 anonpl 16 23100 0 21481 15 2 13 13 0 124 5 amapchunkpl 152 856 0 788 5 0 5 5 0 158 2 amappl16 192 209 0 172 2 0 2 2 0 8 0 amappl15 184 1 0 1 1 0 1 1 0 8 1 amappl14 176 28 0 24 2 1 1 1 0 8 0 amappl13 168 3 0 2 2 1 1 1 0 8 0 amappl12 160 8 0 7 1 0 1 1 0 8 0 amappl11 152 67 0 50 1 0 1 1 0 8 0 amappl10 144 16 0 14 1 0 1 1 0 8 0 amappl9 136 463 0 458 1 0 1 1 0 8 0 amappl8 128 127 0 117 1 0 1 1 0 8 0 amappl7 120 36 0 32 1 0 1 1 0 8 0 amappl6 112 99 0 84 1 0 1 1 0 8 0 amappl5 104 122 0 109 1 0 1 1 0 8 0 amappl4 96 514 0 485 1 0 1 1 0 8 0 amappl3 88 117 0 111 1 0 1 1 0 8 0 amappl2 80 1070 0 1003 4 1 3 3 0 8 1 amappl1 72 15372 0 14950 25 7 18 20 0 8 8 amappl 80 521 0 491 1 0 1 1 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 240 0 225 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 240 0 225 1 0 1 1 0 8 0 vmmpekpl 168 6510 0 6487 2 0 2 2 0 8 0 vmmpepl 168 33819 0 32831 88 8 80 80 0 357 37 vmsppl 368 239 0 225 2 0 2 2 0 8 0 pdppl 4096 487 0 450 6 0 6 6 0 8 1 pvpl 32 114458 0 110392 118 3 115 115 0 265 81 pmappl 232 239 0 225 1 0 1 1 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 428 0 4 13 0 13 13 0 8 0 ddb{1}>