g Ãg Ã""*"*panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd8065d92800+24 0xa7d0fb246866b4f8!=0x582f06a40fa543f8 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *347329 7462 60929 0x10 0x4000000 1 syz-executor.1 130330 63986 0 0x2 0x480 0 syz-executor.1 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(ffffffff8264a820) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1789 [inline] pool_cache_get(ffffffff8264a820) at pool_cache_get+0x323 sys/kern/subr_pool.c:1892 pool_get() at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(1,1) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 m_getuio(ffff800023b8cfc8,1,1000,ffff800023b8d148) at m_getuio+0xe4 sys/kern/uipc_socket.c:556 sosend(fffffd807b3e24a8,0,ffff800023b8d148,0,0,0) at sosend+0x510 sys/kern/uipc_socket.c:511 dofilewritev(ffff800020abe290,4,ffff800023b8d148,0,ffff800023b8d230) at dofilewritev+0x1b7 sys/kern/sys_generic.c:364 sys_write(ffff800020abe290,ffff800023b8d1e8,ffff800023b8d230) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff800023b8d2b0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023b8d2b0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,c,0,3,43372864010) at Xsyscall+0x128 end of kernel end trace frame: 0x435a3ac4bf0, count: 4 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 0xfffffd8065d92800+24 0xa7d0fb246866b4f8!=0x582f06a40fa543f8 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(ffffffff8264a820) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1789 [inline] pool_cache_get(ffffffff8264a820) at pool_cache_get+0x323 sys/kern/subr_pool.c:1892 pool_get() at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(1,1) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 m_getuio(ffff800023b8cfc8,1,1000,ffff800023b8d148) at m_getuio+0xe4 sys/kern/uipc_socket.c:556 sosend(fffffd807b3e24a8,0,ffff800023b8d148,0,0,0) at sosend+0x510 sys/kern/uipc_socket.c:511 dofilewritev(ffff800020abe290,4,ffff800023b8d148,0,ffff800023b8d230) at dofilewritev+0x1b7 sys/kern/sys_generic.c:364 sys_write(ffff800020abe290,ffff800023b8d1e8,ffff800023b8d230) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff800023b8d2b0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023b8d2b0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,c,0,3,43372864010) at Xsyscall+0x128 end of kernel end trace frame: 0x435a3ac4bf0, count: -11 ddb{1}> show registers rdi 0xffffffff81bddb67 db_enter+0x17 rsi 0x3239 __ALIGN_SIZE+0x2239 rbp 0xffff800023b8cd00 rbx 0xffff800023b8cdb0 rdx 0x323a __ALIGN_SIZE+0x223a rcx 0xffff800022d82000 rax 0xffff800022d82000 r8 0xffffffff81b7f02f kprintf+0x16f r9 0x1 r10 0x25 r11 0xf4fcdceeb86d51d5 r12 0x3000000008 r13 0xffff800023b8cd10 r14 0x100 r15 0x1 rip 0xffffffff81bddb68 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023b8ccf0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=347329 stat=onproc flags process=10 proc=4000000 pri=82, usrpri=82, nice=20 forw=0xffffffffffffffff, list=0xffff800020abec70,0xffffffff82658ad8 process=0xffff800020a8ae10 user=0xffff800023b88000, vmspace=0xfffffd807f00b5c0 estcpu=32, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 7462 321206 63986 60929 2 0x10 syz-executor.1 * 7462 347329 63986 60929 7 0x4000010 syz-executor.1 96525 67513 47026 0 2 0x2 syz-executor.0 89727 108531 0 0 3 0x14200 bored sosplice 63986 130330 47026 0 7 0x482 syz-executor.1 43945 414484 0 0 3 0x14200 acct acct 47026 287457 54441 0 3 0x82 thrsleep syz-fuzzer 47026 173701 54441 0 2 0x4000482 syz-fuzzer 47026 371380 54441 0 3 0x4000082 thrsleep syz-fuzzer 47026 244226 54441 0 3 0x4000082 thrsleep syz-fuzzer 47026 9659 54441 0 3 0x4000082 thrsleep syz-fuzzer 47026 294916 54441 0 3 0x4000082 thrsleep syz-fuzzer 47026 434415 54441 0 3 0x4000082 thrsleep syz-fuzzer 47026 266165 54441 0 3 0x4000082 kqread syz-fuzzer 47026 250934 54441 0 3 0x4000082 thrsleep syz-fuzzer 47026 448953 54441 0 2 0x4000482 syz-fuzzer 54441 467305 17275 0 3 0x10008a pause ksh 17275 307251 13762 0 3 0x92 select sshd 5671 50679 1 0 3 0x100083 ttyin getty 13762 301786 1 0 3 0x80 select sshd 16354 459482 8272 74 3 0x100092 bpf pflogd 8272 216291 1 0 3 0x80 netio pflogd 1134 359323 61052 73 3 0x100090 kqread syslogd 61052 34362 1 0 3 0x100082 netio syslogd 12064 312736 1 77 3 0x100090 poll dhclient 20685 466716 1 0 3 0x80 poll dhclient 18530 224678 0 0 3 0x14200 pgzero zerothread 65943 280857 0 0 3 0x14200 aiodoned aiodoned 36551 236440 0 0 3 0x14200 syncer update 27953 235210 0 0 3 0x14200 cleaner cleaner 47451 149215 0 0 3 0x14200 reaper reaper 66332 238842 0 0 3 0x14200 pgdaemon pagedaemon 95620 273184 0 0 3 0x14200 bored crynlk 29939 85852 0 0 3 0x14200 bored crypto 14491 394854 0 0 3 0x40014200 acpi0 acpi0 3545 414803 0 0 3 0x40014200 idle1 94615 21477 0 0 3 0x14200 bored softnet 16304 250015 0 0 3 0x14200 bored systqmp 38068 16427 0 0 3 0x14200 bored systq 71928 366519 0 0 3 0x40014200 bored softclock 2580 140233 0 0 3 0x40014200 idle0 46973 461620 0 0 3 0x14200 bored smr 1 17532 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 96525 (syz-executor.0) thread 0xffff800020abe508 (67513) exclusive rrwlock inode r = 0 (0xfffffd806ac73c48) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x447 sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0xf0 sys/kern/vfs_vops.c:615 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:574 #5 vget+0x1c3 sys/kern/vfs_subr.c:672 #6 ufs_ihashget+0x141 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x74 sys/ufs/ffs/ffs_vfsops.c:1323 #8 ufs_lookup+0x14b4 sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:91 #10 vfs_lookup+0x7a6 sys/kern/vfs_lookup.c:568 #11 namei+0x63c sys/kern/vfs_lookup.c:249 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1785 #13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80634995f0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x447 sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0xf0 sys/kern/vfs_vops.c:615 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:574 #5 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:419 #6 namei+0x63c sys/kern/vfs_lookup.c:249 #7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1785 #8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9563 6447K 7758K 78643K 13616 0 0 pcb 13 10K 12K 78643K 214 0 0 rtable 85 8K 9K 78643K 889 0 0 ifaddr 75 16K 17K 78643K 277 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1511 0 0 iov 0 0K 24K 78643K 189 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 77K 78643K 2200 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 18 0 0 VM map 19 9K 9K 78643K 19 0 0 sem 12 0K 0K 78643K 622 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 1048 0 0 sigio 0 0K 0K 78643K 12 0 0 proc 62 63K 95K 78643K 753 0 0 subproc 32 2K 2K 78643K 119 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 76 0 0 in_multi 19 1K 2K 78643K 124 0 0 ether_multi 1 0K 0K 78643K 12 0 0 mrt 0 0K 0K 78643K 9 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 60 265K 265K 78643K 60 0 0 exec 0 0K 1K 78643K 387 0 0 pfkey data 0 0K 0K 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 129 184K 186K 78643K 4804 0 0 UVM aobj 130 4K 5K 78643K 132 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 188 0 0 NDP 18 0K 0K 78643K 83 0 0 temp 215 3564K 4196K 78643K 12821 0 0 kqueue 0 0K 0K 78643K 7 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 30 0 27 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 66 0 63 1 0 1 1 0 8 0 rtentry 112 140 0 112 2 0 2 2 0 8 0 unpcb 120 2378 0 2366 3 2 1 2 0 8 0 syncache 264 6 0 6 2 2 0 1 0 8 0 tcpqe 32 4 0 4 1 1 0 1 0 8 0 tcpcb 544 380 0 376 1 0 1 1 0 8 0 inpcb 280 1327 0 1320 15 13 2 13 0 8 1 rttmr 72 2 0 2 2 1 1 1 0 8 1 ip6q 72 4 0 4 2 2 0 1 0 8 0 ip6af 40 12 0 12 2 2 0 1 0 8 0 nd6 48 17 0 15 1 0 1 1 0 8 0 pkpcb 40 10 0 10 5 5 0 1 0 8 0 ppxss 1128 27 0 27 4 3 1 1 0 8 1 pffrag 232 29 0 29 3 3 0 1 0 482 0 pffrnode 88 29 0 29 3 3 0 1 0 8 0 pffrent 40 592 0 592 3 3 0 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 24 106 0 59 1 0 1 1 0 8 0 pfstkey 112 106 0 59 2 0 2 2 0 8 0 pfstate 328 106 0 59 5 0 5 5 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 4 0 3 3 2 1 3 0 8 0 art_heap4 256 568 0 400 20 8 12 15 0 8 0 art_table 32 572 0 403 2 0 2 2 0 8 0 art_node 16 139 0 113 1 0 1 1 0 8 0 sysvmsgpl 40 27 0 19 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 620 0 610 1 0 1 1 0 8 0 shmpl 112 130 0 2 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 3030 0 1621 46 0 46 46 0 8 0 ffsino 272 3030 0 1621 95 0 95 95 0 8 0 nchpl 144 4784 0 3182 61 0 61 61 0 8 0 uvmvnodes 72 3816 0 0 70 0 70 70 0 8 0 vnodes 208 3816 0 0 201 0 201 201 0 8 0 namei 1024 15305 0 15305 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 17 0 0 3 0 3 3 0 8 0 vmpool 552 17 0 0 2 0 2 2 0 8 0 scsiplug 64 1 0 1 1 1 0 1 0 8 0 scxspl 192 16001 0 16001 15 13 2 7 0 8 2 plimitpl 152 102 0 94 1 0 1 1 0 8 0 sigapl 432 1233 0 1218 3 1 2 3 0 8 0 futexpl 56 23237 0 23237 1 0 1 1 0 8 1 knotepl 112 230 0 211 1 0 1 1 0 8 0 kqueuepl 104 218 0 216 1 0 1 1 0 8 0 pipepl 112 708 0 689 4 3 1 2 0 8 0 fdescpl 488 1234 0 1218 3 0 3 3 0 8 0 filepl 152 10675 0 10572 15 9 6 13 0 8 2 lockfpl 104 668 0 667 1 0 1 1 0 8 0 lockfspl 48 184 0 183 1 0 1 1 0 8 0 sessionpl 112 23 0 12 1 0 1 1 0 8 0 pgrppl 48 41 0 30 1 0 1 1 0 8 0 ucredpl 96 1067 0 1057 1 0 1 1 0 8 0 zombiepl 144 1218 0 1218 1 0 1 1 0 8 1 processpl 896 1251 0 1218 4 0 4 4 0 8 0 procpl 632 3771 0 3728 6 1 5 5 0 8 1 srpgc 64 10 0 10 3 3 0 1 0 8 0 sosppl 128 3 0 3 1 1 0 1 0 8 0 sockpl 384 3794 0 3772 25 21 4 22 0 8 1 mcl64k 65536 9 0 0 2 0 2 2 0 8 0 mcl16k 16384 14 0 0 2 0 2 2 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 5 0 0 1 0 1 1 0 8 0 mcl8k 8192 10 0 0 2 0 2 2 0 8 0 mcl4k 4096 16 0 0 2 0 2 2 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 176 0 0 21 0 21 21 0 8 0 mtagpl 80 72 0 0 2 0 2 2 0 8 0 mbufpl 256 512 0 0 28 0 28 28 0 8 0 bufpl 256 11018 0 3970 441 0 441 441 0 8 0 anonpl 16 155005 0 136815 123 33 90 90 0 124 13 amapchunkpl 152 8762 0 8644 23 16 7 13 0 158 0 amappl16 192 6625 0 5575 97 36 61 65 0 8 8 amappl14 176 152 0 150 1 0 1 1 0 8 0 amappl13 168 125 0 124 2 1 1 1 0 8 0 amappl12 160 311 0 308 2 1 1 1 0 8 0 amappl11 152 68 0 53 1 0 1 1 0 8 0 amappl10 144 26 0 20 1 0 1 1 0 8 0 amappl9 136 1085 0 1076 1 0 1 1 0 8 0 amappl8 128 627 0 595 2 0 2 2 0 8 0 amappl7 120 64 0 56 1 0 1 1 0 8 0 amappl6 112 95 0 82 1 0 1 1 0 8 0 amappl5 104 496 0 481 1 0 1 1 0 8 0 amappl4 96 1632 0 1601 1 0 1 1 0 8 0 amappl3 88 217 0 212 1 0 1 1 0 8 0 amappl2 80 8686 0 8611 3 1 2 3 0 8 0 amappl1 72 37668 0 37227 25 14 11 20 0 8 0 amappl 80 4115 0 4064 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 64 131 0 2 3 0 3 3 0 8 0 uaddrrnd 24 1251 0 1218 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1251 0 1218 1 0 1 1 0 8 0 vmmpekpl 168 14085 0 14044 3 0 3 3 0 8 0 vmmpepl 168 162287 0 160058 186 63 123 137 0 357 19 vmsppl 368 1233 0 1218 2 0 2 2 0 8 0 pdppl 4096 2509 0 2453 8 0 8 8 0 8 0 pvpl 32 425878 0 404756 264 55 209 211 0 265 30 pmappl 232 1250 0 1218 2 0 2 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 635 0 13 18 0 18 18 0 8 0