login: panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806f2b8400+24 0xfdf3469d2f7d0bfd!=0x20cbb1d4bf89efd Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *511182 40940 0 0 0x4000000 1 syz-executor.0 235738 25103 0 0x14000 0x200 0 softnet 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(ffffffff8263bd58) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1789 [inline] pool_cache_get(ffffffff8263bd58) at pool_cache_get+0x323 sys/kern/subr_pool.c:1892 pool_get() at pool_get+0x91 sys/kern/subr_pool.c:572 m_copym(fffffd8072682200,0,3b9aca00,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copym(fffffd8072682200,0,3b9aca00,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667 ether_resolve(ffff8000001732a8,fffffd8072682200,fffffd806f6d6828,fffffd806f30b230,ffff8000221a30a8) at ether_resolve+0x49f sys/net/if_ethersubr.c:224 ether_output(ffff8000001732a8,fffffd8072682200,fffffd806f6d6828,fffffd806f30b230) at ether_output+0x47 ether_encap sys/net/if_ethersubr.c:307 [inline] ether_output(ffff8000001732a8,fffffd8072682200,fffffd806f6d6828,fffffd806f30b230) at ether_output+0x47 sys/net/if_ethersubr.c:336 ip_output(fffffd80674a4900,0,fffffd806f6d6818,20,0,fffffd806f6d67a8) at ip_output+0x125d sys/netinet/ip_output.c:511 rip_output(fffffd80674a4900,fffffd807ebaf488,ffff8000221a32b8,ffff800021152000) at rip_output+0x252 sys/netinet/raw_ip.c:289 rip_usrreq(fffffd807ebaf488,9,fffffd80674a4900,0,0,ffff800020ac09f0) at rip_usrreq+0x46a sys/netinet/raw_ip.c:538 sosend(fffffd807ebaf488,0,ffff8000221a3420,0,0,0) at sosend+0x645 sys/kern/uipc_socket.c:524 sendit(ffff800020ac09f0,6,ffff8000221a3580,0,ffff8000221a3670) at sendit+0x52b sys/kern/uipc_syscalls.c:662 sys_sendmsg(ffff800020ac09f0,ffff8000221a3628,ffff8000221a3670) at sys_sendmsg+0x1a4 sys/kern/uipc_syscalls.c:567 syscall(ffff8000221a36f0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff8000221a36f0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 end trace frame: 0xffff8000221a3770, count: 0 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 0xfffffd806f2b8400+24 0xfdf3469d2f7d0bfd!=0x20cbb1d4bf89efd 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(ffffffff8263bd58) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1789 [inline] pool_cache_get(ffffffff8263bd58) at pool_cache_get+0x323 sys/kern/subr_pool.c:1892 pool_get() at pool_get+0x91 sys/kern/subr_pool.c:572 m_copym(fffffd8072682200,0,3b9aca00,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copym(fffffd8072682200,0,3b9aca00,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667 ether_resolve(ffff8000001732a8,fffffd8072682200,fffffd806f6d6828,fffffd806f30b230,ffff8000221a30a8) at ether_resolve+0x49f sys/net/if_ethersubr.c:224 ether_output(ffff8000001732a8,fffffd8072682200,fffffd806f6d6828,fffffd806f30b230) at ether_output+0x47 ether_encap sys/net/if_ethersubr.c:307 [inline] ether_output(ffff8000001732a8,fffffd8072682200,fffffd806f6d6828,fffffd806f30b230) at ether_output+0x47 sys/net/if_ethersubr.c:336 ip_output(fffffd80674a4900,0,fffffd806f6d6818,20,0,fffffd806f6d67a8) at ip_output+0x125d sys/netinet/ip_output.c:511 rip_output(fffffd80674a4900,fffffd807ebaf488,ffff8000221a32b8,ffff800021152000) at rip_output+0x252 sys/netinet/raw_ip.c:289 rip_usrreq(fffffd807ebaf488,9,fffffd80674a4900,0,0,ffff800020ac09f0) at rip_usrreq+0x46a sys/netinet/raw_ip.c:538 sosend(fffffd807ebaf488,0,ffff8000221a3420,0,0,0) at sosend+0x645 sys/kern/uipc_socket.c:524 sendit(ffff800020ac09f0,6,ffff8000221a3580,0,ffff8000221a3670) at sendit+0x52b sys/kern/uipc_syscalls.c:662 sys_sendmsg(ffff800020ac09f0,ffff8000221a3628,ffff8000221a3670) at sys_sendmsg+0x1a4 sys/kern/uipc_syscalls.c:567 syscall(ffff8000221a36f0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff8000221a36f0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffffd2,0,3,837a1f5b280) at Xsyscall+0x128 end of kernel end trace frame: 0x83a53b75d00, count: -15 ddb{1}> show registers rdi 0xffffffff8215e1e7 db_enter+0x17 rsi 0x4493 __ALIGN_SIZE+0x3493 rbp 0xffff8000221a2d80 rbx 0xffff8000221a2e30 rdx 0x4494 __ALIGN_SIZE+0x3494 rcx 0xffff800021152000 rax 0xffff800021152000 r8 0xffffffff810b3fbf kprintf+0x16f r9 0x1 r10 0x25 r11 0x7f0f14203a15d7e r12 0x3000000008 r13 0xffff8000221a2d90 r14 0x100 r15 0x1 rip 0xffffffff8215e1e8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000221a2d70 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=511182 stat=onproc flags process=0 proc=4000000 pri=78, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab13d8,0xffffffff8265a6f8 process=0xffff800020adc000 user=0xffff80002219e000, vmspace=0xfffffd807f00b5c0 estcpu=28, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 40940 246289 39925 0 2 0 syz-executor.0 40940 38780 39925 0 3 0x4000080 kqread syz-executor.0 40940 300857 39925 0 3 0x4000080 select syz-executor.0 40940 44043 39925 0 3 0x4000080 fsleep syz-executor.0 *40940 511182 39925 0 7 0x4000000 syz-executor.0 39925 219108 2116 0 3 0x82 nanosleep syz-executor.0 71362 239934 1 0 3 0x100083 ttyin getty 91624 218505 2116 0 3 0x82 piperd syz-executor.1 53447 513449 0 0 3 0x14200 acct acct 64043 77361 0 0 3 0x14200 bored sosplice 2116 381914 74544 0 3 0x82 thrsleep syz-fuzzer 2116 279691 74544 0 3 0x4000082 thrsleep syz-fuzzer 2116 492147 74544 0 3 0x4000082 thrsleep syz-fuzzer 2116 264353 74544 0 3 0x4000082 thrsleep syz-fuzzer 2116 454115 74544 0 3 0x4000082 thrsleep syz-fuzzer 2116 316876 74544 0 3 0x4000082 thrsleep syz-fuzzer 2116 140053 74544 0 3 0x4000082 thrsleep syz-fuzzer 2116 213731 74544 0 3 0x4000082 thrsleep syz-fuzzer 2116 350773 74544 0 3 0x4000082 kqread syz-fuzzer 2116 323301 74544 0 3 0x4000082 thrsleep syz-fuzzer 74544 51095 19730 0 3 0x10008a pause ksh 19730 267327 28264 0 3 0x92 select sshd 28264 371160 1 0 3 0x80 select sshd 98812 424827 55580 74 3 0x100092 bpf pflogd 55580 272397 1 0 3 0x80 netio pflogd 69042 493888 34547 73 3 0x100090 kqread syslogd 34547 146301 1 0 3 0x100082 netio syslogd 77273 95796 1 77 3 0x100090 poll dhclient 62173 348841 1 0 3 0x80 poll dhclient 81474 238373 0 0 3 0x14200 pgzero zerothread 39504 473075 0 0 3 0x14200 aiodoned aiodoned 66101 345052 0 0 3 0x14200 syncer update 8052 163538 0 0 3 0x14200 cleaner cleaner 67631 44027 0 0 3 0x14200 reaper reaper 19551 113205 0 0 3 0x14200 pgdaemon pagedaemon 5048 367291 0 0 3 0x14200 bored crynlk 55710 355625 0 0 3 0x14200 bored crypto 91348 313137 0 0 3 0x40014200 acpi0 acpi0 87113 392758 0 0 3 0x40014200 idle1 25103 235738 0 0 7 0x14200 softnet 7814 75269 0 0 3 0x14200 bored systqmp 80369 182155 0 0 3 0x14200 bored systq 20567 365312 0 0 3 0x40014200 bored softclock 80730 422546 0 0 3 0x40014200 idle0 4583 87431 0 0 3 0x14200 bored smr 1 406357 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex /syzkaller/managers/multicore/kernel/sys/kern/kern_timeout.c:94 r = 0 (0xffffffff824b8230) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 timeout_del+0x2d sys/kern/kern_timeout.c:364 #4 vio_txeof+0x1dd sys/dev/pv/if_vio.c:1158 #5 vio_start+0x3e sys/dev/pv/if_vio.c:724 #6 if_qstart_compat+0x36 sys/net/if.c:687 #7 ifq_serialize+0x173 sys/net/ifq.c:108 #8 taskq_thread+0x9c sys/kern/kern_task.c:368 #9 proc_trampoline+0x1c Process 40940 (syz-executor.0) thread 0xffff800020ac09f0 (511182) exclusive rwlock netlock r = 0 (0xffffffff824b35b8) #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_sendmsg+0x1a4 sys/kern/uipc_syscalls.c:567 #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 Process 25103 (softnet) thread 0xffff800020a10000 (235738) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82628d10) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 if_qstart_compat+0x1a sys/net/if.c:685 #2 ifq_serialize+0x173 sys/net/ifq.c:108 #3 taskq_thread+0x9c sys/kern/kern_task.c:368 #4 proc_trampoline+0x1c shared rwlock softnet r = 0 (0xffff8000000230e0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 taskq_thread+0x8f sys/kern/kern_task.c:367 #2 proc_trampoline+0x1c ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9600 6468K 7460K 78643K 28833 0 0 pcb 13 11K 12K 78643K 945 0 0 rtable 125 14K 14K 78643K 5368 0 0 ifaddr 90 24K 28K 78643K 1297 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1912 0 0 iov 0 0K 24K 78643K 874 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1214 76K 77K 78643K 9836 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 9K 78643K 161 0 0 VM map 2 1K 1K 78643K 16 0 0 sem 12 0K 1K 78643K 1275 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 12789 0 0 sigio 0 0K 0K 78643K 151 0 0 proc 61 63K 95K 78643K 2573 0 0 subproc 32 2K 2K 78643K 663 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 653 0 0 in_multi 35 2K 2K 78643K 2006 0 0 ether_multi 1 0K 0K 78643K 43 0 0 mrt 9 0K 0K 78643K 68 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 132 583K 583K 78643K 132 0 0 exec 0 0K 1K 78643K 1204 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 162 25K 34K 78643K 37143 0 0 UVM aobj 130 9K 9K 78643K 133 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 907 0 0 NDP 21 0K 1K 78643K 593 0 0 temp 237 3557K 3659K 78643K 132394 0 0 kqueue 0 0K 0K 78643K 295 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 64 130 0 125 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 647 0 645 1 0 1 1 0 8 0 rtentry 112 1465 0 1421 2 0 2 2 0 8 0 unpcb 120 3820 0 3802 8 7 1 2 0 8 0 syncache 264 32 0 32 9 9 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 178 0 178 14 14 0 1 0 8 0 tcpcb 544 2728 0 2724 7 6 1 3 0 8 0 inpcb 280 17755 0 17746 51 48 3 13 0 8 2 rttmr 72 10 0 9 6 5 1 1 0 8 0 nd6 48 316 0 312 2 1 1 1 0 8 0 pkpcb 40 22 0 22 7 7 0 1 0 8 0 swfcl 56 8 0 0 1 0 1 1 0 8 0 ppxss 1128 178 0 177 4 3 1 1 0 8 0 pffrag 232 2829 0 2828 24 23 1 20 0 482 0 pffrnode 88 2398 0 2397 5 4 1 1 0 8 0 pffrent 40 5235 0 5234 8 7 1 4 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 24 395 0 345 1 0 1 1 0 8 0 pfstkey 112 396 0 346 2 0 2 2 0 8 0 pfstate 328 396 0 346 9 4 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 8663 0 8396 44 27 17 20 0 8 0 art_table 32 8664 0 8396 4 1 3 3 0 8 0 art_node 16 1454 0 1414 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 8 1 0 1 1 0 8 0 semapl 112 1263 0 1253 1 0 1 1 0 8 0 shmpl 112 131 0 3 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 21606 0 20177 47 0 47 47 0 8 0 ffsino 272 21606 0 20177 97 1 96 96 0 8 0 nchpl 144 39112 0 38628 60 39 21 60 0 8 0 uvmvnodes 72 6919 0 0 126 0 126 126 0 8 0 vnodes 208 6919 0 0 365 0 365 365 0 8 0 namei 1024 120072 0 120072 3 2 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vmpool 552 14 0 14 6 6 0 1 0 8 0 scsiplug 64 116 0 116 8 8 0 1 0 8 0 scxspl 192 111838 0 111838 35 34 1 7 0 8 1 plimitpl 152 614 0 606 1 0 1 1 0 8 0 sigapl 432 12887 0 12872 4 2 2 3 0 8 0 futexpl 56 177462 0 177461 1 0 1 1 0 8 0 knotepl 112 2600 0 2581 8 7 1 3 0 8 0 kqueuepl 104 2704 0 2700 4 3 1 2 0 8 0 pipepl 112 4072 0 4053 13 11 2 2 0 8 0 fdescpl 488 12888 0 12872 3 0 3 3 0 8 0 filepl 152 77215 0 77111 51 45 6 14 0 8 1 lockfpl 104 6708 0 6707 1 0 1 1 0 8 0 lockfspl 48 2409 0 2408 1 0 1 1 0 8 0 sessionpl 112 63 0 52 1 0 1 1 0 8 0 pgrppl 48 1573 0 1562 1 0 1 1 0 8 0 ucredpl 96 12718 0 12709 1 0 1 1 0 8 0 zombiepl 144 12884 0 12884 2 1 1 1 0 8 1 processpl 896 12917 0 12884 5 1 4 5 0 8 0 procpl 632 34469 0 34423 19 14 5 5 0 8 1 srpgc 64 58 0 58 25 24 1 1 0 8 1 sosppl 128 115 0 115 23 22 1 1 0 8 1 sockpl 384 22488 0 22459 73 67 6 22 0 8 2 mcl64k 65536 265 0 0 33 28 5 33 0 8 0 mcl16k 16384 25 0 0 4 1 3 3 0 8 0 mcl12k 12288 49 0 0 2 0 2 2 0 8 0 mcl9k 9216 25 0 0 2 0 2 2 0 8 0 mcl8k 8192 25 0 0 4 1 3 3 0 8 0 mcl4k 4096 49 0 0 5 2 3 4 0 8 0 mcl2k2 2112 18 0 0 2 0 2 2 0 8 0 mcl2k 2048 794 0 0 77 1 76 76 0 8 0 mtagpl 80 114 0 0 2 0 2 2 0 8 0 mbufpl 256 1349 0 0 60 0 60 60 0 8 0 mbufpl: pool(0xffffffff8263bd58:mbufpl): free list modified: page 0xfffffd8064853000; item ordinal 1; addr 0xfffffd8064853f00 (p 0xfffffd807ea94000); offset 0x0=0x0 mbufpl: pool(0xffffffff8263bd58:mbufpl): free list modified: page 0xfffffd8064852000; item ordinal 0; addr 0xfffffd8064852200 (p 0xfffffd807ea94000); offset 0x0=0x0 mbufpl: pool(0xffffffff8263bd58:mbufpl): free list modified: page 0xfffffd8064852000; item ordinal 3; addr 0xfffffd8064852600 (p 0xfffffd807ea94000); offset 0x0=0x0 mbufpl: pool(0xffffffff8263bd58:mbufpl): free list modified: page 0xfffffd8064855000; item ordinal 0; addr 0xfffffd8064855700 (p 0xfffffd807ea94000); offset 0x0=0x0 mbufpl: pool(0xffffffff8263bd58:mbufpl): free list modified: page 0xfffffd8066486000; item ordinal 1; addr 0xfffffd8066486c00 (p 0xfffffd8067e38000); offset 0x0=0x0 mbufpl: pool(0xffffffff8263bd58:mbufpl): free list modified: page 0xfffffd807108a000; item ordinal 0; addr 0xfffffd807108a500 (p 0xfffffd8067e38000); offset 0x0=0x0 mbufpl: pool(0xffffffff8263bd58:mbufpl): free list modified: page 0xfffffd8071f1c000; item ordinal 1; addr 0xfffffd8071f1c900 (p 0xfffffd80674a6000); offset 0x0=0x0 bufpl 256 30224 0 23176 441 0 441 441 0 8 0 anonpl 16 1005485 0 998696 225 193 32 49 0 124 2 amapchunkpl 152 67187 0 67091 73 67 6 12 0 158 0 amappl16 192 58806 0 58484 175 157 18 32 0 8 0 amappl15 184 2002 0 2001 5 4 1 1 0 8 0 amappl14 176 1954 0 1951 2 1 1 1 0 8 0 amappl13 168 3304 0 3304 5 5 0 1 0 8 0 amappl12 160 1289 0 1279 1 0 1 1 0 8 0 amappl11 152 2422 0 2407 1 0 1 1 0 8 0 amappl10 144 561 0 555 1 0 1 1 0 8 0 amappl9 136 2656 0 2650 1 0 1 1 0 8 0 amappl8 128 2323 0 2244 3 0 3 3 0 8 0 amappl7 120 759 0 749 1 0 1 1 0 8 0 amappl6 112 2354 0 2339 1 0 1 1 0 8 0 amappl5 104 1958 0 1942 1 0 1 1 0 8 0 amappl4 96 12796 0 12755 2 0 2 2 0 8 0 amappl3 88 2345 0 2339 1 0 1 1 0 8 0 amappl2 80 105020 0 104942 4 2 2 3 0 8 0 amappl1 72 265801 0 265348 26 16 10 20 0 8 0 amappl 80 35329 0 35290 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 64 132 0 3 3 0 3 3 0 8 0 uaddrrnd 24 12902 0 12872 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 12902 0 12872 1 0 1 1 0 8 0 vmmpekpl 168 82774 0 82741 2 0 2 2 0 8 0 vmmpepl 168 1516623 0 1515076 239 160 79 89 0 357 3 vmsppl 368 12887 0 12872 2 0 2 2 0 8 0 pdppl 4096 25811 0 25772 6 0 6 6 0 8 0 pvpl 32 3134182 0 3123993 527 415 112 127 0 265 26 pmappl 232 12901 0 12886 11 10 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 791 0 72 22 0 22 22 0 8 0