panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806f30b200+24 0xbfdbcfcbd25362b5!=0x4024324bbd6bdcb5 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *480089 74788 0 0 0 1K syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823fdf6d) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff8291f248) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff8291f248) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff8291f248,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(2,3) at m_get+0x4c sys/kern/uipc_mbuf.c:250 rt_ifa_del(ffff800000aa1c00,800100,ffff800000aa1c40,0) at rt_ifa_del+0xa1 sys/net/route.c:1163 in6_unlink_ifa(ffff800000aa1c00,ffff800000ac5000) at in6_unlink_ifa+0x571 sys/netinet6/in6.c:943 in6_update_ifa(ffff800000ac5000,ffff800020ec75c0,0) at in6_update_ifa+0x13e7 sys/netinet6/in6.c:875 in6_ioctl_change_ifaddr(8080691a,ffff800020ec75c0,ffff800000ac5000) at in6_ioctl_change_ifaddr+0x40c sys/netinet6/in6.c:352 ifioctl(fffffd806eaede18,8080691a,ffff800020ec75c0,ffff800020ddd388) at ifioctl+0xe70 sys/net/if.c:2282 soo_ioctl(fffffd806cf77c88,8080691a,ffff800020ec75c0,ffff800020ddd388) at soo_ioctl+0x27c sys/kern/sys_socket.c:138 sys_ioctl(ffff800020ddd388,ffff800020ec76d8,ffff800020ec7720) at sys_ioctl+0x4a5 syscall(ffff800020ec77a0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020ec77a0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff8710, count: 1 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 0xfffffd806f30b200+24 0xbfdbcfcbd25362b5!=0x4024324bbd6bdcb5 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823fdf6d) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff8291f248) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff8291f248) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff8291f248,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(2,3) at m_get+0x4c sys/kern/uipc_mbuf.c:250 rt_ifa_del(ffff800000aa1c00,800100,ffff800000aa1c40,0) at rt_ifa_del+0xa1 sys/net/route.c:1163 in6_unlink_ifa(ffff800000aa1c00,ffff800000ac5000) at in6_unlink_ifa+0x571 sys/netinet6/in6.c:943 in6_update_ifa(ffff800000ac5000,ffff800020ec75c0,0) at in6_update_ifa+0x13e7 sys/netinet6/in6.c:875 in6_ioctl_change_ifaddr(8080691a,ffff800020ec75c0,ffff800000ac5000) at in6_ioctl_change_ifaddr+0x40c sys/netinet6/in6.c:352 ifioctl(fffffd806eaede18,8080691a,ffff800020ec75c0,ffff800020ddd388) at ifioctl+0xe70 sys/net/if.c:2282 soo_ioctl(fffffd806cf77c88,8080691a,ffff800020ec75c0,ffff800020ddd388) at soo_ioctl+0x27c sys/kern/sys_socket.c:138 sys_ioctl(ffff800020ddd388,ffff800020ec76d8,ffff800020ec7720) at sys_ioctl+0x4a5 syscall(ffff800020ec77a0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020ec77a0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff8710, count: -14 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020ec6e30 rbx 0xffff800020ec6ee0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff817e707f kprintf+0x16f r9 0x1 r10 0x2 r11 0x28f37341230487ec r12 0x3000000008 r13 0xffff800020ec6e40 r14 0x100 r15 0x1 rip 0xffffffff81354558 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020ec6e20 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=480089 stat=onproc flags process=0 proc=0 pri=52, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ddc278,0xffffffff8291a7b0 process=0xffff800020df1720 user=0xffff800020ec2000, vmspace=0xfffffd807f0002e0 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *74788 480089 47246 0 7 0 syz-executor.0 47246 43234 7869 0 3 0x82 nanosleep syz-executor.0 7869 384611 10425 0 3 0x82 nanosleep syz-execprog 7869 96342 10425 0 3 0x4000082 nanosleep syz-execprog 7869 75910 10425 0 3 0x4000082 thrsleep syz-execprog 7869 62391 10425 0 3 0x4000082 thrsleep syz-execprog 7869 364253 10425 0 3 0x4000082 kqread syz-execprog 7869 284716 10425 0 3 0x4000082 thrsleep syz-execprog 7869 463001 10425 0 3 0x4000082 thrsleep syz-execprog 7869 303990 10425 0 3 0x4000082 thrsleep syz-execprog 7869 176697 10425 0 3 0x4000082 thrsleep syz-execprog 10425 308304 78639 0 3 0x10008a pause ksh 78639 102594 71335 0 3 0x92 select sshd 39218 314372 1 0 3 0x100083 ttyin getty 71335 34905 1 0 3 0x80 select sshd 41248 274662 42638 74 3 0x100092 bpf pflogd 42638 315939 1 0 3 0x80 netio pflogd 32013 270827 72192 73 3 0x100090 kqread syslogd 72192 24660 1 0 3 0x100082 netio syslogd 70712 342552 1 77 3 0x100090 poll dhclient 22091 64149 1 0 3 0x80 poll dhclient 74460 247481 0 0 3 0x14200 bored smr 33665 337040 0 0 3 0x14200 pgzero zerothread 74728 80093 0 0 3 0x14200 aiodoned aiodoned 78705 499280 0 0 3 0x14200 syncer update 86085 317663 0 0 3 0x14200 cleaner cleaner 1101 201939 0 0 3 0x14200 reaper reaper 68205 164058 0 0 3 0x14200 pgdaemon pagedaemon 22870 479774 0 0 3 0x14200 bored crynlk 45321 77689 0 0 3 0x14200 bored crypto 42327 97368 0 0 3 0x40014200 acpi0 acpi0 79511 23603 0 0 3 0x40014200 idle1 71133 270414 0 0 3 0x14200 bored softnet 66234 385203 0 0 3 0x14200 bored systqmp 51818 523721 0 0 3 0x14200 bored systq 62784 267111 0 0 3 0x40014200 bored softclock 67783 208923 0 0 7 0x40014200 idle0 1 500688 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 74788 (syz-executor.0) thread 0xffff800020ddd388 (480089) exclusive rwlock netlock r = 0 (0xffffffff826fbc18) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 in6_ioctl_change_ifaddr+0x155 sys/netinet6/in6.c:295 #2 ifioctl+0xe70 sys/net/if.c:2282 #3 soo_ioctl+0x27c sys/kern/sys_socket.c:138 #4 sys_ioctl+0x4a5 #5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828cb930) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 soo_ioctl+0x26a sys/kern/sys_socket.c:138 #2 sys_ioctl+0x4a5 #3 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #4 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9467 6396K 6396K 78643K 10560 0 pcb 13 8K 8K 78643K 13 0 rtable 83 2K 2K 78643K 163 0 ifaddr 38 9K 9K 78643K 301 0 counters 41 33K 33K 78643K 41 0 ioctlops 0 0K 4K 78643K 1468 0 iov 0 0K 0K 78643K 263 0 mount 1 1K 1K 78643K 1 0 vnodes 1183 74K 75K 78643K 1188 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 3 8K 12K 78643K 280 0 proc 59 63K 83K 78643K 398 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 22 1K 1K 78643K 22 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 19 95K 95K 78643K 19 0 exec 0 0K 1K 78643K 197 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 78 12K 12K 78643K 1216 0 UVM aobj 2 2K 2K 78643K 2 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 5 0K 0K 78643K 7 0 temp 29 3849K 3913K 78643K 2393 0 kqueue 3 4K 4K 78643K 3 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 4 0 0 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 1 1 0 1 1 0 8 0 unpcb 120 29 0 19 1 0 1 1 0 8 0 syncache 264 5 0 5 2 2 0 1 0 8 0 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 296 296 0 289 1 0 1 1 0 8 0 nd6 48 3 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 256 144 0 0 9 0 9 9 0 8 0 art_table 32 145 0 0 2 0 2 2 0 8 0 art_node 16 33 0 3 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1686 0 284 88 0 88 88 0 8 0 ffsino 272 1686 0 284 94 0 94 94 0 8 0 nchpl 144 2167 0 563 60 0 60 60 0 8 0 uvmvnodes 72 1696 0 0 31 0 31 31 0 8 0 vnodes 208 1696 0 0 90 0 90 90 0 8 0 namei 1024 5278 0 5278 2 1 1 1 0 8 1 percpumem 16 31 0 0 1 0 1 1 0 8 0 scxspl 192 6181 0 6180 9 7 2 7 0 8 1 plimitpl 152 15 0 8 1 0 1 1 0 8 0 sigapl 424 503 0 473 4 0 4 4 0 8 0 knotepl 112 47 0 36 1 0 1 1 0 8 0 kqueuepl 144 2 0 0 1 0 1 1 0 8 0 pipelkpl 48 77 0 70 2 1 1 1 0 8 0 pipepl 120 154 0 141 2 1 1 1 0 8 0 fdescpl 496 488 0 473 3 0 3 3 0 8 0 filepl 152 1640 0 1581 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 62 0 53 1 0 1 1 0 8 0 zombiepl 144 473 0 473 2 1 1 1 0 8 1 processpl 984 503 0 473 5 0 5 5 0 8 1 procpl 624 511 0 473 4 0 4 4 0 8 1 sockpl 400 342 0 323 2 0 2 2 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 73 0 0 10 0 10 10 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 115 0 0 6 0 6 6 0 8 0 bufpl 280 3311 0 133 227 0 227 227 0 8 0 anonpl 16 29122 0 27253 14 2 12 12 0 124 4 amapchunkpl 152 1075 0 1008 5 0 5 5 0 158 2 amappl16 192 1206 0 1154 3 0 3 3 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 294 0 288 1 0 1 1 0 8 0 amappl13 168 23 0 21 2 1 1 1 0 8 0 amappl12 160 9 0 7 2 1 1 1 0 8 0 amappl11 152 54 0 38 1 0 1 1 0 8 0 amappl10 144 16 0 13 1 0 1 1 0 8 0 amappl9 136 241 0 239 1 0 1 1 0 8 0 amappl8 128 270 0 262 1 0 1 1 0 8 0 amappl7 120 116 0 105 1 0 1 1 0 8 0 amappl6 112 25 0 22 2 1 1 1 0 8 0 amappl5 104 400 0 384 1 0 1 1 0 8 0 amappl4 96 499 0 471 1 0 1 1 0 8 0 amappl3 88 368 0 362 1 0 1 1 0 8 0 amappl2 80 1434 0 1374 3 1 2 2 0 8 0 amappl1 72 17305 0 16880 23 5 18 18 0 8 8 amappl 80 740 0 711 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 18 0 17 1 0 1 1 0 8 0 aobjpl 64 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 488 0 473 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 488 0 473 1 0 1 1 0 8 0 vmmpekpl 168 6898 0 6873 2 0 2 2 0 8 0 vmmpepl 168 44003 0 43015 85 13 72 72 0 357 29 vmsppl 368 487 0 473 2 0 2 2 0 8 0 pdppl 4096 983 0 946 6 0 6 6 0 8 1 pvpl 32 142315 0 138009 111 7 104 104 0 265 69 pmappl 232 487 0 473 1 0 1 1 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 233 0 4 7 0 7 7 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff826eeff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff828cb728) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828cb728) at __mp_lock+0x127 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:89 Xsoftclock() at Xsoftclock+0x1f acpicpu_idle() at acpicpu_idle+0x331 sys/dev/acpi/acpicpu.c:1187 sched_idle(ffffffff826eeff0) at sched_idle+0x3f7 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: 7 ddb{0}>