login: panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806d785100+16 0x0!=0x7c1f881a84f9ffb5 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *435835 31037 0 0 0 0K syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821f8577) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82655688) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82655688) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82655688,2) 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(ffff8000009db600,800100,ffff8000009db640,0) at rt_ifa_del+0xa1 sys/net/route.c:1163 in6_unlink_ifa(ffff8000009db600,ffff8000009d5000) at in6_unlink_ifa+0x571 sys/netinet6/in6.c:943 in6_update_ifa(ffff8000009d5000,ffff800020f5f4c0,0) at in6_update_ifa+0x13f7 sys/netinet6/in6.c:875 in6_ioctl_change_ifaddr(8080691a,ffff800020f5f4c0,ffff8000009d5000) at in6_ioctl_change_ifaddr+0x40c sys/netinet6/in6.c:352 ifioctl(fffffd806eb3ae18,8080691a,ffff800020f5f4c0,ffff800020e6cc38) at ifioctl+0xe70 sys/net/if.c:2289 soo_ioctl(fffffd806d0acc88,8080691a,ffff800020f5f4c0,ffff800020e6cc38) at soo_ioctl+0x27c sys/kern/sys_socket.c:138 sys_ioctl(ffff800020e6cc38,ffff800020f5f5d8,ffff800020f5f620) at sys_ioctl+0x4a5 syscall(ffff800020f5f6a0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020f5f6a0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeeb00, 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{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 0xfffffd806d785100+16 0x0!=0x7c1f881a84f9ffb5 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821f8577) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82655688) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82655688) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82655688,2) 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(ffff8000009db600,800100,ffff8000009db640,0) at rt_ifa_del+0xa1 sys/net/route.c:1163 in6_unlink_ifa(ffff8000009db600,ffff8000009d5000) at in6_unlink_ifa+0x571 sys/netinet6/in6.c:943 in6_update_ifa(ffff8000009d5000,ffff800020f5f4c0,0) at in6_update_ifa+0x13f7 sys/netinet6/in6.c:875 in6_ioctl_change_ifaddr(8080691a,ffff800020f5f4c0,ffff8000009d5000) at in6_ioctl_change_ifaddr+0x40c sys/netinet6/in6.c:352 ifioctl(fffffd806eb3ae18,8080691a,ffff800020f5f4c0,ffff800020e6cc38) at ifioctl+0xe70 sys/net/if.c:2289 soo_ioctl(fffffd806d0acc88,8080691a,ffff800020f5f4c0,ffff800020e6cc38) at soo_ioctl+0x27c sys/kern/sys_socket.c:138 sys_ioctl(ffff800020e6cc38,ffff800020f5f5d8,ffff800020f5f620) at sys_ioctl+0x4a5 syscall(ffff800020f5f6a0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020f5f6a0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeeb00, count: -14 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020f5ed30 rbx 0xffff800020f5ede0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff813f10ef kprintf+0x16f r9 0x1 r10 0x5265a0c5828fd4cb r11 0xafb425c33bb9caee r12 0x3000000008 r13 0xffff800020f5ed40 r14 0x100 r15 0x1 rip 0xffffffff81d6d978 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020f5ed20 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=435835 stat=onproc flags process=0 proc=0 pri=57, usrpri=57, nice=20 forw=0xffffffffffffffff, list=0xffff800020e6dd48,0xffffffff8266d478 process=0xffff800020e81af8 user=0xffff800020f5a000, vmspace=0xfffffd807f000450 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *31037 435835 69969 0 7 0 syz-executor.0 69969 366296 60677 0 3 0x82 nanosleep syz-executor.0 60677 126734 69500 0 3 0x82 kqread syz-execprog 60677 286876 69500 0 3 0x4000082 nanosleep syz-execprog 60677 353817 69500 0 3 0x4000082 thrsleep syz-execprog 60677 431426 69500 0 3 0x4000082 thrsleep syz-execprog 60677 151237 69500 0 3 0x4000082 thrsleep syz-execprog 60677 91299 69500 0 3 0x4000082 thrsleep syz-execprog 60677 57064 69500 0 3 0x4000082 thrsleep syz-execprog 60677 406538 69500 0 3 0x4000082 thrsleep syz-execprog 60677 132897 69500 0 3 0x4000082 nanosleep syz-execprog 69500 269735 98711 0 3 0x10008a pause ksh 98711 103262 12315 0 3 0x92 select sshd 20515 184255 1 0 3 0x100083 ttyin getty 12315 229485 1 0 3 0x80 select sshd 24302 501205 13515 74 3 0x100092 bpf pflogd 13515 113072 1 0 3 0x80 netio pflogd 66805 374248 20620 73 3 0x100090 kqread syslogd 20620 321725 1 0 3 0x100082 netio syslogd 67606 66237 1 77 3 0x100090 poll dhclient 23120 242773 1 0 3 0x80 poll dhclient 97268 501689 0 0 3 0x14200 bored smr 31924 114196 0 0 3 0x14200 pgzero zerothread 13673 85164 0 0 3 0x14200 aiodoned aiodoned 36925 124976 0 0 3 0x14200 syncer update 93304 423754 0 0 3 0x14200 cleaner cleaner 18366 472641 0 0 3 0x14200 reaper reaper 66112 148149 0 0 3 0x14200 pgdaemon pagedaemon 14765 130634 0 0 3 0x14200 bored crynlk 58810 270178 0 0 3 0x14200 bored crypto 17546 295571 0 0 3 0x40014200 acpi0 acpi0 9558 32082 0 0 7 0x40014200 idle1 85964 25666 0 0 3 0x14200 bored softnet 62542 102090 0 0 3 0x14200 bored systqmp 58275 174383 0 0 3 0x14200 bored systq 69048 231365 0 0 3 0x40014200 bored softclock 76948 454740 0 0 3 0x40014200 idle0 1 215436 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 31037 (syz-executor.0) thread 0xffff800020e6cc38 (435835) exclusive rwlock netlock r = 0 (0xffffffff82505e18) #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:2289 #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 (0xffffffff82655658) #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9466 6395K 6395K 78643K 10557 0 pcb 13 8K 8K 78643K 13 0 rtable 83 2K 2K 78643K 163 0 ifaddr 38 9K 9K 78643K 121 0 counters 41 33K 33K 78643K 41 0 ioctlops 0 0K 4K 78643K 1468 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 1809 196K 290K 78643K 12766 0 file desc 3 8K 12K 78643K 100 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 80 12K 12K 78643K 1036 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 3033K 3097K 78643K 2030 0 kqueue 3 4K 4K 78643K 3 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 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 1 0 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 280 116 0 109 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 0 1 0 1 1 0 8 0 pfstkey 112 10 0 0 1 0 1 1 0 8 0 pfstate 328 10 0 0 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 256 145 0 0 10 0 10 10 0 8 0 art_table 32 146 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 1506 0 104 88 0 88 88 0 8 0 ffsino 272 1506 0 104 94 0 94 94 0 8 0 nchpl 144 1804 0 203 60 0 60 60 0 8 0 uvmvnodes 72 1516 0 0 28 0 28 28 0 8 0 vnodes 208 1516 0 0 80 0 80 80 0 8 0 namei 1024 4532 0 4532 1 0 1 1 0 8 1 percpumem 16 31 0 0 1 0 1 1 0 8 0 scxspl 192 4309 0 4309 2 1 1 2 0 8 1 plimitpl 152 15 0 8 1 0 1 1 0 8 0 sigapl 424 323 0 293 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 1 0 1 1 0 8 0 pipepl 120 154 0 141 1 0 1 1 0 8 0 fdescpl 496 308 0 293 3 0 3 3 0 8 0 filepl 152 1273 0 1214 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 144 293 0 293 1 0 1 1 0 8 1 processpl 984 323 0 293 5 0 5 5 0 8 1 procpl 624 331 0 293 4 0 4 4 0 8 1 sockpl 400 162 0 143 2 0 2 2 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 72 0 0 9 0 9 9 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 93 0 0 6 0 6 6 0 8 0 mbufpl: pool(0xffffffff82655688:mbufpl): free list modified: page 0xfffffd806d785000; item ordinal 1; addr 0xfffffd806d785400 (p 0xfffffd806dfa2000); offset 0x0=0x0 mbufpl: pool(0xffffffff82655688:mbufpl): page inconsistency: page 0xfffffd806d785000; item ordinal 2; addr 0x278c364d424aef93 bufpl 280 3062 0 133 210 0 210 210 0 8 0 anonpl 16 24852 0 22557 13 1 12 12 0 124 2 amapchunkpl 152 818 0 731 5 0 5 5 0 158 1 amappl16 192 589 0 511 4 0 4 4 0 8 0 amappl15 184 3 0 1 1 0 1 1 0 8 0 amappl14 176 31 0 26 1 0 1 1 0 8 0 amappl13 168 20 0 19 1 0 1 1 0 8 0 amappl12 160 7 0 4 1 0 1 1 0 8 0 amappl11 152 55 0 39 1 0 1 1 0 8 0 amappl10 144 19 0 16 1 0 1 1 0 8 0 amappl9 136 227 0 226 1 0 1 1 0 8 0 amappl8 128 276 0 267 1 0 1 1 0 8 0 amappl7 120 122 0 110 1 0 1 1 0 8 0 amappl6 112 26 0 24 1 0 1 1 0 8 0 amappl5 104 211 0 196 1 0 1 1 0 8 0 amappl4 96 496 0 468 1 0 1 1 0 8 0 amappl3 88 105 0 99 1 0 1 1 0 8 0 amappl2 80 1078 0 1017 2 0 2 2 0 8 0 amappl1 72 15974 0 15545 24 6 18 18 0 8 8 amappl 80 561 0 530 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 24 308 0 293 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 308 0 293 1 0 1 1 0 8 0 vmmpekpl 168 6493 0 6468 2 0 2 2 0 8 0 vmmpepl 168 35808 0 34797 79 7 72 72 0 357 28 vmsppl 368 307 0 293 2 0 2 2 0 8 0 pdppl 4096 624 0 586 6 0 6 6 0 8 0 pvpl 32 122750 0 118015 104 0 104 104 0 265 65 pmappl 232 307 0 293 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 232 0 3 7 0 7 7 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821f8577) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82655688) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82655688) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82655688,2) 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(ffff8000009db600,800100,ffff8000009db640,0) at rt_ifa_del+0xa1 sys/net/route.c:1163 in6_unlink_ifa(ffff8000009db600,ffff8000009d5000) at in6_unlink_ifa+0x571 sys/netinet6/in6.c:943 in6_update_ifa(ffff8000009d5000,ffff800020f5f4c0,0) at in6_update_ifa+0x13f7 sys/netinet6/in6.c:875 in6_ioctl_change_ifaddr(8080691a,ffff800020f5f4c0,ffff8000009d5000) at in6_ioctl_change_ifaddr+0x40c sys/netinet6/in6.c:352 ifioctl(fffffd806eb3ae18,8080691a,ffff800020f5f4c0,ffff800020e6cc38) at ifioctl+0xe70 sys/net/if.c:2289 soo_ioctl(fffffd806d0acc88,8080691a,ffff800020f5f4c0,ffff800020e6cc38) at soo_ioctl+0x27c sys/kern/sys_socket.c:138 sys_ioctl(ffff800020e6cc38,ffff800020f5f5d8,ffff800020f5f620) at sys_ioctl+0x4a5 syscall(ffff800020f5f6a0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020f5f6a0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeeb00, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020e00ff0) 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 acpicpu_idle() at acpicpu_idle+0x331 sys/dev/acpi/acpicpu.c:1187 sched_idle(ffff800020e00ff0) at sched_idle+0x3f7 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800020e00ff0) 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 acpicpu_idle() at acpicpu_idle+0x331 sys/dev/acpi/acpicpu.c:1187 sched_idle(ffff800020e00ff0) at sched_idle+0x3f7 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: -5 ddb{1}>