login: panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806f2dda00+16 0x0!=0x4e862f3f1504d4b Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *352985 24179 0 0x14000 0x40000200 0K softclock db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823fdadd) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff828cba90) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828cba90) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828cba90,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(2,1) at m_get+0x4c sys/kern/uipc_mbuf.c:250 mld6_sendpkt(ffff800000aa0980,83,0) at mld6_sendpkt+0xaf sys/netinet6/mld6.c:410 mld6_fasttimeo() at mld6_fasttimeo+0x162 mld6_checktimer sys/netinet6/mld6.c:363 [inline] mld6_fasttimeo() at mld6_fasttimeo+0x162 sys/netinet6/mld6.c:341 pffasttimo(ffffffff827d2938) at pffasttimo+0x85 sys/kern/uipc_domain.c:292 timeout_run(ffffffff827d2938) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffffffff827d2938) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020d88c30) at softclock_thread+0x16a sys/kern/kern_timeout.c:580 end trace frame: 0x0, count: 5 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 0xfffffd806f2dda00+16 0x0!=0x4e862f3f1504d4b ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823fdadd) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff828cba90) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828cba90) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828cba90,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(2,1) at m_get+0x4c sys/kern/uipc_mbuf.c:250 mld6_sendpkt(ffff800000aa0980,83,0) at mld6_sendpkt+0xaf sys/netinet6/mld6.c:410 mld6_fasttimeo() at mld6_fasttimeo+0x162 mld6_checktimer sys/netinet6/mld6.c:363 [inline] mld6_fasttimeo() at mld6_fasttimeo+0x162 sys/netinet6/mld6.c:341 pffasttimo(ffffffff827d2938) at pffasttimo+0x85 sys/kern/uipc_domain.c:292 timeout_run(ffffffff827d2938) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffffffff827d2938) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020d88c30) at softclock_thread+0x16a sys/kern/kern_timeout.c:580 end trace frame: 0x0, count: -10 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020d96ea0 rbx 0xffff800020d96f50 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff8169567f kprintf+0x16f r9 0x1 r10 0x2 r11 0xb3ad095ddfbd727b r12 0x3000000008 r13 0xffff800020d96eb0 r14 0x100 r15 0x1 rip 0xffffffff8138f5b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020d96e90 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (softclock) pid=352985 stat=onproc flags process=14000 proc=40000200 pri=0, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020d88ea0,0xffff800020d889d0 process=0xffff800020d8af80 user=0xffff800020d92000, vmspace=0xffffffff828d40a8 estcpu=1, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 41070 65596 70517 0 3 0x82 nanosleep syz-executor.0 70517 249146 24290 0 3 0x82 kqread syz-execprog 70517 66671 24290 0 3 0x4000082 nanosleep syz-execprog 70517 511130 24290 0 3 0x4000082 thrsleep syz-execprog 70517 21403 24290 0 3 0x4000082 thrsleep syz-execprog 70517 482617 24290 0 3 0x4000082 thrsleep syz-execprog 70517 243571 24290 0 3 0x4000082 thrsleep syz-execprog 70517 69220 24290 0 3 0x4000082 thrsleep syz-execprog 70517 404196 24290 0 3 0x4000082 nanosleep syz-execprog 70517 182034 24290 0 3 0x4000082 thrsleep syz-execprog 24290 182912 87016 0 3 0x10008a pause ksh 87016 415939 16035 0 3 0x92 select sshd 53601 62329 1 0 3 0x100083 ttyin getty 16035 396924 1 0 3 0x80 select sshd 40479 276107 17834 74 3 0x100092 bpf pflogd 17834 228166 1 0 3 0x80 netio pflogd 37184 152372 96262 73 3 0x100090 kqread syslogd 96262 110713 1 0 3 0x100082 netio syslogd 24891 475416 1 77 3 0x100090 poll dhclient 92308 291331 1 0 3 0x80 poll dhclient 10041 144510 0 0 3 0x14200 bored smr 19117 234492 0 0 3 0x14200 pgzero zerothread 34491 516667 0 0 3 0x14200 aiodoned aiodoned 57489 314320 0 0 3 0x14200 syncer update 37544 346233 0 0 3 0x14200 cleaner cleaner 49879 495253 0 0 3 0x14200 reaper reaper 55172 286891 0 0 3 0x14200 pgdaemon pagedaemon 37320 407176 0 0 3 0x14200 bored crynlk 51801 267538 0 0 3 0x14200 bored crypto 57485 439886 0 0 3 0x40014200 acpi0 acpi0 49644 296525 0 0 7 0x40014200 idle1 77848 330893 0 0 3 0x14200 bored softnet 67529 471136 0 0 3 0x14200 bored systqmp 4758 203839 0 0 3 0x14200 bored systq *24179 352985 0 0 7 0x40014200 softclock 55061 97709 0 0 3 0x40014200 idle0 1 172214 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 24179 (softclock) thread 0xffff800020d88c30 (352985) exclusive rwlock netlock r = 0 (0xffffffff82711af8) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 mld6_fasttimeo+0x1d sys/netinet6/mld6.c:336 #2 pffasttimo+0x85 sys/kern/uipc_domain.c:292 #3 timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] #3 timeout_run+0xc4 sys/kern/kern_timeout.c:490 #4 softclock_thread+0x16a sys/kern/kern_timeout.c:580 #5 proc_trampoline+0x1c shared rwlock timeout r = 0 (0xffffffff82721930) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 timeout_run+0xb9 sys/kern/kern_timeout.c:489 #2 softclock_thread+0x16a sys/kern/kern_timeout.c:580 #3 proc_trampoline+0x1c exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828eb410) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 #2 mi_switch+0x392 sys/kern/sched_bsd.c:435 #3 sleep_finish+0x113 sys/kern/kern_synch.c:418 #4 softclock_thread+0x103 sys/kern/kern_timeout.c:575 #5 proc_trampoline+0x1c ddb{0}> 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 37 9K 9K 78643K 307 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 1824 197K 290K 78643K 13058 0 file desc 2 4K 12K 78643K 286 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 75 12K 12K 78643K 1214 0 UVM aobj 3 2K 2K 78643K 3 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 2410 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 1 0 1 0 8 0 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 296 302 0 296 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 11 0 0 1 0 1 1 0 8 0 pfstkey 112 11 0 0 1 0 1 1 0 8 0 pfstate 328 11 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 1692 0 290 88 0 88 88 0 8 0 ffsino 272 1692 0 290 94 0 94 94 0 8 0 nchpl 144 2179 0 575 60 0 60 60 0 8 0 uvmvnodes 72 1702 0 0 31 0 31 31 0 8 0 vnodes 208 1702 0 0 90 0 90 90 0 8 0 namei 1024 5302 0 5302 1 0 1 1 0 8 1 percpumem 16 31 0 0 1 0 1 1 0 8 0 scxspl 192 6222 0 6222 8 1 7 7 0 8 7 plimitpl 152 15 0 8 1 0 1 1 0 8 0 sigapl 424 509 0 480 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 pipepl 304 77 0 70 1 0 1 1 0 8 0 fdescpl 496 494 0 480 3 0 3 3 0 8 0 filepl 152 1652 0 1594 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 144 480 0 479 1 0 1 1 0 8 0 processpl 992 509 0 479 5 0 5 5 0 8 1 procpl 624 517 0 479 3 0 3 3 0 8 0 sockpl 400 348 0 330 2 0 2 2 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 56 0 0 7 0 7 7 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 100 0 0 5 0 5 5 0 8 0 mbufpl: pool(0xffffffff828cba90:mbufpl): free list modified: page 0xfffffd806f2dd000; item ordinal 0; addr 0xfffffd806f2dd600 (p 0xfffffd806f4b2000); offset 0x0=0x0 pool(mbufpl): free list modified: page 0xfffffd806f2dd000; item ordinal 0; addr 0xfffffd806f2dd600 (p 0xfffffd806f4b2000); offset 0x0=0x0 mbufpl: pool(0xffffffff828cba90:mbufpl): page inconsistency: page 0xfffffd806f2dd000; item ordinal 1; addr 0x2e8eac7be9792ed1 bufpl 280 3317 0 132 228 0 228 228 0 8 0 anonpl 16 29326 0 27521 13 1 12 12 0 124 4 amapchunkpl 152 1092 0 1026 5 0 5 5 0 158 1 amappl16 192 1227 0 1183 3 0 3 3 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 31 0 26 1 0 1 1 0 8 0 amappl13 168 25 0 22 1 0 1 1 0 8 0 amappl12 160 15 0 11 2 1 1 1 0 8 0 amappl11 152 325 0 309 1 0 1 1 0 8 0 amappl10 144 15 0 13 1 0 1 1 0 8 0 amappl9 136 234 0 233 1 0 1 1 0 8 0 amappl8 128 269 0 262 1 0 1 1 0 8 0 amappl7 120 114 0 103 1 0 1 1 0 8 0 amappl6 112 290 0 287 3 2 1 1 0 8 0 amappl5 104 393 0 379 1 0 1 1 0 8 0 amappl4 96 493 0 468 1 0 1 1 0 8 0 amappl3 88 105 0 100 1 0 1 1 0 8 0 amappl2 80 1449 0 1392 2 0 2 2 0 8 0 amappl1 72 17469 0 17048 23 5 18 18 0 8 8 amappl 80 743 0 715 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 494 0 480 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 494 0 480 1 0 1 1 0 8 0 vmmpekpl 168 6953 0 6926 2 0 2 2 0 8 0 vmmpepl 168 44963 0 44016 81 8 73 73 0 357 29 vmsppl 368 493 0 480 2 0 2 2 0 8 0 pdppl 4096 995 0 960 6 0 6 6 0 8 1 pvpl 32 143054 0 138872 104 0 104 104 0 265 70 pmappl 232 493 0 480 1 0 1 1 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 228 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(ffffffff823fdadd) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff828cba90) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828cba90) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828cba90,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(2,1) at m_get+0x4c sys/kern/uipc_mbuf.c:250 mld6_sendpkt(ffff800000aa0980,83,0) at mld6_sendpkt+0xaf sys/netinet6/mld6.c:410 mld6_fasttimeo() at mld6_fasttimeo+0x162 mld6_checktimer sys/netinet6/mld6.c:363 [inline] mld6_fasttimeo() at mld6_fasttimeo+0x162 sys/netinet6/mld6.c:341 pffasttimo(ffffffff827d2938) at pffasttimo+0x85 sys/kern/uipc_domain.c:292 timeout_run(ffffffff827d2938) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffffffff827d2938) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020d88c30) at softclock_thread+0x16a sys/kern/kern_timeout.c:580 end trace frame: 0x0, count: -10 ddb{0}>