panic: pool_do_get: mbufpl free list modified: page 0xfffffd806f627000; item addr 0xfffffd806f627300; offset 0x0=0xc2dace9d42be0000 != 0xc2dace9d42bef8c9 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *373195 35355 0 0x14000 0x40000200 0K softclock db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82494b79) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff828b8b28,2,ffff800020d971a8) at pool_do_get+0x439 sys/kern/subr_pool.c:738 pool_get(ffffffff828b8b28,2) at pool_get+0xeb sys/kern/subr_pool.c:581 m_get(2,1) at m_get+0x4c sys/kern/uipc_mbuf.c:250 ip6_output(fffffd807f01eb00,ffffffff827b6ad8,0,0,ffff800020d973f8,0) at ip6_output+0x203 sys/netinet6/ip6_output.c:198 mld6_sendpkt(ffff800000af1080,83,0) at mld6_sendpkt+0x2da sys/netinet6/mld6.c:465 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(ffffffff827b6ba0) at pffasttimo+0x85 sys/kern/uipc_domain.c:292 timeout_run(ffffffff827b6ba0) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffffffff827b6ba0) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020d89860) at softclock_thread+0x16a sys/kern/kern_timeout.c:580 end trace frame: 0x0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic pool_do_get: mbufpl free list modified: page 0xfffffd806f627000; item addr 0xfffffd806f627300; offset 0x0=0xc2dace9d42be0000 != 0xc2dace9d42bef8c9 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82494b79) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff828b8b28,2,ffff800020d971a8) at pool_do_get+0x439 sys/kern/subr_pool.c:738 pool_get(ffffffff828b8b28,2) at pool_get+0xeb sys/kern/subr_pool.c:581 m_get(2,1) at m_get+0x4c sys/kern/uipc_mbuf.c:250 ip6_output(fffffd807f01eb00,ffffffff827b6ad8,0,0,ffff800020d973f8,0) at ip6_output+0x203 sys/netinet6/ip6_output.c:198 mld6_sendpkt(ffff800000af1080,83,0) at mld6_sendpkt+0x2da sys/netinet6/mld6.c:465 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(ffffffff827b6ba0) at pffasttimo+0x85 sys/kern/uipc_domain.c:292 timeout_run(ffffffff827b6ba0) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffffffff827b6ba0) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020d89860) at softclock_thread+0x16a sys/kern/kern_timeout.c:580 end trace frame: 0x0, count: -11 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020d96ff0 rbx 0xffff800020d970a0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff811209cf kprintf+0x16f r9 0x1 r10 0x2 r11 0x4a0f0fc77aea8859 r12 0x3000000008 r13 0xffff800020d97000 r14 0x100 r15 0x1 rip 0xffffffff81de3468 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020d96fe0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (softclock) pid=373195 stat=onproc flags process=14000 proc=40000200 pri=0, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020d89ad0,0xffff800020d89600 process=0xffff800020d8a7c0 user=0xffff800020d92000, vmspace=0xffffffff828fddc8 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 9554 460333 62835 0 3 0x82 nanosleep syz-executor.0 62835 209642 11912 0 3 0x82 thrsleep syz-execprog 62835 474067 11912 0 3 0x4000082 nanosleep syz-execprog 62835 289061 11912 0 3 0x4000082 thrsleep syz-execprog 62835 82115 11912 0 3 0x4000082 thrsleep syz-execprog 62835 475449 11912 0 3 0x4000082 nanosleep syz-execprog 62835 97301 11912 0 3 0x4000082 thrsleep syz-execprog 62835 7270 11912 0 3 0x4000082 kqread syz-execprog 62835 505437 11912 0 3 0x4000082 thrsleep syz-execprog 62835 101179 11912 0 3 0x4000082 thrsleep syz-execprog 11912 507991 14839 0 3 0x10008a pause ksh 14839 451740 64841 0 3 0x92 select sshd 64937 416489 1 0 3 0x100083 ttyin getty 64841 36114 1 0 3 0x80 select sshd 64025 178748 33945 74 3 0x100092 bpf pflogd 33945 346214 1 0 3 0x80 netio pflogd 69970 442473 4796 73 3 0x100090 kqread syslogd 4796 327284 1 0 3 0x100082 netio syslogd 76142 3852 1 77 3 0x100090 poll dhclient 46240 14608 1 0 3 0x80 poll dhclient 87479 265 0 0 3 0x14200 bored smr 84567 464269 0 0 3 0x14200 pgzero zerothread 2544 91006 0 0 3 0x14200 aiodoned aiodoned 267 136684 0 0 3 0x14200 syncer update 12393 524133 0 0 3 0x14200 cleaner cleaner 4339 38430 0 0 3 0x14200 reaper reaper 73298 52072 0 0 3 0x14200 pgdaemon pagedaemon 88672 305274 0 0 3 0x14200 bored crynlk 27511 145426 0 0 3 0x14200 bored crypto 60501 227897 0 0 3 0x40014200 acpi0 acpi0 76195 198866 0 0 7 0x40014200 idle1 43573 152321 0 0 3 0x14200 bored softnet 35105 229159 0 0 3 0x14200 bored systqmp 76884 186979 0 0 3 0x14200 bored systq *35355 373195 0 0 7 0x40014200 softclock 45903 351880 0 0 3 0x40014200 idle0 1 43198 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex mbufpl r = 0 (0xffffffff828b8b38) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pool_get+0xbf sys/kern/subr_pool.c:578 #4 m_get+0x4c sys/kern/uipc_mbuf.c:250 #5 ip6_output+0x203 sys/netinet6/ip6_output.c:198 #6 mld6_sendpkt+0x2da sys/netinet6/mld6.c:465 #7 mld6_fasttimeo+0x162 mld6_checktimer sys/netinet6/mld6.c:363 [inline] #7 mld6_fasttimeo+0x162 sys/netinet6/mld6.c:341 #8 pffasttimo+0x85 sys/kern/uipc_domain.c:292 #9 timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] #9 timeout_run+0xc4 sys/kern/kern_timeout.c:490 #10 softclock_thread+0x16a sys/kern/kern_timeout.c:580 #11 proc_trampoline+0x1c Process 35355 (softclock) thread 0xffff800020d89860 (373195) exclusive rwlock netlock r = 0 (0xffffffff8275f668) #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 (0xffffffff82711fc0) #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 (0xffffffff82919f20) #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 exclusive mutex mbufpl r = 0 (0xffffffff828b8b38) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pool_get+0xbf sys/kern/subr_pool.c:578 #4 m_get+0x4c sys/kern/uipc_mbuf.c:250 #5 ip6_output+0x203 sys/netinet6/ip6_output.c:198 #6 mld6_sendpkt+0x2da sys/netinet6/mld6.c:465 #7 mld6_fasttimeo+0x162 mld6_checktimer sys/netinet6/mld6.c:363 [inline] #7 mld6_fasttimeo+0x162 sys/netinet6/mld6.c:341 #8 pffasttimo+0x85 sys/kern/uipc_domain.c:292 #9 timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] #9 timeout_run+0xc4 sys/kern/kern_timeout.c:490 #10 softclock_thread+0x16a sys/kern/kern_timeout.c:580 #11 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 292 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 271 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 74 12K 12K 78643K 1204 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 2380 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 120 537 0 527 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 296 541 0 535 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 7 1 0 1 1 0 8 0 pfstkey 112 11 0 7 1 0 1 1 0 8 0 pfstate 328 11 0 7 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 1677 0 275 88 0 88 88 0 8 0 ffsino 272 1677 0 275 94 0 94 94 0 8 0 nchpl 144 2149 0 545 60 0 60 60 0 8 0 uvmvnodes 72 1687 0 0 31 0 31 31 0 8 0 vnodes 208 1687 0 0 89 0 89 89 0 8 0 namei 1024 5242 0 5242 2 1 1 1 0 8 1 percpumem 16 31 0 0 1 0 1 1 0 8 0 scxspl 192 6148 0 6148 11 10 1 7 0 8 1 plimitpl 152 15 0 8 1 0 1 1 0 8 0 sigapl 424 494 0 465 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 2 1 1 1 0 8 0 fdescpl 496 479 0 465 3 0 3 3 0 8 0 filepl 152 2384 0 2326 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 144 465 0 464 2 1 1 1 0 8 0 processpl 992 494 0 464 5 0 5 5 0 8 1 procpl 624 502 0 464 4 0 4 4 0 8 1 sockpl 400 1095 0 1077 3 0 3 3 0 8 1 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 62 0 0 8 0 8 8 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 92 0 0 5 0 5 5 0 8 0 mbufpl: pool(0xffffffff828b8b28:mbufpl): free list modified: page 0xfffffd806f627000; item ordinal 0; addr 0xfffffd806f627300 (p 0xfffffd806f29f000); offset 0x0=0xc2dace9d42be0000 bufpl 280 3304 0 133 227 0 227 227 0 8 0 anonpl 16 29193 0 27140 15 2 13 13 0 124 4 amapchunkpl 152 1083 0 1017 4 0 4 4 0 158 0 amappl16 192 1188 0 1126 4 0 4 4 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 42 0 35 1 0 1 1 0 8 0 amappl13 168 22 0 20 2 1 1 1 0 8 0 amappl12 160 4 0 2 2 1 1 1 0 8 0 amappl11 152 52 0 37 1 0 1 1 0 8 0 amappl10 144 19 0 16 1 0 1 1 0 8 0 amappl9 136 487 0 485 1 0 1 1 0 8 0 amappl8 128 524 0 516 1 0 1 1 0 8 0 amappl7 120 115 0 103 1 0 1 1 0 8 0 amappl6 112 21 0 19 2 1 1 1 0 8 0 amappl5 104 379 0 365 1 0 1 1 0 8 0 amappl4 96 498 0 469 1 0 1 1 0 8 0 amappl3 88 108 0 103 1 0 1 1 0 8 0 amappl2 80 1419 0 1363 3 1 2 2 0 8 0 amappl1 72 17241 0 16820 23 5 18 18 0 8 8 amappl 80 731 0 703 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 24 479 0 465 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 479 0 465 1 0 1 1 0 8 0 vmmpekpl 168 6676 0 6648 2 0 2 2 0 8 0 vmmpepl 168 44081 0 43110 83 10 73 73 0 357 30 vmsppl 368 478 0 465 2 0 2 2 0 8 0 pdppl 4096 965 0 930 6 0 6 6 0 8 1 pvpl 32 141531 0 137103 111 6 105 105 0 265 68 pmappl 232 478 0 465 1 0 1 1 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 232 0 4 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(ffffffff82494b79) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff828b8b28,2,ffff800020d971a8) at pool_do_get+0x439 sys/kern/subr_pool.c:738 pool_get(ffffffff828b8b28,2) at pool_get+0xeb sys/kern/subr_pool.c:581 m_get(2,1) at m_get+0x4c sys/kern/uipc_mbuf.c:250 ip6_output(fffffd807f01eb00,ffffffff827b6ad8,0,0,ffff800020d973f8,0) at ip6_output+0x203 sys/netinet6/ip6_output.c:198 mld6_sendpkt(ffff800000af1080,83,0) at mld6_sendpkt+0x2da sys/netinet6/mld6.c:465 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(ffffffff827b6ba0) at pffasttimo+0x85 sys/kern/uipc_domain.c:292 timeout_run(ffffffff827b6ba0) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffffffff827b6ba0) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020d89860) at softclock_thread+0x16a sys/kern/kern_timeout.c:580 end trace frame: 0x0, count: -11 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020d70ff0) 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(ffff800020d70ff0) at sched_idle+0x3f7 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800020d70ff0) 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(ffff800020d70ff0) at sched_idle+0x3f7 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: -5