login: panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd807f01fd00+16 0x0!=0x556df1f0cfcfa309 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 33423 63453 0 0x2 0x4000480 1 syz-execprog *332182 4278 0 0x14000 0x40000200 0K softclock db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823e70d7) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff828e9bc8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828e9bc8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828e9bc8,2) 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(ffff800000aef100,83,0) 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(ffffffff8283ebe8) at pffasttimo+0x85 sys/kern/uipc_domain.c:292 timeout_run(ffffffff8283ebe8) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffffffff8283ebe8) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020d99860) 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 0xfffffd807f01fd00+16 0x0!=0x556df1f0cfcfa309 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823e70d7) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff828e9bc8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828e9bc8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828e9bc8,2) 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(ffff800000aef100,83,0) 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(ffffffff8283ebe8) at pffasttimo+0x85 sys/kern/uipc_domain.c:292 timeout_run(ffffffff8283ebe8) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffffffff8283ebe8) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020d99860) 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 0xffff800020da7320 rbx 0xffff800020da73d0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff817378df kprintf+0x16f r9 0x1 r10 0x2 r11 0xdf4ca3e22dc8238a r12 0x3000000008 r13 0xffff800020da7330 r14 0x100 r15 0x1 rip 0xffffffff81d71358 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020da7310 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (softclock) pid=332182 stat=onproc flags process=14000 proc=40000200 pri=0, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020d99ad0,0xffff800020d99390 process=0xffff800020d9af60 user=0xffff800020da2000, vmspace=0xffffffff828a99b8 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 21540 249034 63453 0 2 0x482 syz-executor.0 63453 358456 57481 0 3 0x82 thrsleep syz-execprog 63453 33423 57481 0 7 0x4000482 syz-execprog 63453 143823 57481 0 3 0x4000082 thrsleep syz-execprog 63453 386999 57481 0 3 0x4000082 thrsleep syz-execprog 63453 322547 57481 0 2 0x4000482 syz-execprog 63453 62898 57481 0 3 0x4000082 thrsleep syz-execprog 63453 438393 57481 0 3 0x4000082 thrsleep syz-execprog 63453 344950 57481 0 3 0x4000082 thrsleep syz-execprog 63453 225835 57481 0 3 0x4000082 kqread syz-execprog 57481 204292 74035 0 3 0x10008a pause ksh 74035 207192 3235 0 3 0x92 select sshd 81319 495447 1 0 3 0x100083 ttyin getty 3235 452312 1 0 3 0x80 select sshd 30193 304426 11123 74 3 0x100092 bpf pflogd 11123 399536 1 0 3 0x80 netio pflogd 41855 328941 91312 73 3 0x100090 kqread syslogd 91312 150684 1 0 3 0x100082 netio syslogd 32710 266798 1 77 3 0x100090 poll dhclient 6017 429651 1 0 3 0x80 poll dhclient 21798 103973 0 0 3 0x14200 bored smr 9236 486981 0 0 3 0x14200 pgzero zerothread 57166 380894 0 0 3 0x14200 aiodoned aiodoned 58049 409632 0 0 3 0x14200 syncer update 74132 192024 0 0 3 0x14200 cleaner cleaner 4838 182709 0 0 3 0x14200 reaper reaper 58038 329577 0 0 3 0x14200 pgdaemon pagedaemon 24698 283890 0 0 3 0x14200 bored crynlk 86577 141151 0 0 3 0x14200 bored crypto 9619 325722 0 0 3 0x40014200 acpi0 acpi0 77799 496051 0 0 3 0x40014200 idle1 70570 199505 0 0 3 0x14200 bored softnet 12681 152249 0 0 3 0x14200 bored systqmp 42422 76074 0 0 3 0x14200 bored systq * 4278 332182 0 0 7 0x40014200 softclock 13972 490307 0 0 3 0x40014200 idle0 1 33476 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 4278 (softclock) thread 0xffff800020d99860 (332182) exclusive rwlock netlock r = 0 (0xffffffff82766c38) #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 (0xffffffff8270b100) #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 (0xffffffff82910a70) #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 62 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 41 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 70 11K 12K 78643K 969 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 7 0K 0K 78643K 7 0 temp 29 3841K 3905K 78643K 1914 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 2 1 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 280 57 0 51 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 1447 0 45 88 0 88 88 0 8 0 ffsino 272 1447 0 45 94 0 94 94 0 8 0 nchpl 144 1688 0 85 60 0 60 60 0 8 0 uvmvnodes 72 1457 0 0 27 0 27 27 0 8 0 vnodes 208 1457 0 0 77 0 77 77 0 8 0 namei 1024 4302 0 4302 2 1 1 1 0 8 1 percpumem 16 31 0 0 1 0 1 1 0 8 0 scxspl 192 4527 0 4527 2 1 1 2 0 8 1 plimitpl 152 15 0 8 1 0 1 1 0 8 0 sigapl 424 264 0 235 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 496 249 0 235 3 0 3 3 0 8 0 filepl 152 1161 0 1103 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 144 235 0 234 2 1 1 1 0 8 0 processpl 984 264 0 234 5 0 5 5 0 8 1 procpl 624 272 0 234 4 0 4 4 0 8 1 sockpl 400 103 0 85 2 0 2 2 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 68 0 0 9 0 9 9 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 102 0 0 6 0 6 6 0 8 0 mbufpl: pool(0xffffffff828e9bc8:mbufpl): free list modified: page 0xfffffd806d816000; item ordinal 2; addr 0xfffffd806d816b00 (p 0xfffffd806db2a000); offset 0x0=0x0 pool(mbufpl): free list modified: page 0xfffffd806d816000; item ordinal 2; addr 0xfffffd806d816b00 (p 0xfffffd806db2a000); offset 0x0=0x0 mbufpl: pool(0xffffffff828e9bc8:mbufpl): page inconsistency: page 0xfffffd806d816000; item ordinal 3; addr 0xd5592a90d140937d bufpl 280 3069 0 133 210 0 210 210 0 8 0 anonpl 16 22843 0 21205 14 2 12 12 0 124 3 amapchunkpl 152 916 0 854 4 0 4 4 0 158 0 amappl16 192 219 0 184 2 0 2 2 0 8 0 amappl15 184 1 0 1 1 1 0 1 0 8 0 amappl14 176 56 0 50 1 0 1 1 0 8 0 amappl13 168 22 0 20 2 1 1 1 0 8 0 amappl12 160 26 0 25 2 1 1 1 0 8 0 amappl11 152 55 0 40 1 0 1 1 0 8 0 amappl10 144 14 0 12 1 0 1 1 0 8 0 amappl9 136 232 0 231 1 0 1 1 0 8 0 amappl8 128 268 0 261 1 0 1 1 0 8 0 amappl7 120 114 0 104 1 0 1 1 0 8 0 amappl6 112 21 0 18 3 2 1 1 0 8 0 amappl5 104 153 0 138 1 0 1 1 0 8 0 amappl4 96 494 0 468 1 0 1 1 0 8 0 amappl3 88 104 0 99 1 0 1 1 0 8 0 amappl2 80 981 0 920 3 1 2 2 0 8 0 amappl1 72 15658 0 15234 24 6 18 18 0 8 8 amappl 80 498 0 471 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 24 249 0 235 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 249 0 235 1 0 1 1 0 8 0 vmmpekpl 168 6417 0 6392 2 0 2 2 0 8 0 vmmpepl 168 33709 0 32781 85 13 72 72 0 357 30 vmsppl 368 248 0 235 2 0 2 2 0 8 0 pdppl 4096 505 0 470 6 0 6 6 0 8 1 pvpl 32 116413 0 112413 107 3 104 104 0 265 70 pmappl 232 248 0 235 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{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(ffffffff823e70d7) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff828e9bc8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828e9bc8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828e9bc8,2) 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(ffff800000aef100,83,0) 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(ffffffff8283ebe8) at pffasttimo+0x85 sys/kern/uipc_domain.c:292 timeout_run(ffffffff8283ebe8) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffffffff8283ebe8) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020d99860) at softclock_thread+0x16a sys/kern/kern_timeout.c:580 end trace frame: 0x0, count: -10 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020d80ff0) 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(ffffffff82910868) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82910868) at __mp_lock+0x127 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff82910868,1) at __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x392 sys/kern/sched_bsd.c:435 sleep_finish(ffff800020e90dd0,1) at sleep_finish+0x113 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800020e90dd0,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800020e90dd0,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(ffffffff828678b8,120,ffffffff823d7d65,2) at tsleep+0x1cc sys/kern/kern_synch.c:155 sys_nanosleep(ffff800020e5f390,ffff800020e90f00,ffff800020e90f50) at sys_nanosleep+0x205 sys/kern/kern_time.c:297 syscall(ffff800020e90fd0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e90fd0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc000045f38, count: 3 ddb{1}> trace x86_ipi_db(ffff800020d80ff0) 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(ffffffff82910868) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82910868) at __mp_lock+0x127 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff82910868,1) at __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x392 sys/kern/sched_bsd.c:435 sleep_finish(ffff800020e90dd0,1) at sleep_finish+0x113 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800020e90dd0,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800020e90dd0,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(ffffffff828678b8,120,ffffffff823d7d65,2) at tsleep+0x1cc sys/kern/kern_synch.c:155 sys_nanosleep(ffff800020e5f390,ffff800020e90f00,ffff800020e90f50) at sys_nanosleep+0x205 sys/kern/kern_time.c:297 syscall(ffff800020e90fd0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e90fd0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc000045f38, count: -12 ddb{1}>