panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd80743c3b00+16 0x0!=0x79f55f2e4b0786f9 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *366019 73785 0 0x14000 0x40000200 0K softclock db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821fc6cc) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff826b4128) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff826b4128) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff826b4128,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(2,3) at m_get+0x4c sys/kern/uipc_mbuf.c:250 sbappendaddr(fffffd806f6e1190,fffffd806f6e1218,ffffffff82408058,fffffd807f01e900,0) at sbappendaddr+0x2e9 sys/kern/uipc_socket2.c:804 rtm_sendup(fffffd806f6e1190,fffffd807f01e900,0) at rtm_sendup+0xef sys/net/rtsock.c:594 route_input(fffffd807f01e900,0,18) at route_input+0x489 sys/net/rtsock.c:572 rtm_addr(14,ffff800000a0cc00) at rtm_addr+0x10b sys/net/rtsock.c:1751 nd6_dad_timer(ffff800000a0cc00) at nd6_dad_timer+0x2f9 sys/netinet6/nd6_nbr.c:1244 timeout_run(ffff8000009da830) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffff8000009da830) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020e18c30) at softclock_thread+0x16a sys/kern/kern_timeout.c:580 end trace frame: 0x0, count: 3 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 0xfffffd80743c3b00+16 0x0!=0x79f55f2e4b0786f9 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821fc6cc) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff826b4128) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff826b4128) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff826b4128,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(2,3) at m_get+0x4c sys/kern/uipc_mbuf.c:250 sbappendaddr(fffffd806f6e1190,fffffd806f6e1218,ffffffff82408058,fffffd807f01e900,0) at sbappendaddr+0x2e9 sys/kern/uipc_socket2.c:804 rtm_sendup(fffffd806f6e1190,fffffd807f01e900,0) at rtm_sendup+0xef sys/net/rtsock.c:594 route_input(fffffd807f01e900,0,18) at route_input+0x489 sys/net/rtsock.c:572 rtm_addr(14,ffff800000a0cc00) at rtm_addr+0x10b sys/net/rtsock.c:1751 nd6_dad_timer(ffff800000a0cc00) at nd6_dad_timer+0x2f9 sys/netinet6/nd6_nbr.c:1244 timeout_run(ffff8000009da830) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffff8000009da830) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020e18c30) at softclock_thread+0x16a sys/kern/kern_timeout.c:580 end trace frame: 0x0, count: -12 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020e26c10 rbx 0xffff800020e26cc0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff816a48af kprintf+0x16f r9 0x1 r10 0x2 r11 0xe978757336f6f965 r12 0x3000000008 r13 0xffff800020e26c20 r14 0x100 r15 0x1 rip 0xffffffff81a150c8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020e26c00 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (softclock) pid=366019 stat=onproc flags process=14000 proc=40000200 pri=0, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020e19110,0xffff800020e184f0 process=0xffff800020e1b338 user=0xffff800020e22000, vmspace=0xffffffff826b9dc0 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 91095 221310 79472 0 3 0x82 nanosleep syz-executor.0 79472 131469 54248 0 3 0x82 thrsleep syz-execprog 79472 345750 54248 0 3 0x4000082 nanosleep syz-execprog 79472 437660 54248 0 3 0x4000082 kqread syz-execprog 79472 334694 54248 0 3 0x4000082 thrsleep syz-execprog 79472 405579 54248 0 3 0x4000082 thrsleep syz-execprog 79472 486053 54248 0 3 0x4000082 thrsleep syz-execprog 79472 451288 54248 0 3 0x4000082 thrsleep syz-execprog 79472 233475 54248 0 3 0x4000082 thrsleep syz-execprog 79472 164322 54248 0 3 0x4000082 nanosleep syz-execprog 54248 474081 7660 0 3 0x10008a pause ksh 7660 485496 60555 0 3 0x92 select sshd 22776 358788 1 0 3 0x100083 ttyin getty 60555 400191 1 0 3 0x80 select sshd 46334 382388 40698 74 3 0x100092 bpf pflogd 40698 448670 1 0 3 0x80 netio pflogd 38116 449713 51855 73 3 0x100090 kqread syslogd 51855 338826 1 0 3 0x100082 netio syslogd 55300 17969 1 77 3 0x100090 poll dhclient 62357 435840 1 0 3 0x80 poll dhclient 50240 265398 0 0 3 0x14200 bored smr 3066 38938 0 0 3 0x14200 pgzero zerothread 31689 22149 0 0 3 0x14200 aiodoned aiodoned 8887 37361 0 0 3 0x14200 syncer update 17337 356413 0 0 3 0x14200 cleaner cleaner 2851 207449 0 0 3 0x14200 reaper reaper 91650 189454 0 0 3 0x14200 pgdaemon pagedaemon 39353 156974 0 0 3 0x14200 bored crynlk 88550 518703 0 0 3 0x14200 bored crypto 37234 142550 0 0 3 0x40014200 acpi0 acpi0 85507 224531 0 0 7 0x40014200 idle1 22064 280249 0 0 3 0x14200 bored softnet 14000 246304 0 0 3 0x14200 bored systqmp 18716 185721 0 0 3 0x14200 bored systq *73785 366019 0 0 7 0x40014200 softclock 11068 485685 0 0 3 0x40014200 idle0 1 132216 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 73785 (softclock) thread 0xffff800020e18c30 (366019) exclusive rwlock netlock r = 0 (0xffffffff825086d8) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 nd6_dad_timer+0x34 sys/netinet6/nd6_nbr.c:1170 #2 timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] #2 timeout_run+0xc4 sys/kern/kern_timeout.c:490 #3 softclock_thread+0x16a sys/kern/kern_timeout.c:580 #4 proc_trampoline+0x1c shared rwlock timeout r = 0 (0xffffffff824d7a88) #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 = 1 (0xffffffff82643ee0) #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 81 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 60 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 73 12K 12K 78643K 988 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 6 0K 0K 78643K 7 0 temp 29 3029K 3093K 78643K 1950 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 76 0 70 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 256 144 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 1466 0 64 88 0 88 88 0 8 0 ffsino 272 1466 0 64 94 0 94 94 0 8 0 nchpl 144 1726 0 123 60 0 60 60 0 8 0 uvmvnodes 72 1476 0 0 27 0 27 27 0 8 0 vnodes 208 1476 0 0 78 0 78 78 0 8 0 namei 1024 4378 0 4378 1 0 1 1 0 8 1 percpumem 16 31 0 0 1 0 1 1 0 8 0 scxspl 192 4101 0 4101 2 1 1 2 0 8 1 plimitpl 152 15 0 8 1 0 1 1 0 8 0 sigapl 424 283 0 254 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 496 268 0 254 3 0 3 3 0 8 0 filepl 152 1199 0 1141 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 144 254 0 253 1 0 1 1 0 8 0 processpl 984 283 0 253 5 0 5 5 0 8 1 procpl 624 291 0 253 4 0 4 4 0 8 1 sockpl 400 122 0 104 2 0 2 2 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 80 0 0 10 0 10 10 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 99 0 0 7 0 7 7 0 8 0 bufpl 280 3028 0 132 207 0 207 207 0 8 0 anonpl 16 23289 0 21638 13 1 12 12 0 124 4 amapchunkpl 152 901 0 835 4 0 4 4 0 158 0 amappl16 192 277 0 243 2 0 2 2 0 8 0 amappl15 184 47 0 44 1 0 1 1 0 8 0 amappl14 176 29 0 25 1 0 1 1 0 8 0 amappl13 168 22 0 20 1 0 1 1 0 8 0 amappl12 160 12 0 11 2 1 1 1 0 8 0 amappl11 152 99 0 82 1 0 1 1 0 8 0 amappl10 144 20 0 18 1 0 1 1 0 8 0 amappl9 136 230 0 229 1 0 1 1 0 8 0 amappl8 128 271 0 263 1 0 1 1 0 8 0 amappl7 120 116 0 105 1 0 1 1 0 8 0 amappl6 112 68 0 66 2 1 1 1 0 8 0 amappl5 104 131 0 116 1 0 1 1 0 8 0 amappl4 96 536 0 508 1 0 1 1 0 8 0 amappl3 88 105 0 100 1 0 1 1 0 8 0 amappl2 80 989 0 928 2 0 2 2 0 8 0 amappl1 72 15566 0 15144 23 5 18 18 0 8 8 amappl 80 518 0 490 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 24 268 0 254 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 268 0 254 1 0 1 1 0 8 0 vmmpekpl 168 6416 0 6391 2 0 2 2 0 8 0 vmmpepl 168 34378 0 33450 77 5 72 72 0 357 29 vmsppl 368 267 0 254 2 0 2 2 0 8 0 pdppl 4096 544 0 508 6 0 6 6 0 8 0 pvpl 32 118003 0 113984 104 0 104 104 0 265 70 pmappl 232 267 0 254 1 0 1 1 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 233 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(ffffffff821fc6cc) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff826b4128) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff826b4128) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff826b4128,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_get(2,3) at m_get+0x4c sys/kern/uipc_mbuf.c:250 sbappendaddr(fffffd806f6e1190,fffffd806f6e1218,ffffffff82408058,fffffd807f01e900,0) at sbappendaddr+0x2e9 sys/kern/uipc_socket2.c:804 rtm_sendup(fffffd806f6e1190,fffffd807f01e900,0) at rtm_sendup+0xef sys/net/rtsock.c:594 route_input(fffffd807f01e900,0,18) at route_input+0x489 sys/net/rtsock.c:572 rtm_addr(14,ffff800000a0cc00) at rtm_addr+0x10b sys/net/rtsock.c:1751 nd6_dad_timer(ffff800000a0cc00) at nd6_dad_timer+0x2f9 sys/netinet6/nd6_nbr.c:1244 timeout_run(ffff8000009da830) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffff8000009da830) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020e18c30) at softclock_thread+0x16a sys/kern/kern_timeout.c:580 end trace frame: 0x0, count: -12 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}>