panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806d744e00+16 0x0!=0x98e118676509bc54 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 141309 35127 0 0x2 0 1 syz-executor.0 * 3174 23761 0 0x14000 0x40000200 0K softclock 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 sbappendaddr(fffffd806f6dd4b0,fffffd806f6dd538,ffffffff82311bb8,fffffd806d744d00,0) at sbappendaddr+0x2e9 sys/kern/uipc_socket2.c:804 rtm_sendup(fffffd806f6dd4b0,fffffd806d744d00,0) at rtm_sendup+0xef sys/net/rtsock.c:594 route_input(fffffd806d744d00,0,18) at route_input+0x489 sys/net/rtsock.c:572 rtm_addr(14,ffff8000009db400) at rtm_addr+0x10b sys/net/rtsock.c:1751 nd6_dad_timer(ffff8000009db400) at nd6_dad_timer+0x2f9 sys/netinet6/nd6_nbr.c:1244 timeout_run(ffff800000a22730) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffff800000a22730) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020e195f0) 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 0xfffffd806d744e00+16 0x0!=0x98e118676509bc54 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 sbappendaddr(fffffd806f6dd4b0,fffffd806f6dd538,ffffffff82311bb8,fffffd806d744d00,0) at sbappendaddr+0x2e9 sys/kern/uipc_socket2.c:804 rtm_sendup(fffffd806f6dd4b0,fffffd806d744d00,0) at rtm_sendup+0xef sys/net/rtsock.c:594 route_input(fffffd806d744d00,0,18) at route_input+0x489 sys/net/rtsock.c:572 rtm_addr(14,ffff8000009db400) at rtm_addr+0x10b sys/net/rtsock.c:1751 nd6_dad_timer(ffff8000009db400) at nd6_dad_timer+0x2f9 sys/netinet6/nd6_nbr.c:1244 timeout_run(ffff800000a22730) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffff800000a22730) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020e195f0) 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 0xffff800020e27320 rbx 0xffff800020e273d0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff813f10ef kprintf+0x16f r9 0x1 r10 0x4d24dab8b03d140a r11 0xea2761166a88b1af r12 0x3000000008 r13 0xffff800020e27330 r14 0x100 r15 0x1 rip 0xffffffff81d6d978 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020e27310 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (softclock) pid=3174 stat=onproc flags process=14000 proc=40000200 pri=0, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020e19ad0,0xffff800020e19120 process=0xffff800020e1b338 user=0xffff800020e22000, vmspace=0xffffffff8266ba60 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 35127 141309 5062 0 7 0x2 syz-executor.0 5062 69981 81674 0 3 0x82 thrsleep syz-execprog 5062 128153 81674 0 3 0x4000082 nanosleep syz-execprog 5062 394295 81674 0 3 0x4000082 thrsleep syz-execprog 5062 54285 81674 0 3 0x4000082 thrsleep syz-execprog 5062 473421 81674 0 3 0x4000082 thrsleep syz-execprog 5062 284083 81674 0 3 0x4000082 thrsleep syz-execprog 5062 340483 81674 0 3 0x4000082 kqread syz-execprog 5062 196055 81674 0 3 0x4000082 thrsleep syz-execprog 5062 208900 81674 0 2 0x4000482 syz-execprog 81674 249446 4849 0 3 0x10008a pause ksh 4849 459741 66765 0 3 0x92 select sshd 28620 85844 1 0 3 0x100083 ttyin getty 66765 121548 1 0 3 0x80 select sshd 52749 269976 23610 74 3 0x100092 bpf pflogd 23610 231832 1 0 3 0x80 netio pflogd 39340 164774 330 73 3 0x100090 kqread syslogd 330 379272 1 0 3 0x100082 netio syslogd 47443 520818 1 77 3 0x100090 poll dhclient 71758 278414 1 0 3 0x80 poll dhclient 97183 79931 0 0 3 0x14200 bored smr 825 258345 0 0 3 0x14200 pgzero zerothread 18453 513225 0 0 3 0x14200 aiodoned aiodoned 20872 121978 0 0 3 0x14200 syncer update 65198 194534 0 0 3 0x14200 cleaner cleaner 57683 201109 0 0 3 0x14200 reaper reaper 21869 352810 0 0 3 0x14200 pgdaemon pagedaemon 44207 91527 0 0 3 0x14200 bored crynlk 33993 122210 0 0 3 0x14200 bored crypto 28871 42820 0 0 3 0x40014200 acpi0 acpi0 36346 146466 0 0 3 0x40014200 idle1 28009 61096 0 0 3 0x14200 bored softnet 23274 5691 0 0 3 0x14200 bored systqmp 99278 236378 0 0 3 0x14200 bored systq *23761 3174 0 0 7 0x40014200 softclock 76249 146595 0 0 3 0x40014200 idle0 1 385989 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 23761 (softclock) thread 0xffff800020e195f0 (3174) 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 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 (0xffffffff825163f0) #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 (0xffffffff82655658) #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 9466 6395K 6395K 78643K 10557 0 pcb 13 8K 8K 78643K 13 0 rtable 83 2K 2K 78643K 163 0 ifaddr 37 9K 9K 78643K 80 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 2 4K 12K 78643K 59 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 985 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 3033K 3097K 78643K 1948 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 75 0 69 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 256 144 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 1465 0 63 88 0 88 88 0 8 0 ffsino 272 1465 0 63 94 0 94 94 0 8 0 nchpl 144 1722 0 121 60 0 60 60 0 8 0 uvmvnodes 72 1475 0 0 27 0 27 27 0 8 0 vnodes 208 1475 0 0 78 0 78 78 0 8 0 namei 1024 4368 0 4368 2 1 1 1 0 8 1 percpumem 16 31 0 0 1 0 1 1 0 8 0 scxspl 192 4220 0 4220 8 1 7 7 0 8 7 plimitpl 152 15 0 8 1 0 1 1 0 8 0 sigapl 424 282 0 253 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 496 267 0 253 3 0 3 3 0 8 0 filepl 152 1191 0 1133 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 144 253 0 252 2 1 1 1 0 8 0 processpl 984 282 0 252 5 0 5 5 0 8 1 procpl 624 290 0 252 4 0 4 4 0 8 1 sockpl 400 121 0 103 2 0 2 2 0 8 0 mcl4k 4096 3 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 256 104 0 0 6 0 6 6 0 8 0 bufpl 280 3020 0 133 207 0 207 207 0 8 0 anonpl 16 23429 0 21489 14 2 12 12 0 124 4 amapchunkpl 152 882 0 817 4 0 4 4 0 158 0 amappl16 192 326 0 275 3 0 3 3 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 37 0 31 1 0 1 1 0 8 0 amappl13 168 20 0 19 2 1 1 1 0 8 0 amappl12 160 18 0 12 1 0 1 1 0 8 0 amappl11 152 95 0 78 1 0 1 1 0 8 0 amappl10 144 14 0 12 1 0 1 1 0 8 0 amappl9 136 233 0 231 1 0 1 1 0 8 0 amappl8 128 275 0 266 1 0 1 1 0 8 0 amappl7 120 113 0 102 1 0 1 1 0 8 0 amappl6 112 65 0 63 2 1 1 1 0 8 0 amappl5 104 170 0 156 1 0 1 1 0 8 0 amappl4 96 495 0 472 1 0 1 1 0 8 0 amappl3 88 106 0 100 1 0 1 1 0 8 0 amappl2 80 999 0 940 3 1 2 2 0 8 0 amappl1 72 15473 0 15058 23 5 18 18 0 8 8 amappl 80 515 0 487 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 24 267 0 253 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 267 0 253 1 0 1 1 0 8 0 vmmpekpl 168 6430 0 6408 2 0 2 2 0 8 0 vmmpepl 168 34274 0 33333 83 11 72 72 0 357 30 vmsppl 368 266 0 253 2 0 2 2 0 8 0 pdppl 4096 542 0 506 6 0 6 6 0 8 0 pvpl 32 118034 0 113720 109 5 104 104 0 265 69 pmappl 232 266 0 253 1 0 1 1 0 8 0 extentpl 40 46 0 29 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(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 sbappendaddr(fffffd806f6dd4b0,fffffd806f6dd538,ffffffff82311bb8,fffffd806d744d00,0) at sbappendaddr+0x2e9 sys/kern/uipc_socket2.c:804 rtm_sendup(fffffd806f6dd4b0,fffffd806d744d00,0) at rtm_sendup+0xef sys/net/rtsock.c:594 route_input(fffffd806d744d00,0,18) at route_input+0x489 sys/net/rtsock.c:572 rtm_addr(14,ffff8000009db400) at rtm_addr+0x10b sys/net/rtsock.c:1751 nd6_dad_timer(ffff8000009db400) at nd6_dad_timer+0x2f9 sys/netinet6/nd6_nbr.c:1244 timeout_run(ffff800000a22730) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffff800000a22730) at timeout_run+0xc4 sys/kern/kern_timeout.c:490 softclock_thread(ffff800020e195f0) 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 __mp_lock(ffffffff82655450) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82655450) at __mp_lock+0x127 sys/kern/kern_lock.c:147 syscall(ffff800020f65230) at syscall+0x400 mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff800020f65230) at syscall+0x400 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbd8c0, count: 9 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 __mp_lock(ffffffff82655450) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82655450) at __mp_lock+0x127 sys/kern/kern_lock.c:147 syscall(ffff800020f65230) at syscall+0x400 mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff800020f65230) at syscall+0x400 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbd8c0, count: -6 ddb{1}>