panic: pool_do_get: mbufpl free list modified: page 0xfffffd806f35f000; item addr 0xfffffd806f35f800; offset 0x0=0x0 != 0x73fbefc8eaed3ca8 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 37704 75377 0 0x14000 0x40000200 0K softclock db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff822728e7) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff82645f90,2,ffff800020e26c78) at pool_do_get+0x439 sys/kern/subr_pool.c:738 pool_get(ffffffff82645f90,2) at pool_get+0xeb sys/kern/subr_pool.c:581 m_copyback(fffffd806f35f700,80,20,ffff8000009d4d60,2) at m_copyback+0x4d7 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copyback(fffffd806f35f700,80,20,ffff8000009d4d60,2) at m_copyback+0x4d7 sys/kern/uipc_mbuf.c:790 rtm_msg1(14,ffff800020e26e18) at rtm_msg1+0x1b2 sys/net/rtsock.c:1552 rtm_addr(14,ffff800000a0ca00) at rtm_addr+0x9b sys/net/rtsock.c:1740 nd6_dad_timer(ffff800000a0ca00) at nd6_dad_timer+0x2f9 sys/netinet6/nd6_nbr.c:1244 timeout_run(ffff8000009da6b0) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffff8000009da6b0) 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: 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_do_get: mbufpl free list modified: page 0xfffffd806f35f000; item addr 0xfffffd806f35f800; offset 0x0=0x0 != 0x73fbefc8eaed3ca8 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff822728e7) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff82645f90,2,ffff800020e26c78) at pool_do_get+0x439 sys/kern/subr_pool.c:738 pool_get(ffffffff82645f90,2) at pool_get+0xeb sys/kern/subr_pool.c:581 m_copyback(fffffd806f35f700,80,20,ffff8000009d4d60,2) at m_copyback+0x4d7 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copyback(fffffd806f35f700,80,20,ffff8000009d4d60,2) at m_copyback+0x4d7 sys/kern/uipc_mbuf.c:790 rtm_msg1(14,ffff800020e26e18) at rtm_msg1+0x1b2 sys/net/rtsock.c:1552 rtm_addr(14,ffff800000a0ca00) at rtm_addr+0x9b sys/net/rtsock.c:1740 nd6_dad_timer(ffff800000a0ca00) at nd6_dad_timer+0x2f9 sys/netinet6/nd6_nbr.c:1244 timeout_run(ffff8000009da6b0) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffff8000009da6b0) 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: -10 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020e26ac0 rbx 0xffff800020e26b70 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff815c718f kprintf+0x16f r9 0x1 r10 0x2 r11 0xf7cdd5ef0d2da1af r12 0x3000000008 r13 0xffff800020e26ad0 r14 0x100 r15 0x1 rip 0xffffffff820cd538 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020e26ab0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (softclock) pid=37704 stat=onproc flags process=14000 proc=40000200 pri=0, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020e19860,0xffff800020e18eb0 process=0xffff800020e1af60 user=0xffff800020e22000, vmspace=0xffffffff82680068 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 48583 23186 54134 0 3 0x82 nanosleep syz-executor.0 54134 466157 7587 0 3 0x82 thrsleep syz-execprog 54134 131069 7587 0 3 0x4000082 nanosleep syz-execprog 54134 59227 7587 0 3 0x4000082 thrsleep syz-execprog 54134 220157 7587 0 3 0x4000082 nanosleep syz-execprog 54134 433572 7587 0 3 0x4000082 thrsleep syz-execprog 54134 423388 7587 0 3 0x4000082 thrsleep syz-execprog 54134 336576 7587 0 3 0x4000082 thrsleep syz-execprog 54134 67782 7587 0 3 0x4000082 thrsleep syz-execprog 54134 70294 7587 0 3 0x4000082 kqread syz-execprog 7587 20420 27685 0 3 0x10008a pause ksh 27685 294635 79068 0 3 0x92 select sshd 59160 457156 1 0 3 0x100083 ttyin getty 79068 52462 1 0 3 0x80 select sshd 16149 288734 77323 74 3 0x100092 bpf pflogd 77323 296963 1 0 3 0x80 netio pflogd 75041 249800 59670 73 3 0x100090 kqread syslogd 59670 252879 1 0 3 0x100082 netio syslogd 76564 328689 1 77 3 0x100090 poll dhclient 22785 287843 1 0 3 0x80 poll dhclient 61187 310027 0 0 3 0x14200 bored smr 38971 20702 0 0 3 0x14200 pgzero zerothread 29309 433714 0 0 3 0x14200 aiodoned aiodoned 90984 33523 0 0 3 0x14200 syncer update 8260 309766 0 0 3 0x14200 cleaner cleaner 43469 486476 0 0 3 0x14200 reaper reaper 93267 155738 0 0 3 0x14200 pgdaemon pagedaemon 38859 520905 0 0 3 0x14200 bored crynlk 77575 180141 0 0 3 0x14200 bored crypto 68260 109428 0 0 3 0x40014200 acpi0 acpi0 37039 503426 0 0 7 0x40014200 idle1 96108 359427 0 0 3 0x14200 bored softnet 17893 345393 0 0 3 0x14200 bored systqmp 2185 453663 0 0 3 0x14200 bored systq *75377 37704 0 0 7 0x40014200 softclock 79125 405867 0 0 3 0x40014200 idle0 1 31310 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 (0xffffffff82645fa0) #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_copyback+0x4d7 m_get sys/kern/uipc_mbuf.c:250 [inline] #4 m_copyback+0x4d7 sys/kern/uipc_mbuf.c:790 #5 rtm_msg1+0x1b2 sys/net/rtsock.c:1552 #6 rtm_addr+0x9b sys/net/rtsock.c:1740 #7 nd6_dad_timer+0x2f9 sys/netinet6/nd6_nbr.c:1244 #8 timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] #8 timeout_run+0xc4 sys/kern/kern_timeout.c:490 #9 softclock_thread+0x16a sys/kern/kern_timeout.c:580 #10 proc_trampoline+0x1c Process 75377 (softclock) thread 0xffff800020e195f0 (37704) exclusive rwlock netlock r = 0 (0xffffffff82537c48) #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 (0xffffffff82502568) #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 (0xffffffff82669b70) #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 (0xffffffff82645fa0) #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_copyback+0x4d7 m_get sys/kern/uipc_mbuf.c:250 [inline] #4 m_copyback+0x4d7 sys/kern/uipc_mbuf.c:790 #5 rtm_msg1+0x1b2 sys/net/rtsock.c:1552 #6 rtm_addr+0x9b sys/net/rtsock.c:1740 #7 nd6_dad_timer+0x2f9 sys/netinet6/nd6_nbr.c:1244 #8 timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] #8 timeout_run+0xc4 sys/kern/kern_timeout.c:490 #9 softclock_thread+0x16a sys/kern/kern_timeout.c:580 #10 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 74 12K 12K 78643K 989 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 3029K 3093K 78643K 1951 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 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 2 1 0 1 1 0 8 0 pfstkey 112 10 0 2 1 0 1 1 0 8 0 pfstate 328 10 0 2 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 2 1 1 1 0 8 1 percpumem 16 31 0 0 1 0 1 1 0 8 0 scxspl 192 4256 0 4256 9 4 5 7 0 8 5 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 2 1 1 1 0 8 0 pipepl 120 154 0 141 2 1 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 2 1 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 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 70 0 0 9 0 9 9 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 109 0 0 6 0 6 6 0 8 0 mbufpl: pool(0xffffffff82645f90:mbufpl): free list modified: page 0xfffffd806f283000; item ordinal 0; addr 0xfffffd806f283700 (p 0xfffffd806f2ee000); offset 0x0=0x0 pool(mbufpl): free list modified: page 0xfffffd806f283000; item ordinal 0; addr 0xfffffd806f283700 (p 0xfffffd806f2ee000); offset 0x0=0x0 mbufpl: pool(0xffffffff82645f90:mbufpl): page inconsistency: page 0xfffffd806f283000; item ordinal 1; addr 0x6c96209fe9c93c84 mbufpl: pool(0xffffffff82645f90:mbufpl): free list modified: page 0xfffffd806f35f000; item ordinal 0; addr 0xfffffd806f35f800 (p 0xfffffd806f2ee000); offset 0x0=0x0 pool(mbufpl): free list modified: page 0xfffffd806f35f000; item ordinal 0; addr 0xfffffd806f35f800 (p 0xfffffd806f2ee000); offset 0x0=0x0 mbufpl: pool(0xffffffff82645f90:mbufpl): page inconsistency: page 0xfffffd806f35f000; item ordinal 1; addr 0x2612a41f2b2f480c bufpl 280 3030 0 133 207 0 207 207 0 8 0 anonpl 16 23277 0 21616 14 2 12 12 0 124 3 amapchunkpl 152 792 0 726 4 0 4 4 0 158 1 amappl16 192 314 0 282 2 0 2 2 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 33 0 28 1 0 1 1 0 8 0 amappl13 168 22 0 20 2 1 1 1 0 8 0 amappl12 160 4 0 3 2 1 1 1 0 8 0 amappl11 152 50 0 34 1 0 1 1 0 8 0 amappl10 144 66 0 61 1 0 1 1 0 8 0 amappl9 136 231 0 230 1 0 1 1 0 8 0 amappl8 128 269 0 261 1 0 1 1 0 8 0 amappl7 120 116 0 103 1 0 1 1 0 8 0 amappl6 112 22 0 19 3 2 1 1 0 8 0 amappl5 104 178 0 163 1 0 1 1 0 8 0 amappl4 96 494 0 466 1 0 1 1 0 8 0 amappl3 88 106 0 100 1 0 1 1 0 8 0 amappl2 80 993 0 937 3 1 2 2 0 8 0 amappl1 72 15630 0 15204 24 6 18 18 0 8 8 amappl 80 517 0 489 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 6447 0 6423 2 0 2 2 0 8 0 vmmpepl 168 34222 0 33295 89 17 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 118094 0 114068 109 5 104 104 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 112 232 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(ffffffff822728e7) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff82645f90,2,ffff800020e26c78) at pool_do_get+0x439 sys/kern/subr_pool.c:738 pool_get(ffffffff82645f90,2) at pool_get+0xeb sys/kern/subr_pool.c:581 m_copyback(fffffd806f35f700,80,20,ffff8000009d4d60,2) at m_copyback+0x4d7 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copyback(fffffd806f35f700,80,20,ffff8000009d4d60,2) at m_copyback+0x4d7 sys/kern/uipc_mbuf.c:790 rtm_msg1(14,ffff800020e26e18) at rtm_msg1+0x1b2 sys/net/rtsock.c:1552 rtm_addr(14,ffff800000a0ca00) at rtm_addr+0x9b sys/net/rtsock.c:1740 nd6_dad_timer(ffff800000a0ca00) at nd6_dad_timer+0x2f9 sys/netinet6/nd6_nbr.c:1244 timeout_run(ffff8000009da6b0) at timeout_run+0xc4 timeout_sync_leave sys/kern/kern_timeout.c:184 [inline] timeout_run(ffff8000009da6b0) 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: -10 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}>