panic: acquiring blockable sleep lock with spinlock or critical section held (kernel_lock) &kernel_lock Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 245331 60290 0 0x14000 0x200 0 softnet *374826 82312 0 0x14000 0x200 1 systqmp db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82417a1f) at panic+0x15c sys/kern/subr_prf.c:207 witness_checkorder(ffffffff828bb818,9,0) at witness_checkorder+0x10e0 sys/kern/subr_witness.c:821 __mp_lock(ffffffff828bb610) at __mp_lock+0xa1 read_rflags machine/cpufunc.h:195 [inline] __mp_lock(ffffffff828bb610) at __mp_lock+0xa1 intr_disable machine/cpufunc.h:216 [inline] __mp_lock(ffffffff828bb610) at __mp_lock+0xa1 sys/kern/kern_lock.c:142 pageflttrap(ffff800020da3d20,0) at pageflttrap+0x7f sys/arch/amd64/amd64/trap.c:180 kerntrap(ffff800020da3d20) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:302 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b pool_cache_gc(ffffffff828e4550) at pool_cache_gc+0x138 pool_cache_list_put sys/kern/subr_pool.c:1970 [inline] pool_cache_gc(ffffffff828e4550) at pool_cache_gc+0x138 sys/kern/subr_pool.c:2025 pool_gc_pages(0) at pool_gc_pages+0x6c sys/kern/subr_pool.c:1559 taskq_thread(ffffffff827a9b70) at taskq_thread+0xec sys/kern/kern_task.c:437 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic acquiring blockable sleep lock with spinlock or critical section held (kernel_lock) &kernel_lock ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82417a1f) at panic+0x15c sys/kern/subr_prf.c:207 witness_checkorder(ffffffff828bb818,9,0) at witness_checkorder+0x10e0 sys/kern/subr_witness.c:821 __mp_lock(ffffffff828bb610) at __mp_lock+0xa1 read_rflags machine/cpufunc.h:195 [inline] __mp_lock(ffffffff828bb610) at __mp_lock+0xa1 intr_disable machine/cpufunc.h:216 [inline] __mp_lock(ffffffff828bb610) at __mp_lock+0xa1 sys/kern/kern_lock.c:142 pageflttrap(ffff800020da3d20,0) at pageflttrap+0x7f sys/arch/amd64/amd64/trap.c:180 kerntrap(ffff800020da3d20) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:302 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b pool_cache_gc(ffffffff828e4550) at pool_cache_gc+0x138 pool_cache_list_put sys/kern/subr_pool.c:1970 [inline] pool_cache_gc(ffffffff828e4550) at pool_cache_gc+0x138 sys/kern/subr_pool.c:2025 pool_gc_pages(0) at pool_gc_pages+0x6c sys/kern/subr_pool.c:1559 taskq_thread(ffffffff827a9b70) at taskq_thread+0xec sys/kern/kern_task.c:437 end trace frame: 0x0, count: -10 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020da3a90 rbx 0xffff800020da3b40 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff8105721f kprintf+0x16f r9 0x1 r10 0x2 r11 0xfd3d500c043e8358 r12 0x3000000008 r13 0xffff800020da3aa0 r14 0x100 r15 0x1 rip 0xffffffff815da538 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020da3a80 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (systqmp) pid=374826 stat=onproc flags process=14000 proc=200 pri=32, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020d895f0,0xffff800020d88eb0 process=0xffff800020d8a3e0 user=0xffff800020d9e000, vmspace=0xffffffff8291e220 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 24140 108766 0 0 3 0x14200 acct acct 33607 8188 0 0 3 0x14280 nfsidl nfsio 95514 147954 0 0 3 0x14280 nfsidl nfsio 67705 221452 0 0 3 0x14280 nfsidl nfsio 60422 58343 0 0 3 0x14280 nfsidl nfsio 33884 296013 0 0 3 0x14280 nfsidl nfsio 40577 63236 0 0 3 0x14280 nfsidl nfsio 69796 68686 0 0 3 0x14280 nfsidl nfsio 16154 458748 0 0 3 0x14280 nfsidl nfsio 68729 362196 0 0 3 0x14280 nfsidl nfsio 31636 78268 0 0 3 0x14280 nfsidl nfsio 41196 254351 0 0 3 0x14280 nfsidl nfsio 63138 178091 0 0 3 0x14280 nfsidl nfsio 65818 201596 0 0 3 0x14280 nfsidl nfsio 21941 341063 0 0 3 0x14280 nfsidl nfsio 16368 88328 0 0 3 0x14280 nfsidl nfsio 62812 214041 0 0 3 0x14280 nfsidl nfsio 87237 493361 0 0 3 0x14280 nfsidl nfsio 98241 385423 0 0 3 0x14280 nfsidl nfsio 16261 442930 0 0 3 0x14280 nfsidl nfsio 28087 410503 0 0 3 0x14280 nfsidl nfsio 69073 495733 0 0 3 0x14200 bored sosplice 52418 287837 1 0 3 0x100083 ttyin getty 18285 480319 9470 0 3 0x82 piperd syz-executor.1 9470 168320 34114 0 3 0x82 thrsleep syz-fuzzer 9470 402680 34114 0 3 0x4000082 thrsleep syz-fuzzer 9470 330345 34114 0 3 0x4000082 thrsleep syz-fuzzer 9470 276262 34114 0 3 0x4000082 thrsleep syz-fuzzer 9470 325732 34114 0 3 0x4000082 thrsleep syz-fuzzer 9470 58017 34114 0 3 0x4000082 kqread syz-fuzzer 9470 83518 34114 0 3 0x4000082 thrsleep syz-fuzzer 9470 257538 34114 0 3 0x4000082 thrsleep syz-fuzzer 9470 495377 34114 0 3 0x4000082 thrsleep syz-fuzzer 9470 187380 34114 0 3 0x4000082 thrsleep syz-fuzzer 34114 452010 4898 0 3 0x10008a pause ksh 4898 355394 30132 0 3 0x92 select sshd 30132 340357 1 0 3 0x80 select sshd 99746 141708 92023 74 3 0x100092 bpf pflogd 92023 309417 1 0 3 0x80 netio pflogd 55345 408581 75801 73 3 0x100090 kqread syslogd 75801 479702 1 0 3 0x100082 netio syslogd 98674 255726 1 77 3 0x100090 poll dhclient 66672 227331 1 0 3 0x80 poll dhclient 86137 36048 0 0 3 0x14200 bored smr 19158 274189 0 0 3 0x14200 pgzero zerothread 9882 328264 0 0 3 0x14200 aiodoned aiodoned 83206 446394 0 0 3 0x14200 syncer update 80142 297148 0 0 3 0x14200 cleaner cleaner 70489 252691 0 0 3 0x14200 reaper reaper 93497 508283 0 0 3 0x14200 pgdaemon pagedaemon 75599 93800 0 0 3 0x14200 bored crynlk 10153 131361 0 0 3 0x14200 bored crypto 86980 56828 0 0 3 0x40014200 acpi0 acpi0 92454 19193 0 0 3 0x40014200 idle1 60290 245331 0 0 7 0x14200 softnet *82312 374826 0 0 7 0x14200 systqmp 90512 208033 0 0 3 0x14200 bored systq 83558 120308 0 0 3 0x40014200 bored softclock 89802 415963 0 0 3 0x40014200 idle0 1 280976 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex softnet r = 0 (0xffff80000002c028) #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 taskq_next_work+0x33 sys/kern/kern_task.c:394 #4 taskq_thread+0x135 sys/kern/kern_task.c:434 #5 proc_trampoline+0x1c CPU 1: exclusive mutex mbufpl r = 0 (0xffffffff828e4560) #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_cache_gc+0x12d pl_enter sys/kern/subr_pool.c:104 [inline] #3 pool_cache_gc+0x12d pool_cache_list_put sys/kern/subr_pool.c:1968 [inline] #3 pool_cache_gc+0x12d sys/kern/subr_pool.c:2025 #4 pool_gc_pages+0x6c sys/kern/subr_pool.c:1559 #5 taskq_thread+0xec sys/kern/kern_task.c:437 #6 proc_trampoline+0x1c Process 82312 (systqmp) thread 0xffff800020d89380 (374826) shared rwlock pools r = 0 (0xffffffff8274d7c0) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 pool_gc_pages+0x21 sys/kern/subr_pool.c:1555 #2 taskq_thread+0xec sys/kern/kern_task.c:437 #3 proc_trampoline+0x1c shared rwlock systqmp r = 0 (0xffffffff827a9be0) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 taskq_thread+0xdf sys/kern/kern_task.c:436 #2 proc_trampoline+0x1c exclusive mutex mbufpl r = 0 (0xffffffff828e4560) #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_cache_gc+0x12d pl_enter sys/kern/subr_pool.c:104 [inline] #3 pool_cache_gc+0x12d pool_cache_list_put sys/kern/subr_pool.c:1968 [inline] #3 pool_cache_gc+0x12d sys/kern/subr_pool.c:2025 #4 pool_gc_pages+0x6c sys/kern/subr_pool.c:1559 #5 taskq_thread+0xec sys/kern/kern_task.c:437 #6 proc_trampoline+0x1c ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9516 6416K 6666K 78643K 10940 0 pcb 13 8K 8K 78643K 44 0 rtable 113 5K 8K 78643K 371 0 ifaddr 76 15K 15K 78643K 112 0 counters 45 34K 34K 78643K 53 0 ioctlops 0 0K 4K 78643K 1499 0 iov 0 0K 24K 78643K 41 0 mount 1 1K 1K 78643K 1 0 vnodes 1232 77K 77K 78643K 1486 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 7 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 44 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 4 9K 25K 78643K 321 0 sigio 0 0K 0K 78643K 2 0 proc 61 63K 83K 78643K 550 0 subproc 31 1K 3K 78643K 187 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 73 0 in_multi 48 2K 2K 78643K 92 0 ether_multi 1 0K 0K 78643K 6 0 mrt 0 0K 0K 78643K 2 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 49 228K 228K 78643K 49 0 exec 0 0K 1K 78643K 242 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 121 55K 63K 78643K 1959 0 UVM aobj 21 2K 2K 78643K 23 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 54 0 NDP 12 0K 0K 78643K 25 0 temp 109 3862K 3926K 78643K 15421 0 kqueue 3 4K 8K 78643K 13 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 11 0 4 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 31 0 29 1 0 1 1 0 8 0 rtentry 112 70 0 27 2 0 2 2 0 8 0 unpcb 120 121 0 111 1 0 1 1 0 8 0 syncache 264 6 0 6 2 2 0 1 0 8 0 tcpcb 544 233 0 229 1 0 1 1 0 8 0 inpcb 296 509 0 502 3 2 1 2 0 8 0 rttmr 72 1 0 1 1 1 0 1 0 8 0 nd6 48 14 0 9 1 0 1 1 0 8 0 ppxss 1128 2 0 2 1 1 0 1 0 8 0 pffrag 232 2 0 2 2 2 0 1 0 482 0 pffrnode 88 2 0 2 2 2 0 1 0 8 0 pffrent 40 90 0 90 2 2 0 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 pfrktable 1344 23 0 21 2 1 1 1 0 8 0 pfstitem 24 30 0 21 1 0 1 1 0 8 0 pfstkey 112 30 0 21 1 0 1 1 0 8 0 pfstate 328 30 0 21 3 0 3 3 0 8 0 pfrule 1360 27 0 18 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 277 0 87 15 3 12 13 0 8 0 art_table 32 278 0 87 2 0 2 2 0 8 0 art_node 16 69 0 29 1 0 1 1 0 8 0 sysvmsgpl 40 28 0 21 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 36 0 26 1 0 1 1 0 8 0 shmpl 112 20 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1774 0 372 89 0 89 89 0 8 0 ffsino 272 1774 0 372 95 0 95 95 0 8 0 nchpl 144 2453 0 865 60 0 60 60 0 8 0 uvmvnodes 72 2050 0 0 38 0 38 38 0 8 0 vnodes 208 2050 0 0 108 0 108 108 0 8 0 namei 1024 7013 0 7013 3 2 1 1 0 8 1 percpumem 16 37 0 4 1 0 1 1 0 8 0 vcpupl 1984 4 0 0 1 0 1 1 0 8 0 vmpool 560 4 0 0 1 0 1 1 0 8 0 pfiaddrpl 120 8 0 6 2 1 1 1 0 8 0 scxspl 192 6997 0 6997 12 11 1 7 0 8 1 plimitpl 152 41 0 33 1 0 1 1 0 8 0 sigapl 424 532 0 480 8 1 7 7 0 8 1 futexpl 56 3665 0 3665 3 3 0 1 0 8 0 knotepl 112 181 0 168 1 0 1 1 0 8 0 kqueuepl 144 36 0 34 1 0 1 1 0 8 0 pipepl 304 170 0 163 3 2 1 2 0 8 0 fdescpl 496 495 0 480 3 0 3 3 0 8 0 filepl 152 3097 0 3003 6 1 5 6 0 8 0 lockfpl 104 54 0 53 1 0 1 1 0 8 0 lockfspl 48 23 0 22 1 0 1 1 0 8 0 sessionpl 112 28 0 17 1 0 1 1 0 8 0 pgrppl 48 30 0 19 1 0 1 1 0 8 0 ucredpl 96 274 0 265 1 0 1 1 0 8 0 zombiepl 144 481 0 480 1 0 1 1 0 8 0 processpl 992 532 0 480 7 0 7 7 0 8 0 procpl 624 1123 0 1062 8 3 5 6 0 8 0 sosppl 128 5 0 5 2 2 0 1 0 8 0 sockpl 400 661 0 642 7 4 3 4 0 8 1 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 5 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 9 0 0 2 0 2 2 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 191 0 0 23 0 23 23 0 8 0 mtagpl 96 22 0 0 1 0 1 1 0 8 0 mbufpl 256 331 0 0 20 0 20 20 0 8 0 bufpl 280 3917 0 137 270 0 270 270 0 8 0 anonpl 16 56833 0 44546 71 3 68 70 0 124 0 amapchunkpl 152 3168 0 3025 21 14 7 20 0 158 0 amappl16 192 1876 0 970 47 1 46 47 0 8 0 amappl15 184 130 0 128 1 0 1 1 0 8 0 amappl14 176 137 0 130 1 0 1 1 0 8 0 amappl13 168 49 0 46 1 0 1 1 0 8 0 amappl12 160 21 0 19 2 1 1 1 0 8 0 amappl11 152 165 0 148 1 0 1 1 0 8 0 amappl10 144 153 0 147 1 0 1 1 0 8 0 amappl9 136 392 0 391 1 0 1 1 0 8 0 amappl8 128 395 0 365 3 1 2 2 0 8 0 amappl7 120 135 0 120 1 0 1 1 0 8 0 amappl6 112 26 0 21 1 0 1 1 0 8 0 amappl5 104 279 0 262 1 0 1 1 0 8 0 amappl4 96 628 0 594 1 0 1 1 0 8 0 amappl3 88 217 0 210 1 0 1 1 0 8 0 amappl2 80 2996 0 2928 2 0 2 2 0 8 0 amappl1 72 20997 0 20548 23 13 10 18 0 8 0 amappl 80 1392 0 1348 2 0 2 2 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 22 0 2 1 0 1 1 0 8 0 uaddrrnd 24 499 0 480 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 499 0 480 1 0 1 1 0 8 0 vmmpekpl 168 8499 0 8461 2 0 2 2 0 8 0 vmmpepl 168 75489 0 73468 161 29 132 132 0 357 37 vmsppl 368 498 0 480 2 0 2 2 0 8 0 pdppl 4096 1005 0 964 6 0 6 6 0 8 0 pvpl 32 195275 0 179804 171 8 163 171 0 265 0 pmappl 232 498 0 480 2 0 2 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 282 0 15 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff826ebff0) 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_release_all(ffffffff828bb610) at __mp_release_all+0xbe sys/kern/kern_lock.c:197 msleep(ffff80000002c000,ffff80000002c018,20,ffffffff8242d489,0) at msleep+0x19b sys/kern/kern_synch.c:233 taskq_next_work(ffff80000002c000,ffff800020da9168) at taskq_next_work+0x8d sys/kern/kern_task.c:394 taskq_thread(ffff80000002c000) at taskq_thread+0x135 sys/kern/kern_task.c:434 end trace frame: 0x0, count: 8 ddb{0}> trace x86_ipi_db(ffffffff826ebff0) 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_release_all(ffffffff828bb610) at __mp_release_all+0xbe sys/kern/kern_lock.c:197 msleep(ffff80000002c000,ffff80000002c018,20,ffffffff8242d489,0) at msleep+0x19b sys/kern/kern_synch.c:233 taskq_next_work(ffff80000002c000,ffff800020da9168) at taskq_next_work+0x8d sys/kern/kern_task.c:394 taskq_thread(ffff80000002c000) at taskq_thread+0x135 sys/kern/kern_task.c:434 end trace frame: 0x0, count: -7 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x18: addq $0x8,%rsp db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82417a1f) at panic+0x15c sys/kern/subr_prf.c:207 witness_checkorder(ffffffff828bb818,9,0) at witness_checkorder+0x10e0 sys/kern/subr_witness.c:821 __mp_lock(ffffffff828bb610) at __mp_lock+0xa1 read_rflags machine/cpufunc.h:195 [inline] __mp_lock(ffffffff828bb610) at __mp_lock+0xa1 intr_disable machine/cpufunc.h:216 [inline] __mp_lock(ffffffff828bb610) at __mp_lock+0xa1 sys/kern/kern_lock.c:142 pageflttrap(ffff800020da3d20,0) at pageflttrap+0x7f sys/arch/amd64/amd64/trap.c:180 kerntrap(ffff800020da3d20) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:302 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b pool_cache_gc(ffffffff828e4550) at pool_cache_gc+0x138 pool_cache_list_put sys/kern/subr_pool.c:1970 [inline] pool_cache_gc(ffffffff828e4550) at pool_cache_gc+0x138 sys/kern/subr_pool.c:2025 pool_gc_pages(0) at pool_gc_pages+0x6c sys/kern/subr_pool.c:1559 taskq_thread(ffffffff827a9b70) at taskq_thread+0xec sys/kern/kern_task.c:437 end trace frame: 0x0, count: 5 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82417a1f) at panic+0x15c sys/kern/subr_prf.c:207 witness_checkorder(ffffffff828bb818,9,0) at witness_checkorder+0x10e0 sys/kern/subr_witness.c:821 __mp_lock(ffffffff828bb610) at __mp_lock+0xa1 read_rflags machine/cpufunc.h:195 [inline] __mp_lock(ffffffff828bb610) at __mp_lock+0xa1 intr_disable machine/cpufunc.h:216 [inline] __mp_lock(ffffffff828bb610) at __mp_lock+0xa1 sys/kern/kern_lock.c:142 pageflttrap(ffff800020da3d20,0) at pageflttrap+0x7f sys/arch/amd64/amd64/trap.c:180 kerntrap(ffff800020da3d20) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:302 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b pool_cache_gc(ffffffff828e4550) at pool_cache_gc+0x138 pool_cache_list_put sys/kern/subr_pool.c:1970 [inline] pool_cache_gc(ffffffff828e4550) at pool_cache_gc+0x138 sys/kern/subr_pool.c:2025 pool_gc_pages(0) at pool_gc_pages+0x6c sys/kern/subr_pool.c:1559 taskq_thread(ffffffff827a9b70) at taskq_thread+0xec sys/kern/kern_task.c:437 end trace frame: 0x0, count: -10