"ƒ_Zzpanic: 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 302746 91440 0 0x14000 0x200 0K update *235512 16138 0 0x14000 0x200 1 systqmp db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823fa309) at panic+0x15c sys/kern/subr_prf.c:207 witness_checkorder(ffffffff828b3f90,9,0) at witness_checkorder+0x10e0 sys/kern/subr_witness.c:821 __mp_lock(ffffffff828b3d88) at __mp_lock+0xa1 read_rflags machine/cpufunc.h:195 [inline] __mp_lock(ffffffff828b3d88) at __mp_lock+0xa1 intr_disable machine/cpufunc.h:216 [inline] __mp_lock(ffffffff828b3d88) at __mp_lock+0xa1 sys/kern/kern_lock.c:142 pageflttrap(ffff800020db3c40,0) at pageflttrap+0x7f sys/arch/amd64/amd64/trap.c:180 kerntrap(ffff800020db3c40) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:302 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b pool_cache_gc(ffffffff8290ecd8) at pool_cache_gc+0x138 pool_cache_list_put sys/kern/subr_pool.c:1970 [inline] pool_cache_gc(ffffffff8290ecd8) 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(ffffffff827454f0) 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(ffffffff823fa309) at panic+0x15c sys/kern/subr_prf.c:207 witness_checkorder(ffffffff828b3f90,9,0) at witness_checkorder+0x10e0 sys/kern/subr_witness.c:821 __mp_lock(ffffffff828b3d88) at __mp_lock+0xa1 read_rflags machine/cpufunc.h:195 [inline] __mp_lock(ffffffff828b3d88) at __mp_lock+0xa1 intr_disable machine/cpufunc.h:216 [inline] __mp_lock(ffffffff828b3d88) at __mp_lock+0xa1 sys/kern/kern_lock.c:142 pageflttrap(ffff800020db3c40,0) at pageflttrap+0x7f sys/arch/amd64/amd64/trap.c:180 kerntrap(ffff800020db3c40) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:302 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b pool_cache_gc(ffffffff8290ecd8) at pool_cache_gc+0x138 pool_cache_list_put sys/kern/subr_pool.c:1970 [inline] pool_cache_gc(ffffffff8290ecd8) 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(ffffffff827454f0) 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 0xffff800020db39b0 rbx 0xffff800020db3a60 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff81e379ff kprintf+0x16f r9 0x1 r10 0x2 r11 0xa0cc278568df6f2d r12 0x3000000008 r13 0xffff800020db39c0 r14 0x100 r15 0x1 rip 0xffffffff811ebcb8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020db39a0 ss 0 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (systqmp) pid=235512 stat=onproc flags process=14000 proc=200 pri=32, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020d98ea0,0xffff800020d984f0 process=0xffff800020d9a000 user=0xffff800020dae000, vmspace=0xffffffff828a8098 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 54339 448313 0 0 3 0x14280 nfsidl nfsio 28870 39472 0 0 3 0x14280 nfsidl nfsio 30226 181688 0 0 3 0x14280 nfsidl nfsio 93552 389615 0 0 3 0x14280 nfsidl nfsio 52668 163231 0 0 3 0x14280 nfsidl nfsio 7974 471760 0 0 3 0x14280 nfsidl nfsio 87141 174771 0 0 3 0x14280 nfsidl nfsio 48769 82306 0 0 3 0x14280 nfsidl nfsio 35290 236816 0 0 3 0x14280 nfsidl nfsio 26219 278895 0 0 3 0x14280 nfsidl nfsio 10920 220189 0 0 3 0x14280 nfsidl nfsio 58150 465039 0 0 3 0x14280 nfsidl nfsio 81692 211990 0 0 3 0x14280 nfsidl nfsio 70692 244665 0 0 3 0x14280 nfsidl nfsio 8250 383863 0 0 3 0x14280 nfsidl nfsio 25592 357350 0 0 3 0x14280 nfsidl nfsio 48776 493481 0 0 3 0x14280 nfsidl nfsio 73185 400673 0 0 3 0x14280 nfsidl nfsio 19928 512289 0 0 3 0x14280 nfsidl nfsio 45313 508186 0 0 3 0x14280 nfsidl nfsio 67137 91246 0 0 3 0x14200 acct acct 60787 445518 0 0 3 0x14200 bored sosplice 43053 340912 43050 0 3 0x82 piperd syz-executor.1 61881 509555 43050 0 3 0x82 piperd syz-executor.0 43050 99185 69083 0 3 0x82 thrsleep syz-fuzzer 43050 476111 69083 0 3 0x4000082 nanosleep syz-fuzzer 43050 310899 69083 0 3 0x4000082 thrsleep syz-fuzzer 43050 333004 69083 0 3 0x4000082 thrsleep syz-fuzzer 43050 259543 69083 0 3 0x4000082 thrsleep syz-fuzzer 43050 472682 69083 0 2 0x4000002 syz-fuzzer 43050 496004 69083 0 2 0x4000002 syz-fuzzer 43050 219088 69083 0 3 0x4000082 thrsleep syz-fuzzer 43050 134016 69083 0 3 0x4000082 thrsleep syz-fuzzer 43050 195305 69083 0 3 0x4000082 thrsleep syz-fuzzer 69083 485715 65193 0 3 0x10008a pause ksh 65193 469341 2459 0 3 0x92 select sshd 11902 481837 1 0 3 0x100083 ttyopn getty 2459 53781 1 0 3 0x80 select sshd 47660 15554 3065 74 3 0x100092 bpf pflogd 3065 524220 1 0 3 0x80 netio pflogd 55862 191663 16348 73 3 0x100090 kqread syslogd 16348 155415 1 0 3 0x100082 netio syslogd 77661 300618 1 77 3 0x100090 poll dhclient 556 101787 1 0 3 0x80 poll dhclient 16672 374378 0 0 3 0x14200 bored smr 69512 375274 0 0 3 0x14200 pgzero zerothread 99884 36729 0 0 3 0x14200 aiodoned aiodoned 91440 302746 0 0 7 0x14200 update 66508 24640 0 0 3 0x14200 cleaner cleaner 24973 99883 0 0 3 0x14200 reaper reaper 78205 145759 0 0 3 0x14200 pgdaemon pagedaemon 1166 90132 0 0 3 0x14200 bored crynlk 87941 32279 0 0 3 0x14200 bored crypto 97296 508620 0 0 3 0x40014200 acpi0 acpi0 36516 312608 0 0 3 0x40014200 idle1 37221 257450 0 0 3 0x14200 bored softnet *16138 235512 0 0 7 0x14200 systqmp 82842 16791 0 0 3 0x14200 bored systq 4847 8817 0 0 3 0x40014200 bored softclock 40279 424211 0 0 3 0x40014200 idle0 1 265178 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive sched_lock &sched_lock r = 0 (0xffffffff8289ec38) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 sleep_setup+0xf1 sys/kern/kern_synch.c:380 #2 msleep+0xe5 sleep_setup_timeout sys/kern/kern_synch.c:435 [inline] #2 msleep+0xe5 sys/kern/kern_synch.c:245 #3 taskq_next_work+0x8d 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 (0xffffffff8290ece8) #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 16138 (systqmp) thread 0xffff800020d989c0 (235512) shared rwlock pools r = 0 (0xffffffff827558c0) #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 (0xffffffff82745560) #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 (0xffffffff8290ece8) #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 9529 6420K 6722K 78643K 11156 0 pcb 13 8K 8K 78643K 120 0 rtable 68 3K 4K 78643K 367 0 ifaddr 81 15K 16K 78643K 151 0 sysctl 2 0K 0K 78643K 2 0 counters 43 33K 34K 78643K 51 0 ioctlops 0 0K 8K 78643K 1550 0 iov 0 0K 32K 78643K 77 0 mount 1 1K 1K 78643K 1 0 vnodes 1220 77K 77K 78643K 1457 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 10 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 85 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 4 9K 25K 78643K 493 0 sigio 0 0K 0K 78643K 2 0 proc 62 63K 83K 78643K 465 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 36 0 in_multi 52 2K 2K 78643K 120 0 ether_multi 1 0K 0K 78643K 16 0 mrt 0 0K 0K 78643K 5 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 55 254K 254K 78643K 55 0 exec 0 0K 1K 78643K 254 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 137 88K 88K 78643K 2474 0 UVM aobj 15 2K 2K 78643K 25 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 88 0 NDP 13 0K 0K 78643K 24 0 temp 119 3852K 3916K 78643K 21602 0 kqueue 3 4K 9K 78643K 18 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 9 0 4 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 32 0 30 1 0 1 1 0 8 0 rtentry 112 70 0 47 2 0 2 2 0 8 0 unpcb 120 238 0 228 1 0 1 1 0 8 0 syncache 264 8 0 8 3 3 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 440 0 440 1 1 0 1 0 8 0 tcpcb 544 168 0 164 1 0 1 1 0 8 0 inpcb 280 557 0 550 3 2 1 2 0 8 0 rttmr 72 2 0 2 1 1 0 1 0 8 0 nd6 48 9 0 8 1 0 1 1 0 8 0 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pffrag 232 4 0 3 2 1 1 1 0 482 0 pffrnode 88 4 0 3 2 1 1 1 0 8 0 pffrent 40 94 0 93 2 1 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 pfrktable 1344 23 0 21 3 2 1 1 0 8 0 pftag 88 4 0 4 2 2 0 1 0 8 0 pfstitem 24 42 0 37 1 0 1 1 0 8 0 pfstkey 112 42 0 37 2 0 2 2 0 8 0 pfstate 328 41 0 36 4 1 3 4 0 8 0 pfrule 1360 34 0 29 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 341 0 212 12 2 10 12 0 8 0 art_table 32 342 0 212 2 0 2 2 0 8 0 art_node 16 69 0 48 1 0 1 1 0 8 0 sysvmsgpl 40 34 0 11 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 83 0 73 1 0 1 1 0 8 0 shmpl 112 23 0 10 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2097 0 695 89 1 88 89 0 8 0 ffsino 272 2097 0 695 94 0 94 94 0 8 0 nchpl 144 3266 0 1653 60 0 60 60 0 8 0 uvmvnodes 72 2290 0 0 42 0 42 42 0 8 0 vnodes 208 2290 0 0 121 0 121 121 0 8 0 namei 1024 9156 0 9156 1 1 0 1 0 8 0 percpumem 16 36 0 4 1 0 1 1 0 8 0 vcpupl 1984 6 0 0 1 0 1 1 0 8 0 vmpool 560 8 0 2 2 1 1 1 0 8 0 pfiaddrpl 120 6 0 4 3 2 1 1 0 8 0 scsiplug 64 1 0 1 1 1 0 1 0 8 0 scxspl 192 9635 0 9632 13 12 1 7 0 8 0 plimitpl 152 47 0 39 1 0 1 1 0 8 0 sigapl 424 730 0 678 6 0 6 6 0 8 0 futexpl 56 9265 0 9265 1 1 0 1 0 8 0 knotepl 112 77 0 58 1 0 1 1 0 8 0 kqueuepl 144 50 0 48 1 0 1 1 0 8 0 pipelkpl 48 329 0 319 1 0 1 1 0 8 0 pipepl 120 658 0 639 1 0 1 1 0 8 0 fdescpl 496 693 0 678 3 0 3 3 0 8 0 filepl 152 4826 0 4726 6 2 4 6 0 8 0 lockfpl 104 171 0 170 1 0 1 1 0 8 0 lockfspl 48 51 0 50 1 0 1 1 0 8 0 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 24 0 13 1 0 1 1 0 8 0 ucredpl 96 438 0 429 1 0 1 1 0 8 0 zombiepl 144 678 0 678 1 1 0 1 0 8 0 processpl 984 730 0 678 7 0 7 7 0 8 0 procpl 624 1704 0 1643 6 1 5 6 0 8 0 sosppl 128 3 0 3 1 1 0 1 0 8 0 sockpl 400 829 0 810 6 4 2 6 0 8 0 mcl64k 65536 10 0 0 2 0 2 2 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 5 0 0 1 0 1 1 0 8 0 mcl9k 9216 9 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 7 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 170 0 0 21 1 20 21 0 8 0 mtagpl 80 33 0 0 1 0 1 1 0 8 0 mbufpl 256 760 0 0 46 0 46 46 0 8 0 bufpl 280 4842 0 138 336 0 336 336 0 8 0 anonpl 16 71740 0 55689 69 4 65 67 0 124 0 amapchunkpl 152 3525 0 3378 8 0 8 8 0 158 0 amappl16 192 3019 0 2164 45 2 43 45 0 8 0 amappl15 184 2 0 1 2 1 1 1 0 8 0 amappl14 176 114 0 108 1 0 1 1 0 8 0 amappl13 168 29 0 26 1 0 1 1 0 8 0 amappl12 160 466 0 461 1 0 1 1 0 8 0 amappl11 152 68 0 52 1 0 1 1 0 8 0 amappl10 144 29 0 21 1 0 1 1 0 8 0 amappl9 136 393 0 392 1 0 1 1 0 8 0 amappl8 128 375 0 332 2 0 2 2 0 8 0 amappl7 120 120 0 108 1 0 1 1 0 8 0 amappl6 112 33 0 22 1 0 1 1 0 8 0 amappl5 104 873 0 857 1 0 1 1 0 8 0 amappl4 96 580 0 551 1 0 1 1 0 8 0 amappl3 88 218 0 211 1 0 1 1 0 8 0 amappl2 80 4607 0 4547 2 0 2 2 0 8 0 amappl1 72 24099 0 23674 23 13 10 18 0 8 0 amappl 80 1936 0 1887 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 24 0 10 1 0 1 1 0 8 0 uaddrrnd 24 701 0 680 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 701 0 680 1 0 1 1 0 8 0 vmmpekpl 168 10250 0 10213 2 0 2 2 0 8 0 vmmpepl 168 89323 0 87391 120 31 89 111 0 357 0 vmsppl 368 700 0 680 2 0 2 2 0 8 0 pdppl 4096 1409 0 1366 7 1 6 6 0 8 0 pvpl 32 243598 0 224423 165 9 156 163 0 265 0 pmappl 232 700 0 680 3 1 2 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 298 0 14 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff82700ff0) 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 _rb_find(ffffffff824a61a0,fffffd807efc4548,ffff800020deb3f0) at _rb_find+0x90 sys/kern/subr_tree.c:452 getblk(fffffd807efc44e0,2d80,800,0,ffffffffffffffff) at getblk+0xa4 sys/kern/vfs_bio.c:1016 ffs_sbupdate(ffff8000006b1200,3) at ffs_sbupdate+0xff sys/ufs/ffs/ffs_vfsops.c:1505 ffs_sync(ffff8000006c0000,3,0,fffffd807f7bfc00,ffff800020ded5f8) at ffs_sync+0x2c9 sys/ufs/ffs/ffs_vfsops.c:1294 sync_fsync(ffff800020deb730) at sync_fsync+0x1b0 sys/kern/vfs_sync.c:338 VOP_FSYNC(fffffd806fa100e0,fffffd807f7bfc00,3,ffff800020ded5f8) at VOP_FSYNC+0xbf sys/kern/vfs_vops.c:353 syncer_thread(ffff800020ded5f8) at syncer_thread+0x241 sys/kern/vfs_sync.c:169 end trace frame: 0x0, count: 5 ddb{0}> trace x86_ipi_db(ffffffff82700ff0) 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 _rb_find(ffffffff824a61a0,fffffd807efc4548,ffff800020deb3f0) at _rb_find+0x90 sys/kern/subr_tree.c:452 getblk(fffffd807efc44e0,2d80,800,0,ffffffffffffffff) at getblk+0xa4 sys/kern/vfs_bio.c:1016 ffs_sbupdate(ffff8000006b1200,3) at ffs_sbupdate+0xff sys/ufs/ffs/ffs_vfsops.c:1505 ffs_sync(ffff8000006c0000,3,0,fffffd807f7bfc00,ffff800020ded5f8) at ffs_sync+0x2c9 sys/ufs/ffs/ffs_vfsops.c:1294 sync_fsync(ffff800020deb730) at sync_fsync+0x1b0 sys/kern/vfs_sync.c:338 VOP_FSYNC(fffffd806fa100e0,fffffd807f7bfc00,3,ffff800020ded5f8) at VOP_FSYNC+0xbf sys/kern/vfs_vops.c:353 syncer_thread(ffff800020ded5f8) at syncer_thread+0x241 sys/kern/vfs_sync.c:169 end trace frame: 0x0, count: -10 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(ffffffff823fa309) at panic+0x15c sys/kern/subr_prf.c:207 witness_checkorder(ffffffff828b3f90,9,0) at witness_checkorder+0x10e0 sys/kern/subr_witness.c:821 __mp_lock(ffffffff828b3d88) at __mp_lock+0xa1 read_rflags machine/cpufunc.h:195 [inline] __mp_lock(ffffffff828b3d88) at __mp_lock+0xa1 intr_disable machine/cpufunc.h:216 [inline] __mp_lock(ffffffff828b3d88) at __mp_lock+0xa1 sys/kern/kern_lock.c:142 pageflttrap(ffff800020db3c40,0) at pageflttrap+0x7f sys/arch/amd64/amd64/trap.c:180 kerntrap(ffff800020db3c40) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:302 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b pool_cache_gc(ffffffff8290ecd8) at pool_cache_gc+0x138 pool_cache_list_put sys/kern/subr_pool.c:1970 [inline] pool_cache_gc(ffffffff8290ecd8) 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(ffffffff827454f0) 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(ffffffff823fa309) at panic+0x15c sys/kern/subr_prf.c:207 witness_checkorder(ffffffff828b3f90,9,0) at witness_checkorder+0x10e0 sys/kern/subr_witness.c:821 __mp_lock(ffffffff828b3d88) at __mp_lock+0xa1 read_rflags machine/cpufunc.h:195 [inline] __mp_lock(ffffffff828b3d88) at __mp_lock+0xa1 intr_disable machine/cpufunc.h:216 [inline] __mp_lock(ffffffff828b3d88) at __mp_lock+0xa1 sys/kern/kern_lock.c:142 pageflttrap(ffff800020db3c40,0) at pageflttrap+0x7f sys/arch/amd64/amd64/trap.c:180 kerntrap(ffff800020db3c40) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:302 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b pool_cache_gc(ffffffff8290ecd8) at pool_cache_gc+0x138 pool_cache_list_put sys/kern/subr_pool.c:1970 [inline] pool_cache_gc(ffffffff8290ecd8) 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(ffffffff827454f0) at taskq_thread+0xec sys/kern/kern_task.c:437 end trace frame: 0x0, count: -10