uvm_fault(0xfffffd805ffe0220, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff825c94b8 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80003b7f7d10 gsbase 0xffff8000299ddff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff825c94b8 Starting stack trace... panic(ffffffff833e34e2) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003b7f7c60) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff8000015a9000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,81,2000,ffff8000fffeefa8) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff8000fffeefa8) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003b7f7e10) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8060eb5108,81,fffffd80097fd270,ffff8000fffeefa8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c80ccc0,ffff8000fffeefa8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c80ccc0,ffff8000fffeefa8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c80ccc0,ffff8000fffeefa8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c80ccc0,ffff8000fffeefa8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000fffeefa8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000fffeefa8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffeefa8,ffff80003b7f8180,ffff80003b7f80d0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003b7f8180) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003b7f8180) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7201fb6460c0, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON TRAP EXIT 4 0 Stopped at proc_trampoline+0xc7: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND * 21470 74673 0 0 0 1 syz-executor 232227 74673 0 0 0x4000000 0 syz-executor proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x7f61fd759c90, count: 14 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 *cpu1: uvm_fault(0xfffffd805ffe0220, 0x0, 0, 1) -> e ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x7f61fd759c90, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff8000353dacb0 rbx 0 rdx 0 rcx 0xffff80003c416a88 rax 0x2a r8 0xffff8000353dabe0 r9 0x1 r10 0x506faf70db61dcb4 r11 0xd187cf438de99a60 r12 0 r13 0xffffffff825c0cd8 Xdoreti+0x18 r14 0 r15 0 rip 0xffffffff81ede4c7 proc_trampoline+0xc7 cs 0x8 rflags 0x246 rsp 0xffff8000353dac30 ss 0x10 proc_trampoline+0xc7: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=21470 pid=74673 tcnt=4 stat=onproc flags process=0 proc=0 runpri=85, usrpri=85, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffeefa8,0xffff8000fffefa18 process=0xffff8000fffe89b8 user=0xffff8000353d5000, vmspace=0xfffffd805ffe0408 estcpu=35, cpticks=5, pctcpu=0.2, user=4, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 59365 396761 57413 0 2 0 syz-executor 4252 402054 24038 0 2 0 syz-executor 4252 388056 24038 0 3 0x4000080 fsleep syz-executor 55435 349429 46 0 2 0 syz-executor 55435 212067 46 0 3 0x4000080 nanoslp syz-executor *74673 21470 18282 0 7 0 syz-executor 74673 232227 18282 0 7 0x4000000 syz-executor 74673 86453 18282 0 3 0x4000000 inode syz-executor 74673 154123 18282 0 3 0x4000000 inode syz-executor 35572 259874 71334 0 3 0x80 nanoslp syz-executor 35572 44137 71334 0 3 0x4000080 ttyout syz-executor 35572 59858 71334 0 3 0x4000080 fsleep syz-executor 6063 371712 2518 0 2 0 syz-executor 6063 116360 2518 0 3 0x4000080 fsleep syz-executor 6063 54029 2518 0 3 0x4000080 sbwait syz-executor 6063 4436 2518 0 3 0x4000080 fsleep syz-executor 18282 87806 15350 0 3 0x82 nanoslp syz-executor 71202 267695 0 0 3 0x14200 acct acct 93169 207228 15350 0 3 0x82 nanoslp syz-executor 96786 465283 15350 0 3 0x82 nanoslp syz-executor 2518 493256 15350 0 2 0x2 syz-executor 24038 321148 15350 0 3 0x82 nanoslp syz-executor 71334 198910 15350 0 3 0x82 nanoslp syz-executor 57413 353509 15350 0 3 0x82 nanoslp syz-executor 46 198878 15350 0 3 0x82 nanoslp syz-executor 15350 130307 83170 0 3 0x82 kqread syz-executor 83170 83008 51010 0 3 0x10008a sigsusp ksh 51010 304825 47580 0 3 0x98 kqread sshd-session 47580 387636 58476 0 3 0x92 kqread sshd-session 90318 451902 1 0 3 0x100083 ttyopn getty 58476 302427 1 0 3 0x88 kqread sshd 79747 353786 45225 74 3 0x1100092 bpf pflogd 45225 168539 1 0 3 0x80 sbwait pflogd 73443 463367 55146 73 3 0x1100090 kqread syslogd 55146 247048 1 0 3 0x100082 sbwait syslogd 49519 517638 1 0 3 0x100080 kqread resolvd 82166 311218 6622 77 3 0x100092 kqread dhcpleased 90154 158303 6622 77 3 0x100092 kqread dhcpleased 6622 69098 1 0 3 0x80 kqread dhcpleased 28737 37950 0 0 3 0x14200 bored smr 81152 7788 0 0 2 0x14200 zerothread 37917 480827 0 0 3 0x14200 aiodoned aiodoned 98801 182324 0 0 3 0x14200 syncer update 30944 433249 0 0 3 0x14200 cleaner cleaner 84956 32874 0 0 2 0x14200 reaper 49008 210730 0 0 3 0x14200 pgdaemon pagedaemon 35957 136693 0 0 3 0x14200 bored viomb 70767 134496 0 0 3 0x40014200 acpi0 acpi0 51378 475107 0 0 3 0x40014200 idle1 44294 241225 0 0 3 0x14200 bored softnet1 34727 282902 0 0 3 0x14200 bored softnet0 48132 220684 0 0 2 0x40014200 systqmp 62609 286458 0 0 3 0x14200 bored systq 1375 183676 0 0 3 0x14200 tmoslp softclockmp 76528 299361 0 0 3 0x40014200 tmoslp softclock 7913 409584 0 0 3 0x40014200 idle0 1 179360 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806c7a8e10) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 pmap_do_remove+0xa9 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #2 pmap_do_remove+0xa9 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline] #2 pmap_do_remove+0xa9 sys/arch/amd64/amd64/pmap.c:1824 #3 uvm_unmap_kill_entry_withlock+0x269 sys/uvm/uvm_map.c:1863 #4 uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] #4 uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2486 #5 exit1+0x6fc sys/kern/kern_exit.c:260 #6 sys_exit+0x1a sys/kern/kern_exit.c:-1 #7 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #8 Xsyscall+0x128 Process 74673 (syz-executor) thread 0xffff8000fffefa08 (232227) exclusive rrwlock inode r = 0 (0xfffffd806ea4e480) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 74673 (syz-executor) thread 0xffff80003c417250 (86453) exclusive rrwlock inode r = 0 (0xfffffd806c6b2330) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 uipc_bind+0x328 sys/kern/uipc_usrreq.c:371 #8 sys_bind+0x2f6 sys/kern/uipc_syscalls.c:190 #9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #10 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11113 12476K 13860K 166960K 15811 0 pcb 19 16K 18K 166960K 367 0 rtable 345 14K 15K 166960K 839 0 pf 36 18K 21K 166960K 182 0 ifaddr 39 7K 8K 166960K 128 0 ifgroup 55 2K 2K 166960K 213 0 sysctl 3 1K 9K 166960K 46 0 counters 70 37K 38K 166960K 328 0 ioctlops 0 0K 4K 166960K 1880 0 iov 1 16K 44K 166960K 74 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1458 92K 92K 166960K 3294 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 2K 9K 166960K 26 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 140 0 dirhash 12 2K 2K 166960K 42 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 110K 166960K 1772 0 sigio 0 0K 0K 166960K 131 0 proc 73 115K 180K 166960K 716 0 subproc 72 4K 4K 166960K 91 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 323 0 in_multi 76 5K 7K 166960K 196 0 ether_multi 1 0K 0K 166960K 25 0 mrt 1 0K 0K 166960K 13 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 109 493K 493K 166960K 109 0 exec 0 0K 1K 166960K 695 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 4 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 252 161K 176K 166960K 17841 0 UVM aobj 53 12K 12K 166960K 58 0 pinsyscall 42 84K 106K 166960K 2979 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 215 0 NDP 14 0K 2K 166960K 90 0 temp 80 8680K 8936K 166960K 55301 0 kqueue 15 24K 30K 166960K 310 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 201 0 198 3 2 1 2 0 8 0 rtentry 176 227 0 80 8 0 8 8 0 8 0 unpcb 144 1016 0 994 13 12 1 6 0 8 0 syncache 336 12 0 12 5 4 1 1 0 8 1 tcpqe 32 6 0 6 3 2 1 1 0 8 1 tcpcb 736 588 0 578 19 12 7 7 0 8 4 arp 136 88 0 9 3 0 3 3 0 8 0 inpcb 328 1990 0 1972 25 18 7 11 0 8 4 nd6 152 34 0 13 2 0 2 2 0 8 0 pkpcb 40 72 0 72 2 2 0 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 113 0 113 2 1 1 1 0 8 1 pppxif 1504 7 0 7 3 2 1 1 0 8 1 pffrag 232 12 0 4 1 0 1 1 0 482 0 pffrnode 88 10 0 3 1 0 1 1 0 8 0 pffrent 40 17 0 9 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfrktable 1344 6 0 6 3 2 1 1 0 8 1 pfstitem 24 115 0 46 1 0 1 1 0 8 0 pfstkey 128 117 0 48 3 0 3 3 0 8 0 pfstate 448 115 0 47 8 0 8 8 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 4 0 4 3 3 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 680 0 349 31 6 25 31 0 8 3 art_table 40 683 0 349 5 0 5 5 0 8 0 art_node 32 227 0 154 2 1 1 2 0 8 0 sysvmsgpl 40 5 0 3 1 0 1 1 0 8 0 semapl 112 134 0 124 1 0 1 1 0 8 0 shmpl 112 50 0 5 2 0 2 2 0 8 0 dirhash 1024 37 0 20 3 0 3 3 0 8 0 dino2pl 256 4572 0 3075 95 0 95 95 0 8 0 ffsino 296 4572 0 3075 117 0 117 117 0 8 0 nchpl 144 7025 0 5320 64 0 64 64 0 8 0 rtmask 32 24 0 24 5 4 1 1 0 8 1 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 24106 0 24104 2 1 1 2 0 8 0 percpumem 16 179 0 129 1 0 1 1 0 8 0 vcpupl 3968 5 0 0 1 0 1 1 0 8 0 vmpool 848 5 0 0 1 0 1 1 0 8 0 kstatmem 264 140 0 112 3 0 3 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 7 0 7 5 4 1 1 0 8 1 scxspl 216 38941 0 38941 12 11 1 7 1 8 1 plimitpl 152 245 0 226 1 0 1 1 0 8 0 sigapl 424 2106 0 2057 9 3 6 8 0 8 0 knotepl 120 550 0 0 16 0 16 16 0 8 0 kqueuepl 224 515 0 504 3 1 2 2 0 8 1 pipepl 344 337 0 308 8 5 3 6 0 8 0 fdescpl 528 2061 0 2030 3 0 3 3 0 8 0 filepl 160 13104 0 12866 28 12 16 18 0 8 5 lockfpl 104 1063 0 1060 3 2 1 2 0 8 0 lockfspl 48 283 0 280 1 0 1 1 0 8 0 sessionpl 144 31 0 22 1 0 1 1 0 8 0 pgrppl 48 71 0 54 1 0 1 1 0 8 0 ucredpl 104 1492 0 1479 1 0 1 1 0 8 0 zombiepl 144 2059 0 2057 1 0 1 1 0 8 0 processpl 1232 2106 0 2057 8 4 4 6 0 8 0 procpl 664 4904 0 4845 7 1 6 7 0 8 0 sosppl 176 9 0 9 2 2 0 1 0 8 0 sockpl 752 3313 0 3270 40 29 11 18 0 8 6 mcl64k 65536 12 0 0 2 0 2 2 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 128 0 0 16 0 16 16 0 8 0 mcl2k 2048 61 0 0 7 0 7 7 0 8 0 mtagpl 96 191 0 0 5 0 5 5 0 8 0 mbufpl 256 416 0 0 25 0 25 25 0 8 0 bufpl 280 15470 0 9334 439 0 439 439 0 8 0 anonpl 32 12241 0 0 99 0 99 99 0 246 0 amapchunkpl 152 61040 0 60442 52 17 35 35 0 158 9 amappl16 200 5764 0 5724 59 47 12 26 0 8 4 amappl15 192 55 0 55 1 1 0 1 0 8 0 amappl14 184 24 0 24 2 1 1 1 0 8 1 amappl13 176 449 0 448 1 0 1 1 0 8 0 amappl12 168 2483 0 2442 3 0 3 3 0 8 0 amappl11 160 1 0 1 1 1 0 1 0 8 0 amappl10 152 61 0 47 1 0 1 1 0 8 0 amappl9 144 261 0 261 1 1 0 1 0 8 0 amappl8 136 28 0 25 1 0 1 1 0 8 0 amappl7 128 101 0 100 1 0 1 1 0 8 0 amappl6 120 300 0 286 1 0 1 1 0 8 0 amappl5 112 78 0 67 1 0 1 1 0 8 0 amappl4 104 466 0 433 1 0 1 1 0 8 0 amappl3 96 12278 0 12171 5 1 4 4 0 8 0 amappl2 88 627 0 566 2 0 2 2 0 8 0 amappl1 80 17873 0 17278 15 0 15 15 0 8 0 amappl 88 16789 0 16615 5 0 5 5 0 92 0 uvmvnodes 80 168 0 0 4 0 4 4 0 8 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 255 0 255 3 3 0 1 0 8 0 dma64 64 41 0 41 4 3 1 1 0 8 1 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 72 57 0 5 1 0 1 1 0 8 0 uaddrrnd 24 2061 0 2030 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2061 0 2030 1 0 1 1 0 8 0 vmmpekpl 168 18540 0 18490 3 0 3 3 0 8 0 vmmpepl 168 136001 0 134048 129 33 96 108 0 357 5 vmsppl 488 2060 0 2029 8 3 5 5 0 8 0 rwobjpl 80 36155 0 34980 38 9 29 33 0 8 0 pdppl 4096 4140 0 4063 118 39 79 86 0 8 2 pvpl 32 21328 0 0 172 0 172 172 0 265 0 pmappl 256 2065 0 2029 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 345 0 67 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837efff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff838c86c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838c86c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 __mp_acquire_count(ffffffff838c86c0,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 biowait(fffffd806012fa10) at biowait+0xc6 sys/kern/vfs_bio.c:1242 bwrite(fffffd806012fa10) at bwrite+0x2e7 sys/kern/vfs_bio.c:754 ffs2_balloc(fffffd806ea4e3e0,1cc000,4000,fffffd80097fd270,2,ffff800038be69e8) at ffs2_balloc+0x18b4 sys/ufs/ffs/ffs_balloc.c:701 ffs_write(ffff800038be6a70) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd806b2ee960,ffff800038be6c28,7,fffffd80097fd270) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd806cbff2a0,ffff800038be6c28,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408 dofilewritev(ffff8000fffefa08,3,ffff800038be6c28,0,ffff800038be6ce0) at dofilewritev+0x242 sys/kern/sys_generic.c:380 sys_write(ffff8000fffefa08,ffff800038be6d90,ffff800038be6ce0) at sys_write+0xa2 sys/kern/sys_generic.c:300 end trace frame: 0xffff800038be6d80, count: 0 ddb{0}> trace x86_ipi_db(ffffffff837efff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff838c86c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838c86c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 __mp_acquire_count(ffffffff838c86c0,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 biowait(fffffd806012fa10) at biowait+0xc6 sys/kern/vfs_bio.c:1242 bwrite(fffffd806012fa10) at bwrite+0x2e7 sys/kern/vfs_bio.c:754 ffs2_balloc(fffffd806ea4e3e0,1cc000,4000,fffffd80097fd270,2,ffff800038be69e8) at ffs2_balloc+0x18b4 sys/ufs/ffs/ffs_balloc.c:701 ffs_write(ffff800038be6a70) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd806b2ee960,ffff800038be6c28,7,fffffd80097fd270) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd806cbff2a0,ffff800038be6c28,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408 dofilewritev(ffff8000fffefa08,3,ffff800038be6c28,0,ffff800038be6ce0) at dofilewritev+0x242 sys/kern/sys_generic.c:380 sys_write(ffff8000fffefa08,ffff800038be6d90,ffff800038be6ce0) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff800038be6d90) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800038be6d90) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4956e22c330, count: -16 ddb{0}> machine ddbcpu 1 Stopped at proc_trampoline+0xc7: movl $0,%gs:0x688 proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x7f61fd759c90, count: 14 ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x7f61fd759c90, count: -1