uvm_fault(0xfffffd8073efc7b8, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff832f5a78 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80003c425f10 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff832f5a78 Starting stack trace... panic(ffffffff833deb92) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003c425e60) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001511000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,81,2000,ffff80003c43a558) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003c43a558) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003c426010) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805ea7b798,81,fffffd80097fd1a0,ffff80003c43a558) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c9a54b8,ffff80003c43a558) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c9a54b8,ffff80003c43a558) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c9a54b8,ffff80003c43a558) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c9a54b8,ffff80003c43a558) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c43a558) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c43a558,b,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c43a558,ffff80003c426380,ffff80003c4262d0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c426380) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c426380) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7be6a71f7690, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 11 -1 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 49316 92517 0 0x2 0 0 syz-executor *414821 49777 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x734264d03040, 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}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xfffffd8073efc7b8, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x734264d03040, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a396510 rbx 0 rdx 0 rcx 0xffff80002a28efa8 rax 0x33 r8 0xffff80002a396440 r9 0x1 r10 0x4d83afbf5076923d r11 0x5ea9dc0b3e788a43 r12 0 r13 0 r14 0xffff80002a28efa8 r15 0 rip 0xffffffff81eee3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a396490 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=414821 pid=49777 tcnt=1 stat=onproc flags process=2 proc=0 runpri=83, usrpri=83, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a28f4d8,0xffff80002a28ea88 process=0xffff8000ffff44d8 user=0xffff80002a391000, vmspace=0xfffffd800b063988 estcpu=33, cpticks=54, pctcpu=0.16, user=2, sys=49, intr=3 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 96909 159996 12538 0 2 0 syz-executor 96909 55057 12538 0 3 0x4000080 fsleep syz-executor 96909 113085 12538 0 3 0x4000080 fsleep syz-executor 96909 218160 12538 0 3 0x4000080 fsleep syz-executor 64195 87954 49777 0 2 0 syz-executor 64195 438881 49777 0 2 0x4000000 syz-executor 64195 318178 49777 0 3 0x4000080 fsleep syz-executor 64195 385146 49777 0 3 0x4000080 fsleep syz-executor 12503 422209 64391 0 2 0 syz-executor 12503 502645 64391 0 3 0x4000080 fsleep syz-executor 88886 451655 60300 60928 2 0x10 syz-executor 88886 469063 60300 60928 3 0x4000090 fsleep syz-executor 88886 342545 60300 60928 3 0x4000090 fsleep syz-executor 96814 318419 50351 0 2 0 syz-executor 96814 161333 50351 0 3 0x4000080 fsleep syz-executor 63321 217575 61820 0 3 0x82 wait syz-executor 64391 127708 61820 0 2 0xc82 syz-executor 44807 319717 0 0 3 0x14200 acct acct 12538 497443 61820 0 2 0xc82 syz-executor 92517 49316 61820 0 7 0x2 syz-executor *49777 414821 61820 0 7 0x2 syz-executor 60300 35861 61820 0 2 0xc82 syz-executor 88807 442171 61820 0 2 0xc82 syz-executor 50351 70842 61820 0 2 0xc82 syz-executor 61820 27532 4558 0 3 0x82 kqread syz-executor 4558 16788 86073 0 3 0x10008a sigsusp ksh 86073 60290 55037 0 3 0x98 kqread sshd-session 55037 1569 85497 0 3 0x92 kqread sshd-session 99586 11233 1 0 2 0x100083 getty 85497 297153 1 0 3 0x88 kqread sshd 24477 27621 7734 74 3 0x1100092 bpf pflogd 7734 87292 1 0 3 0x80 sbwait pflogd 69701 504928 84144 73 3 0x1100090 kqread syslogd 84144 139467 1 0 3 0x100082 sbwait syslogd 55996 340514 1 0 3 0x100080 kqread resolvd 15750 215876 29028 77 3 0x100092 kqread dhcpleased 81472 462303 29028 77 3 0x100092 kqread dhcpleased 29028 39116 1 0 3 0x80 kqread dhcpleased 64985 105469 0 0 2 0x40014200 smr 47477 504556 0 0 2 0x14200 zerothread 52589 198770 0 0 3 0x14200 aiodoned aiodoned 46831 38454 0 0 3 0x14200 syncer update 73626 461144 0 0 3 0x14200 cleaner cleaner 40915 202327 0 0 3 0x14200 reaper reaper 73563 509180 0 0 3 0x14200 pgdaemon pagedaemon 49369 248084 0 0 3 0x14200 bored viomb 27117 253308 0 0 3 0x40014200 acpi0 acpi0 55255 107474 0 0 3 0x40014200 idle1 56655 311031 0 0 3 0x14200 bored softnet1 20845 188583 0 0 2 0x14200 softnet0 58547 517648 0 0 3 0x14200 smrbar systqmp 27179 132461 0 0 3 0x14200 bored systq 44181 203635 0 0 3 0x14200 netlock softclockmp 98441 28938 0 0 3 0x40014200 tmoslp softclock 33482 378539 0 0 3 0x40014200 idle0 1 397126 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 92517 (syz-executor) thread 0xffff80002a28ea78 (49316) exclusive rrwlock inode r = 0 (0xfffffd806c0e2ec8) #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+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #11 namei+0x7ca sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806d18c328) #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+0xa3 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 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #9 Xsyscall+0x128 Process 58547 (systqmp) thread 0xffff8000ffffe000 (517648) shared rwlock systqmp r = 0 (0xffffffff8386bad8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10241 11185K 12468K 166960K 13892 0 pcb 18 15K 16K 166960K 241 0 rtable 254 11K 12K 166960K 551 0 pf 38 18K 22K 166960K 190 0 ifaddr 43 8K 8K 166960K 117 0 ifgroup 55 2K 2K 166960K 199 0 sysctl 4 1K 9K 166960K 14 0 counters 68 36K 38K 166960K 352 0 ioctlops 0 0K 4K 166960K 1803 0 iov 0 0K 24K 166960K 148 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1525 96K 96K 166960K 2818 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 19 5K 5K 166960K 67 0 dirhash 12 2K 2K 166960K 42 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 106K 166960K 1162 0 sigio 0 0K 0K 166960K 153 0 proc 73 115K 180K 166960K 674 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 226 0 in_multi 94 6K 7K 166960K 174 0 ether_multi 1 0K 0K 166960K 10 0 mrt 1 0K 0K 166960K 11 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 253 1129K 1129K 166960K 253 0 exec 0 0K 1K 166960K 636 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 266 160K 173K 166960K 12414 0 UVM aobj 94 7K 9K 166960K 95 0 pinsyscall 42 84K 103K 166960K 2376 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 104 0 NDP 12 0K 2K 166960K 84 0 temp 78 8680K 8748K 166960K 54879 0 kqueue 15 24K 30K 166960K 216 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 120 100 0 97 1 0 1 1 0 8 0 rtentry 176 163 0 58 6 0 6 6 0 8 0 unpcb 144 1192 0 1123 8 5 3 6 0 8 0 syncache 336 11 0 11 1 0 1 1 0 8 1 tcpqe 32 7 0 7 2 2 0 1 0 8 0 tcpcb 736 426 0 355 12 5 7 7 0 8 0 arp 136 27 0 6 1 0 1 1 0 8 0 inpcb 328 1461 0 1383 12 5 7 7 0 8 0 nd6 152 34 0 8 1 0 1 1 0 8 0 pkpcb 40 8 0 7 1 0 1 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 127 0 127 1 0 1 1 0 8 1 pppxif 1504 4 0 4 2 1 1 1 0 8 1 pfstscr 40 4 0 1 1 0 1 1 0 8 0 pffrag 232 13 0 2 1 0 1 1 0 482 0 pffrnode 88 11 0 1 1 0 1 1 0 8 0 pffrent 40 19 0 7 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 1 0 1 1 1 0 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfstitem 24 87 0 26 1 0 1 1 0 8 0 pfstkey 128 87 0 26 3 0 3 3 0 8 0 pfstate 448 83 0 25 7 0 7 7 0 8 0 pfrule 1344 29 0 24 2 1 1 2 0 8 0 rttmr 136 2 0 2 2 2 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 728 0 289 33 3 30 31 0 8 1 art_table 40 731 0 289 5 0 5 5 0 8 0 art_node 32 162 0 67 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 8 1 0 1 1 0 8 0 semupl 112 4 0 4 2 1 1 1 0 8 1 semapl 112 61 0 44 1 0 1 1 0 8 0 shmpl 112 89 0 0 3 0 3 3 0 8 0 dirhash 1024 38 0 21 3 0 3 3 0 8 0 dino2pl 256 3635 0 2124 96 0 96 96 0 8 0 ffsino 296 3635 0 2124 118 0 118 118 0 8 0 nchpl 144 5263 0 4716 64 32 32 64 0 8 8 rtmask 32 13 0 13 1 0 1 1 0 8 1 vnodes 216 4699 0 0 262 0 262 262 0 8 0 namei 1024 18805 0 18805 1 0 1 1 0 8 1 percpumem 16 191 0 142 1 0 1 1 0 8 0 vcpupl 3968 3 0 1 1 0 1 1 0 8 0 vmpool 840 3 0 1 1 0 1 1 0 8 0 kstatmem 264 130 0 104 4 1 3 3 0 8 0 scsiplug 72 4 0 4 2 1 1 1 0 8 1 scxspl 216 23245 0 23245 10 9 1 8 1 8 1 plimitpl 152 335 0 317 1 0 1 1 0 8 0 sigapl 424 1473 0 1425 7 1 6 7 0 8 0 knotepl 120 313 0 0 10 0 10 10 0 8 0 kqueuepl 224 609 0 598 7 2 5 5 0 8 4 pipepl 344 356 0 263 12 3 9 9 0 8 0 fdescpl 528 1455 0 1424 3 0 3 3 0 8 0 filepl 160 11138 0 10663 25 5 20 20 0 8 0 lockfpl 104 717 0 715 2 0 2 2 0 8 1 lockfspl 48 189 0 187 1 0 1 1 0 8 0 sessionpl 144 27 0 18 1 0 1 1 0 8 0 pgrppl 48 87 0 70 1 0 1 1 0 8 0 ucredpl 104 1380 0 1366 1 0 1 1 0 8 0 zombiepl 144 1427 0 1425 1 0 1 1 0 8 0 processpl 1232 1473 0 1425 5 0 5 5 0 8 0 procpl 664 3196 0 3138 6 0 6 6 0 8 0 sosppl 176 5 0 5 2 1 1 1 0 8 1 sockpl 752 2823 0 2671 32 16 16 17 0 8 0 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 121 0 0 16 0 16 16 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 29 0 0 4 0 4 4 0 8 0 mtagpl 96 36 0 0 1 0 1 1 0 8 0 mbufpl 256 1806 0 0 113 0 113 113 0 8 0 bufpl 280 8249 0 2112 439 0 439 439 0 8 0 anonpl 32 11289 0 0 91 0 91 91 0 246 0 amapchunkpl 152 41159 0 40543 31 1 30 30 0 158 3 amappl16 200 4890 0 4768 27 8 19 19 0 8 4 amappl15 192 26 0 26 1 1 0 1 0 8 0 amappl14 184 9 0 8 1 0 1 1 0 8 0 amappl13 176 457 0 456 1 0 1 1 0 8 0 amappl12 168 1851 0 1809 3 0 3 3 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 47 0 32 1 0 1 1 0 8 0 amappl9 144 252 0 251 2 1 1 1 0 8 0 amappl8 136 29 0 26 1 0 1 1 0 8 0 amappl7 128 90 0 89 1 0 1 1 0 8 0 amappl6 120 309 0 296 1 0 1 1 0 8 0 amappl5 112 78 0 67 1 0 1 1 0 8 0 amappl4 104 470 0 440 1 0 1 1 0 8 0 amappl3 96 7219 0 7118 4 1 3 3 0 8 0 amappl2 88 1583 0 1507 2 0 2 2 0 8 0 amappl1 80 14551 0 13953 14 0 14 14 0 8 0 amappl 88 11431 0 11243 5 0 5 5 0 92 0 uvmvnodes 80 133 0 0 3 0 3 3 0 8 0 dma65536 65536 4 0 4 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 6 0 6 1 1 0 1 0 8 0 dma128 128 257 0 257 3 2 1 1 0 8 1 dma64 64 7 0 7 2 2 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 72 94 0 1 2 0 2 2 0 8 0 uaddrrnd 24 1455 0 1424 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1455 0 1424 1 0 1 1 0 8 0 vmmpekpl 168 13501 0 13455 3 0 3 3 0 8 0 vmmpepl 168 98576 0 96518 104 2 102 102 0 357 3 vmsppl 488 1454 0 1424 5 0 5 5 0 8 0 rwobjpl 80 28353 0 27073 32 1 31 31 0 8 1 pdppl 4096 2923 0 2852 112 39 73 85 0 8 2 pvpl 32 19566 0 0 159 1 158 158 0 265 0 pmappl 256 1457 0 1425 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 411 0 51 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8380fff0) 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(ffffffff83a09a20) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83a09a20) at __mp_lock+0x192 sys/kern/kern_lock.c:165 __mp_acquire_count(ffffffff83a09a20,1) 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(fffffd806d027030) at biowait+0xc6 sys/kern/vfs_bio.c:1242 bwrite(fffffd806d027030) at bwrite+0x2e7 sys/kern/vfs_bio.c:754 ufs_dirremove(fffffd806d929700,fffffd806c0e2e28,800c,1) at ufs_dirremove+0x290 sys/ufs/ufs/ufs_lookup.c:919 ufs_rmdir(ffff80002a3b4670) at ufs_rmdir+0x238 sys/ufs/ufs/ufs_vnops.c:1248 VOP_RMDIR(fffffd806d929700,fffffd805ea7b438,ffff80002a3b4748) at VOP_RMDIR+0x192 sys/kern/vfs_vops.c:413 dounlinkat(ffff80002a28ea78,ffffff9c,771b73e700f0,8) at dounlinkat+0x2e0 sys/kern/vfs_syscalls.c:1901 syscall(ffff80002a3b48c0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3b48c0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x771b73e700e0, count: 1 ddb{0}> trace x86_ipi_db(ffffffff8380fff0) 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(ffffffff83a09a20) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83a09a20) at __mp_lock+0x192 sys/kern/kern_lock.c:165 __mp_acquire_count(ffffffff83a09a20,1) 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(fffffd806d027030) at biowait+0xc6 sys/kern/vfs_bio.c:1242 bwrite(fffffd806d027030) at bwrite+0x2e7 sys/kern/vfs_bio.c:754 ufs_dirremove(fffffd806d929700,fffffd806c0e2e28,800c,1) at ufs_dirremove+0x290 sys/ufs/ufs/ufs_lookup.c:919 ufs_rmdir(ffff80002a3b4670) at ufs_rmdir+0x238 sys/ufs/ufs/ufs_vnops.c:1248 VOP_RMDIR(fffffd806d929700,fffffd805ea7b438,ffff80002a3b4748) at VOP_RMDIR+0x192 sys/kern/vfs_vops.c:413 dounlinkat(ffff80002a28ea78,ffffff9c,771b73e700f0,8) at dounlinkat+0x2e0 sys/kern/vfs_syscalls.c:1901 syscall(ffff80002a3b48c0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3b48c0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x771b73e700e0, count: -14 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x734264d03040, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x734264d03040, count: -1