uvm_fault(0xffffffff836190a8, 0xffff8000137e2004, 0, 1) -> d kernel: page fault trap, code=0 Stopped at ufs_lookup+0x5e1: movzwl 0x4(%r15,%rbx,1),%r14d TID PID UID PRFLAGS PFLAGS CPU COMMAND *256913 97786 0 0 0 1K syz-executor 446688 59550 0 0 0 0 syz-executor ufs_lookup() at ufs_lookup+0x5e1 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffd80776d2700,ffff800036bb5958,ffff800036bb5988) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff800036bb5928) at vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 namei(ffff800036bb5928) at namei+0x7aa sys/kern/vfs_lookup.c:250 sys_chdir(ffff8000ffff67b8,ffff800036bb5b00,ffff800036bb5a50) at sys_chdir+0x88 change_dir sys/kern/vfs_syscalls.c:839 [inline] sys_chdir(ffff8000ffff67b8,ffff800036bb5b00,ffff800036bb5a50) at sys_chdir+0x88 sys/kern/vfs_syscalls.c:785 syscall(ffff800036bb5b00) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff800036bb5b00) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d4384275490, count: 8 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(0xffffffff836190a8, 0xffff8000137e2004, 0, 1) -> d ddb{1}> trace ufs_lookup() at ufs_lookup+0x5e1 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffd80776d2700,ffff800036bb5958,ffff800036bb5988) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff800036bb5928) at vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 namei(ffff800036bb5928) at namei+0x7aa sys/kern/vfs_lookup.c:250 sys_chdir(ffff8000ffff67b8,ffff800036bb5b00,ffff800036bb5a50) at sys_chdir+0x88 change_dir sys/kern/vfs_syscalls.c:839 [inline] sys_chdir(ffff8000ffff67b8,ffff800036bb5b00,ffff800036bb5a50) at sys_chdir+0x88 sys/kern/vfs_syscalls.c:785 syscall(ffff800036bb5b00) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff800036bb5b00) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d4384275490, count: -7 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff800036bb5770 rbx 0 rdx 0 rcx 0xffffffff rax 0xfffffd80609cc7c0 r8 0xffffffffffffffff r9 0xfffffd807f7d3478 r10 0x97e6e970381f8ef8 r11 0x78c969ccc2454e64 r12 0 r13 0xfffffd806e0baee8 r14 0 r15 0xffff8000137e2000 rip 0xffffffff821da6c1 ufs_lookup+0x5e1 cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff800036bb5660 ss 0x10 ufs_lookup+0x5e1: movzwl 0x4(%r15,%rbx,1),%r14d ddb{1}> show proc PROC (syz-executor) tid=256913 pid=97786 tcnt=1 stat=onproc flags process=0 proc=0 runpri=50, usrpri=86, slppri=16, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000371ea030,0xffffffff834fd8e0 process=0xffff8000371b28e8 user=0xffff800036bb0000, vmspace=0xfffffd806bf9c1b8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *97786 256913 86119 0 7 0 syz-executor 6204 379470 3333 0 2 0 syz-executor 6204 10244 3333 0 3 0x4000000 vmmaplk syz-executor 99703 459388 33722 0 2 0 syz-executor 99703 178024 33722 0 3 0x4000080 fsleep syz-executor 31614 363652 25246 0 2 0x2 ifconfig 91057 260032 74355 0 2 0x100002 sh 25246 371140 65975 0 3 0x10008a sigsusp sh 59550 446688 21820 0 7 0 syz-executor 59550 170325 21820 0 3 0x4000080 fsleep syz-executor 59550 198494 21820 0 3 0x4000080 fsleep syz-executor 78002 31157 9865 0 3 0 vmmaplk syz-executor 78002 164133 9865 0 3 0x4000080 fsleep syz-executor 78002 115750 9865 0 3 0x4000080 fsleep syz-executor 78002 330029 9865 0 2 0x4000000 syz-executor 29025 422598 92661 0 2 0 syz-executor 29025 483593 92661 0 3 0x4000080 fsleep syz-executor 29025 113289 92661 0 2 0x4000000 syz-executor 29025 67627 92661 0 2 0x4000000 syz-executor 65975 257727 13627 0 3 0x82 wait syz-executor 74355 91726 13627 0 3 0x82 wait syz-executor 33722 206528 13627 0 3 0x82 nanoslp syz-executor 9865 506025 13627 0 3 0x82 nanoslp syz-executor 86119 391251 13627 0 3 0x82 nanoslp syz-executor 3333 43238 13627 0 3 0x82 nanoslp syz-executor 92661 514759 13627 0 3 0x82 nanoslp syz-executor 21820 366113 13627 0 3 0x82 nanoslp syz-executor 51462 42347 1 0 3 0x100083 ttyin getty 42572 439079 0 0 3 0x14200 bored sosplice 13627 158224 32608 0 3 0x82 kqread syz-executor 32608 476542 27979 0 3 0x10008a sigsusp ksh 27979 451051 51781 0 3 0x98 kqread sshd-session 51781 506459 73870 0 3 0x92 kqread sshd-session 73870 294765 1 0 3 0x88 kqread sshd 62139 244953 52667 74 3 0x1100092 bpf pflogd 52667 50083 1 0 3 0x80 sbwait pflogd 11585 92391 11307 73 3 0x1100090 kqread syslogd 11307 196627 1 0 3 0x100082 sbwait syslogd 94485 469566 1 0 3 0x100080 kqread resolvd 66131 168353 6552 77 3 0x100092 kqread dhcpleased 27456 511921 6552 77 3 0x100092 kqread dhcpleased 6552 186466 1 0 3 0x80 kqread dhcpleased 17852 243863 0 0 3 0x14200 bored smr 20814 318278 0 0 2 0x14200 zerothread 29703 214311 0 0 3 0x14200 aiodoned aiodoned 93485 273599 0 0 3 0x14200 syncer update 13398 254777 0 0 3 0x14200 cleaner cleaner 62863 422899 0 0 3 0x14200 reaper reaper 80743 449760 0 0 3 0x14200 pgdaemon pagedaemon 19326 367547 0 0 3 0x14200 bored viomb 95993 254713 0 0 3 0x40014200 acpi0 acpi0 39357 434672 0 0 3 0x40014200 idle1 64397 65267 0 0 3 0x14200 bored softnet3 13625 408870 0 0 3 0x14200 bored softnet2 12561 423783 0 0 3 0x14200 bored softnet1 68501 229359 0 0 3 0x14200 bored softnet0 50662 359120 0 0 3 0x14200 bored systqmp 85031 250551 0 0 3 0x14200 bored systq 64499 48932 0 0 3 0x14200 tmoslp softclockmp 28683 410335 0 0 3 0x40014200 tmoslp softclock 11586 396856 0 0 3 0x40014200 idle0 1 446076 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 97786 (syz-executor) thread 0xffff8000ffff67b8 (256913) exclusive rrwlock inode r = 0 (0xfffffd806e0baf80) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 sys_chdir+0x88 change_dir sys/kern/vfs_syscalls.c:839 [inline] #7 sys_chdir+0x88 sys/kern/vfs_syscalls.c:785 #8 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #8 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8362f4e0) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 __mp_acquire_count+0x58 #2 mi_switch+0x658 sys/kern/sched_bsd.c:460 #3 yield+0x6a sys/kern/sched_bsd.c:320 #4 pool_get+0x242 sys/kern/subr_pool.c:589 #5 namei+0xdf sys/kern/vfs_lookup.c:145 #6 sys_chdir+0x88 change_dir sys/kern/vfs_syscalls.c:839 [inline] #6 sys_chdir+0x88 sys/kern/vfs_syscalls.c:785 #7 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #7 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #8 Xsyscall+0x128 Process 6204 (syz-executor) thread 0xffff8000ffff6f50 (379470) exclusive rwlock vmmaplk r = 0 (0xfffffd806bf9c460) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 vm_map_lock_ln+0x143 sys/uvm/uvm_map.c:5252 #3 uvmfault_lookup+0xe8 sys/uvm/uvm_fault.c:1779 #4 uvm_fault_check+0x83e uvmfault_amapcopy sys/uvm/uvm_fault.c:236 [inline] #4 uvm_fault_check+0x83e sys/uvm/uvm_fault.c:710 #5 uvm_fault+0x112 sys/uvm/uvm_fault.c:600 #6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #7 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #8 recall_trap+0x8 Process 59550 (syz-executor) thread 0xffff8000ffff7460 (446688) shared rwlock vmmaplk r = 0 (0xfffffd806bf9c0f0) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1785 #2 uvm_fault_check+0x47 sys/uvm/uvm_fault.c:672 #3 uvm_fault+0x112 sys/uvm/uvm_fault.c:600 #4 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #5 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #6 recall_trap+0x8 Process 78002 (syz-executor) thread 0xffff8000ffff6cc8 (330029) exclusive rwlock vmmaplk r = 0 (0xfffffd807ec787d0) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 vm_map_lock_ln+0x143 sys/uvm/uvm_map.c:5252 #3 uvmfault_lookup+0xe8 sys/uvm/uvm_fault.c:1779 #4 uvm_fault_check+0x83e uvmfault_amapcopy sys/uvm/uvm_fault.c:236 [inline] #4 uvm_fault_check+0x83e sys/uvm/uvm_fault.c:710 #5 uvm_fault+0x112 sys/uvm/uvm_fault.c:600 #6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #7 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #8 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10200 10120K 10493K 166960K 12706 0 pcb 17 14K 16K 166960K 228 0 rtable 205 9K 10K 166960K 2013 0 pf 38 18K 20K 166960K 182 0 ifaddr 38 7K 8K 166960K 269 0 ifgroup 60 2K 2K 166960K 288 0 sysctl 4 1K 1K 166960K 4 0 counters 66 36K 37K 166960K 186 0 ioctlops 0 0K 4K 166960K 1801 0 iov 0 0K 32K 166960K 130 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1412 89K 89K 166960K 2733 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 10K 14K 166960K 18 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 27 0 dirhash 12 2K 2K 166960K 48 0 ACPI 1690 195K 286K 166960K 12418 0 file desc 19 69K 97K 166960K 1810 0 sigio 0 0K 0K 166960K 23 0 proc 75 103K 128K 166960K 2099 0 subproc 104 6K 7K 166960K 819 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 236 0 in_multi 77 5K 7K 166960K 690 0 ether_multi 1 0K 0K 166960K 9 0 mrt 1 0K 0K 166960K 10 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 1188 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 236 73K 92K 166960K 15412 0 UVM aobj 37 4K 4K 166960K 42 0 pinsyscall 44 88K 108K 166960K 4249 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 48 0 NDP 19 0K 2K 166960K 193 0 temp 75 6824K 7075K 166960K 67593 0 kqueue 14 22K 34K 166960K 159 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 196 0 193 1 0 1 1 0 8 0 rtentry 112 713 0 624 6 2 4 4 0 8 1 unpcb 144 633 0 614 7 6 1 4 0 8 0 syncache 336 8 0 8 5 5 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 808 269 0 264 5 4 1 4 0 8 0 arp 120 127 0 112 1 0 1 1 0 8 0 inpcb 336 1394 0 1384 17 13 4 6 0 8 3 nd6 136 188 0 170 1 0 1 1 0 8 0 pkpcb 40 6 0 6 4 4 0 1 0 8 0 kcovpl 48 63 0 55 1 0 1 1 0 8 0 ppxss 1168 6 0 6 2 2 0 1 0 8 0 pfstscr 40 2 0 2 2 2 0 1 0 8 0 pffrag 232 8 0 7 1 0 1 1 0 482 0 pffrnode 88 8 0 7 1 0 1 1 0 8 0 pffrent 40 53 0 52 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 pfstitem 24 143 0 110 1 0 1 1 0 8 0 pfstkey 128 147 0 114 2 0 2 2 0 8 0 pfstate 376 144 0 112 5 0 5 5 0 8 0 pfrule 1344 27 0 22 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 2815 0 2445 38 9 29 30 0 8 4 art_table 32 2817 0 2445 4 0 4 4 0 8 0 art_node 16 711 0 630 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 1 1 0 1 1 0 8 0 semapl 112 25 0 15 1 0 1 1 0 8 0 shmpl 112 39 0 5 1 0 1 1 0 8 0 dirhash 1024 42 0 25 3 0 3 3 0 8 0 dino2pl 256 3216 0 1605 101 0 101 101 0 8 0 ffsino 272 3216 0 1605 108 0 108 108 0 8 0 nchpl 144 4714 0 2953 66 0 66 66 0 8 0 uvmvnodes 80 4447 0 0 91 0 91 91 0 8 0 vnodes 216 4447 0 0 248 0 248 248 0 8 0 namei 1024 20879 0 20876 4 3 1 2 0 8 0 percpumem 16 107 0 60 1 0 1 1 0 8 0 kstatmem 264 146 0 120 3 0 3 3 0 8 0 scsiplug 72 2 0 2 2 2 0 1 0 8 0 scxspl 216 40132 0 40132 14 13 1 8 1 8 1 plimitpl 152 382 0 365 1 0 1 1 0 8 0 sigapl 424 2005 0 1953 9 2 7 7 0 8 1 futexpl 64 14010 0 14004 3 2 1 1 0 8 0 knotepl 120 663 0 0 17 0 17 17 0 8 0 kqueuepl 216 375 0 365 6 5 1 5 0 8 0 pipepl 320 581 0 554 20 17 3 8 0 8 0 fdescpl 496 1986 0 1953 7 2 5 6 0 8 0 filepl 152 10059 0 9813 27 16 11 17 0 8 1 lockfpl 104 343 0 340 1 0 1 1 0 8 0 lockfspl 48 147 0 144 1 0 1 1 0 8 0 sessionpl 144 80 0 71 1 0 1 1 0 8 0 pgrppl 48 147 0 130 1 0 1 1 0 8 0 ucredpl 104 1824 0 1811 1 0 1 1 0 8 0 zombiepl 144 2215 0 2215 1 0 1 1 0 8 1 processpl 1160 2006 0 1953 5 1 4 5 0 8 0 procpl 648 3548 0 3485 8 2 6 7 0 8 0 srpgc 96 6 0 6 1 1 0 1 0 8 0 sosppl 168 10 0 10 5 5 0 1 0 8 0 sockpl 664 2245 0 2213 21 15 6 9 0 8 3 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 6 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 233 0 0 30 1 29 30 0 8 0 mtagpl 96 42 0 0 2 0 2 2 0 8 0 mbufpl 256 1147 0 0 68 0 68 68 0 8 0 bufpl 280 8704 0 1944 484 0 484 484 0 8 0 anonpl 24 373356 0 365265 149 60 89 89 0 185 16 amapchunkpl 152 50161 0 49615 57 23 34 39 0 158 10 amappl16 200 8390 0 8167 62 34 28 29 0 8 3 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 226 0 214 1 0 1 1 0 8 0 amappl13 176 16 0 16 1 1 0 1 0 8 0 amappl12 168 3468 0 3435 3 1 2 2 0 8 0 amappl11 160 72 0 58 1 0 1 1 0 8 0 amappl10 152 11 0 11 1 1 0 1 0 8 0 amappl9 144 138 0 138 1 1 0 1 0 8 0 amappl8 136 24 0 21 1 0 1 1 0 8 0 amappl7 128 219 0 206 1 0 1 1 0 8 0 amappl6 120 681 0 677 1 0 1 1 0 8 0 amappl5 112 347 0 333 1 0 1 1 0 8 0 amappl4 104 481 0 462 1 0 1 1 0 8 0 amappl3 96 9525 0 9418 5 1 4 4 0 8 0 amappl2 88 1443 0 1371 2 0 2 2 0 8 0 amappl1 80 16370 0 15799 15 2 13 14 0 8 0 amappl 88 14559 0 14385 6 1 5 5 0 92 0 dma65536 65536 2 0 2 2 2 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 128 254 0 254 2 2 0 1 0 8 0 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 41 0 5 1 0 1 1 0 8 0 uaddrrnd 24 1986 0 1953 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1986 0 1953 1 0 1 1 0 8 0 vmmpekpl 168 18288 0 18238 5 1 4 4 0 8 0 vmmpepl 168 131972 0 129917 133 26 107 107 0 357 3 vmsppl 440 1985 0 1953 6 2 4 5 0 8 0 rwobjpl 56 44404 0 38766 83 1 82 82 0 8 0 pdppl 4096 3979 0 3906 188 115 73 87 0 8 0 pvpl 32 34550 0 0 277 0 277 277 0 265 0 pmappl 248 1985 0 1953 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 580 0 156 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83466ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 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(ffffffff8362f2d8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8362f2d8) at __mp_lock+0x192 sys/kern/kern_lock.c:144 uvm_fault(fffffd806bf9c000,76887c8e000,0,1) at uvm_fault+0x1ed sys/uvm/uvm_fault.c:622 upageflttrap(ffff80002a160dc0,76887c8e000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80002a160dc0) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x779871252630, count: 7 ddb{0}> trace x86_ipi_db(ffffffff83466ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 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(ffffffff8362f2d8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8362f2d8) at __mp_lock+0x192 sys/kern/kern_lock.c:144 uvm_fault(fffffd806bf9c000,76887c8e000,0,1) at uvm_fault+0x1ed sys/uvm/uvm_fault.c:622 upageflttrap(ffff80002a160dc0,76887c8e000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80002a160dc0) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x779871252630, count: -8 ddb{0}> machine ddbcpu 1 Stopped at ufs_lookup+0x5e1: movzwl 0x4(%r15,%rbx,1),%r14d ufs_lookup() at ufs_lookup+0x5e1 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffd80776d2700,ffff800036bb5958,ffff800036bb5988) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff800036bb5928) at vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 namei(ffff800036bb5928) at namei+0x7aa sys/kern/vfs_lookup.c:250 sys_chdir(ffff8000ffff67b8,ffff800036bb5b00,ffff800036bb5a50) at sys_chdir+0x88 change_dir sys/kern/vfs_syscalls.c:839 [inline] sys_chdir(ffff8000ffff67b8,ffff800036bb5b00,ffff800036bb5a50) at sys_chdir+0x88 sys/kern/vfs_syscalls.c:785 syscall(ffff800036bb5b00) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff800036bb5b00) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d4384275490, count: 8 ddb{1}> trace ufs_lookup() at ufs_lookup+0x5e1 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffd80776d2700,ffff800036bb5958,ffff800036bb5988) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff800036bb5928) at vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 namei(ffff800036bb5928) at namei+0x7aa sys/kern/vfs_lookup.c:250 sys_chdir(ffff8000ffff67b8,ffff800036bb5b00,ffff800036bb5a50) at sys_chdir+0x88 change_dir sys/kern/vfs_syscalls.c:839 [inline] sys_chdir(ffff8000ffff67b8,ffff800036bb5b00,ffff800036bb5a50) at sys_chdir+0x88 sys/kern/vfs_syscalls.c:785 syscall(ffff800036bb5b00) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff800036bb5b00) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d4384275490, count: -7