kernel: protection fault trap, code=0 Stopped at sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace sys_semop(ffff8000ffff07d0,ffff80002a372b40,ffff80002a372a90) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80002a372b40) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a372b40) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7fc38e77de0, count: -3 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002a372a60 rbx 0 rdx 0 rcx 0xffff8000ffff07d0 rax 0xdead4110dead4110 r8 0x7f7fffffc000 r9 0 r10 0x8a074b5a5cad0369 r11 0xfd5d72c39cd20330 r12 0xffff800001495204 r13 0 r14 0xffff80002a372b40 r15 0 rip 0xffffffff824b5ecb sys_semop+0x45b cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a372940 ss 0x10 sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{0}> show proc PROC (syz-executor) tid=171628 pid=79965 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=86, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff0a60,0xffff8000ffff1740 process=0xffff80003c4d2f58 user=0xffff80002a36d000, vmspace=0xfffffd807eb8d960 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 60390 119179 39153 0 2 0 syz-executor 60390 353973 39153 0 3 0x4000080 fsleep syz-executor 44149 207813 65228 0 2 0 syz-executor 44149 170279 65228 0 3 0x4000080 fsleep syz-executor 44149 22942 65228 0 2 0x4000000 syz-executor 79965 54794 710 0 2 0 syz-executor *79965 171628 710 0 7 0x4000000 syz-executor 79965 141028 710 0 3 0x4000080 fsleep syz-executor 57350 191859 66086 0 2 0 syz-executor 57350 208176 66086 0 3 0x4000080 sbwait syz-executor 50776 310460 96833 0 3 0x80 nanoslp syz-executor 50776 4761 96833 0 3 0x4000080 kqread syz-executor 50776 139350 96833 0 3 0x4000080 fsleep syz-executor 39153 265982 65852 0 3 0x82 nanoslp syz-executor 96833 39731 65852 0 3 0x82 nanoslp syz-executor 710 195659 65852 0 3 0x82 nanoslp syz-executor 7156 144295 0 0 3 0x14280 nfsidl nfsio 43775 460865 0 0 3 0x14280 nfsidl nfsio 10885 422334 0 0 3 0x14280 nfsidl nfsio 77003 180841 0 0 3 0x14280 nfsidl nfsio 36356 231410 0 0 3 0x14280 nfsidl nfsio 44853 503377 0 0 3 0x14280 nfsidl nfsio 8279 410551 0 0 3 0x14280 nfsidl nfsio 29386 269356 0 0 3 0x14280 nfsidl nfsio 83282 76402 0 0 3 0x14280 nfsidl nfsio 42232 312229 0 0 3 0x14280 nfsidl nfsio 269 351431 0 0 3 0x14280 nfsidl nfsio 81718 318829 0 0 3 0x14280 nfsidl nfsio 25306 382329 0 0 3 0x14280 nfsidl nfsio 4060 46387 0 0 3 0x14280 nfsidl nfsio 40134 356309 0 0 3 0x14280 nfsidl nfsio 93040 170735 0 0 3 0x14280 nfsidl nfsio 65625 461714 0 0 3 0x14280 nfsidl nfsio 38835 393519 0 0 3 0x14280 nfsidl nfsio 56696 179852 0 0 3 0x14280 nfsidl nfsio 30485 341410 0 0 3 0x14280 nfsidl nfsio 96135 319195 0 0 3 0x14200 bored sosplice 21589 386770 65852 0 2 0x2 syz-executor 30800 327969 65852 0 7 0x2 syz-executor 65228 418600 65852 0 3 0x82 nanoslp syz-executor 66086 266441 65852 0 3 0x82 nanoslp syz-executor 62590 65252 65852 0 3 0x82 nanoslp syz-executor 65852 168015 62718 0 3 0x82 kqread syz-executor 62718 206179 19913 0 3 0x10008a sigsusp ksh 19913 474601 80367 0 3 0x98 kqread sshd-session 80367 172506 67928 0 3 0x92 kqread sshd-session 3980 246742 1 0 3 0x100083 ttyin getty 67928 371616 1 0 3 0x88 kqread sshd 58050 208847 83972 74 3 0x1100092 bpf pflogd 83972 138940 1 0 3 0x80 sbwait pflogd 15953 353566 41339 73 3 0x1100090 kqread syslogd 41339 289639 1 0 3 0x100082 sbwait syslogd 40800 81214 1 0 3 0x100080 kqread resolvd 5687 245428 83470 77 3 0x100092 kqread dhcpleased 31221 477893 83470 77 3 0x100092 kqread dhcpleased 83470 523404 1 0 3 0x80 kqread dhcpleased 77613 163393 0 0 3 0x14200 bored smr 5807 114230 0 0 2 0x14200 zerothread 76926 257919 0 0 3 0x14200 aiodoned aiodoned 89605 255918 0 0 3 0x14200 syncer update 97360 275885 0 0 3 0x14200 cleaner cleaner 15882 103302 0 0 3 0x14200 reaper reaper 19808 394294 0 0 3 0x14200 pgdaemon pagedaemon 84919 472429 0 0 3 0x14200 bored viomb 10222 290744 0 0 3 0x40014200 acpi0 acpi0 76166 486835 0 0 3 0x40014200 idle1 50124 242461 0 0 3 0x14200 bored softnet3 98682 71356 0 0 3 0x14200 bored softnet2 1964 469011 0 0 3 0x14200 bored softnet1 31808 391342 0 0 3 0x14200 bored softnet0 39952 281809 0 0 3 0x14200 bored systqmp 27390 249570 0 0 3 0x14200 bored systq 13323 461527 0 0 3 0x14200 tmoslp softclockmp 39585 370489 0 0 3 0x40014200 tmoslp softclock 41168 277113 0 0 3 0x40014200 idle0 1 50234 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 79965 (syz-executor) thread 0xffff8000ffff07d0 (171628) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83961eb8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 mi_switch+0x4b7 sys/kern/sched_bsd.c:441 #3 yield+0x6a sys/kern/sched_bsd.c:320 #4 malloc+0xe5 sys/kern/kern_malloc.c:174 #5 sys_semop+0x234 sys/kern/sysv_sem.c:564 #6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #7 Xsyscall+0x128 Process 21589 (syz-executor) thread 0xffff8000ffffd488 (386770) exclusive rwlock vmmaplk r = 0 (0xfffffd806ebcca68) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5250 #3 uvmspace_fork+0x44 sys/uvm/uvm_map.c:3811 #4 process_new+0x572 sys/kern/kern_fork.c:282 #5 fork1+0x3ea sys/kern/kern_fork.c:408 #6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #7 Xsyscall+0x128 Process 30800 (syz-executor) thread 0xffff8000ffffcf68 (327969) exclusive rrwlock inode r = 0 (0xfffffd806cccc560) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2bd sys/kern/vfs_subr.c:693 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1864 #13 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806cc86798) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1864 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10226 11265K 11366K 166960K 12360 0 pcb 17 13K 14K 166960K 200 0 rtable 231 9K 9K 166960K 498 0 pf 34 17K 81K 166960K 112 0 ifaddr 39 7K 8K 166960K 93 0 ifgroup 51 2K 2K 166960K 145 0 sysctl 3 1K 9K 166960K 10 0 counters 64 36K 37K 166960K 156 0 ioctlops 0 0K 4K 166960K 1622 0 iov 1 12K 16K 166960K 42 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1410 89K 89K 166960K 2051 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 15 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 25 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 110K 166960K 865 0 sigio 0 0K 0K 166960K 10 0 proc 73 91K 140K 166960K 684 0 subproc 72 4K 4K 166960K 99 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 138 0 in_multi 88 6K 7K 166960K 146 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 8 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 546 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 6 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 241 178K 192K 166960K 9359 0 UVM aobj 18 2K 2K 166960K 19 0 pinsyscall 42 84K 109K 166960K 2024 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 28 0 NDP 11 0K 2K 166960K 61 0 temp 57 8678K 8742K 166960K 28647 0 kqueue 14 22K 28K 166960K 154 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 72 0 67 1 0 1 1 0 8 0 rtentry 176 159 0 57 6 0 6 6 0 8 0 unpcb 144 587 0 566 6 2 4 4 0 8 3 syncache 336 5 0 5 3 2 1 1 0 8 1 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 808 133 0 128 3 2 1 2 0 8 0 arp 128 24 0 8 1 0 1 1 0 8 0 inpcb 384 650 0 641 5 3 2 5 0 8 0 nd6 144 37 0 14 2 1 1 2 0 8 0 pkpcb 40 14 0 14 1 0 1 1 0 8 1 kcovpl 48 11 0 3 1 0 1 1 0 8 0 ppxss 1192 31 0 31 3 2 1 1 0 8 1 pppxif 1504 8 0 8 3 2 1 1 0 8 1 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 4 0 3 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 52 0 14 1 0 1 1 0 8 0 pfstkey 128 53 0 15 2 0 2 2 0 8 0 pfstate 384 53 0 15 5 0 5 5 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 2 0 2 2 2 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 663 0 244 29 2 27 29 0 8 0 art_table 32 665 0 244 4 0 4 4 0 8 0 art_node 16 155 0 62 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 3 1 0 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 22 0 13 1 0 1 1 0 8 0 shmpl 112 16 0 1 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2861 0 1349 95 0 95 95 0 8 0 ffsino 288 2861 0 1349 109 0 109 109 0 8 0 nchpl 144 4044 0 2344 64 0 64 64 0 8 0 rtmask 32 7 0 7 3 2 1 1 0 8 1 uvmvnodes 80 3358 0 0 69 0 69 69 0 8 0 vnodes 216 3358 0 0 187 0 187 187 0 8 0 namei 1024 13469 0 13469 2 1 1 2 0 8 1 percpumem 16 93 0 46 1 0 1 1 0 8 0 kstatmem 264 80 0 56 2 0 2 2 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 2 0 2 2 2 0 1 0 8 0 scxspl 216 11920 0 11920 11 10 1 8 1 8 1 plimitpl 152 134 0 115 1 0 1 1 0 8 0 sigapl 424 1175 0 1105 9 0 9 9 0 8 0 knotepl 120 764 0 0 24 0 24 24 0 8 0 kqueuepl 224 235 0 225 2 1 1 2 0 8 0 pipepl 336 158 0 131 3 0 3 3 0 8 0 fdescpl 520 1134 0 1103 3 0 3 3 0 8 0 filepl 160 6172 0 5943 22 6 16 16 0 8 4 lockfpl 104 220 0 218 1 0 1 1 0 8 0 lockfspl 48 92 0 90 1 0 1 1 0 8 0 sessionpl 144 27 0 18 1 0 1 1 0 8 0 pgrppl 48 44 0 27 1 0 1 1 0 8 0 ucredpl 104 828 0 814 1 0 1 1 0 8 0 zombiepl 144 1153 0 1152 1 0 1 1 0 8 0 processpl 1208 1175 0 1105 6 0 6 6 0 8 0 procpl 656 2370 0 2292 8 0 8 8 0 8 0 srpgc 96 8 0 8 1 1 0 1 0 8 0 sosppl 168 6 0 6 2 1 1 1 0 8 1 sockpl 728 1331 0 1296 13 3 10 10 0 8 6 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 128 0 0 16 0 16 16 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 0 8 0 mtagpl 96 27 0 0 1 0 1 1 0 8 0 mbufpl 256 194 0 0 12 0 12 12 0 8 0 bufpl 280 3492 0 124 241 0 241 241 0 8 0 anonpl 32 10161 0 0 82 0 82 82 0 246 0 amapchunkpl 152 30537 0 30006 33 5 28 31 0 158 2 amappl16 200 3229 0 3164 24 18 6 15 0 8 0 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 120 0 108 1 0 1 1 0 8 0 amappl13 176 6 0 6 2 2 0 1 0 8 0 amappl12 168 1823 0 1793 4 1 3 3 0 8 0 amappl11 160 63 0 48 1 0 1 1 0 8 0 amappl10 152 10 0 10 1 1 0 1 0 8 0 amappl9 144 250 0 250 1 1 0 1 0 8 0 amappl8 136 18 0 15 1 0 1 1 0 8 0 amappl7 128 120 0 106 1 0 1 1 0 8 0 amappl6 120 208 0 205 1 0 1 1 0 8 0 amappl5 112 133 0 124 1 0 1 1 0 8 0 amappl4 104 325 0 305 1 0 1 1 0 8 0 amappl3 96 5983 0 5879 4 0 4 4 0 8 0 amappl2 88 702 0 638 2 0 2 2 0 8 0 amappl1 80 11744 0 11143 17 2 15 15 0 8 0 amappl 88 8488 0 8324 5 0 5 5 0 92 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 dma512 512 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 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 18 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1133 0 1103 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1133 0 1103 1 0 1 1 0 8 0 vmmpekpl 168 10296 0 10238 3 0 3 3 0 8 0 vmmpepl 168 76538 0 74558 103 4 99 102 0 357 2 vmsppl 480 1133 0 1103 6 1 5 5 0 8 0 rwobjpl 72 25155 0 20816 80 0 80 80 0 8 0 pdppl 4096 2273 0 2206 113 40 73 87 0 8 6 pvpl 32 18534 0 0 151 1 150 150 0 265 0 pmappl 256 1132 0 1103 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 404 0 50 11 0 11 11 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff8000ffff07d0,ffff80002a372b40,ffff80002a372a90) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80002a372b40) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a372b40) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7fc38e77de0, count: -3 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299ddff0) 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(ffffffff83961cb0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83961cb0) at __mp_lock+0x192 sys/kern/kern_lock.c:144 __mp_acquire_count(ffffffff83961cb0,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 mi_switch() at mi_switch+0x4b7 sys/kern/sched_bsd.c:441 sleep_finish(0,1) at sleep_finish+0x24f sys/kern/kern_synch.c:412 biowait(fffffd806c1a87c8) at biowait+0xc1 sys/kern/vfs_bio.c:1246 bwrite(fffffd806c1a87c8) at bwrite+0x2e5 sys/kern/vfs_bio.c:758 ufs_dirremove(fffffd806c541dc0,fffffd806cccc4c0,800c,1) at ufs_dirremove+0x2ac sys/ufs/ufs/ufs_lookup.c:919 ufs_rmdir(ffff80002a394ce8) at ufs_rmdir+0x287 sys/ufs/ufs/ufs_vnops.c:1248 VOP_RMDIR(fffffd806c541dc0,fffffd807ad73958,ffff80002a394dc8) at VOP_RMDIR+0x19a sys/kern/vfs_vops.c:413 dounlinkat(ffff8000ffffcf68,ffffff9c,7c45ee7107b0,8) at dounlinkat+0x2e0 sys/kern/vfs_syscalls.c:1897 syscall(ffff80002a394f40) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a394f40) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c45ee7107a0, count: -15