kernel: protection fault trap, code=0 Stopped at sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace sys_semop(ffff80003acd7c10,ffff80002a424130,ffff80002a424080) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80002a424130) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a424130) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x69c8a46a8f0, count: -3 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a424050 rbx 0 rdx 0 rcx 0xffff80003acd7c10 rax 0xdeaf4152deaf4152 r8 0x7f7fffffc000 r9 0x1 r10 0x8dad3bc05b8c84dd r11 0x57eb36725a0cbb20 r12 0xffff800000af2604 r13 0 r14 0xffff80002a424130 r15 0 rip 0xffffffff823dca6b sys_semop+0x45b cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a423f30 ss 0x10 sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{1}> show proc PROC (syz-executor) tid=406735 pid=8724 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003acd6a58,0xffff80003acd67e0 process=0xffff80003c4e46c0 user=0xffff80002a41f000, vmspace=0xfffffd805f6caca0 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 31658 520047 70730 0 7 0 syz-executor 31658 448676 70730 0 2 0x4000000 syz-executor 8724 445126 26686 0 2 0 syz-executor * 8724 406735 26686 0 7 0x4000000 syz-executor 8724 500660 26686 0 2 0x4000000 syz-executor 55901 320049 83278 0 2 0 syz-executor 55901 245818 83278 0 3 0x4000080 fsleep syz-executor 26366 365268 12821 0 2 0x40 syz-executor 20972 485774 11676 0 3 0x80 nanoslp syz-executor 20972 355823 11676 0 3 0x4000080 kqread syz-executor 20972 521870 11676 0 3 0x4000080 fsleep syz-executor 12821 304811 55217 0 3 0x82 ppwait syz-executor 26686 372678 55217 0 3 0x82 nanoslp syz-executor 26052 74131 55217 0 2 0x2 syz-executor 83278 496689 55217 0 3 0x82 nanoslp syz-executor 91702 491156 0 0 3 0x14280 nfsidl nfsio 31101 519825 0 0 3 0x14280 nfsidl nfsio 12168 405207 0 0 3 0x14280 nfsidl nfsio 14720 276702 0 0 3 0x14280 nfsidl nfsio 16150 272660 0 0 3 0x14280 nfsidl nfsio 92651 232107 0 0 3 0x14280 nfsidl nfsio 79510 21610 0 0 3 0x14280 nfsidl nfsio 98658 223453 0 0 3 0x14280 nfsidl nfsio 21254 423299 0 0 3 0x14280 nfsidl nfsio 70466 364160 0 0 3 0x14280 nfsidl nfsio 37573 483283 0 0 3 0x14280 nfsidl nfsio 71441 138701 0 0 3 0x14280 nfsidl nfsio 65000 335558 0 0 3 0x14280 nfsidl nfsio 34228 463664 0 0 3 0x14280 nfsidl nfsio 8127 4067 0 0 3 0x14280 nfsidl nfsio 12491 413650 0 0 3 0x14280 nfsidl nfsio 56929 185826 0 0 3 0x14280 nfsidl nfsio 37308 199861 0 0 3 0x14280 nfsidl nfsio 12544 297967 0 0 3 0x14280 nfsidl nfsio 97042 177245 0 0 3 0x14280 nfsidl nfsio 70590 13454 0 0 3 0x14200 bored sosplice 70730 311565 55217 0 3 0x82 nanoslp syz-executor 11676 253854 55217 0 3 0x82 nanoslp syz-executor 27204 273458 55217 0 2 0x2 syz-executor 91839 435487 55217 0 3 0x82 nanoslp syz-executor 55217 286906 61559 0 3 0x82 kqread syz-executor 61559 55368 18163 0 3 0x10008a sigsusp ksh 18163 76191 29394 0 3 0x98 kqread sshd-session 29394 471860 13606 0 3 0x92 kqread sshd-session 69446 305328 1 0 3 0x100083 ttyin getty 13606 161300 1 0 3 0x88 kqread sshd 71850 497761 78901 74 3 0x1100092 bpf pflogd 78901 229898 1 0 3 0x80 sbwait pflogd 87454 173331 82101 73 3 0x1100090 kqread syslogd 82101 504588 1 0 3 0x100082 sbwait syslogd 58441 339217 1 0 3 0x100080 kqread resolvd 18525 82865 17960 77 3 0x100092 kqread dhcpleased 87090 187819 17960 77 3 0x100092 kqread dhcpleased 17960 174079 1 0 3 0x80 kqread dhcpleased 86495 429878 0 0 3 0x14200 bored smr 1357 362005 0 0 2 0x14200 zerothread 24225 276165 0 0 3 0x14200 aiodoned aiodoned 35069 389477 0 0 3 0x14200 syncer update 32559 272584 0 0 3 0x14200 cleaner cleaner 51808 480195 0 0 3 0x14200 reaper reaper 14920 95898 0 0 3 0x14200 pgdaemon pagedaemon 57016 472204 0 0 3 0x14200 bored viomb 70239 507861 0 0 3 0x40014200 acpi0 acpi0 93312 514256 0 0 3 0x40014200 idle1 26030 439607 0 0 3 0x14200 bored softnet3 23650 109225 0 0 3 0x14200 bored softnet2 43729 22230 0 0 3 0x14200 bored softnet1 1797 520122 0 0 3 0x14200 bored softnet0 63604 440705 0 0 3 0x14200 bored systqmp 4894 14882 0 0 3 0x14200 bored systq 30096 274503 0 0 3 0x14200 tmoslp softclockmp 43545 305989 0 0 3 0x40014200 tmoslp softclock 59510 359135 0 0 3 0x40014200 idle0 1 52124 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 31658 (syz-executor) thread 0xffff80003acd67d0 (448676) exclusive rwlock vmmaplk r = 0 (0xfffffd805f6ca680) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #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 uvmfault_lookup+0xe8 sys/uvm/uvm_fault.c:1858 #4 uvm_fault_check+0x987 uvmfault_amapcopy sys/uvm/uvm_fault.c:235 [inline] #4 uvm_fault_check+0x987 sys/uvm/uvm_fault.c:774 #5 uvm_fault+0x106 sys/uvm/uvm_fault.c:668 #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 8724 (syz-executor) thread 0xffff80003acd7c10 (406735) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839ad518) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 __mp_acquire_count+0x58 #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:577 #7 Xsyscall+0x128 Process 8724 (syz-executor) thread 0xffff80003acd6038 (500660) exclusive rwlock futex r = 0 (0xffffffff838374a8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 sys_futex+0x69 sys/kern/sys_futex.c:98 #3 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #4 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10199 11032K 11416K 166960K 12225 0 pcb 17 14K 16K 166960K 252 0 rtable 128 6K 8K 166960K 511 0 pf 40 18K 21K 166960K 84 0 ifaddr 30 4K 7K 166960K 73 0 ifgroup 59 2K 2K 166960K 100 0 sysctl 4 1K 1K 166960K 4 0 counters 66 36K 37K 166960K 92 0 ioctlops 0 0K 4K 166960K 1525 0 iov 0 0K 16K 166960K 30 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1401 88K 88K 166960K 1777 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 10K 14K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 22 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 17 61K 89K 166960K 650 0 sigio 0 0K 0K 166960K 10 0 proc 72 91K 128K 166960K 671 0 subproc 72 4K 4K 166960K 108 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 69 0 in_multi 45 3K 7K 166960K 162 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 541 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 207 72K 86K 166960K 7460 0 UVM aobj 13 6K 6K 166960K 13 0 pinsyscall 42 84K 104K 166960K 1858 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 18 0 NDP 13 0K 2K 166960K 47 0 temp 48 8636K 8701K 166960K 22187 0 kqueue 14 22K 30K 166960K 88 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 120 143 0 75 3 0 3 3 0 8 0 rtentry 112 159 0 109 4 0 4 4 0 8 0 unpcb 144 286 0 269 2 0 2 2 0 8 1 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 808 278 0 274 17 11 6 10 0 8 5 arp 120 27 0 17 1 0 1 1 0 8 0 inpcb 376 848 0 776 22 13 9 15 0 8 1 nd6 136 37 0 27 1 0 1 1 0 8 0 kcovpl 48 12 0 4 1 0 1 1 0 8 0 ppxss 1168 4 0 4 1 0 1 1 0 8 1 pppxif 1472 1 0 1 1 1 0 1 0 8 0 pffrag 232 7 0 1 1 0 1 1 0 482 0 pffrnode 88 7 0 1 1 0 1 1 0 8 0 pffrent 40 11 0 5 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 0 1 0 1 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 50 0 9 1 0 1 1 0 8 0 pfstkey 128 53 0 12 2 0 2 2 0 8 0 pfstate 376 51 0 11 5 0 5 5 0 8 0 pfrule 1344 24 0 17 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 687 0 486 30 10 20 29 0 8 6 art_table 32 689 0 486 4 0 4 4 0 8 1 art_node 16 158 0 113 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 19 0 10 1 0 1 1 0 8 0 shmpl 112 10 0 0 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2368 0 855 95 0 95 95 0 8 0 ffsino 280 2368 0 855 109 0 109 109 0 8 0 nchpl 144 3185 0 1491 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 0 1 1 0 8 1 uvmvnodes 80 2745 0 0 57 0 57 57 0 8 0 vnodes 216 2745 0 0 153 0 153 153 0 8 0 namei 1024 11009 0 11008 6 5 1 4 0 8 0 percpumem 16 60 0 13 1 0 1 1 0 8 0 kstatmem 264 46 0 20 3 0 3 3 0 8 0 scsiplug 72 2 0 2 2 1 1 1 0 8 1 scxspl 216 9953 0 9953 10 2 8 8 1 8 8 plimitpl 152 182 0 165 1 0 1 1 0 8 0 sigapl 424 971 0 901 9 0 9 9 0 8 0 futexpl 64 6857 0 6854 1 0 1 1 0 8 0 knotepl 120 546 0 0 17 0 17 17 0 8 0 kqueuepl 216 132 0 121 1 0 1 1 0 8 0 pipepl 328 218 0 191 8 5 3 8 0 8 0 fdescpl 504 932 0 901 5 0 5 5 0 8 0 filepl 152 5052 0 4707 22 8 14 18 0 8 0 lockfpl 104 190 0 188 1 0 1 1 0 8 0 lockfspl 48 73 0 71 1 0 1 1 0 8 0 sessionpl 144 27 0 18 1 0 1 1 0 8 0 pgrppl 48 39 0 22 1 0 1 1 0 8 0 ucredpl 104 587 0 574 1 0 1 1 0 8 0 zombiepl 144 1110 0 1109 3 2 1 1 0 8 0 processpl 1168 971 0 901 6 0 6 6 0 8 0 procpl 648 1763 0 1687 8 0 8 8 0 8 0 srpgc 96 16 0 16 2 1 1 1 0 8 1 sosppl 168 7 0 7 3 2 1 1 0 8 1 sockpl 688 1285 0 1128 26 10 16 16 0 8 1 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 129 0 0 17 0 17 17 0 8 0 mcl2k 2048 44 0 0 5 0 5 5 0 8 0 mtagpl 96 13 0 0 1 0 1 1 0 8 0 mbufpl 256 5526 0 0 345 0 345 345 0 8 0 bufpl 280 3088 0 130 212 0 212 212 0 8 0 anonpl 24 137715 0 134408 37 3 34 35 0 184 8 amapchunkpl 152 23601 0 23166 34 8 26 27 0 158 5 amappl16 200 2201 0 2173 9 3 6 6 0 8 4 amappl15 192 1 0 1 1 1 0 1 0 8 0 amappl14 184 123 0 111 1 0 1 1 0 8 0 amappl13 176 8 0 7 1 0 1 1 0 8 0 amappl12 168 1717 0 1688 4 1 3 3 0 8 0 amappl11 160 47 0 33 1 0 1 1 0 8 0 amappl10 152 7 0 6 1 0 1 1 0 8 0 amappl9 144 250 0 250 1 1 0 1 0 8 0 amappl8 136 32 0 29 1 0 1 1 0 8 0 amappl7 128 116 0 104 1 0 1 1 0 8 0 amappl6 120 226 0 223 1 0 1 1 0 8 0 amappl5 112 136 0 127 1 0 1 1 0 8 0 amappl4 104 326 0 308 1 0 1 1 0 8 0 amappl3 96 4520 0 4420 5 1 4 4 0 8 0 amappl2 88 709 0 646 2 0 2 2 0 8 0 amappl1 80 9826 0 9253 14 0 14 14 0 8 0 amappl 88 7031 0 6879 5 0 5 5 0 92 0 dma8192 8192 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 6 0 6 1 1 0 1 0 8 0 dma128 128 254 0 254 2 1 1 1 0 8 1 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 72 12 0 0 1 0 1 1 0 8 0 uaddrrnd 24 931 0 901 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 931 0 901 1 0 1 1 0 8 0 vmmpekpl 168 9096 0 9040 3 0 3 3 0 8 0 vmmpepl 168 61654 0 59861 94 5 89 89 0 357 5 vmsppl 456 930 0 901 6 1 5 5 0 8 0 rwobjpl 64 21414 0 17741 61 0 61 61 0 8 1 pdppl 4096 1870 0 1802 112 38 74 86 0 8 6 pvpl 32 13215 0 0 107 0 107 107 0 265 0 pmappl 248 930 0 901 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 652 0 68 17 0 17 17 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff83797ff0) 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 end of kernel end trace frame: 0x76d7a4a60a70, count: -3 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{1}> trace sys_semop(ffff80003acd7c10,ffff80002a424130,ffff80002a424080) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80002a424130) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a424130) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x69c8a46a8f0, count: -3