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(ffff8000fffde550,ffff80003c436410,ffff80003c436360) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80003c436410) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c436410) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2dd324d3ff0, count: -3 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c436330 rbx 0 rdx 0 rcx 0xffff8000fffde550 rax 0xdeaf4152deaf4152 r8 0x7f7fffffc000 r9 0x1 r10 0xc337d6426b8193e r11 0xac05705f9e47cc53 r12 0xffff8000014bdd04 r13 0 r14 0xffff80003c436410 r15 0 rip 0xffffffff8207485b sys_semop+0x45b cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c436210 ss 0x10 sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{1}> show proc PROC (syz-executor) tid=343055 pid=94837 tcnt=4 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=0xffff8000fffde030,0xffff8000fffdea80 process=0xffff8000fffeb408 user=0xffff80003c431000, vmspace=0xfffffd806ef1d788 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 94837 179239 57528 0 2 0 syz-executor 94837 333877 57528 0 2 0x4000000 syz-executor *94837 343055 57528 0 7 0x4000000 syz-executor 94837 403449 57528 0 3 0x4000080 fsleep syz-executor 36006 145255 75602 0 2 0 syz-executor 36006 342978 75602 0 7 0x4000000 syz-executor 30722 249098 12514 0 2 0 syz-executor 30722 425811 12514 0 3 0x4000080 fsleep syz-executor 92270 411926 43570 0 2 0 syz-executor 92270 386344 43570 0 3 0x4000080 fsleep syz-executor 92270 255966 43570 0 3 0x4000080 fsleep syz-executor 7821 187306 51592 0 2 0 syz-executor 7821 270256 51592 0 3 0x4000080 fsleep syz-executor 7821 311236 51592 0 3 0x4000080 fsleep syz-executor 7821 17339 51592 0 3 0x4000080 fsleep syz-executor 61774 237891 90134 0 2 0 syz-executor 61774 65799 90134 0 3 0x4000080 fsleep syz-executor 61774 178453 90134 0 3 0x4000080 fsleep syz-executor 31501 27150 68452 0 2 0 syz-executor 31501 157648 68452 0 3 0x4000000 vmmaplk syz-executor 31501 524272 68452 0 2 0x4000000 syz-executor 35591 205754 22456 0 2 0 syz-executor 35591 80245 22456 0 3 0x4000080 fsleep syz-executor 35591 369047 22456 0 3 0x4000080 fsleep syz-executor 2939 124751 0 0 3 0x14280 nfsidl nfsio 58070 500446 0 0 3 0x14280 nfsidl nfsio 86913 320627 0 0 3 0x14280 nfsidl nfsio 3485 45343 0 0 3 0x14280 nfsidl nfsio 86122 95515 0 0 3 0x14280 nfsidl nfsio 72784 292598 0 0 3 0x14280 nfsidl nfsio 30323 124214 0 0 3 0x14280 nfsidl nfsio 48076 463231 0 0 3 0x14280 nfsidl nfsio 74217 464691 0 0 3 0x14280 nfsidl nfsio 52791 448750 0 0 3 0x14280 nfsidl nfsio 7701 2462 0 0 3 0x14280 nfsidl nfsio 21232 208095 0 0 3 0x14280 nfsidl nfsio 55434 71781 0 0 3 0x14280 nfsidl nfsio 52339 6757 0 0 3 0x14280 nfsidl nfsio 63033 329133 0 0 3 0x14280 nfsidl nfsio 20872 296198 0 0 3 0x14280 nfsidl nfsio 74625 487031 0 0 3 0x14280 nfsidl nfsio 94836 453296 0 0 3 0x14280 nfsidl nfsio 19495 396171 0 0 3 0x14280 nfsidl nfsio 90791 210169 0 0 3 0x14280 nfsidl nfsio 9247 104092 0 0 3 0x14200 bored sosplice 97844 208386 1 0 3 0x100083 ttyin getty 12514 330122 21317 0 3 0x82 nanoslp syz-executor 68452 491262 21317 0 3 0x82 nanoslp syz-executor 75602 237979 21317 0 3 0x82 nanoslp syz-executor 51592 190292 21317 0 2 0x3 syz-executor 57528 406202 21317 0 3 0x82 nanoslp syz-executor 90134 435239 21317 0 2 0x3 syz-executor 43570 377067 21317 0 3 0x82 nanoslp syz-executor 22456 294313 21317 0 3 0x82 nanoslp syz-executor 21317 484626 67206 0 3 0x82 kqread syz-executor 67206 410920 33991 0 3 0x10008a sigsusp ksh 33991 361659 41329 0 3 0x98 kqread sshd-session 41329 477597 36 0 3 0x92 kqread sshd-session 36 350514 1 0 3 0x88 kqread sshd 81502 66707 47365 74 3 0x1100092 bpf pflogd 47365 396220 1 0 3 0x80 sbwait pflogd 60942 113261 19153 73 3 0x1100090 kqread syslogd 19153 198752 1 0 3 0x100082 sbwait syslogd 78349 219454 1 0 3 0x100080 kqread resolvd 55737 449575 22318 77 3 0x100092 kqread dhcpleased 30734 137579 22318 77 3 0x100092 kqread dhcpleased 22318 419077 1 0 3 0x80 kqread dhcpleased 59525 118085 0 0 3 0x14200 bored smr 87782 140334 0 0 2 0x14200 zerothread 19255 412109 0 0 3 0x14200 aiodoned aiodoned 34422 273553 0 0 3 0x14200 syncer update 22077 212353 0 0 3 0x14200 cleaner cleaner 73190 310095 0 0 3 0x14200 reaper reaper 96305 227096 0 0 3 0x14200 pgdaemon pagedaemon 21779 117804 0 0 3 0x14200 bored viomb 26241 449452 0 0 3 0x40014200 acpi0 acpi0 41876 169759 0 0 3 0x40014200 idle1 79095 21307 0 0 3 0x14200 bored softnet3 33650 520120 0 0 3 0x14200 bored softnet2 19197 341371 0 0 3 0x14200 bored softnet1 32450 175931 0 0 3 0x14200 bored softnet0 69731 237579 0 0 3 0x14200 bored systqmp 42323 403416 0 0 3 0x14200 bored systq 56922 28675 0 0 3 0x14200 tmoslp softclockmp 45835 424646 0 0 3 0x40014200 tmoslp softclock 61787 484013 0 0 3 0x40014200 idle0 1 379186 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 94837 (syz-executor) thread 0xffff8000fffdf9d0 (179239) exclusive rwlock vmmaplk r = 0 (0xfffffd806ef1d888) #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+0x367 sys/kern/kern_rwlock.c:311 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5148 #3 uvm_map_protect+0xe1 sys/uvm/uvm_map.c:3057 #4 sys_mprotect+0x34c sys/uvm/uvm_mmap.c:590 #5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 #6 Xsyscall+0x128 Process 94837 (syz-executor) thread 0xffff8000fffde550 (343055) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8395e978) #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 31501 (syz-executor) thread 0xffff80002a2a5208 (524272) exclusive rwlock vmmaplk r = 0 (0xfffffd806c25c118) #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+0x367 sys/kern/kern_rwlock.c:311 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5148 #3 uvmfault_lookup+0xe8 sys/uvm/uvm_fault.c:1918 #4 uvm_fault_check+0x8a5 uvmfault_amapcopy sys/uvm/uvm_fault.c:235 [inline] #4 uvm_fault_check+0x8a5 sys/uvm/uvm_fault.c:784 #5 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #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 10209 11095K 11426K 166960K 12158 0 pcb 19 14K 16K 166960K 243 0 rtable 243 12K 13K 166960K 441 0 pf 34 17K 20K 166960K 96 0 ifaddr 42 7K 8K 166960K 79 0 ifgroup 55 2K 3K 166960K 129 0 sysctl 4 1K 9K 166960K 12 0 counters 68 36K 37K 166960K 138 0 ioctlops 0 0K 4K 166960K 1570 0 iov 0 0K 16K 166960K 80 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1344 85K 85K 166960K 1826 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 28 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 35 0 dirhash 15 2K 3K 166960K 33 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 904 0 sigio 0 0K 0K 166960K 12 0 proc 72 91K 128K 166960K 577 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 139 0 in_multi 94 6K 7K 166960K 125 0 ether_multi 2 0K 0K 166960K 3 0 mrt 2 0K 0K 166960K 5 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 396 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 252 161K 177K 166960K 9382 0 UVM aobj 34 2K 2K 166960K 34 0 pinsyscall 43 86K 104K 166960K 1986 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 39 0 NDP 12 0K 2K 166960K 48 0 temp 77 8680K 8791K 166960K 34351 0 kqueue 13 20K 28K 166960K 122 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 65 0 62 1 0 1 1 0 8 0 rtentry 176 130 0 22 6 0 6 6 0 8 0 unpcb 144 554 0 537 6 5 1 6 0 8 0 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 808 153 0 144 2 0 2 2 0 8 1 arp 128 21 0 1 1 0 1 1 0 8 0 inpcb 384 747 0 731 8 6 2 8 0 8 0 nd6 144 26 0 3 1 0 1 1 0 8 0 pkpcb 40 8 0 8 2 1 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 22 0 22 2 1 1 1 0 8 1 pppxif 1504 10 0 10 3 2 1 1 0 8 1 pffrag 232 13 0 2 1 0 1 1 0 482 0 pffrnode 88 13 0 2 1 0 1 1 0 8 0 pffrent 40 17 0 6 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 50 0 16 1 0 1 1 0 8 0 pfstkey 128 50 0 16 2 0 2 2 0 8 0 pfstate 384 50 0 16 5 0 5 5 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 492 0 55 29 0 29 29 0 8 0 art_table 32 494 0 55 4 0 4 4 0 8 0 art_node 16 124 0 26 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 1 1 0 1 1 0 8 0 semupl 112 2 0 2 2 1 1 1 0 8 1 semapl 112 14 0 5 1 0 1 1 0 8 0 shmpl 112 31 0 0 1 0 1 1 0 8 0 dirhash 1024 32 0 13 3 0 3 3 0 8 0 dino2pl 256 2786 0 1273 96 0 96 96 0 8 0 ffsino 288 2786 0 1273 110 0 110 110 0 8 0 nchpl 144 3955 0 2263 64 0 64 64 0 8 0 rtmask 32 5 0 5 2 1 1 1 0 8 1 uvmvnodes 80 2803 0 0 58 0 58 58 0 8 0 vnodes 216 2803 0 0 156 0 156 156 0 8 0 namei 1024 12045 0 12045 4 3 1 2 0 8 1 percpumem 16 84 0 35 1 0 1 1 0 8 0 kstatmem 264 66 0 40 5 2 3 3 0 8 1 scsiplug 72 4 0 4 2 2 0 1 0 8 0 scxspl 216 12725 0 12725 11 3 8 8 1 8 8 plimitpl 152 131 0 113 1 0 1 1 0 8 0 sigapl 424 1224 0 1153 9 1 8 8 0 8 0 knotepl 120 512 0 0 16 0 16 16 0 8 0 kqueuepl 224 296 0 287 5 4 1 5 0 8 0 pipepl 336 188 0 161 8 5 3 8 0 8 0 fdescpl 520 1185 0 1153 3 0 3 3 0 8 0 filepl 160 5445 0 5222 22 11 11 16 0 8 1 lockfpl 104 102 0 100 1 0 1 1 0 8 0 lockfspl 48 45 0 43 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 31 0 14 1 0 1 1 0 8 0 ucredpl 104 429 0 416 1 0 1 1 0 8 0 zombiepl 144 1238 0 1238 1 0 1 1 0 8 1 processpl 1208 1224 0 1153 6 0 6 6 0 8 0 procpl 656 2273 0 2186 8 0 8 8 0 8 0 sosppl 168 2 0 2 1 0 1 1 0 8 1 sockpl 728 1384 0 1349 23 18 5 15 0 8 1 mcl64k 65536 12 0 0 2 0 2 2 0 8 0 mcl16k 16384 7 0 0 1 0 1 1 0 8 0 mcl12k 12288 7 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 18 0 0 3 0 3 3 0 8 0 mcl4k 4096 112 0 0 14 0 14 14 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 0 8 0 mtagpl 96 96 0 0 3 0 3 3 0 8 0 mbufpl 256 289 0 0 19 0 19 19 0 8 0 bufpl 280 3867 0 124 268 0 268 268 0 8 0 anonpl 32 5751 0 0 47 0 47 47 0 246 0 amapchunkpl 152 30068 0 29525 33 9 24 26 0 158 3 amappl16 200 2137 0 2090 6 3 3 4 0 8 0 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 115 0 103 1 0 1 1 0 8 0 amappl13 176 3 0 3 1 1 0 1 0 8 0 amappl12 168 1823 0 1791 3 1 2 2 0 8 0 amappl11 160 50 0 36 1 0 1 1 0 8 0 amappl10 152 27 0 27 1 1 0 1 0 8 0 amappl9 144 258 0 257 1 0 1 1 0 8 0 amappl8 136 21 0 18 1 0 1 1 0 8 0 amappl7 128 109 0 97 1 0 1 1 0 8 0 amappl6 120 180 0 177 1 0 1 1 0 8 0 amappl5 112 125 0 115 1 0 1 1 0 8 0 amappl4 104 311 0 291 1 0 1 1 0 8 0 amappl3 96 6278 0 6154 6 2 4 4 0 8 0 amappl2 88 630 0 566 2 0 2 2 0 8 0 amappl1 80 11405 0 10794 14 1 13 14 0 8 0 amappl 88 8588 0 8409 5 0 5 5 0 92 1 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 1 0 1 1 0 1 1 0 8 1 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 128 253 0 253 1 1 0 1 0 8 0 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 33 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1185 0 1153 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1185 0 1153 1 0 1 1 0 8 0 vmmpekpl 168 10224 0 10188 3 0 3 3 0 8 0 vmmpepl 168 76653 0 74568 93 2 91 91 0 357 0 vmsppl 480 1184 0 1153 5 1 4 5 0 8 0 rwobjpl 72 22778 0 18966 70 0 70 70 0 8 0 pdppl 4096 2378 0 2306 106 34 72 86 0 8 0 pvpl 32 13054 0 0 107 1 106 107 0 265 0 pmappl 256 1184 0 1153 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 412 0 46 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff837f4ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x1a kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x1a sys/dev/kcov.c:153 __mp_lock(ffffffff8395e770) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:128 [inline] __mp_lock(ffffffff8395e770) at __mp_lock+0x1a3 sys/kern/kern_lock.c:159 doopenat(ffff8000fffded00,ffffff9c,200000000700,0,0,ffff80003c4dec90) at doopenat+0x314 sys/kern/vfs_syscalls.c:1137 syscall(ffff80003c4ded40) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4ded40) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8c223ed3d20, count: -8 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{1}> trace sys_semop(ffff8000fffde550,ffff80003c436410,ffff80003c436360) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80003c436410) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c436410) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2dd324d3ff0, count: -3