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(ffff80003c5a07c8,ffff80003c658e80,ffff80003c658dd0) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80003c658e80) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c658e80) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe8c709e1480, count: -3 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003c658da0 rbx 0 rdx 0 rcx 0xffff80003c5a07c8 rax 0xdeadbeefdeadbeef r8 0x7f7fffffc000 r9 0 r10 0x9db97f4859e28149 r11 0x647b4b6701448a32 r12 0xffff800001379a04 r13 0 r14 0xffff80003c658e80 r15 0 rip 0xffffffff81f3af1b sys_semop+0x45b cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c658c80 ss 0x10 sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{0}> show proc PROC (syz-executor) tid=33224 pid=68457 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=84, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c5a02b8,0xffff80003c5a0ce8 process=0xffff80003c5bf008 user=0xffff80003c653000, vmspace=0xfffffd805dca1ad8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 47485 323386 67722 0 7 0 syz-executor 47485 28695 67722 0 2 0x4000000 syz-executor 60483 283040 93226 0 2 0 syz-executor 52782 21222 60382 0 2 0 syz-executor 52782 115063 60382 0 2 0x4000000 syz-executor 40366 381458 30771 0 2 0 syz-executor 40366 180343 30771 0 3 0x4000080 fsleep syz-executor 40366 280555 30771 0 2 0x4000000 syz-executor 17573 349019 46312 0 2 0 syz-executor 17573 313888 46312 0 2 0x4000000 syz-executor 17573 115374 46312 0 2 0x4000000 syz-executor 17573 294042 46312 0 3 0x4000080 fsleep syz-executor 68457 250054 55378 0 2 0 syz-executor 68457 16041 55378 0 2 0x4000000 syz-executor *68457 33224 55378 0 7 0x4000000 syz-executor 42324 321997 18247 0 2 0 syz-executor 42324 71109 18247 0 2 0x4000000 syz-executor 58600 401855 0 0 3 0x14200 acct acct 30771 196752 79340 0 3 0x82 nanoslp syz-executor 48412 202088 1 0 3 0x80 nanoslp init 18247 217414 79340 0 2 0x3 syz-executor 73962 457086 0 0 3 0x14280 nfsidl nfsio 52030 220849 0 0 3 0x14280 nfsidl nfsio 37248 159183 0 0 3 0x14280 nfsidl nfsio 4050 277993 0 0 3 0x14280 nfsidl nfsio 78500 410546 0 0 3 0x14280 nfsidl nfsio 74169 252490 0 0 3 0x14280 nfsidl nfsio 5785 347576 0 0 3 0x14280 nfsidl nfsio 6305 267234 0 0 3 0x14280 nfsidl nfsio 6392 115368 0 0 3 0x14280 nfsidl nfsio 45759 351245 0 0 3 0x14280 nfsidl nfsio 50949 402176 0 0 3 0x14280 nfsidl nfsio 3742 86979 0 0 3 0x14280 nfsidl nfsio 34384 519289 0 0 3 0x14280 nfsidl nfsio 14031 86592 0 0 3 0x14280 nfsidl nfsio 8590 94591 0 0 3 0x14280 nfsidl nfsio 43913 134371 0 0 3 0x14280 nfsidl nfsio 84190 33157 0 0 3 0x14280 nfsidl nfsio 23405 152259 0 0 3 0x14280 nfsidl nfsio 75921 155946 0 0 3 0x14280 nfsidl nfsio 59464 146951 0 0 3 0x14280 nfsidl nfsio 4555 72025 0 0 3 0x14200 bored sosplice 60382 472676 79340 0 3 0x82 nanoslp syz-executor 93226 346227 79340 0 2 0x3 syz-executor 46312 375737 79340 0 2 0x3 syz-executor 55378 56336 79340 0 2 0x3 syz-executor 47051 47831 79340 0 3 0x82 wait syz-executor 67722 272830 79340 0 3 0x82 nanoslp syz-executor 79340 214441 99578 0 3 0x82 kqread syz-executor 99578 161221 97742 0 3 0x10008a sigsusp ksh 97742 9705 80485 0 3 0x98 kqread sshd-session 80485 65393 9322 0 3 0x92 kqread sshd-session 9322 243788 1 0 3 0x88 kqread sshd 21875 328989 25845 74 3 0x1100092 bpf pflogd 25845 207079 1 0 3 0x80 sbwait pflogd 56012 199037 63050 73 3 0x1100090 kqread syslogd 63050 208559 1 0 3 0x100082 sbwait syslogd 30926 401651 1 0 3 0x100080 kqread resolvd 11064 259038 51818 77 3 0x100092 kqread dhcpleased 88721 512334 51818 77 3 0x100092 kqread dhcpleased 51818 35240 1 0 3 0x80 kqread dhcpleased 50968 253822 0 0 3 0x14200 bored smr 81439 278713 0 0 3 0x14200 pgzero zerothread 11954 511377 0 0 3 0x14200 aiodoned aiodoned 53318 424239 0 0 3 0x14200 syncer update 72840 236728 0 0 3 0x14200 cleaner cleaner 29099 107553 0 0 3 0x14200 reaper reaper 64406 370141 0 0 3 0x14200 pgdaemon pagedaemon 40788 212000 0 0 3 0x14200 bored viomb 90279 154597 0 0 3 0x40014200 acpi0 acpi0 41351 217200 0 0 3 0x40014200 idle1 16529 24745 0 0 3 0x14200 bored softnet3 51390 302346 0 0 3 0x14200 bored softnet2 52176 200918 0 0 3 0x14200 bored softnet1 6026 284199 0 0 3 0x14200 bored softnet0 82195 388997 0 0 3 0x14200 bored systqmp 6578 45877 0 0 3 0x14200 bored systq 78815 413572 0 0 3 0x14200 tmoslp softclockmp 82262 131134 0 0 3 0x40014200 tmoslp softclock 7040 442781 0 0 3 0x40014200 idle0 1 374213 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 60483 (syz-executor) thread 0xffff8000ffff9460 (283040) exclusive rwlock vmmaplk r = 0 (0xfffffd806bf7d4a8) #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 uvm_mapanon+0x292 #4 uvm_mmapanon+0x1d0 sys/uvm/uvm_mmap.c:1024 #5 sys_mmap+0xa96 sys/uvm/uvm_mmap.c:426 #6 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 52782 (syz-executor) thread 0xffff80003c59f1e0 (115063) exclusive rwlock futex r = 0 (0xffffffff834cdb48) #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 Process 68457 (syz-executor) thread 0xffff80003c5a07c8 (33224) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff835e3950) #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10213 11043K 11487K 166960K 13595 0 pcb 17 15K 16K 166960K 244 0 rtable 201 7K 8K 166960K 511 0 pf 37 18K 22K 166960K 176 0 ifaddr 39 6K 8K 166960K 88 0 ifgroup 55 2K 2K 166960K 127 0 sysctl 3 1K 1K 166960K 3 0 counters 64 36K 37K 166960K 114 0 ioctlops 0 0K 4K 166960K 1892 0 iov 0 0K 18K 166960K 88 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1524 96K 96K 166960K 2816 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 28 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 100 0 dirhash 12 2K 3K 166960K 48 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 93K 166960K 1225 0 sigio 0 0K 0K 166960K 52 0 proc 63 79K 140K 166960K 695 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 295 0 in_multi 84 6K 7K 166960K 169 0 ether_multi 1 0K 0K 166960K 7 0 mrt 1 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 145 652K 652K 166960K 145 0 exec 0 0K 1K 166960K 587 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 235 73K 95K 166960K 13067 0 UVM aobj 44 8K 8K 166960K 47 0 pinsyscall 42 84K 108K 166960K 2370 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 48 0 NDP 12 0K 2K 166960K 60 0 temp 77 6900K 7024K 166960K 48497 0 kqueue 13 20K 30K 166960K 190 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 98 0 95 1 0 1 1 0 8 0 rtentry 112 164 0 74 4 0 4 4 0 8 0 unpcb 144 1144 0 1127 14 13 1 7 0 8 0 syncache 336 6 0 6 4 4 0 1 0 8 0 tcpcb 808 586 0 582 24 23 1 8 0 8 0 arp 120 28 0 9 1 0 1 1 0 8 0 inpcb 376 1704 0 1695 32 30 2 11 0 8 0 nd6 136 35 0 14 1 0 1 1 0 8 0 pkpcb 40 4 0 4 2 2 0 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1168 16 0 16 4 4 0 1 0 8 0 pfstscr 40 130 0 130 1 1 0 1 0 8 0 pffrag 232 5 0 3 1 0 1 1 0 482 0 pffrnode 88 5 0 3 1 0 1 1 0 8 0 pffrent 40 10 0 8 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 95 0 33 1 0 1 1 0 8 0 pfstkey 128 168 0 106 3 0 3 3 0 8 0 pfstate 376 164 0 102 7 0 7 7 0 8 0 pfrule 1344 89 0 84 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 754 0 342 34 7 27 31 0 8 0 art_table 32 756 0 342 4 0 4 4 0 8 0 art_node 16 161 0 80 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 9 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 96 0 87 1 0 1 1 0 8 0 shmpl 112 44 0 3 2 0 2 2 0 8 0 dirhash 1024 41 0 24 3 0 3 3 0 8 0 dino2pl 256 3620 0 2116 95 0 95 95 0 8 0 ffsino 280 3620 0 2116 109 0 109 109 0 8 0 nchpl 144 5423 0 4884 63 40 23 63 0 8 0 uvmvnodes 80 4715 0 0 97 0 97 97 0 8 0 vnodes 216 4715 0 0 262 0 262 262 0 8 0 namei 1024 18859 0 18859 5 3 2 2 0 8 2 percpumem 16 71 0 25 1 0 1 1 0 8 0 kstatmem 264 74 0 50 4 2 2 3 0 8 0 scxspl 216 16047 0 16047 11 10 1 8 1 8 1 plimitpl 152 415 0 399 1 0 1 1 0 8 0 sigapl 424 1545 0 1473 10 1 9 9 0 8 0 futexpl 64 17006 0 17003 1 0 1 1 0 8 0 knotepl 120 559 0 0 17 0 17 17 0 8 0 kqueuepl 216 420 0 411 7 6 1 5 0 8 0 pipepl 328 244 0 217 5 2 3 5 0 8 0 fdescpl 504 1505 0 1473 5 0 5 5 0 8 0 filepl 152 10843 0 10633 30 18 12 22 0 8 0 lockfpl 104 727 0 725 2 1 1 2 0 8 0 lockfspl 48 159 0 157 1 0 1 1 0 8 0 sessionpl 144 27 0 19 1 0 1 1 0 8 0 pgrppl 48 45 0 29 1 0 1 1 0 8 0 ucredpl 104 1716 0 1703 1 0 1 1 0 8 0 zombiepl 144 1559 0 1558 2 1 1 1 0 8 0 processpl 1168 1545 0 1473 7 1 6 6 0 8 0 procpl 648 3357 0 3275 8 0 8 8 0 8 1 srpgc 96 6 0 6 2 2 0 1 0 8 0 sosppl 168 7 0 7 3 3 0 1 0 8 0 sockpl 688 2974 0 2946 46 42 4 19 0 8 1 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 126 0 0 16 0 16 16 0 8 0 mcl2k 2048 24 0 0 3 0 3 3 0 8 0 mtagpl 96 86 0 0 3 0 3 3 0 8 0 mbufpl 256 334 0 0 20 0 20 20 0 8 0 bufpl 280 4677 0 139 325 0 325 325 0 8 0 anonpl 24 213897 0 209558 115 76 39 60 0 185 2 amapchunkpl 152 42382 0 41812 35 9 26 29 0 158 2 amappl16 200 4152 0 4109 52 47 5 16 0 8 1 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 164 0 153 1 0 1 1 0 8 0 amappl13 176 8 0 8 1 1 0 1 0 8 0 amappl12 168 2195 0 2164 3 1 2 2 0 8 0 amappl11 160 51 0 36 1 0 1 1 0 8 0 amappl10 152 4 0 4 2 2 0 1 0 8 0 amappl9 144 254 0 254 1 1 0 1 0 8 0 amappl8 136 21 0 18 1 0 1 1 0 8 0 amappl7 128 142 0 131 1 0 1 1 0 8 0 amappl6 120 207 0 204 1 0 1 1 0 8 0 amappl5 112 135 0 123 1 0 1 1 0 8 0 amappl4 104 331 0 310 1 0 1 1 0 8 0 amappl3 96 8577 0 8459 6 2 4 4 0 8 0 amappl2 88 694 0 632 2 0 2 2 0 8 0 amappl1 80 11612 0 11065 15 2 13 15 0 8 0 amappl 88 12579 0 12397 5 0 5 5 0 92 0 dma32768 32768 2 0 2 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 128 253 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 46 0 3 1 0 1 1 0 8 0 uaddrrnd 24 1506 0 1474 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1506 0 1474 1 0 1 1 0 8 0 vmmpekpl 168 13348 0 13307 3 0 3 3 0 8 0 vmmpepl 168 96379 0 94472 113 21 92 97 0 357 0 vmsppl 456 1505 0 1474 6 1 5 5 0 8 0 rwobjpl 64 31331 0 25647 95 1 94 94 0 8 0 pdppl 4096 3019 0 2948 107 36 71 85 0 8 0 pvpl 32 16554 0 0 135 1 134 134 0 265 0 pmappl 248 1505 0 1474 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 336 0 81 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff80003c5a07c8,ffff80003c658e80,ffff80003c658dd0) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80003c658e80) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c658e80) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe8c709e1480, count: -3 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029b5bff0) 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: 0x76b649b8c710, count: -3