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(ffff80003a820a68,ffff80003c443070,ffff80003c442fc0) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80003c443070) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c443070) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc1d3333a140, count: -3 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c442f90 rbx 0 rdx 0 rcx 0xffff80003a820a68 rax 0xdeaf4152deaf4152 r8 0x7f7fffffc000 r9 0xfffffd80097fb548 r10 0x64b41091e404c965 r11 0xb346f0bf3248a44e r12 0xffff80003c442e74 r13 0 r14 0xffff80003c443070 r15 0 rip 0xffffffff822baddb sys_semop+0x45b cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c442e70 ss 0x10 sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{1}> show proc PROC (syz-executor) tid=134527 pid=14699 tcnt=4 stat=onproc flags process=10 proc=4000000 runpri=36, usrpri=50, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003a8219c8,0xffff80003a820d08 process=0xffff800039010020 user=0xffff80003c43e000, vmspace=0xfffffd806c343b70 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 29294 504062 1091 32767 2 0x10 syz-executor 14699 305651 42238 32767 7 0x10 syz-executor *14699 134527 42238 32767 7 0x4000010 syz-executor 14699 285743 42238 32767 3 0x4000090 fsleep syz-executor 14699 78593 42238 32767 3 0x4000090 fsleep syz-executor 19521 308213 58451 32767 3 0x90 nanoslp syz-executor 19521 358219 58451 32767 3 0x4000090 ttyin syz-executor 19521 347366 58451 32767 3 0x4000090 fsleep syz-executor 19521 32426 58451 32767 3 0x4000090 fsleep syz-executor 51859 458369 96253 32767 3 0x90 nanoslp syz-executor 51859 388251 96253 32767 3 0x4000090 lockf syz-executor 51859 107009 96253 32767 3 0x4000090 fsleep syz-executor 17633 146062 28149 32767 3 0x90 nanoslp syz-executor 17633 138325 28149 32767 3 0x4000090 sbwait syz-executor 17633 224058 28149 32767 3 0x4000090 fsleep syz-executor 99554 277664 73477 32767 3 0x90 nanoslp syz-executor 99554 477912 73477 32767 3 0x4000090 lockf syz-executor 99554 293214 73477 32767 3 0x4000090 fsleep syz-executor 69413 316349 87501 32767 3 0x90 nanoslp syz-executor 69413 489341 87501 32767 3 0x4000090 kqpoll syz-executor 19958 99076 0 0 3 0x14200 bored sosplice 73477 95213 92068 32767 3 0x90 nanoslp syz-executor 87501 236707 60886 32767 3 0x90 nanoslp syz-executor 42238 209130 32964 32767 3 0x90 nanoslp syz-executor 43229 414417 49008 32767 3 0x90 nanoslp syz-executor 28149 186610 70178 32767 3 0x90 nanoslp syz-executor 96253 171263 82527 32767 3 0x90 nanoslp syz-executor 1091 185495 51691 32767 3 0x90 nanoslp syz-executor 58451 348569 2736 32767 3 0x90 nanoslp syz-executor 70178 453872 12861 0 3 0x82 wait syz-executor 82527 387323 12861 0 3 0x82 wait syz-executor 60886 76981 12861 0 3 0x82 wait syz-executor 2736 251205 12861 0 3 0x82 wait syz-executor 92068 43881 12861 0 3 0x82 wait syz-executor 49008 144000 12861 0 3 0x82 wait syz-executor 51691 262679 12861 0 3 0x82 wait syz-executor 32964 462784 12861 0 3 0x82 wait syz-executor 12861 377458 80694 0 3 0x82 kqread syz-executor 80694 434562 57249 0 3 0x10008a sigsusp ksh 57249 445305 71891 0 3 0x98 kqread sshd-session 71891 81548 2517 0 3 0x92 kqread sshd-session 46531 379206 1 0 3 0x100083 ttyin getty 2517 285017 1 0 3 0x88 kqread sshd 22071 497725 25455 73 3 0x1100090 kqread syslogd 25455 26489 1 0 3 0x100082 sbwait syslogd 17560 181781 1 0 3 0x100080 kqread resolvd 90611 329969 48583 77 3 0x100092 kqread dhcpleased 18561 491006 48583 77 3 0x100092 kqread dhcpleased 48583 264962 1 0 3 0x80 kqread dhcpleased 19402 207696 0 0 3 0x14200 bored smr 17703 228779 0 0 3 0x14200 pgzero zerothread 89416 210940 0 0 3 0x14200 aiodoned aiodoned 45037 328425 0 0 3 0x14200 syncer update 98489 473114 0 0 3 0x14200 cleaner cleaner 74587 5610 0 0 3 0x14200 reaper reaper 91809 269088 0 0 3 0x14200 pgdaemon pagedaemon 57864 76507 0 0 3 0x14200 bored viomb 55659 355483 0 0 3 0x40014200 acpi0 acpi0 60573 490808 0 0 3 0x40014200 idle1 45957 205847 0 0 3 0x14200 bored softnet3 38378 64614 0 0 3 0x14200 bored softnet2 75565 108859 0 0 3 0x14200 bored softnet1 17669 357989 0 0 3 0x14200 bored softnet0 15649 95658 0 0 3 0x14200 bored systqmp 36335 351700 0 0 3 0x14200 bored systq 953 180806 0 0 3 0x14200 tmoslp softclockmp 50810 199927 0 0 3 0x40014200 tmoslp softclock 98839 166368 0 0 3 0x40014200 idle0 1 84272 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 14699 (syz-executor) thread 0xffff80003a820a68 (134527) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a12158) #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 sleep_finish+0x24f sys/kern/kern_synch.c:412 #4 rw_do_enter_read+0x2a7 sys/kern/kern_rwlock.c:380 #5 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1924 #6 uvm_fault_check+0x4a sys/uvm/uvm_fault.c:741 #7 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #8 kpageflttrap+0x2d0 sys/arch/amd64/amd64/trap.c:279 #9 kerntrap+0x14a sys/arch/amd64/amd64/trap.c:332 #10 alltraps_kern_meltdown+0x7b #11 _copyin+0x62 #12 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #13 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10194 10955K 10966K 166960K 11271 0 pcb 17 12K 12K 166960K 17 0 rtable 240 6K 6K 166960K 355 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 1 1K 9K 166960K 5 0 counters 68 36K 36K 166960K 68 0 ioctlops 0 0K 2K 166960K 34 0 iov 0 0K 2K 166960K 2 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1360 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 9 0K 0K 166960K 10 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 26 97K 117K 166960K 254 0 sigio 1 0K 0K 166960K 2 0 proc 58 79K 115K 166960K 484 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 31 0 in_multi 99 7K 7K 166960K 109 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 91 413K 413K 166960K 91 0 exec 0 0K 1K 166960K 351 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 272 170K 182K 166960K 3843 0 UVM aobj 5 2K 4K 166960K 6 0 pinsyscall 47 94K 106K 166960K 1271 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 7 0 NDP 11 0K 2K 166960K 27 0 temp 42 8675K 8739K 166960K 4116 0 kqueue 14 22K 26K 166960K 37 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 46 0 43 1 0 1 1 0 8 0 rtentry 176 114 0 1 6 0 6 6 0 8 0 unpcb 144 154 0 136 3 0 3 3 0 8 1 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpcb 808 49 0 43 2 0 2 2 0 8 1 arp 128 18 0 0 1 0 1 1 0 8 0 ipq 40 1 0 1 1 0 1 1 0 8 1 ipqe 40 2 0 2 1 0 1 1 0 8 1 inpcb 384 162 0 152 2 0 2 2 0 8 0 ip6q 72 1 0 0 1 0 1 1 0 8 0 ip6af 40 1 0 0 1 0 1 1 0 8 0 nd6 144 27 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 477 0 0 30 0 30 30 0 8 0 art_table 32 478 0 0 4 0 4 4 0 8 0 art_node 16 113 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 112 8 0 1 1 0 1 1 0 8 0 shmpl 112 3 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1712 0 209 95 0 95 95 0 8 0 ffsino 288 1712 0 209 108 0 108 108 0 8 0 nchpl 144 2057 0 376 63 0 63 63 0 8 0 uvmvnodes 80 1793 0 0 37 0 37 37 0 8 0 vnodes 216 1793 0 0 100 0 100 100 0 8 0 namei 1024 6382 0 6382 2 0 2 2 0 8 2 percpumem 16 49 0 0 1 0 1 1 0 8 0 kstatmem 264 24 0 0 2 0 2 2 0 8 0 scxspl 216 6855 0 6855 2 0 2 2 1 8 2 plimitpl 152 54 0 28 2 0 2 2 0 8 0 sigapl 424 531 0 474 7 0 7 7 0 8 0 knotepl 120 342 0 0 11 0 11 11 0 8 0 kqueuepl 224 49 0 38 1 0 1 1 0 8 0 pipepl 336 139 0 112 6 0 6 6 0 8 3 fdescpl 520 512 0 474 3 0 3 3 0 8 0 filepl 160 2299 0 2074 16 0 16 16 0 8 3 lockfpl 104 34 0 26 1 0 1 1 0 8 0 lockfspl 48 13 0 9 1 0 1 1 0 8 0 sessionpl 144 24 0 8 1 0 1 1 0 8 0 pgrppl 48 34 0 10 1 0 1 1 0 8 0 ucredpl 104 261 0 242 1 0 1 1 0 8 0 zombiepl 144 475 0 474 1 0 1 1 0 8 0 processpl 1240 531 0 474 5 0 5 5 0 8 0 procpl 656 739 0 669 7 0 7 7 0 8 0 sosppl 168 1 0 1 1 0 1 1 0 8 1 sockpl 728 363 0 332 8 0 8 8 0 8 4 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 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 198 0 0 13 0 13 13 0 8 0 bufpl 280 2562 0 117 175 0 175 175 0 8 0 anonpl 32 5533 0 0 45 0 45 45 0 246 0 amapchunkpl 152 11411 0 10805 29 0 29 29 0 158 5 amappl16 200 2069 0 2046 5 1 4 5 0 8 1 amappl15 192 11 0 11 1 1 0 1 0 8 0 amappl14 184 106 0 96 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 1114 0 1076 2 0 2 2 0 8 0 amappl11 160 46 0 36 1 0 1 1 0 8 0 amappl10 152 7 0 7 1 1 0 1 0 8 0 amappl9 144 252 0 252 1 1 0 1 0 8 0 amappl8 136 22 0 21 1 0 1 1 0 8 0 amappl7 128 96 0 86 1 0 1 1 0 8 0 amappl6 120 170 0 167 1 0 1 1 0 8 0 amappl5 112 111 0 105 1 0 1 1 0 8 0 amappl4 104 286 0 272 1 0 1 1 0 8 0 amappl3 96 1945 0 1805 4 0 4 4 0 8 0 amappl2 88 610 0 556 2 0 2 2 0 8 0 amappl1 80 8891 0 8300 14 0 14 14 0 8 0 amappl 88 3185 0 2981 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 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 5 0 1 1 0 1 1 0 8 0 uaddrrnd 24 512 0 474 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 512 0 474 1 0 1 1 0 8 0 vmmpekpl 168 6104 0 6072 2 0 2 2 0 8 0 vmmpepl 168 39153 0 36980 101 0 101 101 0 357 4 vmsppl 480 511 0 474 7 1 6 6 0 8 0 rwobjpl 72 15542 0 12877 49 0 49 49 0 8 0 pdppl 4096 1032 0 948 106 20 86 94 0 8 2 pvpl 32 13223 0 0 108 1 107 107 0 265 0 pmappl 256 511 0 474 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 395 0 23 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(ffffffff8382aff0) 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(ffffffff83a11f50) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:128 [inline] __mp_lock(ffffffff83a11f50) at __mp_lock+0x192 sys/kern/kern_lock.c:159 syscall(ffff800030bd8510) at syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800030bd8510) at syscall+0xae6 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x722ca4ce9eb0, count: -6 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{1}> trace sys_semop(ffff80003a820a68,ffff80003c443070,ffff80003c442fc0) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80003c443070) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c443070) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc1d3333a140, count: -3