kernel: protection fault trap, code=0 Stopped at sys_semop+0x352: movzwl 0x8(%rbx),%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(ffff80002a232010,ffff800032f9b370,ffff800032f9b2c0) at sys_semop+0x352 sys/kern/sysv_sem.c:624 syscall(ffff800032f9b370) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800032f9b370) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xad0cab45040, count: -3 ddb{1}> show registers rdi 0 rsi 0x40 rbp 0xffff800032f9b290 rbx 0xdeadbeefdeadbf5b rdx 0 rcx 0xffff80002a232010 rax 0xffff8000299adff0 r8 0x7f7fffffc000 r9 0xfffffd80097fd270 r10 0x7438e6cdd6918df1 r11 0x77a3c71fc0886d9 r12 0x40 r13 0xfffffd806119c930 r14 0xffff800032f9b370 r15 0x40 rip 0xffffffff812bf3b2 sys_semop+0x352 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800032f9b1a0 ss 0x10 sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> show proc PROC (syz-executor) tid=520095 pid=93226 tcnt=3 stat=onproc flags process=10 proc=4000000 runpri=36, usrpri=72, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000393c9a10,0xffff8000393c8d28 process=0xffff80003bfe7040 user=0xffff800032f96000, vmspace=0xfffffd806a49cd80 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 45147 523805 64441 32767 2 0x10 syz-executor 45147 276897 64441 32767 3 0x4000090 fsleep syz-executor 46341 347110 86667 32767 2 0x10 syz-executor 46341 514301 86667 32767 3 0x4000090 fsleep syz-executor 93226 68673 56170 32767 7 0x10 syz-executor *93226 520095 56170 32767 7 0x4000010 syz-executor 93226 445646 56170 32767 2 0x4000010 syz-executor 28242 42543 6911 32767 3 0x90 nanoslp syz-executor 28242 171945 6911 32767 3 0x4000090 pipewr syz-executor 28242 364171 6911 32767 3 0x4000090 fsleep syz-executor 8895 401728 73841 32767 3 0x90 nanoslp syz-executor 8895 340167 73841 32767 3 0x4000090 kqread syz-executor 8895 53129 73841 32767 3 0x4000090 fsleep syz-executor 94155 225379 69080 0 3 0x100082 sbwait arp 69080 213637 66793 0 3 0x10008a sigsusp sh 73841 356847 49673 32767 3 0x90 nanoslp syz-executor 48478 278541 50244 32767 3 0x90 nanoslp syz-executor 6911 413251 94153 32767 3 0x90 nanoslp syz-executor 56170 67424 93219 32767 3 0x90 nanoslp syz-executor 64441 48228 57106 32767 3 0x90 nanoslp syz-executor 86667 220421 21095 32767 3 0x90 nanoslp syz-executor 66793 153855 29802 0 3 0x80 wait syz-executor 94153 359792 54796 0 3 0x82 wait syz-executor 93219 19579 54796 0 3 0x82 wait syz-executor 50244 340785 54796 0 3 0x82 wait syz-executor 57106 489967 54796 0 3 0x82 wait syz-executor 21095 431571 54796 0 3 0x82 wait syz-executor 49673 452809 54796 0 3 0x82 wait syz-executor 29802 275208 54796 0 3 0x82 wait syz-executor 54796 419327 99763 0 3 0x82 nanoslp syz-executor 99763 426339 48218 0 3 0x10008a sigsusp ksh 48218 156172 93755 0 3 0x98 kqread sshd-session 93755 465470 55556 0 3 0x92 kqread sshd-session 92927 111773 1 0 3 0x100083 ttyin getty 55556 494187 1 0 3 0x88 kqread sshd 10223 56800 10957 73 3 0x1100090 kqread syslogd 10957 121171 1 0 3 0x100082 sbwait syslogd 26923 136458 1 0 3 0x100080 kqread resolvd 96483 520928 2775 77 3 0x100092 kqread dhcpleased 65953 97152 2775 77 3 0x100092 kqread dhcpleased 2775 517188 1 0 3 0x80 kqread dhcpleased 96293 288786 0 0 3 0x14200 bored smr 81432 41770 0 0 2 0x14200 zerothread 44288 113840 0 0 3 0x14200 aiodoned aiodoned 88726 55654 0 0 3 0x14200 syncer update 89356 286186 0 0 3 0x14200 cleaner cleaner 76826 111434 0 0 3 0x14200 reaper reaper 99478 136321 0 0 3 0x14200 pgdaemon pagedaemon 22523 372887 0 0 3 0x14200 bored viomb 49820 45275 0 0 3 0x40014200 acpi0 acpi0 38918 376513 0 0 3 0x40014200 idle1 53785 96003 0 0 3 0x14200 bored softnet1 24403 30832 0 0 3 0x14200 bored softnet0 65387 232097 0 0 3 0x14200 bored systqmp 82813 387801 0 0 3 0x14200 bored systq 4675 189414 0 0 3 0x14200 tmoslp softclockmp 44135 194309 0 0 3 0x40014200 tmoslp softclock 53216 515601 0 0 3 0x40014200 idle0 1 25320 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 93226 (syz-executor) thread 0xffff80002a232010 (520095) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a3cdc0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 sleep_finish+0x2d8 sys/kern/kern_synch.c:369 #3 rw_do_enter_read+0x309 sys/kern/kern_rwlock.c:-1 #4 uvm_fault_check+0x8a9 sys/uvm/uvm_fault.c:834 #5 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #6 kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283 #7 kerntrap+0x19d sys/arch/amd64/amd64/trap.c:528 #8 alltraps_kern_meltdown+0x7b #9 _copyin+0x5b #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #11 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11050 12016K 12034K 166960K 12144 0 pcb 17 12K 12K 166960K 17 0 rtable 205 5K 6K 166960K 337 0 pf 29 16K 16K 166960K 31 0 ifaddr 36 6K 7K 166960K 42 0 ifgroup 46 2K 2K 166960K 50 0 sysctl 2 1K 9K 166960K 7 0 counters 68 36K 37K 166960K 70 0 ioctlops 0 0K 2K 166960K 34 0 iov 0 0K 16K 166960K 3 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1287 81K 81K 166960K 1428 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 10 1K 1K 166960K 43 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 24 89K 125K 166960K 270 0 sigio 0 0K 0K 166960K 4 0 proc 58 99K 180K 166960K 504 0 subproc 63 3K 4K 166960K 108 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 26 0 in_multi 78 5K 6K 166960K 95 0 ether_multi 1 0K 0K 166960K 2 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 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 364 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 245 161K 192K 166960K 4082 0 UVM aobj 6 2K 3K 166960K 7 0 pinsyscall 46 92K 116K 166960K 1332 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 10 0K 1K 166960K 25 0 temp 32 9074K 9138K 166960K 4382 0 kqueue 13 20K 32K 166960K 57 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 51 0 46 1 0 1 1 0 8 0 rtentry 176 106 0 12 5 0 5 5 0 8 0 unpcb 144 97 0 82 2 0 2 2 0 8 1 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpqe 32 2 0 2 1 0 1 1 0 8 1 tcpcb 736 109 0 103 4 0 4 4 0 8 3 arp 136 17 0 2 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 1 0 0 1 0 1 1 0 8 0 inpcb 328 269 0 258 7 0 7 7 0 8 5 nd6 152 24 0 3 1 0 1 1 0 8 0 kcovpl 48 12 0 5 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 417 0 44 27 0 27 27 0 8 1 art_table 40 418 0 44 5 0 5 5 0 8 0 art_node 32 106 0 20 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semapl 112 40 0 33 1 0 1 1 0 8 0 shmpl 112 4 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1753 0 288 92 0 92 92 0 8 0 ffsino 296 1753 0 288 113 0 113 113 0 8 0 nchpl 144 2111 0 418 63 0 63 63 0 8 0 vnodes 216 1870 0 0 104 0 104 104 0 8 0 namei 1024 6327 0 6327 2 0 2 2 0 8 2 percpumem 16 50 0 1 1 0 1 1 0 8 0 kstatmem 264 24 0 2 2 0 2 2 0 8 0 scxspl 216 7155 0 7155 9 1 8 8 1 8 8 plimitpl 152 62 0 39 2 0 2 2 0 8 1 sigapl 424 550 0 498 7 0 7 7 0 8 0 knotepl 120 108 0 0 4 0 4 4 0 8 0 kqueuepl 224 70 0 60 2 0 2 2 0 8 1 pipepl 344 138 0 110 3 0 3 3 0 8 0 fdescpl 528 534 0 498 4 0 4 4 0 8 0 filepl 160 2366 0 2166 14 0 14 14 0 8 4 lockfpl 104 54 0 52 1 0 1 1 0 8 0 lockfspl 48 18 0 16 1 0 1 1 0 8 0 sessionpl 144 32 0 16 1 0 1 1 0 8 0 pgrppl 48 45 0 22 1 0 1 1 0 8 0 ucredpl 104 357 0 340 1 0 1 1 0 8 0 zombiepl 144 499 0 498 1 0 1 1 0 8 0 processpl 1232 550 0 498 5 0 5 5 0 8 0 procpl 664 749 0 689 6 0 6 6 0 8 0 sockpl 752 421 0 389 10 0 10 10 0 8 6 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 123 0 0 16 0 16 16 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 211 0 0 14 0 14 14 0 8 0 bufpl 280 2360 0 102 162 0 162 162 0 8 0 anonpl 32 7377 0 0 60 0 60 60 0 246 0 amapchunkpl 152 11920 0 11402 26 0 26 26 0 158 4 amappl16 200 2073 0 2053 15 1 14 14 0 8 11 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 409 0 407 1 0 1 1 0 8 0 amappl13 176 113 0 101 1 0 1 1 0 8 0 amappl12 168 759 0 725 2 0 2 2 0 8 0 amappl11 160 16 0 16 2 2 0 1 0 8 0 amappl10 152 65 0 55 1 0 1 1 0 8 0 amappl9 144 261 0 261 1 1 0 1 0 8 0 amappl8 136 92 0 91 1 0 1 1 0 8 0 amappl7 128 137 0 125 1 0 1 1 0 8 0 amappl6 120 150 0 148 1 0 1 1 0 8 0 amappl5 112 95 0 87 1 0 1 1 0 8 0 amappl4 104 263 0 245 1 0 1 1 0 8 0 amappl3 96 2164 0 2042 5 1 4 4 0 8 0 amappl2 88 511 0 455 2 0 2 2 0 8 0 amappl1 80 10307 0 9711 18 0 18 18 0 8 2 amappl 88 3387 0 3210 5 0 5 5 0 92 0 uvmvnodes 80 98 0 0 2 0 2 2 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 6 0 1 1 0 1 1 0 8 0 uaddrrnd 24 534 0 498 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 534 0 498 1 0 1 1 0 8 0 vmmpekpl 168 6345 0 6306 3 0 3 3 0 8 1 vmmpepl 168 43040 0 41020 108 0 108 108 0 357 11 vmsppl 488 533 0 498 7 1 6 6 0 8 0 rwobjpl 80 15440 0 14468 27 0 27 27 0 8 2 pdppl 4096 1075 0 996 107 24 83 97 0 8 4 pvpl 32 14141 0 0 116 1 115 115 0 265 0 pmappl 256 533 0 498 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 280 0 27 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff838e5ff0) 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(ffffffff83a3c5c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a3c5c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff83a3c5c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a3c5c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff80003bbf7820) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003bbf7820) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7bdf81f5eb50, count: -10 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> trace sys_semop(ffff80002a232010,ffff800032f9b370,ffff800032f9b2c0) at sys_semop+0x352 sys/kern/sysv_sem.c:624 syscall(ffff800032f9b370) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800032f9b370) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xad0cab45040, count: -3