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(ffff8000ffff9c50,ffff80003c4f4b80,ffff80003c4f4ad0) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80003c4f4b80) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4f4b80) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x904ce60fa0, count: -3 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003c4f4aa0 rbx 0 rdx 0 rcx 0xffff8000ffff9c50 rax 0xdeafbeaddeafbead r8 0x7f7fffffc000 r9 0xfffffd807f7d3548 r10 0x500df5e398e99ffe r11 0x9538a99b82435487 r12 0xffff800001485904 r13 0 r14 0xffff80003c4f4b80 r15 0 rip 0xffffffff81017f2b sys_semop+0x45b cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c4f4980 ss 0x10 sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{0}> show proc PROC (syz-executor) tid=70134 pid=67150 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=36, usrpri=50, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff87d0,0xffff8000ffff8030 process=0xffff80003c593480 user=0xffff80003c4ef000, vmspace=0xfffffd806bec5738 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 5168 309766 49508 0 2 0x10 syz-executor 5168 488100 49508 0 3 0x4000090 fsleep syz-executor 67150 371288 68445 0 7 0 syz-executor *67150 70134 68445 0 7 0x4000000 syz-executor 67150 275853 68445 0 2 0x4000000 syz-executor 67150 454621 68445 0 2 0x4000000 syz-executor 84520 61838 5018 0 2 0 syz-executor 84520 263768 5018 0 3 0x4000080 fsleep syz-executor 18456 65591 77767 0 2 0 syz-executor 18456 71955 77767 0 3 0x4000080 fsleep syz-executor 30076 421684 27492 0 2 0 syz-executor 30076 354459 27492 0 2 0x4000000 syz-executor 14860 506476 41495 0 2 0x480 syz-executor 14860 85493 41495 0 3 0x4000080 kqpoll syz-executor 14860 401881 41495 0 3 0x4000080 fsleep syz-executor 29946 518910 0 0 3 0x14200 bored sosplice 84991 131487 0 0 3 0x14280 nfsidl nfsio 81786 444276 0 0 3 0x14280 nfsidl nfsio 96108 459781 0 0 3 0x14280 nfsidl nfsio 45593 411649 0 0 3 0x14280 nfsidl nfsio 87040 364245 0 0 3 0x14280 nfsidl nfsio 61140 493579 0 0 3 0x14280 nfsidl nfsio 99671 487641 0 0 3 0x14280 nfsidl nfsio 64142 186789 0 0 3 0x14280 nfsidl nfsio 57911 477360 0 0 3 0x14280 nfsidl nfsio 22921 359878 0 0 3 0x14280 nfsidl nfsio 57343 153244 0 0 3 0x14280 nfsidl nfsio 64862 121821 0 0 3 0x14280 nfsidl nfsio 2479 280204 0 0 3 0x14280 nfsidl nfsio 63710 385314 0 0 3 0x14280 nfsidl nfsio 61424 441441 0 0 3 0x14280 nfsidl nfsio 57098 345312 0 0 3 0x14280 nfsidl nfsio 12285 280364 0 0 3 0x14280 nfsidl nfsio 61082 144984 0 0 3 0x14280 nfsidl nfsio 42137 121971 0 0 3 0x14280 nfsidl nfsio 79020 489812 0 0 3 0x14280 nfsidl nfsio 25203 227020 68310 0 3 0x100082 sbwait ndp 68310 336742 35980 0 3 0x10008a sigsusp sh 41495 170342 27274 0 2 0x2 syz-executor 68445 215149 27274 0 2 0x482 syz-executor 83209 248752 27274 0 2 0x2 syz-executor 27492 464367 27274 0 2 0x2 syz-executor 35980 382307 27274 0 3 0x82 wait syz-executor 77767 345510 27274 0 3 0x82 nanoslp syz-executor 49508 418735 27274 0 3 0x82 nanoslp syz-executor 5018 242992 27274 0 3 0x82 nanoslp syz-executor 27274 293601 77468 0 3 0x82 kqread syz-executor 77468 452711 94307 0 3 0x10008a sigsusp ksh 94307 308580 8817 0 3 0x98 kqread sshd-session 8817 479701 50029 0 3 0x92 kqread sshd-session 89840 202212 1 0 3 0x100083 ttyopn getty 50029 439625 1 0 3 0x88 kqread sshd 24391 217034 33707 74 3 0x1100092 bpf pflogd 33707 175174 1 0 3 0x80 sbwait pflogd 82391 145767 2948 73 3 0x1100090 kqread syslogd 2948 474238 1 0 3 0x100082 sbwait syslogd 68527 50572 1 0 3 0x100080 kqread resolvd 83151 157472 19817 77 3 0x100092 kqread dhcpleased 48183 465367 19817 77 3 0x100092 kqread dhcpleased 19817 108862 1 0 3 0x80 kqread dhcpleased 90497 195394 0 0 3 0x14200 bored smr 37647 61846 0 0 2 0x14200 zerothread 72421 289697 0 0 3 0x14200 aiodoned aiodoned 29919 281795 0 0 3 0x14200 syncer update 7523 242640 0 0 3 0x14200 cleaner cleaner 170 221415 0 0 3 0x14200 reaper reaper 78994 184249 0 0 3 0x14200 pgdaemon pagedaemon 67339 385506 0 0 3 0x14200 bored viomb 8755 495857 0 0 3 0x40014200 acpi0 acpi0 22714 483016 0 0 3 0x40014200 idle1 75223 82424 0 0 3 0x14200 bored softnet3 40042 514898 0 0 3 0x14200 bored softnet2 90128 65252 0 0 3 0x14200 bored softnet1 97822 298801 0 0 3 0x14200 bored softnet0 82454 292922 0 0 3 0x14200 bored systqmp 56625 446351 0 0 3 0x14200 bored systq 64419 501007 0 0 2 0x14200 softclockmp 23409 153847 0 0 2 0x40014200 softclock 4244 77674 0 0 3 0x40014200 idle0 1 137279 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 67150 (syz-executor) thread 0xffff8000ffff7218 (371288) exclusive rwlock uobjlk r = 0 (0xfffffd806bedb8a8) #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 uvm_fault+0x1e9 sys/uvm/uvm_fault.c:690 #3 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #4 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806bec5838) #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_read+0x3af sys/kern/kern_rwlock.c:405 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1864 #3 uvm_fault_check+0x4b sys/uvm/uvm_fault.c:732 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:668 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #6 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #7 recall_trap+0x8 Process 67150 (syz-executor) thread 0xffff8000ffff9c50 (70134) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8394c480) #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 sleep_finish+0x24f sys/kern/kern_synch.c:414 #4 rw_do_enter_read+0x2de sys/kern/kern_rwlock.c:385 #5 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1864 #6 uvm_fault_check+0x4b sys/uvm/uvm_fault.c:732 #7 uvm_fault+0x106 sys/uvm/uvm_fault.c:668 #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+0x57 #12 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #13 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10192 11020K 11479K 166960K 11677 0 pcb 17 12K 12K 166960K 61 0 rtable 215 10K 11K 166960K 386 0 pf 33 17K 18K 166960K 70 0 ifaddr 39 6K 7K 166960K 62 0 ifgroup 51 2K 2K 166960K 91 0 sysctl 3 1K 1K 166960K 5 0 counters 62 36K 36K 166960K 90 0 ioctlops 0 0K 4K 166960K 1517 0 iov 0 0K 16K 166960K 17 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1360 86K 86K 166960K 1590 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 10 0K 0K 166960K 17 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 97K 166960K 444 0 sigio 0 0K 0K 166960K 3 0 proc 72 91K 128K 166960K 564 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 55 0 in_multi 88 6K 6K 166960K 117 0 ether_multi 1 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 403 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 219 72K 77K 166960K 5720 0 UVM aobj 10 2K 2K 166960K 12 0 pinsyscall 44 88K 104K 166960K 1537 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 9 0 NDP 11 0K 1K 166960K 39 0 temp 48 8636K 8715K 166960K 16368 0 kqueue 14 22K 28K 166960K 73 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 49 0 45 1 0 1 1 0 8 0 rtentry 112 123 0 25 3 0 3 3 0 8 0 unpcb 144 329 0 311 6 0 6 6 0 8 5 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpcb 808 83 0 78 1 0 1 1 0 8 0 arp 120 22 0 6 1 0 1 1 0 8 0 inpcb 376 390 0 382 8 0 8 8 0 8 7 nd6 136 24 0 3 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 7 0 7 1 0 1 1 0 8 1 pppxif 1472 3 0 3 1 0 1 1 0 8 1 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 2 0 0 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 34 0 0 1 0 1 1 0 8 0 pfstkey 128 34 0 0 2 0 2 2 0 8 0 pfstate 376 34 0 0 4 0 4 4 0 8 0 pfrule 1344 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 485 0 70 27 0 27 27 0 8 0 art_table 32 486 0 70 4 0 4 4 0 8 0 art_node 16 122 0 34 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 2 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 14 0 7 1 0 1 1 0 8 0 shmpl 112 9 0 2 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2115 0 608 95 0 95 95 0 8 0 ffsino 280 2115 0 608 109 0 109 109 0 8 0 nchpl 144 2730 0 1045 63 0 63 63 0 8 0 uvmvnodes 80 2347 0 0 48 0 48 48 0 8 0 vnodes 216 2347 0 0 131 0 131 131 0 8 0 namei 1024 8625 0 8625 2 1 1 2 0 8 1 percpumem 16 59 0 14 1 0 1 1 0 8 0 kstatmem 264 44 0 22 2 0 2 2 0 8 0 scxspl 216 8615 0 8615 6 2 4 4 1 8 4 plimitpl 152 119 0 101 1 0 1 1 0 8 0 sigapl 424 766 0 695 9 0 9 9 0 8 0 futexpl 64 4730 0 4726 1 0 1 1 0 8 0 knotepl 120 547 0 0 17 0 17 17 0 8 0 kqueuepl 216 108 0 98 1 0 1 1 0 8 0 pipepl 328 138 0 111 3 0 3 3 0 8 0 fdescpl 504 727 0 695 6 0 6 6 0 8 1 filepl 152 3382 0 3171 14 0 14 14 0 8 5 lockfpl 104 68 0 66 1 0 1 1 0 8 0 lockfspl 48 30 0 28 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 39 0 22 1 0 1 1 0 8 0 ucredpl 104 513 0 498 1 0 1 1 0 8 0 zombiepl 144 695 0 695 1 0 1 1 0 8 1 processpl 1168 766 0 695 6 0 6 6 0 8 0 procpl 656 1290 0 1210 8 0 8 8 0 8 0 srpgc 96 2 0 2 1 1 0 1 0 8 0 sosppl 168 2 0 2 1 0 1 1 0 8 1 sockpl 688 773 0 743 15 4 11 15 0 8 8 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 109 0 0 14 0 14 14 0 8 0 mcl2k 2048 22 0 0 3 0 3 3 0 8 0 mtagpl 96 16 0 0 1 0 1 1 0 8 0 mbufpl 256 217 0 0 15 1 14 14 0 8 0 bufpl 280 3016 0 163 204 0 204 204 0 8 0 anonpl 24 141172 0 137797 47 0 47 47 0 184 21 amapchunkpl 152 17991 0 17529 26 0 26 26 0 158 6 amappl16 200 2988 0 2959 23 12 11 15 0 8 8 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 116 0 103 1 0 1 1 0 8 0 amappl13 176 4 0 4 1 1 0 1 0 8 0 amappl12 168 1369 0 1336 4 1 3 3 0 8 0 amappl11 160 50 0 36 1 0 1 1 0 8 0 amappl10 152 9 0 9 1 1 0 1 0 8 0 amappl9 144 252 0 252 1 1 0 1 0 8 0 amappl8 136 24 0 21 1 0 1 1 0 8 0 amappl7 128 108 0 94 1 0 1 1 0 8 0 amappl6 120 180 0 176 1 0 1 1 0 8 0 amappl5 112 122 0 112 1 0 1 1 0 8 0 amappl4 104 319 0 299 1 0 1 1 0 8 0 amappl3 96 3359 0 3250 4 0 4 4 0 8 0 amappl2 88 663 0 598 2 0 2 2 0 8 0 amappl1 80 9408 0 8814 14 0 14 14 0 8 0 amappl 88 5315 0 5154 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 0 1 1 0 8 1 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 11 0 2 1 0 1 1 0 8 0 uaddrrnd 24 727 0 695 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 727 0 695 1 0 1 1 0 8 0 vmmpekpl 168 7696 0 7657 3 0 3 3 0 8 0 vmmpepl 168 51934 0 50056 95 0 95 95 0 357 9 vmsppl 456 726 0 695 5 0 5 5 0 8 0 rwobjpl 64 19761 0 16450 54 0 54 54 0 8 0 pdppl 4096 1462 0 1390 100 26 74 88 0 8 2 pvpl 32 15619 0 0 126 0 126 126 0 265 0 pmappl 248 726 0 695 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 281 0 30 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff8000ffff9c50,ffff80003c4f4b80,ffff80003c4f4ad0) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80003c4f4b80) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4f4b80) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x904ce60fa0, count: -3 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029a9bff0) 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 __mp_lock(ffffffff8394c278) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8394c278) at __mp_lock+0x192 sys/kern/kern_lock.c:144 uvm_fault(fffffd806bec5738,90c807b000,0,2) at uvm_fault+0x1ee sys/uvm/uvm_fault.c:691 upageflttrap(ffff80003c4dc340,90c807b000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80003c4dc340) at usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x769ec1cd77f0, count: -8