kernel: protection fault trap, code=0 Stopped at sys_semop+0x3d5: 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(ffff800031be6a98,ffff80003a801380,ffff80003a8012d0) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003a801380) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a801380) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a47210dce0, count: -3 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003a8012a0 rbx 0xdeafbeaddeafbead rdx 0 rcx 0xffff800031be6a98 rax 0xdeafbeaddeafbead r8 0x7f7fffffc000 r9 0 r10 0xa0d1014468cc72ea r11 0xb01facad21371c43 r12 0 r13 0xfffffd806b221c40 r14 0xffff80003a801380 r15 0 rip 0xffffffff82bf7625 sys_semop+0x3d5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003a8011b0 ss 0x10 sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{0}> show proc PROC (syz-executor) tid=29536 pid=51744 tcnt=4 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=0xffff800031be6800,0xffff800031be6578 process=0xffff80003c4244f0 user=0xffff80003a7fc000, vmspace=0xfffffd800e3b3208 estcpu=34, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 1263 499261 62806 0 2 0 syz-executor 1263 434620 62806 0 3 0x4000080 fsleep syz-executor 49076 355162 64583 0 2 0 syz-executor 49076 419474 64583 0 3 0x4000080 ttyout syz-executor 49076 413070 64583 0 2 0x4000000 syz-executor 31869 320478 75716 0 2 0 syz-executor 31869 486989 75716 0 3 0x4000080 kqread syz-executor 31869 161746 75716 0 2 0x4000000 syz-executor 28654 213404 66062 0 3 0x80 nanoslp syz-executor 28654 212139 66062 0 3 0x4000080 ttyretype syz-executor 28654 87274 66062 0 3 0x4000080 fsleep syz-executor 28654 179461 66062 0 3 0x4000080 fsleep syz-executor 51744 472835 53204 0 2 0 syz-executor *51744 29536 53204 0 7 0x4000000 syz-executor 51744 146988 53204 0 3 0x4000080 fsleep syz-executor 51744 89546 53204 0 3 0x4000080 fsleep syz-executor 8934 279898 12250 0 2 0 syz-executor 8934 252928 12250 0 2 0x4000000 syz-executor 8934 354169 12250 0 3 0x4000080 fsleep syz-executor 73351 511128 42312 0 2 0x1 syz-executor 73351 239560 42312 0 3 0x4000080 fsleep syz-executor 73351 83590 42312 0 3 0x4000080 fsleep syz-executor 73351 74749 42312 0 3 0x4000080 fsleep syz-executor 66062 28513 28373 0 2 0x3 syz-executor 2832 407980 28373 0 2 0x2 syz-executor 42312 161575 28373 0 3 0x82 nanoslp syz-executor 62806 425256 28373 0 2 0x3 syz-executor 12220 338839 1 0 3 0x100083 ttyopn getty 75716 111615 28373 0 2 0x3 syz-executor 64583 248605 28373 0 2 0x3 syz-executor 12250 417391 28373 0 3 0x82 nanoslp syz-executor 53204 375155 28373 0 3 0x82 nanoslp syz-executor 28373 424789 18647 0 3 0x82 kqread syz-executor 18647 52751 39296 0 3 0x10008a sigsusp ksh 39296 133398 80186 0 3 0x98 kqread sshd-session 80186 219213 66457 0 3 0x92 kqread sshd-session 66457 86061 1 0 3 0x88 kqread sshd 56531 242176 25402 74 3 0x1100092 bpf pflogd 25402 214559 1 0 3 0x80 sbwait pflogd 63636 28275 65413 73 3 0x1100090 kqread syslogd 65413 3437 1 0 3 0x100082 sbwait syslogd 30645 113085 1 0 3 0x100080 kqread resolvd 52999 252831 32033 77 3 0x100092 kqread dhcpleased 41173 43358 32033 77 3 0x100092 kqread dhcpleased 32033 166817 1 0 3 0x80 kqread dhcpleased 27749 119792 0 0 3 0x14200 bored smr 18915 292547 0 0 2 0x14200 zerothread 24161 154375 0 0 3 0x14200 aiodoned aiodoned 93100 234129 0 0 3 0x14200 syncer update 1450 340044 0 0 3 0x14200 cleaner cleaner 75326 134486 0 0 3 0x14200 reaper reaper 44865 119225 0 0 3 0x14200 pgdaemon pagedaemon 79031 389870 0 0 3 0x14200 bored viomb 69722 111498 0 0 3 0x40014200 acpi0 acpi0 7585 427686 0 0 7 0x40014200 idle1 25819 43501 0 0 3 0x14200 bored softnet1 26398 143035 0 0 3 0x14200 bored softnet0 24919 41279 0 0 3 0x14200 bored systqmp 68972 33458 0 0 3 0x14200 bored systq 5884 4684 0 0 3 0x14200 tmoslp softclockmp 44116 171005 0 0 3 0x40014200 tmoslp softclock 65851 424606 0 0 3 0x40014200 idle0 1 323238 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 49076 (syz-executor) thread 0xffff800031be62d0 (413070) exclusive rwlock vmmaplk r = 0 (0xfffffd806cb09118) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1902 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:699 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:633 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 #7 recall_trap+0x8 Process 31869 (syz-executor) thread 0xffff800031be7a28 (161746) exclusive rwlock fdlock r = 0 (0xffff800039bf5d50) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 doopenat+0x18e sys/kern/vfs_syscalls.c:1105 #3 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #4 Xsyscall+0x128 Process 51744 (syz-executor) thread 0xffff800031be6a98 (29536) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83962370) #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 malloc+0xe3 sys/kern/kern_malloc.c:175 #3 sys_semop+0x22f sys/kern/sysv_sem.c:-1 #4 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #5 Xsyscall+0x128 Process 8934 (syz-executor) thread 0xffff800031be6568 (252928) exclusive rwlock fdlock r = 0 (0xffff800039bf5720) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 doopenat+0x18e sys/kern/vfs_syscalls.c:1105 #3 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #4 Xsyscall+0x128 Process 2832 (syz-executor) thread 0xffff80003c4227f0 (407980) exclusive rwlock vmmaplk r = 0 (0xfffffd806cb094e8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5171 #3 uvmspace_fork+0x44 sys/uvm/uvm_map.c:3732 #4 process_new+0x577 sys/kern/kern_fork.c:281 #5 fork1+0x3f6 sys/kern/kern_fork.c:-1 #6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10215 11109K 11425K 166960K 13375 0 pcb 18 15K 17K 166960K 434 0 rtable 221 11K 11K 166960K 718 0 pf 40 18K 21K 166960K 183 0 ifaddr 39 6K 8K 166960K 128 0 ifgroup 63 2K 3K 166960K 223 0 sysctl 4 1K 9K 166960K 22 0 counters 72 37K 38K 166960K 280 0 ioctlops 0 0K 4K 166960K 1855 0 iov 1 0K 24K 166960K 116 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1358 85K 86K 166960K 2832 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 2K 5K 166960K 17 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 57 0 dirhash 12 2K 2K 166960K 33 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 1695 0 sigio 0 0K 0K 166960K 134 0 proc 76 131K 180K 166960K 800 0 subproc 72 4K 4K 166960K 118 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 188 0 in_multi 78 5K 7K 166960K 203 0 ether_multi 1 0K 0K 166960K 11 0 mrt 0 0K 0K 166960K 12 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 670 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 263 169K 186K 166960K 17020 0 UVM aobj 71 17K 17K 166960K 104 0 pinsyscall 43 86K 102K 166960K 3008 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 1K 166960K 135 0 NDP 13 0K 1K 166960K 89 0 temp 79 8680K 8760K 166960K 82936 0 kqueue 13 20K 32K 166960K 300 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 165 0 162 1 0 1 1 0 8 0 rtentry 176 210 0 126 6 1 5 6 0 8 0 unpcb 144 1304 0 1283 14 12 2 6 0 8 1 syncache 336 10 0 10 4 4 0 1 0 8 0 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 736 506 0 499 15 13 2 7 0 8 1 arp 136 33 0 17 1 0 1 1 0 8 0 inpcb 328 1983 0 1967 19 17 2 7 0 8 0 nd6 152 45 0 27 2 1 1 2 0 8 0 pkpcb 40 4 0 4 3 3 0 1 0 8 0 kcovpl 48 13 0 5 1 0 1 1 0 8 0 ppxss 1192 82 0 81 3 2 1 1 0 8 0 pppxif 1504 41 0 41 3 2 1 1 0 8 1 pffrag 232 17 0 10 1 0 1 1 0 482 0 pffrnode 88 15 0 8 1 0 1 1 0 8 0 pffrent 40 45 0 38 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 pfrktable 1344 1 0 1 1 0 1 1 0 8 1 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pfstitem 24 139 0 68 1 0 1 1 0 8 0 pfstkey 128 139 0 68 3 0 3 3 0 8 0 pfstate 448 139 0 68 10 0 10 10 0 8 0 pfrule 1344 24 0 18 2 1 1 2 0 8 0 rttmr 136 3 0 3 3 3 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 938 0 571 39 15 24 29 0 8 1 art_table 40 942 0 571 6 2 4 5 0 8 0 art_node 32 209 0 136 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 6 1 0 1 1 0 8 0 semupl 112 4 0 4 3 3 0 1 0 8 0 semapl 112 51 0 42 1 0 1 1 0 8 0 shmpl 112 63 0 1 2 0 2 2 0 8 0 dirhash 1024 32 0 15 3 0 3 3 0 8 0 dino2pl 256 4665 0 3154 96 0 96 96 0 8 0 ffsino 296 4665 0 3154 118 0 118 118 0 8 0 nchpl 144 6982 0 5263 64 0 64 64 0 8 0 rtmask 32 10 0 10 4 4 0 1 0 8 0 vnodes 216 5427 0 0 302 0 302 302 0 8 0 namei 1024 23687 0 23687 3 2 1 2 0 8 1 percpumem 16 155 0 104 1 0 1 1 0 8 0 vcpupl 3968 6 0 0 1 0 1 1 0 8 0 vmpool 840 38 0 32 1 0 1 1 0 8 0 kstatmem 264 128 0 98 3 0 3 3 0 8 0 scsiplug 72 10 0 10 3 3 0 1 0 8 0 scxspl 216 40148 0 40148 13 12 1 8 1 8 1 plimitpl 152 661 0 642 1 0 1 1 0 8 0 sigapl 424 2029 0 1981 9 3 6 8 0 8 0 knotepl 120 778 0 0 24 0 24 24 0 8 0 kqueuepl 224 570 0 558 3 2 1 2 0 8 0 pipepl 344 345 0 318 3 0 3 3 0 8 0 fdescpl 528 1991 0 1959 3 0 3 3 0 8 0 filepl 160 13060 0 12822 20 8 12 15 0 8 1 lockfpl 104 818 0 814 2 1 1 2 0 8 0 lockfspl 48 240 0 236 1 0 1 1 0 8 0 sessionpl 144 35 0 26 1 0 1 1 0 8 0 pgrppl 48 124 0 107 1 0 1 1 0 8 0 ucredpl 104 2274 0 2261 1 0 1 1 0 8 0 zombiepl 144 2312 0 2312 1 0 1 1 0 8 1 processpl 1232 2029 0 1981 7 3 4 6 0 8 0 procpl 664 4590 0 4526 8 2 6 8 0 8 0 sosppl 176 21 0 21 4 4 0 1 0 8 0 sockpl 752 3563 0 3523 32 27 5 16 0 8 0 mcl64k 65536 18 0 0 3 0 3 3 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 112 0 0 14 0 14 14 0 8 0 mcl2k 2048 33 0 0 4 0 4 4 0 8 0 mtagpl 96 62 0 0 2 0 2 2 0 8 0 mbufpl 256 1867 0 0 116 0 116 116 0 8 0 bufpl 280 15305 0 9168 439 0 439 439 0 8 0 anonpl 32 16148 0 0 130 0 130 130 0 246 0 amapchunkpl 152 59239 0 58651 51 21 30 38 0 158 4 amappl16 200 7225 0 7105 58 32 26 32 0 8 8 amappl15 192 6 0 6 2 2 0 1 0 8 0 amappl14 184 11 0 11 2 2 0 1 0 8 0 amappl13 176 496 0 495 1 0 1 1 0 8 0 amappl12 168 2460 0 2418 3 0 3 3 0 8 0 amappl11 160 14 0 14 2 2 0 1 0 8 0 amappl10 152 51 0 37 1 0 1 1 0 8 0 amappl9 144 263 0 263 1 1 0 1 0 8 0 amappl8 136 26 0 23 1 0 1 1 0 8 0 amappl7 128 102 0 100 1 0 1 1 0 8 0 amappl6 120 350 0 336 1 0 1 1 0 8 0 amappl5 112 86 0 75 1 0 1 1 0 8 0 amappl4 104 546 0 516 1 0 1 1 0 8 0 amappl3 96 10210 0 10113 4 1 3 3 0 8 0 amappl2 88 2144 0 2067 2 0 2 2 0 8 0 amappl1 80 17812 0 17224 17 2 15 16 0 8 0 amappl 88 15866 0 15683 5 0 5 5 0 92 0 uvmvnodes 80 167 0 0 4 0 4 4 0 8 0 dma16384 16384 1 0 1 1 1 0 1 0 8 0 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 3 0 3 3 3 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 255 0 255 3 3 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 72 103 0 33 2 0 2 2 0 8 0 uaddrrnd 24 1990 0 1959 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1990 0 1959 1 0 1 1 0 8 0 vmmpekpl 168 16937 0 16888 3 0 3 3 0 8 0 vmmpepl 168 134796 0 132758 126 16 110 110 0 357 7 vmsppl 488 1990 0 1959 5 0 5 5 0 8 0 rwobjpl 80 37618 0 36344 38 1 37 37 0 8 3 pdppl 4096 4064 0 3988 128 50 78 86 0 8 2 pvpl 32 24023 0 0 193 0 193 193 0 265 0 pmappl 256 2028 0 1991 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 452 0 91 11 0 11 11 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff800031be6a98,ffff80003a801380,ffff80003a8012d0) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003a801380) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a801380) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a47210dce0, count: -3 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299edff0) 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 acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffff8000299edff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: -5