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(ffff800033408fb0,ffff80003c447f00,ffff80003c447e50) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80003c447f00) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c447f00) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x394ecb44a30, count: -3 ddb{1}> show registers rdi 0 rsi 0xb rbp 0xffff80003c447e20 rbx 0xdeaf4152deaf4152 rdx 0 rcx 0xffff800033408fb0 rax 0xffff8000299edff0 r8 0x7f7fffffc000 r9 0x1 r10 0x59519295d806f84d r11 0x9bbc43722a98f00f r12 0xb r13 0xfffffd8064483a10 r14 0xffff80003c447f00 r15 0xb rip 0xffffffff827d2a32 sys_semop+0x352 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c447d30 ss 0x10 sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> show proc PROC (syz-executor) tid=136955 pid=28832 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800033409248,0xffff800033409cb8 process=0xffff80003c4261d0 user=0xffff80003c442000, vmspace=0xfffffd806b9b9d70 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 28832 61568 46124 0 2 0 syz-executor *28832 136955 46124 0 7 0x4000000 syz-executor 28832 293311 46124 0 3 0x4000080 fsleep syz-executor 3924 160321 47692 0 7 0 syz-executor 3924 46406 47692 0 3 0x4000080 fsleep syz-executor 31092 82101 79822 0 3 0x80 fsleep syz-executor 31092 381673 79822 0 3 0x4000080 ttyout syz-executor 24624 43542 44140 0 3 0x80 fsleep syz-executor 24624 38887 44140 0 3 0x4000080 ttyin syz-executor 24624 245605 44140 0 3 0x4000080 fsleep syz-executor 76413 5201 90955 0 3 0x80 fsleep syz-executor 76413 318371 90955 0 3 0x4000080 lockf syz-executor 41836 493594 47493 60929 3 0x90 fsleep syz-executor 41836 248957 47493 60929 3 0x4000090 kqsel syz-executor 41836 384679 47493 60929 3 0x4000090 fsleep syz-executor 41836 188522 47493 60929 3 0x4000090 fsleep syz-executor 29019 314131 73034 0 3 0x80 fsleep syz-executor 29019 350969 73034 0 3 0x4000080 fsleep syz-executor 29019 17596 73034 0 3 0x4000080 fifor syz-executor 29019 68277 73034 0 3 0x4000080 fifor syz-executor 17143 206272 0 0 3 0x14200 bored sosplice 47692 162212 60942 0 3 0x82 nanoslp syz-executor 79822 343391 60942 0 3 0x82 nanoslp syz-executor 53605 235242 60942 0 3 0x82 wait syz-executor 44140 468507 60942 0 3 0x82 nanoslp syz-executor 47493 290817 60942 0 3 0x82 nanoslp syz-executor 90955 86083 60942 0 3 0x82 nanoslp syz-executor 73034 65503 60942 0 3 0x82 nanoslp syz-executor 46124 479795 60942 0 3 0x82 nanoslp syz-executor 60942 255168 95882 0 3 0x82 kqread syz-executor 95882 488549 44227 0 3 0x10008a sigsusp ksh 44227 299468 45187 0 3 0x98 kqread sshd-session 45187 447497 46514 0 3 0x92 kqread sshd-session 40569 391546 1 0 3 0x100083 ttyopn getty 46514 448039 1 0 3 0x88 kqread sshd 79464 374954 25783 74 3 0x1100092 bpf pflogd 25783 252127 1 0 3 0x80 sbwait pflogd 19478 137215 34161 73 3 0x1100090 kqread syslogd 34161 508825 1 0 3 0x100082 sbwait syslogd 21998 360071 1 0 3 0x100080 kqread resolvd 408 139997 74813 77 3 0x100092 kqread dhcpleased 29892 329563 74813 77 3 0x100092 kqread dhcpleased 74813 513986 1 0 3 0x80 kqread dhcpleased 33406 155604 0 0 3 0x14200 bored smr 98879 167059 0 0 3 0x14200 pgzero zerothread 3898 12253 0 0 3 0x14200 aiodoned aiodoned 57905 76609 0 0 3 0x14200 syncer update 9746 374185 0 0 3 0x14200 cleaner cleaner 63388 14578 0 0 3 0x14200 reaper reaper 29189 185141 0 0 3 0x14200 pgdaemon pagedaemon 69200 252385 0 0 3 0x14200 bored viomb 61968 107415 0 0 3 0x40014200 acpi0 acpi0 62077 238696 0 0 3 0x40014200 idle1 61409 371001 0 0 3 0x14200 bored softnet7 77421 162857 0 0 3 0x14200 bored softnet6 62968 133688 0 0 3 0x14200 bored softnet5 87536 209499 0 0 3 0x14200 bored softnet4 74381 454795 0 0 3 0x14200 bored softnet3 88332 22898 0 0 3 0x14200 bored softnet2 7689 308647 0 0 3 0x14200 bored softnet1 53220 78761 0 0 3 0x14200 bored softnet0 81148 101387 0 0 3 0x14200 bored systqmp 4825 281488 0 0 3 0x14200 bored systq 75892 136504 0 0 3 0x14200 tmoslp softclockmp 83984 132634 0 0 3 0x40014200 tmoslp softclock 98350 221792 0 0 3 0x40014200 idle0 1 401685 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 28832 (syz-executor) thread 0xffff800033408fb0 (136955) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839a9350) #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:174 #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:746 #5 Xsyscall+0x128 Process 3924 (syz-executor) thread 0xffff800033408d18 (160321) exclusive rwlock uobjlk r = 0 (0xfffffd806b9b37b8) #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 uvm_fault+0x1e5 sys/uvm/uvm_fault.c:699 #3 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #4 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:603 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806b9b9aa0) #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:1924 #3 uvm_fault_check+0x4a sys/uvm/uvm_fault.c:741 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:603 #7 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10234 11044K 11646K 166960K 12176 0 pcb 17 16K 18K 166960K 305 0 rtable 214 10K 10K 166960K 393 0 pf 37 18K 131090K 166960K 246 0 ifaddr 41 7K 7K 166960K 96 0 ifgroup 55 2K 2K 166960K 168 0 sysctl 4 1K 9K 166960K 18 0 counters 68 36K 38K 166960K 178 0 ioctlops 0 0K 8K 166960K 1839 0 iov 1 8K 32K 166960K 132 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1398 88K 89K 166960K 2153 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 9K 166960K 20 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 60 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 1114 0 sigio 0 0K 0K 166960K 44 0 proc 72 115K 196K 166960K 639 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 118 0 in_multi 85 6K 7K 166960K 156 0 ether_multi 1 0K 0K 166960K 15 0 mrt 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 193 864K 864K 166960K 193 0 exec 0 0K 1K 166960K 477 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 6 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 254 161K 172K 166960K 12174 0 UVM aobj 38 3K 5K 166960K 40 0 pinsyscall 43 86K 102K 166960K 2237 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 87 0 NDP 12 0K 1K 166960K 66 0 temp 79 8652K 8728K 166960K 53412 0 kqueue 13 20K 35K 166960K 241 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 120 102 0 99 1 0 1 1 0 8 0 rtentry 176 124 0 39 5 0 5 5 0 8 0 unpcb 144 646 0 625 6 5 1 4 0 8 0 syncache 336 6 0 6 1 1 0 1 0 8 0 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 736 332 0 327 2 1 1 2 0 8 0 arp 136 20 0 3 1 0 1 1 0 8 0 inpcb 328 1234 0 1191 17 13 4 7 0 8 0 nd6 144 20 0 3 1 0 1 1 0 8 0 pkpcb 40 16 0 16 3 3 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 43 0 43 4 3 1 1 0 8 1 pppxif 1504 2 0 2 2 2 0 1 0 8 0 pfstscr 40 3 0 2 1 0 1 1 0 8 0 pffrag 232 9 0 4 1 0 1 1 0 482 0 pffrnode 88 9 0 4 1 0 1 1 0 8 0 pffrent 40 80 0 75 1 0 1 1 0 8 0 pfosfp 40 1429 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1429 0 714 21 0 21 21 0 8 0 pfrktable 1344 3 0 1 1 0 1 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 2 0 1 1 0 1 1 0 8 0 pfstitem 24 84 0 40 1 0 1 1 0 8 0 pfstkey 128 86 0 42 2 0 2 2 0 8 0 pfstate 384 84 0 41 6 0 6 6 0 8 0 pfrule 1344 33 0 27 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 515 0 152 29 3 26 29 0 8 0 art_table 40 518 0 152 5 0 5 5 0 8 0 art_node 32 123 0 54 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 8 1 0 1 1 0 8 0 semapl 112 52 0 43 1 0 1 1 0 8 0 shmpl 112 37 0 2 1 0 1 1 0 8 0 dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 3475 0 1969 95 0 95 95 0 8 0 ffsino 296 3475 0 1969 117 0 117 117 0 8 0 nchpl 144 5155 0 4619 64 37 27 64 0 8 3 rtmask 32 7 0 7 3 3 0 1 0 8 0 uvmvnodes 80 3936 0 0 81 0 81 81 0 8 0 vnodes 216 3936 0 0 219 0 219 219 0 8 0 namei 1024 17972 0 17972 3 2 1 2 0 8 1 percpumem 16 104 0 55 1 0 1 1 0 8 0 kstatmem 264 102 0 76 5 2 3 3 0 8 1 scsiplug 72 3 0 3 2 2 0 1 0 8 0 scxspl 216 35178 0 35178 12 9 3 8 1 8 3 plimitpl 152 352 0 332 1 0 1 1 0 8 0 sigapl 424 1430 0 1375 7 0 7 7 0 8 0 knotepl 120 342 0 0 10 0 10 10 0 8 0 kqueuepl 224 516 0 506 7 6 1 5 0 8 0 pipepl 344 205 0 178 3 0 3 3 0 8 0 fdescpl 528 1406 0 1374 3 0 3 3 0 8 0 filepl 160 9077 0 8815 22 9 13 13 0 8 1 lockfpl 104 474 0 470 1 0 1 1 0 8 0 lockfspl 48 175 0 172 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 54 0 37 1 0 1 1 0 8 0 ucredpl 104 1377 0 1363 1 0 1 1 0 8 0 zombiepl 144 1770 0 1769 1 0 1 1 0 8 0 processpl 1232 1430 0 1375 5 0 5 5 0 8 0 procpl 664 3165 0 3097 8 2 6 7 0 8 0 sosppl 168 6 0 6 3 3 0 1 0 8 0 sockpl 752 2101 0 2034 24 16 8 11 0 8 0 mcl64k 65536 18 0 0 3 0 3 3 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 8 0 0 1 0 1 1 0 8 0 mcl4k 4096 121 0 0 15 0 15 15 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 65 0 0 7 0 7 7 0 8 0 mtagpl 96 13 0 0 1 0 1 1 0 8 0 mbufpl 256 254 0 0 16 0 16 16 0 8 0 bufpl 280 14581 0 8438 440 0 440 440 0 8 0 anonpl 32 11024 0 0 89 0 89 89 0 246 0 amapchunkpl 152 40399 0 39843 41 15 26 29 0 158 2 amappl16 200 6022 0 5745 53 38 15 26 0 8 0 amappl15 192 77 0 77 1 1 0 1 0 8 0 amappl14 184 119 0 106 1 0 1 1 0 8 0 amappl13 176 5 0 5 1 1 0 1 0 8 0 amappl12 168 2070 0 2038 4 2 2 3 0 8 0 amappl11 160 56 0 42 1 0 1 1 0 8 0 amappl10 152 29 0 29 1 1 0 1 0 8 0 amappl9 144 250 0 250 1 1 0 1 0 8 0 amappl8 136 27 0 24 1 0 1 1 0 8 0 amappl7 128 112 0 100 1 0 1 1 0 8 0 amappl6 120 274 0 270 1 0 1 1 0 8 0 amappl5 112 122 0 111 1 0 1 1 0 8 0 amappl4 104 331 0 310 1 0 1 1 0 8 0 amappl3 96 7073 0 6964 3 0 3 3 0 8 0 amappl2 88 1683 0 1598 2 0 2 2 0 8 0 amappl1 80 13012 0 12402 15 0 15 15 0 8 0 amappl 88 11270 0 11089 5 0 5 5 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma256 256 7 0 7 2 2 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 20 0 19 1 0 1 1 0 8 0 aobjpl 72 39 0 2 1 0 1 1 0 8 0 uaddrrnd 24 1406 0 1374 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1406 0 1374 1 0 1 1 0 8 0 vmmpekpl 168 12805 0 12771 3 0 3 3 0 8 0 vmmpepl 168 94881 0 92558 122 18 104 110 0 357 3 vmsppl 488 1405 0 1374 5 1 4 5 0 8 0 rwobjpl 80 31629 0 26444 108 2 106 106 0 8 0 pdppl 4096 2820 0 2748 118 46 72 86 0 8 0 pvpl 32 18799 0 0 151 0 151 151 0 265 0 pmappl 256 1405 0 1374 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 305 0 57 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(ffffffff837e3ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x44 sys/dev/kcov.c:159 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc uvm_fault(fffffd806b9b99a0,e36888ef000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:700 upageflttrap(ffff80003c4393b0,e36888ef000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c4393b0) at usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:603 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x732a5de7fbd0, count: -12 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> trace sys_semop(ffff800033408fb0,ffff80003c447f00,ffff80003c447e50) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80003c447f00) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c447f00) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x394ecb44a30, count: -3