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(ffff80003c4a4560,ffff80003c483120,ffff80003c483070) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003c483120) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c483120) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4067e1b36e0, count: -3 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003c483040 rbx 0xdeaf4152deaf4152 rdx 0 rcx 0xffff80003c4a4560 rax 0xdeaf4152deaf4152 r8 0x7f7fffffc000 r9 0xfffffd80097fb3a8 r10 0x94eb5492b634ee34 r11 0x9d3dfc42fff5d5e r12 0 r13 0xfffffd805eedfd20 r14 0xffff80003c483120 r15 0 rip 0xffffffff8182ebc5 sys_semop+0x3d5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c482f50 ss 0x10 sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{0}> show proc PROC (syz-executor) tid=96968 pid=67084 tcnt=4 stat=onproc flags process=10 proc=4000000 runpri=4, usrpri=50, slppri=4, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c4a4030,0xffff80003c4a4fd0 process=0xffff80003b029d08 user=0xffff80003c47e000, vmspace=0xfffffd8068bedba0 estcpu=32, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 67084 228639 96068 32767 2 0x10 syz-executor 67084 265998 96068 32767 3 0x4000090 fsleep syz-executor *67084 96968 96068 32767 7 0x4000010 syz-executor 67084 463310 96068 32767 2 0x4000010 syz-executor 96712 523444 27239 32767 2 0x10 syz-executor 96712 165228 27239 32767 3 0x4000090 fsleep syz-executor 43549 318745 80750 32767 2 0x10 syz-executor 43549 276085 80750 32767 7 0x4000010 syz-executor 86272 214406 85834 32767 2 0xc90 syz-executor 86272 263636 85834 32767 3 0x4000090 lockf syz-executor 86272 521052 85834 32767 3 0x4000090 fsleep syz-executor 43108 267357 17322 32767 2 0xc90 syz-executor 43108 404916 17322 32767 3 0x4000090 kqread syz-executor 43108 311082 17322 32767 3 0x4000090 fsleep syz-executor 89703 124599 48704 0 2 0x10000080 syz-executor 96068 240033 69527 32767 2 0xc90 syz-executor 27239 97799 96710 32767 2 0xc90 syz-executor 80750 393055 94104 32767 2 0xc90 syz-executor 85834 32669 15025 32767 2 0xc90 syz-executor 17322 312359 82325 32767 2 0xc90 syz-executor 56707 351593 68210 32767 2 0x10000c90 syz-executor 94104 501759 23104 0 3 0x82 wait syz-executor 69527 148946 23104 0 3 0x82 wait syz-executor 82325 287818 23104 0 3 0x82 wait syz-executor 96710 35672 23104 0 3 0x82 wait syz-executor 48704 499377 23104 0 3 0x82 wait syz-executor 78985 420859 23104 0 3 0x82 wait syz-executor 68210 91686 23104 0 3 0x82 wait syz-executor 15025 148028 23104 0 3 0x82 wait syz-executor 23104 410415 8254 0 3 0x82 kqread syz-executor 8254 154989 75117 0 3 0x10008a sigsusp ksh 75117 415829 13620 0 3 0x98 kqread sshd-session 13620 208416 48247 0 3 0x92 kqread sshd-session 80089 39674 1 0 3 0x100083 ttyin getty 48247 136843 1 0 3 0x88 kqread sshd 97365 444304 55741 73 3 0x1100090 kqread syslogd 55741 413830 1 0 3 0x100082 sbwait syslogd 26552 455653 1 0 3 0x100080 kqread resolvd 75221 84498 37661 77 3 0x100092 kqread dhcpleased 83564 396801 37661 77 3 0x100092 kqread dhcpleased 37661 509002 1 0 3 0x80 kqread dhcpleased 75323 467587 0 0 2 0x40014200 smr 43176 240622 0 0 2 0x14200 zerothread 87241 223256 0 0 3 0x14200 aiodoned aiodoned 19335 450065 0 0 3 0x14200 syncer update 73701 9694 0 0 3 0x14200 cleaner cleaner 18464 284756 0 0 3 0x14200 reaper reaper 76043 208621 0 0 3 0x14200 pgdaemon pagedaemon 91464 260946 0 0 3 0x14200 bored viomb 21565 287558 0 0 3 0x40014200 acpi0 acpi0 5817 227573 0 0 3 0x40014200 idle1 23855 2450 0 0 3 0x14200 bored softnet7 79382 41272 0 0 3 0x14200 bored softnet6 79816 256980 0 0 3 0x14200 bored softnet5 25599 329015 0 0 3 0x14200 bored softnet4 32593 103721 0 0 3 0x14200 bored softnet3 42590 2844 0 0 3 0x14200 bored softnet2 22241 448811 0 0 3 0x14200 bored softnet1 15225 229166 0 0 3 0x14200 bored softnet0 58464 373397 0 0 3 0x14200 smrbar systqmp 65183 191874 0 0 3 0x14200 bored systq 32121 509526 0 0 2 0x14200 softclockmp 57261 114352 0 0 3 0x40014200 tmoslp softclock 78224 22736 0 0 3 0x40014200 idle0 1 337633 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 67084 (syz-executor) thread 0xffff80003c4a4560 (96968) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83921f80) #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:367 #3 uvm_fault_lower_io+0x381 sys/uvm/uvm_fault.c:1662 #4 uvm_fault_lower+0x2bb sys/uvm/uvm_fault.c:1419 #5 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #6 kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283 #7 kerntrap+0x198 sys/arch/amd64/amd64/trap.c:491 #8 alltraps_kern_meltdown+0x7b #9 _copyin+0x57 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #11 Xsyscall+0x128 Process 43549 (syz-executor) thread 0xffff80003c4a4d28 (276085) shared rwlock vmmaplk r = 0 (0xfffffd8068bed500) #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 Process 58464 (systqmp) thread 0xffff8000ffffe530 (373397) shared rwlock systqmp r = 0 (0xffffffff8385c158) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10188 10955K 10968K 166960K 11266 0 pcb 17 12K 12K 166960K 17 0 rtable 205 5K 5K 166960K 259 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 29 0 iov 0 0K 0K 166960K 1 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1352 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 3 0K 0K 166960K 4 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 23 85K 129K 166960K 154 0 proc 58 99K 163K 166960K 474 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 1 0 in_multi 99 7K 7K 166960K 101 0 ether_multi 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 37 175K 175K 166960K 37 0 exec 0 0K 1K 166960K 348 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 240 161K 172K 166960K 3014 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 44 88K 116K 166960K 1191 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 27 2K 2K 166960K 27 0 temp 34 8638K 8702K 166960K 3783 0 kqueue 13 20K 22K 166960K 22 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 37 0 34 1 0 1 1 0 8 0 rtentry 176 95 0 1 5 0 5 5 0 8 0 unpcb 144 43 0 27 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 13 0 8 1 0 1 1 0 8 0 arp 128 10 0 0 1 0 1 1 0 8 0 inpcb 328 64 0 56 2 0 2 2 0 8 1 nd6 144 16 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 256 437 0 0 28 0 28 28 0 8 0 art_table 40 438 0 0 5 0 5 5 0 8 0 art_node 32 95 0 10 1 0 1 1 0 8 0 semapl 112 1 0 1 1 0 1 1 0 8 1 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1558 0 52 95 0 95 95 0 8 0 ffsino 296 1558 0 52 116 0 116 116 0 8 0 nchpl 144 1754 0 72 63 0 63 63 0 8 0 uvmvnodes 80 1639 0 0 34 0 34 34 0 8 0 vnodes 216 1639 0 0 92 0 92 92 0 8 0 namei 1024 5205 0 5205 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 6359 0 6359 3 1 2 2 1 8 2 plimitpl 152 100 0 76 2 0 2 2 0 8 1 sigapl 424 441 0 382 8 0 8 8 0 8 0 knotepl 120 297 0 0 9 0 9 9 0 8 0 kqueuepl 224 21 0 10 1 0 1 1 0 8 0 pipepl 344 101 0 73 3 0 3 3 0 8 0 fdescpl 528 419 0 384 4 0 4 4 0 8 0 filepl 160 1406 0 1190 11 1 10 10 0 8 1 lockfpl 104 9 0 5 1 0 1 1 0 8 0 lockfspl 48 5 0 2 1 0 1 1 0 8 0 sessionpl 144 22 0 6 1 0 1 1 0 8 0 pgrppl 48 30 0 6 1 0 1 1 0 8 0 ucredpl 104 103 0 85 1 0 1 1 0 8 0 zombiepl 144 385 0 382 1 0 1 1 0 8 0 processpl 1232 441 0 382 7 1 6 6 0 8 0 procpl 664 469 0 401 7 0 7 7 0 8 0 sockpl 752 144 0 116 4 0 4 4 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 15 0 0 2 0 2 2 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 164 0 0 11 0 11 11 0 8 0 bufpl 280 2830 0 116 194 0 194 194 0 8 0 anonpl 32 7546 0 0 62 0 62 62 0 246 1 amapchunkpl 152 8572 0 7935 29 2 27 27 0 158 2 amappl16 200 1978 0 1952 14 0 14 14 0 8 12 amappl15 192 7 0 7 1 0 1 1 0 8 1 amappl14 184 106 0 96 1 0 1 1 0 8 0 amappl13 176 3 0 3 1 0 1 1 0 8 1 amappl12 168 1037 0 1003 2 0 2 2 0 8 0 amappl11 160 43 0 33 1 0 1 1 0 8 0 amappl10 152 5 0 4 1 0 1 1 0 8 0 amappl9 144 262 0 262 1 0 1 1 0 8 1 amappl8 136 19 0 18 1 0 1 1 0 8 0 amappl7 128 96 0 86 1 0 1 1 0 8 0 amappl6 120 168 0 165 1 0 1 1 0 8 0 amappl5 112 110 0 104 1 0 1 1 0 8 0 amappl4 104 282 0 268 1 0 1 1 0 8 0 amappl3 96 1241 0 1122 4 0 4 4 0 8 0 amappl2 88 613 0 559 2 0 2 2 0 8 0 amappl1 80 8139 0 7568 15 0 15 15 0 8 0 amappl 88 2371 0 2195 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 419 0 384 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 419 0 384 1 0 1 1 0 8 0 vmmpekpl 168 4950 0 4916 2 0 2 2 0 8 0 vmmpepl 168 33620 0 31614 110 0 110 110 0 357 10 vmsppl 488 418 0 384 7 1 6 6 0 8 0 rwobjpl 80 13976 0 11497 59 0 59 59 0 8 2 pdppl 4096 846 0 768 114 14 100 100 0 8 22 pvpl 32 14924 0 0 121 0 121 121 0 265 0 pmappl 256 418 0 384 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 281 0 17 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff80003c4a4560,ffff80003c483120,ffff80003c483070) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003c483120) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c483120) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4067e1b36e0, 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x78 kd_claim sys/dev/kcov.c:626 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x78 sys/dev/kcov.c:157 stacktrace_save_at(fffffd80045104a0,0) at stacktrace_save_at+0xe5 sys/arch/amd64/amd64/db_trace.c:274 witness_lock(fffffd8068bed500,1) at witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] witness_lock(fffffd8068bed500,1) at witness_lock+0x5f1 sys/kern/subr_witness.c:1160 rw_do_enter_read(fffffd8068bed4e8,0) at rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413 uvmfault_lookup(ffff80003b025130,0) at uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1924 uvm_fault_check(ffff80003b025130,ffff80003b025168,ffff80003b0251a0,0) at uvm_fault_check+0x4a sys/uvm/uvm_fault.c:741 uvm_fault(fffffd8068bed400,c2000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:677 kpageflttrap(ffff80003b0252e0,c2920) at kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283 kerntrap(ffff80003b0252e0) at kerntrap+0x198 sys/arch/amd64/amd64/trap.c:491 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x57 syscall(ffff80003b025720) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003b025720) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb91ced261f0, count: -16