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(ffff8000fffde560,ffff80002a354a40,ffff80002a354990) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80002a354a40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a354a40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1a08d391100, count: -3 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002a354960 rbx 0xdeaf4152deaf4152 rdx 0 rcx 0xffff8000fffde560 rax 0xdeaf4152deaf4152 r8 0x7f7fffffc000 r9 0xfffffd80097fb068 r10 0x5665926b6f1c6ace r11 0x374705419447c0b8 r12 0 r13 0xfffffd806b46b7e0 r14 0xffff80002a354a40 r15 0 rip 0xffffffff8247c9b5 sys_semop+0x3d5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a354870 ss 0x10 sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{0}> show proc PROC (syz-executor) tid=133524 pid=72028 tcnt=4 stat=onproc flags process=10 proc=4000000 runpri=36, usrpri=50, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffdf788,0xffff8000fffdfa30 process=0xffff8000fffe09c0 user=0xffff80002a34f000, vmspace=0xfffffd806b910ba0 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 82939 465515 84768 0 2 0 syz-executor 72028 200861 91772 32767 2 0x10 syz-executor *72028 133524 91772 32767 7 0x4000010 syz-executor 72028 82109 91772 32767 7 0x4000010 syz-executor 72028 468881 91772 32767 3 0x4000090 fsleep syz-executor 62627 441984 0 0 3 0x14200 bored sosplice 91772 96169 93939 32767 2 0xc90 syz-executor 33222 35978 2369 32767 3 0x90 nanoslp syz-executor 60485 140346 63136 32767 2 0x10 syz-executor 51370 519167 82704 32767 3 0x90 piperd syz-executor 61833 18932 21415 32767 3 0x90 piperd syz-executor 34594 517586 3097 32767 2 0xc90 syz-executor 93939 127612 84768 0 3 0x82 wait syz-executor 82704 248018 84768 0 3 0x82 wait syz-executor 2369 509712 84768 0 3 0x82 wait syz-executor 63136 459191 84768 0 3 0x82 wait syz-executor 3097 364190 84768 0 3 0x82 wait syz-executor 21415 272451 84768 0 3 0x82 wait syz-executor 84768 229600 56209 0 3 0x82 nanoslp syz-executor 56209 517635 73334 0 3 0x10008a sigsusp ksh 73334 259264 71261 0 3 0x98 kqread sshd-session 71261 92032 52498 0 3 0x92 kqread sshd-session 89290 391873 1 0 3 0x100083 ttyin getty 52498 506384 1 0 3 0x88 kqread sshd 4851 87156 13590 73 3 0x1100090 kqread syslogd 13590 517608 1 0 3 0x100082 sbwait syslogd 15778 243915 1 0 3 0x100080 kqread resolvd 8379 434947 95776 77 3 0x100092 kqread dhcpleased 23125 443711 95776 77 3 0x100092 kqread dhcpleased 95776 73199 1 0 3 0x80 kqread dhcpleased 99605 47998 0 0 3 0x14200 bored smr 90644 216133 0 0 2 0x14200 zerothread 38035 269037 0 0 3 0x14200 aiodoned aiodoned 90313 80061 0 0 3 0x14200 syncer update 47587 512999 0 0 3 0x14200 cleaner cleaner 91232 1208 0 0 3 0x14200 reaper reaper 43408 500243 0 0 3 0x14200 pgdaemon pagedaemon 15532 416262 0 0 3 0x14200 bored viomb 45320 270661 0 0 3 0x40014200 acpi0 acpi0 98984 409835 0 0 3 0x40014200 idle1 21192 87145 0 0 3 0x14200 bored softnet1 95388 43370 0 0 3 0x14200 bored softnet0 62180 507486 0 0 3 0x14200 bored systqmp 71196 505024 0 0 3 0x14200 bored systq 62269 144571 0 0 3 0x14200 tmoslp softclockmp 61660 412054 0 0 3 0x40014200 tmoslp softclock 74866 375019 0 0 3 0x40014200 idle0 1 180207 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 72028 (syz-executor) thread 0xffff8000fffde560 (133524) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838d7368) #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 rw_do_enter_read+0x309 sys/kern/kern_rwlock.c:-1 #4 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1924 #5 uvm_fault_check+0x4a sys/uvm/uvm_fault.c:741 #6 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #7 kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283 #8 kerntrap+0x198 sys/arch/amd64/amd64/trap.c:489 #9 alltraps_kern_meltdown+0x7b #10 _copyin+0x5b #11 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 #12 Xsyscall+0x128 Process 72028 (syz-executor) thread 0xffff8000fffdfa20 (82109) shared rwlock vmmaplk r = 0 (0xfffffd806b910ca0) #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 kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283 #6 kerntrap+0x198 sys/arch/amd64/amd64/trap.c:489 #7 alltraps_kern_meltdown+0x7b #8 copyout+0x64 #9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #10 Xsyscall+0x128 Process 60485 (syz-executor) thread 0xffff8000fffee7e0 (140346) exclusive rrwlock inode r = 0 (0xfffffd806b823460) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3113 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c2037b8) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3098 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10186 10951K 10966K 166960K 11276 0 pcb 17 12K 12K 166960K 17 0 rtable 169 4K 6K 166960K 267 0 pf 27 16K 16K 166960K 31 0 ifaddr 34 6K 7K 166960K 44 0 ifgroup 42 1K 2K 166960K 50 0 sysctl 3 1K 9K 166960K 7 0 counters 64 36K 36K 166960K 68 0 ioctlops 0 0K 2K 166960K 33 0 iov 0 0K 16K 166960K 12 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1562 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 8 0 VM map 2 1K 1K 166960K 2 0 sem 11 0K 0K 166960K 12 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 62K 121K 166960K 373 0 sigio 0 0K 0K 166960K 5 0 proc 58 99K 131K 166960K 484 0 subproc 54 3K 4K 166960K 243 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 23 0 in_multi 77 5K 7K 166960K 104 0 ether_multi 1 0K 0K 166960K 3 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 91 413K 413K 166960K 91 0 exec 0 0K 1K 166960K 376 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 209 134K 167K 166960K 4493 0 UVM aobj 12 2K 2K 166960K 12 0 pinsyscall 39 78K 112K 166960K 1413 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 11 0 NDP 9 0K 2K 166960K 27 0 temp 32 8639K 8703K 166960K 7444 0 kqueue 16 22K 26K 166960K 62 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 47 0 44 1 0 1 1 0 8 0 rtentry 176 98 0 22 5 0 5 5 0 8 0 unpcb 144 116 0 101 1 0 1 1 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 101 0 96 4 0 4 4 0 8 3 arp 136 10 0 2 1 0 1 1 0 8 0 ipq 40 2 0 2 1 0 1 1 0 8 1 ipqe 40 4 0 4 1 0 1 1 0 8 1 inpcb 328 234 0 226 5 0 5 5 0 8 4 nd6 144 19 0 7 1 0 1 1 0 8 0 kcovpl 48 27 0 21 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 449 0 97 29 0 29 29 0 8 5 art_table 40 450 0 97 5 0 5 5 0 8 0 art_node 32 98 0 30 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 2 1 0 1 1 0 8 0 semapl 112 9 0 1 1 0 1 1 0 8 0 shmpl 112 9 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1808 0 282 96 0 96 96 0 8 0 ffsino 296 1808 0 282 118 0 118 118 0 8 0 nchpl 144 2204 0 510 63 0 63 63 0 8 0 uvmvnodes 80 2060 0 0 43 0 43 43 0 8 0 vnodes 216 2060 0 0 115 0 115 115 0 8 0 namei 1024 6843 0 6842 1 0 1 1 0 8 0 percpumem 16 49 0 2 1 0 1 1 0 8 0 kstatmem 264 24 0 4 2 0 2 2 0 8 0 scxspl 216 7592 0 7592 4 1 3 3 1 8 3 plimitpl 152 105 0 84 2 0 2 2 0 8 1 sigapl 424 618 0 571 7 0 7 7 0 8 0 knotepl 120 305 0 0 10 0 10 10 0 8 0 kqueuepl 224 133 0 123 5 0 5 5 0 8 4 pipepl 344 178 0 147 4 0 4 4 0 8 0 fdescpl 528 601 0 571 3 0 3 3 0 8 0 filepl 160 2702 0 2506 12 0 12 12 0 8 2 lockfpl 104 42 0 40 1 0 1 1 0 8 0 lockfspl 48 15 0 13 1 0 1 1 0 8 0 sessionpl 144 41 0 27 1 0 1 1 0 8 0 pgrppl 48 70 0 50 1 0 1 1 0 8 0 ucredpl 104 454 0 437 1 0 1 1 0 8 0 zombiepl 144 573 0 571 1 0 1 1 0 8 0 processpl 1232 618 0 571 5 0 5 5 0 8 0 procpl 664 898 0 848 7 0 7 7 0 8 0 sockpl 752 401 0 375 8 0 8 8 0 8 5 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 126 0 0 16 0 16 16 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 250 0 0 16 0 16 16 0 8 0 bufpl 280 3167 0 116 218 0 218 218 0 8 0 anonpl 32 8273 0 0 67 0 67 67 0 246 0 amapchunkpl 152 14177 0 13681 31 1 30 30 0 158 5 amappl16 200 2245 0 2192 14 2 12 14 0 8 8 amappl15 192 10 0 10 1 1 0 1 0 8 0 amappl14 184 106 0 96 1 0 1 1 0 8 0 amappl13 176 5 0 5 2 1 1 1 0 8 1 amappl12 168 1216 0 1186 2 0 2 2 0 8 0 amappl11 160 46 0 36 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 247 0 247 1 1 0 1 0 8 0 amappl8 136 20 0 18 1 0 1 1 0 8 0 amappl7 128 96 0 86 1 0 1 1 0 8 0 amappl6 120 178 0 174 1 0 1 1 0 8 0 amappl5 112 116 0 110 1 0 1 1 0 8 0 amappl4 104 278 0 261 1 0 1 1 0 8 0 amappl3 96 2150 0 2068 4 0 4 4 0 8 0 amappl2 88 834 0 761 2 0 2 2 0 8 0 amappl1 80 8954 0 8415 14 0 14 14 0 8 0 amappl 88 3794 0 3646 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 11 0 0 1 0 1 1 0 8 0 uaddrrnd 24 601 0 571 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 601 0 571 1 0 1 1 0 8 0 vmmpekpl 168 6658 0 6601 3 0 3 3 0 8 0 vmmpepl 168 44637 0 42757 105 0 105 105 0 357 10 vmsppl 488 600 0 571 7 1 6 6 0 8 0 rwobjpl 80 16561 0 13671 60 0 60 60 0 8 0 pdppl 4096 1210 0 1142 114 34 80 96 0 8 12 pvpl 32 15704 0 0 127 0 127 127 0 265 0 pmappl 256 600 0 571 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 294 0 37 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff8000fffde560,ffff80002a354a40,ffff80002a354990) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80002a354a40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a354a40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1a08d391100, 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_cmp8(1000,fffffd806c96de30) at __sanitizer_cov_trace_cmp8+0x1d kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_cmp8(1000,fffffd806c96de30) at __sanitizer_cov_trace_cmp8+0x1d sys/dev/kcov.c:212 uvm_map_lookup_entry(fffffd806b910ba0,7e000,ffff80003c4244d8) at uvm_map_lookup_entry+0x120 uvm_map_entrybyaddr sys/uvm/uvm_map.c:528 [inline] uvm_map_lookup_entry(fffffd806b910ba0,7e000,ffff80003c4244d8) at uvm_map_lookup_entry+0x120 sys/uvm/uvm_map.c:1565 uvmfault_lookup(ffff80003c4244b0,0) at uvmfault_lookup+0x133 sys/uvm/uvm_fault.c:1924 uvm_fault_check(ffff80003c4244b0,ffff80003c4244e8,ffff80003c424520,0) at uvm_fault_check+0x4a sys/uvm/uvm_fault.c:741 uvm_fault(fffffd806b910ba0,7e000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:677 kpageflttrap(ffff80003c424660,7e740) at kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283 kerntrap(ffff80003c424660) at kerntrap+0x198 sys/arch/amd64/amd64/trap.c:489 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x64 syscall(ffff80003c424aa0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c424aa0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1a03649feb0, count: -14