kernel: protection fault trap, code=0 Stopped at sys_semop+0x3ae: movzwl 0x8(%rax,%rcx,4),%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(ffff8000fffe2d00,ffff80003c4ebf90,ffff80003c4ebee0) at sys_semop+0x3ae sys/kern/sysv_sem.c:620 syscall(ffff80003c4ebf90) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4ebf90) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc744372a60, count: -3 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c4ebeb0 rbx 0 rdx 0 rcx 0x9 rax 0xdeafbeaddeafbead r8 0x7f7fffffc000 r9 0 r10 0x905c22799f79f14d r11 0xa7ea1eccc4f3970b r12 0xffff800000b4e904 r13 0x1 r14 0xffff80003c4ebf90 r15 0x1 rip 0xffffffff824b5e1e sys_semop+0x3ae cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c4ebd90 ss 0x10 sys_semop+0x3ae: movzwl 0x8(%rax,%rcx,4),%r15d ddb{0}> show proc PROC (syz-executor) tid=326242 pid=35492 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=0xffff8000fffe34b0,0xffff8000fffe2040 process=0xffff8000fffe78c0 user=0xffff80003c4e7000, vmspace=0xfffffd806be9ad38 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 16934 122952 63957 0 7 0 syz-executor 35492 443478 53516 0 2 0 syz-executor *35492 326242 53516 0 7 0x4000000 syz-executor 35492 157834 53516 0 3 0x4000080 fsleep syz-executor 40324 244319 3919 0 2 0xc80 syz-executor 40324 359763 3919 0 3 0x4000080 fsleep syz-executor 40324 249933 3919 0 3 0x4000080 lockf syz-executor 40324 215007 3919 0 2 0x4000000 syz-executor 26438 139975 93916 -1 2 0xc90 syz-executor 26438 129145 93916 -1 3 0x4000090 kqpoll syz-executor 86725 213531 10507 0 3 0x80 nanoslp syz-executor 86725 409496 10507 0 3 0x4000080 msgwait syz-executor 86725 6126 10507 0 3 0x4000080 fsleep syz-executor 43553 454350 76597 0 3 0x80 nanoslp syz-executor 43553 78303 76597 0 3 0x4000080 sbwait syz-executor 43553 149405 76597 0 3 0x4000080 fsleep syz-executor 43553 168709 76597 0 3 0x4000080 fsleep syz-executor 52764 273688 53994 0 3 0x80 nanoslp syz-executor 52764 37774 53994 0 3 0x4000080 sbwait syz-executor 52764 21158 53994 0 3 0x4000080 fsleep syz-executor 52764 38448 53994 0 3 0x4000080 fsleep syz-executor 35335 434031 0 0 3 0x14280 nfsidl nfsio 68139 399595 0 0 3 0x14280 nfsidl nfsio 87380 140930 0 0 3 0x14280 nfsidl nfsio 58910 414837 0 0 3 0x14280 nfsidl nfsio 30154 40798 0 0 3 0x14280 nfsidl nfsio 29512 262477 0 0 3 0x14280 nfsidl nfsio 28065 3838 0 0 3 0x14280 nfsidl nfsio 73210 466267 0 0 3 0x14280 nfsidl nfsio 19105 48330 0 0 3 0x14280 nfsidl nfsio 57208 112903 0 0 3 0x14280 nfsidl nfsio 3621 4373 0 0 3 0x14280 nfsidl nfsio 8777 276792 0 0 3 0x14280 nfsidl nfsio 86792 252488 0 0 3 0x14280 nfsidl nfsio 89183 56020 0 0 3 0x14280 nfsidl nfsio 41998 404975 0 0 3 0x14280 nfsidl nfsio 51739 136905 0 0 3 0x14280 nfsidl nfsio 83158 224302 0 0 3 0x14280 nfsidl nfsio 38403 317994 0 0 3 0x14280 nfsidl nfsio 38672 345795 0 0 3 0x14280 nfsidl nfsio 34720 376474 0 0 3 0x14280 nfsidl nfsio 87525 518308 0 0 3 0x14200 bored sosplice 53516 487017 48742 0 3 0x82 nanoslp syz-executor 76597 16391 48742 0 3 0x82 nanoslp syz-executor 10507 102269 48742 0 3 0x82 nanoslp syz-executor 3919 250740 48742 0 2 0xc82 syz-executor 18943 419111 48742 0 2 0x2 syz-executor 53994 109100 48742 0 2 0xc82 syz-executor 93916 379 48742 0 2 0xc82 syz-executor 63957 44080 48742 0 2 0x3 syz-executor 48742 254759 39748 0 3 0x82 kqread syz-executor 39748 66444 91113 0 3 0x10008a sigsusp ksh 91113 190547 49555 0 3 0x98 kqread sshd-session 49555 113239 72835 0 3 0x92 kqread sshd-session 11000 245351 1 0 3 0x100083 ttyin getty 72835 38626 1 0 3 0x88 kqread sshd 3072 372788 52933 74 3 0x1100092 bpf pflogd 52933 471453 1 0 3 0x80 sbwait pflogd 33805 174331 24047 73 3 0x1100090 kqread syslogd 24047 246730 1 0 3 0x100082 sbwait syslogd 15284 51033 1 0 3 0x100080 kqread resolvd 71206 74496 50841 77 3 0x100092 kqread dhcpleased 55999 363944 50841 77 3 0x100092 kqread dhcpleased 50841 163429 1 0 3 0x80 kqread dhcpleased 94012 309346 0 0 3 0x14200 bored smr 58816 27368 0 0 2 0x14200 zerothread 60621 253115 0 0 3 0x14200 aiodoned aiodoned 5056 88051 0 0 3 0x14200 syncer update 19935 153809 0 0 3 0x14200 cleaner cleaner 32490 360173 0 0 3 0x14200 reaper reaper 48997 413067 0 0 3 0x14200 pgdaemon pagedaemon 80637 289421 0 0 3 0x14200 bored viomb 28141 473178 0 0 3 0x40014200 acpi0 acpi0 89355 75307 0 0 3 0x40014200 idle1 78406 293110 0 0 3 0x14200 bored softnet3 83824 279266 0 0 3 0x14200 bored softnet2 52405 266961 0 0 3 0x14200 bored softnet1 50689 219378 0 0 3 0x14200 bored softnet0 40177 179649 0 0 3 0x14200 bored systqmp 97383 221841 0 0 3 0x14200 bored systq 37009 475984 0 0 3 0x14200 tmoslp softclockmp 99065 77854 0 0 2 0x40014200 softclock 44562 352323 0 0 3 0x40014200 idle0 1 130238 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 35492 (syz-executor) thread 0xffff8000fffe2d00 (326242) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83961eb8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 mi_switch+0x4b7 sys/kern/sched_bsd.c:441 #3 yield+0x6a sys/kern/sched_bsd.c:320 #4 malloc+0xe5 sys/kern/kern_malloc.c:174 #5 sys_semop+0x234 sys/kern/sysv_sem.c:564 #6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #7 Xsyscall+0x128 Process 18943 (syz-executor) thread 0xffff8000ffff19c0 (419111) exclusive rrwlock inode r = 0 (0xfffffd806de65760) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 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:1230 #6 ffs_inode_alloc+0x283 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0x113 sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x102 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3109 #10 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c25dc18) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3094 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10195 11160K 11454K 166960K 11803 0 pcb 22 12K 12K 166960K 80 0 rtable 186 8K 9K 166960K 414 0 pf 32 17K 18K 166960K 69 0 ifaddr 35 6K 7K 166960K 61 0 ifgroup 47 2K 2K 166960K 81 0 sysctl 3 1K 9K 166960K 8 0 counters 62 36K 37K 166960K 100 0 ioctlops 0 0K 4K 166960K 1557 0 iov 1 2K 20K 166960K 121 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1365 86K 86K 166960K 1772 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 140 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 485 0 sigio 0 0K 0K 166960K 8 0 proc 72 91K 152K 166960K 571 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 96 0 in_multi 76 5K 7K 166960K 107 0 ether_multi 1 0K 0K 166960K 3 0 mrt 0 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 405 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 231 171K 190K 166960K 6303 0 UVM aobj 16 2K 2K 166960K 17 0 pinsyscall 42 84K 104K 166960K 1608 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 16 0 NDP 10 0K 2K 166960K 38 0 temp 47 8664K 8732K 166960K 18577 0 kqueue 14 22K 28K 166960K 93 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 56 0 53 1 0 1 1 0 8 0 rtentry 176 125 0 45 6 0 6 6 0 8 0 unpcb 144 387 0 367 7 5 2 6 0 8 1 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 808 148 0 143 8 1 7 7 0 8 6 arp 128 19 0 5 1 0 1 1 0 8 0 inpcb 384 494 0 480 11 3 8 8 0 8 6 nd6 144 27 0 7 1 0 1 1 0 8 0 pkpcb 40 5 0 5 2 1 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 15 0 15 1 0 1 1 0 8 1 pppxif 1504 2 0 2 2 1 1 1 0 8 1 pfstscr 40 3 0 3 2 1 1 1 0 8 1 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 1 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 41 0 2 1 0 1 1 0 8 0 pfstkey 128 45 0 6 2 0 2 2 0 8 0 pfstate 384 44 0 5 4 0 4 4 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 525 0 167 29 4 25 29 0 8 0 art_table 32 528 0 167 4 0 4 4 0 8 0 art_node 16 122 0 51 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 2 1 0 1 1 0 8 0 semapl 112 136 0 127 1 0 1 1 0 8 0 shmpl 112 14 0 1 1 0 1 1 0 8 0 dirhash 1024 22 0 5 3 0 3 3 0 8 0 dino2pl 256 2338 0 840 96 0 96 96 0 8 1 ffsino 288 2338 0 840 109 1 108 109 0 8 0 nchpl 144 3042 0 1358 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 1 0 1 0 8 0 uvmvnodes 80 2592 0 0 53 0 53 53 0 8 0 vnodes 216 2592 0 0 144 0 144 144 0 8 0 namei 1024 10348 0 10347 3 2 1 1 0 8 0 percpumem 16 65 0 19 1 0 1 1 0 8 0 kstatmem 264 46 0 24 2 0 2 2 0 8 0 scsiplug 72 2 0 2 2 1 1 1 0 8 1 scxspl 216 9485 0 9485 10 9 1 8 1 8 1 plimitpl 152 58 0 41 1 0 1 1 0 8 0 sigapl 424 817 0 747 9 1 8 8 0 8 0 knotepl 120 782 0 0 24 0 24 24 0 8 0 kqueuepl 224 274 0 263 5 4 1 5 0 8 0 pipepl 336 136 0 109 3 0 3 3 0 8 0 fdescpl 520 778 0 747 3 0 3 3 0 8 0 filepl 160 4727 0 4503 20 7 13 17 0 8 3 lockfpl 104 84 0 79 1 0 1 1 0 8 0 lockfspl 48 39 0 35 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 39 0 22 1 0 1 1 0 8 0 ucredpl 104 792 0 778 1 0 1 1 0 8 0 zombiepl 144 844 0 844 1 0 1 1 0 8 1 processpl 1208 817 0 747 6 0 6 6 0 8 0 procpl 656 1437 0 1353 10 2 8 8 0 8 0 srpgc 96 5 0 5 2 1 1 1 0 8 1 sosppl 168 2 0 2 2 1 1 1 0 8 1 sockpl 728 949 0 912 22 12 10 16 0 8 6 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 124 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 45 0 0 2 0 2 2 0 8 0 mbufpl 256 1191 0 0 75 0 75 75 0 8 0 bufpl 280 3107 0 123 214 0 214 214 0 8 0 anonpl 32 7711 0 0 63 0 63 63 0 246 0 amapchunkpl 152 19989 0 19532 34 5 29 29 0 158 8 amappl16 200 2903 0 2868 29 14 15 15 0 8 10 amappl15 192 6 0 5 1 0 1 1 0 8 0 amappl14 184 114 0 102 1 0 1 1 0 8 0 amappl13 176 5 0 5 1 1 0 1 0 8 0 amappl12 168 1435 0 1404 4 1 3 3 0 8 0 amappl11 160 51 0 37 1 0 1 1 0 8 0 amappl10 152 6 0 6 1 1 0 1 0 8 0 amappl9 144 250 0 250 1 1 0 1 0 8 0 amappl8 136 28 0 25 1 0 1 1 0 8 0 amappl7 128 113 0 101 1 0 1 1 0 8 0 amappl6 120 193 0 189 1 0 1 1 0 8 0 amappl5 112 124 0 115 1 0 1 1 0 8 0 amappl4 104 331 0 311 1 0 1 1 0 8 0 amappl3 96 3686 0 3584 5 1 4 4 0 8 0 amappl2 88 656 0 592 2 0 2 2 0 8 0 amappl1 80 9956 0 9349 15 0 15 15 0 8 0 amappl 88 5537 0 5380 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 7 0 7 2 2 0 1 0 8 0 dma128 128 254 0 254 2 1 1 1 0 8 1 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 16 0 1 1 0 1 1 0 8 0 uaddrrnd 24 778 0 747 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 778 0 747 1 0 1 1 0 8 0 vmmpekpl 168 8017 0 7978 3 0 3 3 0 8 0 vmmpepl 168 55630 0 53640 110 11 99 101 0 357 2 vmsppl 480 777 0 747 5 0 5 5 0 8 1 rwobjpl 72 20013 0 16476 70 1 69 69 0 8 0 pdppl 4096 1563 0 1494 99 28 71 83 0 8 2 pvpl 32 15627 0 0 127 0 127 127 0 265 0 pmappl 256 777 0 747 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 457 0 40 13 0 13 13 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff8000fffe2d00,ffff80003c4ebf90,ffff80003c4ebee0) at sys_semop+0x3ae sys/kern/sysv_sem.c:620 syscall(ffff80003c4ebf90) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4ebf90) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc744372a60, count: -3 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299ddff0) 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+0x1a kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x1a sys/dev/kcov.c:153 __mp_lock(ffffffff83961cb0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83961cb0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 syscall(ffff8000387ea2b0) at syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000387ea2b0) at syscall+0xae6 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73d5759fd570, count: -7