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(ffff800037c094e0,ffff80002a28cd90,ffff80002a28cce0) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80002a28cd90) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a28cd90) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9319583e640, count: -3 ddb{1}> show registers rdi 0 rsi 0xb rbp 0xffff80002a28ccb0 rbx 0xdead4110dead4110 rdx 0 rcx 0xffff800037c094e0 rax 0xffff8000299edff0 r8 0x7f7fffffc000 r9 0x1 r10 0x1c623f342b426daa r11 0xd665799b7318b77c r12 0xb r13 0xfffffd806b9327e0 r14 0xffff80002a28cd90 r15 0xb rip 0xffffffff828b99c2 sys_semop+0x352 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a28cbc0 ss 0x10 sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> show proc PROC (syz-executor) tid=391799 pid=13003 tcnt=4 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=0xffff800037c09248,0xffff800037c09788 process=0xffff80002a3ce1c8 user=0xffff80002a287000, vmspace=0xfffffd807931b010 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 13003 116711 75032 0 7 0 syz-executor *13003 391799 75032 0 7 0x4000000 syz-executor 13003 152725 75032 0 3 0x4000080 fsleep syz-executor 13003 372035 75032 0 2 0x4000000 syz-executor 1705 266385 84981 0 2 0 syz-executor 1705 85791 84981 0 2 0x4000000 syz-executor 84914 471057 15811 60929 4 0x82014 syz-executor 84914 417412 15811 60929 4 0x4082014 syz-executor 84914 403711 15811 60929 2 0x4002014 syz-executor 1408 128963 45227 0 2 0 syz-executor 1408 155777 45227 0 3 0x4000000 biowait syz-executor 90415 414325 0 0 3 0x14200 acct acct 26409 434808 76585 0 3 0x3000 suspend syz-executor 26409 267203 76585 0 3 0x4081000 inode syz-executor 26409 218270 76585 0 2 0x4081000 syz-executor 26409 176301 76585 0 3 0x4081000 inode syz-executor 83171 283557 1 0 3 0x100083 ttyopn getty 66860 248319 0 0 3 0x14200 bored sosplice 76585 458750 8084 0 3 0x82 wait syz-executor 51787 361744 8084 0 3 0x82 nanoslp syz-executor 45227 319177 8084 0 3 0x82 nanoslp syz-executor 88634 478994 8084 0 2 0x3 syz-executor 15811 225245 8084 0 3 0x82 nanoslp syz-executor 75032 471258 8084 0 3 0x82 nanoslp syz-executor 21469 111180 8084 0 3 0x82 nanoslp syz-executor 84981 248551 8084 0 3 0x82 nanoslp syz-executor 8084 68556 70638 0 3 0x82 kqread syz-executor 70638 109220 9671 0 3 0x10008a sigsusp ksh 9671 436448 39622 0 3 0x98 kqread sshd-session 39622 508402 66152 0 3 0x92 kqread sshd-session 66152 216564 1 0 3 0x88 kqread sshd 86690 466841 68718 74 3 0x1100092 bpf pflogd 68718 502366 1 0 3 0x80 sbwait pflogd 26577 68017 13591 73 3 0x1100090 kqread syslogd 13591 454418 1 0 3 0x100082 sbwait syslogd 67941 97756 1 0 3 0x100080 kqread resolvd 95813 46345 16515 77 3 0x100092 kqread dhcpleased 24782 377453 16515 77 3 0x100092 kqread dhcpleased 16515 51584 1 0 3 0x80 kqread dhcpleased 28642 152785 0 0 3 0x14200 bored smr 36604 91199 0 0 3 0x14200 pgzero zerothread 75718 363805 0 0 3 0x14200 aiodoned aiodoned 63167 116824 0 0 3 0x14200 syncer update 81135 151133 0 0 3 0x14200 cleaner cleaner 79126 184095 0 0 3 0x14200 reaper reaper 19879 511707 0 0 3 0x14200 pgdaemon pagedaemon 51806 168868 0 0 3 0x14200 bored viomb 78844 112421 0 0 3 0x40014200 acpi0 acpi0 88628 225772 0 0 3 0x40014200 idle1 75432 339529 0 0 3 0x14200 bored softnet1 82295 262871 0 0 3 0x14200 bored softnet0 88396 8015 0 0 3 0x14200 bored systqmp 18785 348256 0 0 3 0x14200 bored systq 25019 155707 0 0 3 0x14200 tmoslp softclockmp 57045 108620 0 0 3 0x40014200 tmoslp softclock 70576 79466 0 0 3 0x40014200 idle0 1 297170 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 13003 (syz-executor) thread 0xffff800037c094e0 (391799) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83988dd8) #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:748 #5 Xsyscall+0x128 Process 1705 (syz-executor) thread 0xffff80003c426558 (85791) exclusive rwlock vmmaplk r = 0 (0xfffffd8072023c88) #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+0x3c6 sys/arch/amd64/amd64/trap.c:605 #7 recall_trap+0x8 Process 1408 (syz-executor) thread 0xffff80003c427a18 (155777) exclusive rrwlock inode r = 0 (0xfffffd806e2844a0) #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_makeinode+0xcd sys/ufs/ufs/ufs_vnops.c:1732 #8 ufs_mknod+0x5b sys/ufs/ufs/ufs_vnops.c:167 #9 VOP_MKNOD+0x101 sys/kern/vfs_vops.c:121 #10 domknodat+0x469 sys/kern/vfs_syscalls.c:1640 #11 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #12 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806e277e90) #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 domknodat+0xb4 sys/kern/vfs_syscalls.c:1592 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #9 Xsyscall+0x128 Process 26409 (syz-executor) thread 0xffff80003c426fb8 (267203) exclusive rrwlock inode r = 0 (0xfffffd8062054c70) #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 domknodat+0xb4 sys/kern/vfs_syscalls.c:1592 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #9 Xsyscall+0x128 Process 26409 (syz-executor) thread 0xffff800037c08020 (218270) exclusive rrwlock inode r = 0 (0xfffffd8079549eb8) #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 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10228 11114K 11374K 166960K 12386 0 pcb 18 12K 12K 166960K 83 0 rtable 186 7K 7K 166960K 346 0 pf 35 17K 21K 166960K 95 0 ifaddr 36 6K 7K 166960K 65 0 ifgroup 55 2K 3K 166960K 105 0 sysctl 4 1K 9K 166960K 10 0 counters 66 36K 37K 166960K 110 0 ioctlops 0 0K 4K 166960K 1614 0 iov 0 0K 16K 166960K 24 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1467 92K 92K 166960K 1935 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 13 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 22 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 97K 166960K 610 0 sigio 0 0K 0K 166960K 12 0 proc 75 131K 196K 166960K 611 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 316 0 in_multi 76 5K 7K 166960K 126 0 ether_multi 1 0K 0K 166960K 11 0 mrt 1 0K 0K 166960K 5 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 211 943K 943K 166960K 211 0 exec 0 0K 1K 166960K 411 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 255 176K 191K 166960K 7350 0 UVM aobj 18 4K 4K 166960K 20 0 pinsyscall 42 84K 103K 166960K 1692 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 78 0 NDP 11 0K 2K 166960K 41 0 temp 51 8649K 8722K 166960K 43797 0 kqueue 17 24K 32K 166960K 125 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 70 0 67 1 0 1 1 0 8 0 rtentry 176 118 0 39 5 0 5 5 0 8 0 unpcb 144 265 0 245 2 1 1 2 0 8 0 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 736 357 0 352 7 6 1 7 0 8 0 arp 136 16 0 5 1 0 1 1 0 8 0 inpcb 328 708 0 695 7 5 2 7 0 8 0 nd6 152 18 0 4 1 0 1 1 0 8 0 pkpcb 40 10 0 10 2 1 1 1 0 8 1 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 16 0 15 2 1 1 1 0 8 0 pppxif 1504 3 0 3 1 1 0 1 0 8 0 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pffrag 232 5 0 0 1 0 1 1 0 482 0 pffrnode 88 5 0 0 1 0 1 1 0 8 0 pffrent 40 6 0 1 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 3 0 3 1 1 0 1 0 8 0 pfstitem 24 18 0 10 1 0 1 1 0 8 0 pfstkey 128 22 0 14 1 0 1 1 0 8 0 pfstate 384 20 0 12 2 0 2 2 0 8 0 pfrule 1344 24 0 18 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 510 0 157 28 3 25 28 0 8 0 art_table 40 512 0 157 5 0 5 5 0 8 0 art_node 32 115 0 48 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 8 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 17 0 8 1 0 1 1 0 8 0 shmpl 112 17 0 2 1 0 1 1 0 8 0 dirhash 1024 25 0 8 3 0 3 3 0 8 0 dino2pl 256 2479 0 970 95 0 95 95 0 8 0 ffsino 296 2479 0 970 117 0 117 117 0 8 0 nchpl 144 3389 0 1690 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 1 0 1 0 8 0 uvmvnodes 80 2951 0 0 61 0 61 61 0 8 0 vnodes 216 2951 0 0 164 0 164 164 0 8 0 namei 1024 11483 0 11481 2 1 1 2 0 8 0 percpumem 16 70 0 22 1 0 1 1 0 8 0 kstatmem 264 52 0 28 2 0 2 2 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 17064 0 17063 10 9 1 8 1 8 0 plimitpl 152 134 0 114 1 0 1 1 0 8 0 sigapl 424 911 0 862 7 1 6 7 0 8 0 knotepl 120 517 0 0 16 0 16 16 0 8 0 kqueuepl 224 327 0 314 5 3 2 5 0 8 0 pipepl 344 146 0 119 3 0 3 3 0 8 0 fdescpl 528 891 0 860 3 0 3 3 0 8 0 filepl 160 5402 0 5174 19 7 12 18 0 8 1 lockfpl 104 349 0 346 2 0 2 2 0 8 1 lockfspl 48 151 0 148 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 35 0 18 1 0 1 1 0 8 0 ucredpl 104 726 0 712 1 0 1 1 0 8 0 zombiepl 144 899 0 896 1 0 1 1 0 8 0 processpl 1232 911 0 862 5 1 4 5 0 8 0 procpl 664 1776 0 1717 6 0 6 6 0 8 0 sosppl 168 3 0 3 2 2 0 1 0 8 0 sockpl 752 1066 0 1030 11 6 5 10 0 8 1 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 15 0 15 15 0 8 0 mcl2k 2048 32 0 0 4 0 4 4 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 1771 0 0 111 0 111 111 0 8 0 bufpl 280 7039 0 895 440 0 440 440 0 8 0 anonpl 32 13525 0 0 110 0 110 110 0 246 0 amapchunkpl 152 24939 0 24322 45 18 27 41 0 158 0 amappl16 200 3701 0 3339 28 8 20 20 0 8 0 amappl15 192 10 0 10 2 2 0 1 0 8 0 amappl14 184 113 0 101 1 0 1 1 0 8 0 amappl13 176 11 0 11 2 2 0 1 0 8 0 amappl12 168 1533 0 1502 4 2 2 3 0 8 0 amappl11 160 51 0 37 1 0 1 1 0 8 0 amappl10 152 7 0 7 1 1 0 1 0 8 0 amappl9 144 258 0 258 1 1 0 1 0 8 0 amappl8 136 26 0 23 1 0 1 1 0 8 0 amappl7 128 106 0 93 1 0 1 1 0 8 0 amappl6 120 176 0 173 1 0 1 1 0 8 0 amappl5 112 123 0 114 1 0 1 1 0 8 0 amappl4 104 299 0 280 1 0 1 1 0 8 0 amappl3 96 4057 0 3960 3 0 3 3 0 8 0 amappl2 88 1122 0 1043 2 0 2 2 0 8 0 amappl1 80 10005 0 9405 14 1 13 14 0 8 0 amappl 88 6588 0 6410 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 8 0 8 3 2 1 1 0 8 1 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 19 0 2 1 0 1 1 0 8 0 uaddrrnd 24 891 0 860 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 891 0 860 1 0 1 1 0 8 0 vmmpekpl 168 8591 0 8551 3 0 3 3 0 8 0 vmmpepl 168 62338 0 60001 106 3 103 103 0 357 0 vmsppl 488 890 0 860 5 1 4 5 0 8 0 rwobjpl 80 22172 0 17929 87 0 87 87 0 8 0 pdppl 4096 1790 0 1720 98 26 72 88 0 8 2 pvpl 32 22518 0 0 185 3 182 182 0 265 0 pmappl 256 890 0 860 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 375 0 40 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff837d7ff0) 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+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff83988bd0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83988bd0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 intr_handler(ffff8000333e7360,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x717ce41b2f00, count: -7 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> trace sys_semop(ffff800037c094e0,ffff80002a28cd90,ffff80002a28cce0) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80002a28cd90) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a28cd90) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9319583e640, count: -3