login: kernel: protection fault trap, code=0 Stopped at sys_semop+0x45b: movzwl 0(%rax),%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(ffff8000ffff42b8,ffff80003c650160,ffff80003c6500b0) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80003c650160) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c650160) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2dfe6e18bc0, count: -3 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c650080 rbx 0 rdx 0 rcx 0xffff8000ffff42b8 rax 0xdeadbeefdeadbeef r8 0x7f7fffffc000 r9 0x1 r10 0x2dbbe436567dbc74 r11 0xd6dd5312c43ed970 r12 0xffff800001320a04 r13 0 r14 0xffff80003c650160 r15 0 rip 0xffffffff81d6af7b sys_semop+0x45b cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c64ff60 ss 0x10 sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{1}> show proc PROC (syz-executor) tid=268251 pid=21619 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=0xffff8000ffff47c8,0xffff8000ffff2558 process=0xffff80003c657db0 user=0xffff80003c64b000, vmspace=0xfffffd806b8c6ad0 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 21619 241673 8893 0 3 0 futex syz-executor *21619 268251 8893 0 7 0x4000000 syz-executor 21619 205494 8893 0 2 0x4000000 syz-executor 61055 337505 97049 0 2 0 syz-executor 89131 420432 20114 0 2 0 syz-executor 89131 128749 20114 0 3 0x4000080 fsleep syz-executor 89131 298281 20114 0 2 0x4000000 syz-executor 3236 375069 63559 0 2 0 syz-executor 3236 333204 63559 0 3 0x4000080 fsleep syz-executor 3236 122445 63559 0 7 0x4000000 syz-executor 56345 388121 46651 0 2 0 syz-executor 56345 460715 46651 0 3 0x4000080 fsleep syz-executor 43030 84873 75859 0 2 0 syz-executor 43030 24355 75859 0 3 0x4000080 fsleep syz-executor 10455 229111 1 0 3 0x100083 ttyin getty 44544 277777 0 0 3 0x14200 acct acct 25919 338685 0 0 3 0x14200 bored sosplice 44810 265141 0 0 3 0x14280 nfsidl nfsio 58898 123642 0 0 3 0x14280 nfsidl nfsio 39877 449992 0 0 3 0x14280 nfsidl nfsio 12091 25583 0 0 3 0x14280 nfsidl nfsio 54459 165190 0 0 3 0x14280 nfsidl nfsio 16624 133216 0 0 3 0x14280 nfsidl nfsio 8936 401634 0 0 3 0x14280 nfsidl nfsio 2908 324021 0 0 3 0x14280 nfsidl nfsio 97021 139928 0 0 3 0x14280 nfsidl nfsio 11713 224721 0 0 3 0x14280 nfsidl nfsio 35743 254217 0 0 3 0x14280 nfsidl nfsio 71809 96364 0 0 3 0x14280 nfsidl nfsio 40913 442203 0 0 3 0x14280 nfsidl nfsio 72331 439962 0 0 3 0x14280 nfsidl nfsio 84898 64349 0 0 3 0x14280 nfsidl nfsio 11744 435522 0 0 3 0x14280 nfsidl nfsio 17245 69964 0 0 3 0x14280 nfsidl nfsio 7260 1618 0 0 3 0x14280 nfsidl nfsio 39023 217802 0 0 3 0x14280 nfsidl nfsio 23457 11914 0 0 3 0x14280 nfsidl nfsio 46651 126699 37399 0 3 0x82 nanoslp syz-executor 77992 182050 37399 0 3 0x82 nanoslp syz-executor 20114 431121 37399 0 3 0x82 nanoslp syz-executor 97049 150259 37399 0 3 0x82 nanoslp syz-executor 8893 354825 37399 0 3 0x82 nanoslp syz-executor 27242 64636 37399 0 3 0x82 nanoslp syz-executor 63559 313077 37399 0 3 0x82 nanoslp syz-executor 75859 115987 37399 0 3 0x82 nanoslp syz-executor 37399 224632 91479 0 3 0x82 kqread syz-executor 91479 454307 84504 0 3 0x10008a sigsusp ksh 84504 141177 33245 0 3 0x98 kqread sshd-session 33245 173053 28548 0 3 0x92 kqread sshd-session 28548 442528 1 0 3 0x88 kqread sshd 95668 193415 51203 74 3 0x1100092 bpf pflogd 51203 443091 1 0 3 0x80 sbwait pflogd 28744 249496 99182 73 3 0x1100090 kqread syslogd 99182 219764 1 0 3 0x100082 sbwait syslogd 64748 182459 1 0 3 0x100080 kqread resolvd 53607 414136 47529 77 3 0x100092 kqread dhcpleased 7669 408089 47529 77 3 0x100092 kqread dhcpleased 47529 433663 1 0 3 0x80 kqread dhcpleased 97476 258069 0 0 3 0x14200 bored smr 57810 469303 0 0 2 0x14200 zerothread 88950 8959 0 0 3 0x14200 aiodoned aiodoned 94753 182215 0 0 3 0x14200 syncer update 59595 482216 0 0 3 0x14200 cleaner cleaner 54302 190114 0 0 3 0x14200 reaper reaper 25530 495822 0 0 3 0x14200 pgdaemon pagedaemon 76037 73678 0 0 3 0x14200 bored viomb 72759 469508 0 0 3 0x40014200 acpi0 acpi0 52946 242915 0 0 3 0x40014200 idle1 68423 257129 0 0 3 0x14200 bored softnet3 57991 206482 0 0 3 0x14200 bored softnet2 61180 416510 0 0 3 0x14200 bored softnet1 82216 326824 0 0 3 0x14200 bored softnet0 11792 11279 0 0 3 0x14200 bored systqmp 96605 121276 0 0 3 0x14200 bored systq 8977 451683 0 0 3 0x14200 tmoslp softclockmp 39261 465830 0 0 3 0x40014200 tmoslp softclock 78243 229912 0 0 3 0x40014200 idle0 1 32304 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 21619 (syz-executor) thread 0xffff8000ffff42b8 (268251) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8365d108) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 __mp_acquire_count+0x58 #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:577 #7 Xsyscall+0x128 Process 21619 (syz-executor) thread 0xffff8000ffff2548 (205494) exclusive rwlock futex r = 0 (0xffffffff834aed88) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 sys_futex+0x69 sys/kern/sys_futex.c:98 #3 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #4 Xsyscall+0x128 Process 89131 (syz-executor) thread 0xffff8000ffff4030 (298281) exclusive rwlock vmmaplk r = 0 (0xfffffd806b8c6a08) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5250 #3 uvmfault_lookup+0xe8 sys/uvm/uvm_fault.c:1858 #4 uvm_fault_check+0x987 uvmfault_amapcopy sys/uvm/uvm_fault.c:235 [inline] #4 uvm_fault_check+0x987 sys/uvm/uvm_fault.c:774 #5 uvm_fault+0x106 sys/uvm/uvm_fault.c:668 #6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #7 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #8 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10201 11027K 11348K 166960K 11725 0 pcb 17 12K 12K 166960K 93 0 rtable 182 6K 7K 166960K 403 0 pf 34 17K 18K 166960K 62 0 ifaddr 38 6K 7K 166960K 61 0 ifgroup 55 2K 2K 166960K 77 0 sysctl 2 1K 2K 166960K 3 0 counters 64 36K 36K 166960K 78 0 ioctlops 0 0K 4K 166960K 1510 0 iov 0 0K 12K 166960K 17 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1330 84K 84K 166960K 1657 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 2K 6K 166960K 11 0 VM map 2 1K 1K 166960K 2 0 sem 10 0K 0K 166960K 16 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 89K 166960K 554 0 sigio 0 0K 0K 166960K 10 0 proc 72 91K 128K 166960K 599 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 65 0 in_multi 80 5K 7K 166960K 142 0 ether_multi 1 0K 0K 166960K 2 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 91 413K 413K 166960K 91 0 exec 0 0K 1K 166960K 635 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 240 73K 77K 166960K 6763 0 UVM aobj 19 2K 2K 166960K 22 0 pinsyscall 43 86K 104K 166960K 1643 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 20 0 NDP 12 0K 2K 166960K 39 0 temp 45 6888K 6962K 166960K 22408 0 kqueue 13 20K 28K 166960K 87 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 128 0 124 3 0 3 3 0 8 2 rtentry 112 122 0 41 4 0 4 4 0 8 0 unpcb 144 310 0 293 4 2 2 3 0 8 1 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 808 315 0 310 13 6 7 7 0 8 6 arp 120 19 0 4 1 0 1 1 0 8 0 inpcb 376 650 0 639 9 1 8 8 0 8 6 nd6 136 27 0 8 1 0 1 1 0 8 0 pkpcb 40 3 0 3 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 4 0 4 2 1 1 1 0 8 1 pffrag 232 3 0 2 2 1 1 1 0 482 0 pffrnode 88 3 0 2 2 1 1 1 0 8 0 pffrent 40 48 0 47 2 1 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 49 0 2 1 0 1 1 0 8 0 pfstkey 128 49 0 2 2 0 2 2 0 8 0 pfstate 376 49 0 2 5 0 5 5 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 567 0 210 30 1 29 30 0 8 4 art_table 32 568 0 210 4 0 4 4 0 8 0 art_node 16 121 0 49 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 4 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 12 0 5 1 0 1 1 0 8 0 shmpl 112 19 0 3 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2343 0 838 95 0 95 95 0 8 0 ffsino 280 2343 0 838 109 0 109 109 0 8 0 nchpl 144 3140 0 1453 63 0 63 63 0 8 0 uvmvnodes 80 2571 0 0 53 0 53 53 0 8 0 vnodes 216 2571 0 0 143 0 143 143 0 8 0 namei 1024 10361 0 10360 4 3 1 2 0 8 0 percpumem 16 53 0 7 1 0 1 1 0 8 0 kstatmem 264 38 0 14 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 8828 0 8828 3 2 1 2 1 8 1 plimitpl 152 84 0 65 1 0 1 1 0 8 0 sigapl 424 877 0 805 9 0 9 9 0 8 0 futexpl 64 6400 0 6395 1 0 1 1 0 8 0 knotepl 120 311 0 0 10 0 10 10 0 8 0 kqueuepl 216 138 0 129 1 0 1 1 0 8 0 pipepl 328 145 0 118 3 0 3 3 0 8 0 fdescpl 504 837 0 805 5 0 5 5 0 8 0 filepl 152 4439 0 4220 17 3 14 14 0 8 4 lockfpl 104 314 0 310 3 2 1 3 0 8 0 lockfspl 48 57 0 53 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 104 678 0 665 1 0 1 1 0 8 0 zombiepl 144 976 0 973 2 1 1 1 0 8 0 processpl 1168 877 0 805 6 0 6 6 0 8 0 procpl 648 1592 0 1511 8 0 8 8 0 8 0 srpgc 96 4 0 4 2 1 1 1 0 8 1 sosppl 168 8 0 8 1 0 1 1 0 8 1 sockpl 688 1099 0 1068 18 7 11 15 0 8 8 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 116 0 0 15 0 15 15 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 337 0 0 22 0 22 22 0 8 0 bufpl 280 3107 0 127 213 0 213 213 0 8 0 anonpl 24 138285 0 133749 48 18 30 46 0 185 0 amapchunkpl 152 21426 0 20843 34 3 31 31 0 158 8 amappl16 200 2662 0 2618 14 10 4 14 0 8 0 amappl15 192 45 0 45 1 1 0 1 0 8 0 amappl14 184 116 0 104 1 0 1 1 0 8 0 amappl13 176 3 0 3 1 1 0 1 0 8 0 amappl12 168 1488 0 1456 3 1 2 2 0 8 0 amappl11 160 54 0 39 1 0 1 1 0 8 0 amappl10 152 2 0 2 1 1 0 1 0 8 0 amappl9 144 247 0 247 1 1 0 1 0 8 0 amappl8 136 23 0 20 1 0 1 1 0 8 0 amappl7 128 146 0 134 1 0 1 1 0 8 0 amappl6 120 182 0 179 1 0 1 1 0 8 0 amappl5 112 138 0 129 1 0 1 1 0 8 0 amappl4 104 315 0 297 1 0 1 1 0 8 0 amappl3 96 4129 0 4006 4 0 4 4 0 8 0 amappl2 88 642 0 579 2 0 2 2 0 8 0 amappl1 80 9003 0 8425 14 1 13 14 0 8 0 amappl 88 6363 0 6178 6 1 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 21 0 3 1 0 1 1 0 8 0 uaddrrnd 24 837 0 805 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 837 0 805 1 0 1 1 0 8 0 vmmpekpl 168 8467 0 8431 3 0 3 3 0 8 0 vmmpepl 168 56440 0 54502 97 11 86 94 0 357 1 vmsppl 456 836 0 805 5 1 4 5 0 8 0 rwobjpl 64 20222 0 16668 58 0 58 58 0 8 0 pdppl 4096 1681 0 1610 105 34 71 85 0 8 0 pvpl 32 15875 0 0 129 0 129 129 0 265 0 pmappl 248 836 0 805 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 311 0 48 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(ffffffff83549ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff8365cf00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8365cf00) at __mp_lock+0x192 sys/kern/kern_lock.c:144 __mp_acquire_count(ffffffff8365cf00,1) at __mp_acquire_count+0x58 mi_switch() at mi_switch+0x4b7 sys/kern/sched_bsd.c:441 yield() at yield+0x6a sys/kern/sched_bsd.c:320 pool_get(ffffffff836a9208,1) at pool_get+0x265 sys/kern/subr_pool.c:593 namei(ffff800034166910) at namei+0xdf sys/kern/vfs_lookup.c:145 vn_open(ffff800034166910,102,0) at vn_open+0x13f sys/kern/vfs_vnops.c:140 sys_ktrace(ffff8000ffff3988,ffff800034166af0,ffff800034166a40) at sys_ktrace+0x9a sys/kern/kern_ktrace.c:551 syscall(ffff800034166af0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800034166af0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x58c922663c0, count: -13 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{1}> trace sys_semop(ffff8000ffff42b8,ffff80003c650160,ffff80003c6500b0) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80003c650160) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c650160) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2dfe6e18bc0, count: -3