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(ffff80003c4267f0,ffff80002ebdf0a0,ffff80002ebdeff0) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80002ebdf0a0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002ebdf0a0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x13c5e993100, count: -3 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002ebdefc0 rbx 0xdeadbeefdeadc0cf rdx 0 rcx 0xffff80003c4267f0 rax 0xdeadbeefdeadc0cf r8 0x7f7fffffc000 r9 0 r10 0xba2dfd257e0cd671 r11 0xbd56abd969219f8 r12 0 r13 0xfffffd806c264b60 r14 0xffff80002ebdf0a0 r15 0 rip 0xffffffff8268fa15 sys_semop+0x3d5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002ebdeed0 ss 0x10 sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{0}> show proc PROC (syz-executor) tid=414056 pid=33246 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=86, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c427780,0xffff80003c427cc0 process=0xffff80002a3d1828 user=0xffff80002ebda000, vmspace=0xfffffd80672389b0 estcpu=36, cpticks=2, pctcpu=0.0, user=1, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 19469 139339 51915 0 2 0 syz-executor 85437 342557 5376 0 2 0 syz-executor 85437 441148 5376 0 3 0x4000080 fsleep syz-executor 52864 52160 69905 0 2 0 syz-executor 52864 100927 69905 0 7 0x4000000 syz-executor 52864 199044 69905 0 2 0x4000000 syz-executor 33246 156676 17494 0 2 0 syz-executor *33246 414056 17494 0 7 0x4000000 syz-executor 33246 211963 17494 0 3 0x4000080 fsleep syz-executor 33246 44085 17494 0 3 0x4000080 fsleep syz-executor 25068 37158 66788 0 2 0 syz-executor 84809 455031 59696 0 2 0 syz-executor 84809 274555 59696 0 2 0x4000000 syz-executor 86564 230061 41020 0 2 0 syz-executor 86564 435709 41020 0 3 0x4000080 fsleep syz-executor 86564 401558 41020 0 3 0x4000080 fsleep syz-executor 99041 374308 66037 0 3 0x82 nanoslp syz-executor 5376 67087 66037 0 3 0x82 nanoslp syz-executor 41020 106260 66037 0 3 0x82 nanoslp syz-executor 17494 354047 66037 0 3 0x82 nanoslp syz-executor 69905 398926 66037 0 3 0x82 nanoslp syz-executor 51915 288221 66037 0 3 0x82 nanoslp syz-executor 59696 201289 66037 0 3 0x82 nanoslp syz-executor 66788 57576 66037 0 2 0x3 syz-executor 66037 495913 80564 0 3 0x82 kqread syz-executor 80564 382437 3560 0 3 0x10008a sigsusp ksh 3560 486900 50495 0 3 0x98 kqread sshd-session 50495 459078 73269 0 3 0x92 kqread sshd-session 78487 231918 1 0 3 0x100083 ttyopn getty 73269 381283 1 0 3 0x88 kqread sshd 75872 243456 52573 74 3 0x1100092 bpf pflogd 52573 39472 1 0 3 0x80 sbwait pflogd 33515 401951 92319 73 3 0x1100090 kqread syslogd 92319 196075 1 0 3 0x100082 sbwait syslogd 60728 11579 1 0 3 0x100080 kqread resolvd 3159 409121 35564 77 3 0x100092 kqread dhcpleased 50306 177907 35564 77 3 0x100092 kqread dhcpleased 35564 304731 1 0 3 0x80 kqread dhcpleased 9130 221559 0 0 3 0x14200 bored smr 74509 18679 0 0 2 0x14200 zerothread 54000 295805 0 0 3 0x14200 aiodoned aiodoned 78053 335209 0 0 3 0x14200 syncer update 77382 349143 0 0 3 0x14200 cleaner cleaner 79197 189474 0 0 3 0x14200 reaper reaper 10830 266986 0 0 3 0x14200 pgdaemon pagedaemon 90423 141653 0 0 3 0x14200 bored viomb 50100 350530 0 0 3 0x40014200 acpi0 acpi0 10161 521007 0 0 3 0x40014200 idle1 72565 79897 0 0 3 0x14200 bored softnet1 36181 162089 0 0 3 0x14200 bored softnet0 97260 132157 0 0 3 0x14200 bored systqmp 92626 436553 0 0 3 0x14200 bored systq 79118 329522 0 0 3 0x14200 tmoslp softclockmp 57353 14597 0 0 3 0x40014200 tmoslp softclock 76801 165840 0 0 3 0x40014200 idle0 1 186996 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 52864 (syz-executor) thread 0xffff80003a00cd18 (100927) exclusive rrwlock inode r = 0 (0xfffffd806f0e95a8) #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:775 #9 Xsyscall+0x128 Process 33246 (syz-executor) thread 0xffff80003c4267f0 (414056) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838b4448) #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:175 #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:775 #5 Xsyscall+0x128 Process 84809 (syz-executor) thread 0xffff80003c427a18 (274555) exclusive rwlock fdlock r = 0 (0xffff8000363fecd0) #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 doopenat+0x18e sys/kern/vfs_syscalls.c:1105 #3 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #4 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10211 11042K 11492K 166960K 12144 0 pcb 17 15K 16K 166960K 194 0 rtable 250 8K 8K 166960K 430 0 pf 35 17K 21K 166960K 118 0 ifaddr 40 7K 8K 166960K 78 0 ifgroup 58 2K 2K 166960K 129 0 sysctl 4 1K 9K 166960K 10 0 counters 70 37K 38K 166960K 132 0 ioctlops 0 0K 12K 166960K 1675 0 iov 0 0K 12K 166960K 102 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1462 92K 92K 166960K 2051 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 12 1K 1K 166960K 23 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 110K 166960K 796 0 sigio 0 0K 0K 166960K 13 0 proc 72 115K 164K 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 83 0 in_multi 88 6K 7K 166960K 126 0 ether_multi 1 0K 0K 166960K 5 0 mrt 0 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 508 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 249 167K 191K 166960K 9360 0 UVM aobj 19 6K 8K 166960K 21 0 pinsyscall 43 86K 102K 166960K 1928 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 92 0 NDP 12 0K 1K 166960K 53 0 temp 68 8677K 8744K 166960K 52771 0 kqueue 15 24K 28K 166960K 137 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 120 138 0 134 3 2 1 3 0 8 0 rtentry 176 130 0 21 6 0 6 6 0 8 0 unpcb 144 724 0 707 5 1 4 4 0 8 3 syncache 336 6 0 6 2 1 1 1 0 8 1 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 736 298 0 291 7 0 7 7 0 8 5 arp 136 19 0 3 1 0 1 1 0 8 0 inpcb 328 1020 0 1007 13 6 7 12 0 8 5 nd6 152 31 0 3 2 0 2 2 0 8 0 pkpcb 40 4 0 4 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 23 0 23 1 0 1 1 0 8 1 pppxif 1504 5 0 5 2 1 1 1 0 8 1 pffrag 232 11 0 5 1 0 1 1 0 482 0 pffrnode 88 11 0 5 1 0 1 1 0 8 0 pffrent 40 20 0 14 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 61 0 15 1 0 1 1 0 8 0 pfstkey 128 61 0 15 2 0 2 2 0 8 0 pfstate 448 61 0 15 6 0 6 6 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 524 0 99 29 2 27 29 0 8 0 art_table 40 527 0 99 5 0 5 5 0 8 0 art_node 32 130 0 31 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 10 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 19 0 10 1 0 1 1 0 8 0 shmpl 112 15 0 1 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2811 0 1312 96 0 96 96 0 8 0 ffsino 296 2811 0 1312 118 0 118 118 0 8 0 nchpl 144 3981 0 2283 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 1 0 1 0 8 0 vnodes 216 3319 0 0 185 0 185 185 0 8 0 namei 1024 13200 0 13200 2 1 1 1 0 8 1 percpumem 16 81 0 31 1 0 1 1 0 8 0 vcpupl 3968 3 0 1 1 0 1 1 0 8 0 vmpool 840 3 0 1 1 0 1 1 0 8 0 kstatmem 264 78 0 50 3 0 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 4 0 4 2 1 1 1 0 8 1 scxspl 216 17050 0 17050 12 8 4 8 1 8 4 plimitpl 152 121 0 103 1 0 1 1 0 8 0 sigapl 424 1100 0 1052 7 1 6 7 0 8 0 knotepl 120 520 0 0 16 0 16 16 0 8 0 kqueuepl 224 266 0 254 1 0 1 1 0 8 0 pipepl 344 243 0 216 9 6 3 9 0 8 0 fdescpl 528 1084 0 1052 3 0 3 3 0 8 0 filepl 160 6911 0 6689 21 5 16 20 0 8 6 lockfpl 104 418 0 416 2 1 1 2 0 8 0 lockfspl 48 107 0 105 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 45 0 28 1 0 1 1 0 8 0 ucredpl 104 812 0 799 1 0 1 1 0 8 0 zombiepl 144 1472 0 1471 1 0 1 1 0 8 0 processpl 1232 1100 0 1052 5 1 4 5 0 8 0 procpl 664 2282 0 2225 6 0 6 6 0 8 0 sosppl 176 8 0 8 1 0 1 1 0 8 1 sockpl 752 1903 0 1869 24 13 11 24 0 8 7 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 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 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 36 0 0 5 0 5 5 0 8 0 mtagpl 96 23 0 0 1 0 1 1 0 8 0 mbufpl 256 1153 0 0 73 0 73 73 0 8 0 bufpl 280 6261 0 131 438 0 438 438 0 8 0 anonpl 32 11151 0 0 90 0 90 90 0 246 0 amapchunkpl 152 31357 0 30846 38 11 27 37 0 158 5 amappl16 200 3754 0 3718 26 12 14 15 0 8 8 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl13 176 438 0 436 1 0 1 1 0 8 0 amappl12 168 1451 0 1408 3 0 3 3 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 49 0 35 1 0 1 1 0 8 0 amappl9 144 255 0 255 1 1 0 1 0 8 0 amappl8 136 29 0 27 1 0 1 1 0 8 0 amappl7 128 81 0 79 1 0 1 1 0 8 0 amappl6 120 297 0 282 1 0 1 1 0 8 0 amappl5 112 78 0 67 1 0 1 1 0 8 0 amappl4 104 435 0 402 1 0 1 1 0 8 0 amappl3 96 5277 0 5180 4 1 3 3 0 8 0 amappl2 88 1226 0 1145 2 0 2 2 0 8 0 amappl1 80 12741 0 12149 15 1 14 14 0 8 0 amappl 88 8509 0 8339 5 0 5 5 0 92 0 uvmvnodes 80 121 0 0 3 0 3 3 0 8 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 dma512 512 1 0 1 1 1 0 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 20 0 2 1 0 1 1 0 8 0 uaddrrnd 24 1084 0 1052 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1084 0 1052 1 0 1 1 0 8 0 vmmpekpl 168 11001 0 10970 3 0 3 3 0 8 0 vmmpepl 168 76335 0 74358 103 3 100 100 0 357 10 vmsppl 488 1083 0 1052 6 1 5 5 0 8 0 rwobjpl 80 23317 0 22237 29 1 28 28 0 8 1 pdppl 4096 2181 0 2108 99 26 73 83 0 8 0 pvpl 32 17204 0 0 140 1 139 139 0 265 0 pmappl 256 1086 0 1053 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 350 0 33 10 0 10 10 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff80003c4267f0,ffff80002ebdf0a0,ffff80002ebdeff0) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80002ebdf0a0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002ebdf0a0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x13c5e993100, 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 __mp_lock(ffffffff838b4240) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838b4240) at __mp_lock+0x192 sys/kern/kern_lock.c:165 __mp_acquire_count(ffffffff838b4240,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 biowait(fffffd806c21f488) at biowait+0xc6 sys/kern/vfs_bio.c:1242 bwrite(fffffd806c21f488) at bwrite+0x2e7 sys/kern/vfs_bio.c:754 ffs_write(ffff80003c466d50) at ffs_write+0x810 sys/ufs/ffs/ffs_vnops.c:377 VOP_WRITE(fffffd806641b5f8,ffff80003c466f08,7,fffffd80097fd4e0) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_write(fffffd8066864440,ffff80003c466f08,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80003a00cd18,4,ffff80003c466f08,0,ffff80003c466fc0) at dofilewritev+0x242 sys/kern/sys_generic.c:380 sys_write(ffff80003a00cd18,ffff80003c467070,ffff80003c466fc0) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff80003c467070) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c467070) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x24175a0030, count: -15