kernel: protection fault trap, code=0 Stopped at sys_semop+0x3d5: 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(ffff80002a260018,ffff80002ebc6610,ffff80002ebc6560) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80002ebc6610) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002ebc6610) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xeea086ddb20, count: -3 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002ebc6530 rbx 0xdeadbeefdeadbeef rdx 0 rcx 0xffff80002a260018 rax 0xdeadbeefdeadbeef r8 0x7f7fffffc000 r9 0x1 r10 0xadc702efbdf12347 r11 0xe3917237d0a26bd6 r12 0 r13 0xfffffd806c094d20 r14 0xffff80002ebc6610 r15 0 rip 0xffffffff82078ce5 sys_semop+0x3d5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002ebc6440 ss 0x10 sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{1}> show proc PROC (syz-executor) tid=501582 pid=41764 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a261770,0xffff80002a261cb0 process=0xffff8000fffec9b8 user=0xffff80002ebc1000, vmspace=0xfffffd806c4c53e8 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 41764 288108 53364 0 2 0 syz-executor *41764 501582 53364 0 7 0x4000000 syz-executor 41764 409179 53364 0 3 0x4000080 fsleep syz-executor 41764 418699 53364 0 3 0x4000080 fsleep syz-executor 52342 151732 24627 0 2 0 syz-executor 52342 446803 24627 0 3 0x4000080 fsleep syz-executor 56453 463321 62417 0 2 0 syz-executor 56453 318108 62417 0 3 0x4000080 fsleep syz-executor 98230 507447 5891 0 2 0 syz-executor 98230 55641 5891 0 3 0x4000080 fsleep syz-executor 98230 77409 5891 0 3 0x4000080 fsleep syz-executor 85239 141767 96415 0 7 0x1 syz-executor 85239 402884 96415 0 3 0x4000080 fsleep syz-executor 85239 197409 96415 0 3 0x4000080 fsleep syz-executor 30303 430690 93145 0 2 0 syz-executor 30303 480149 93145 0 2 0x4000001 syz-executor 30303 304562 93145 0 2 0x4000001 syz-executor 72216 91401 97802 0 3 0x80 nanoslp syz-executor 72216 426024 97802 0 3 0x4000080 kqread syz-executor 72216 384833 97802 0 3 0x4000080 fsleep syz-executor 53364 463021 18630 0 3 0x82 nanoslp syz-executor 31071 25624 1 0 3 0x100083 ttyin getty 62417 296481 18630 0 3 0x82 nanoslp syz-executor 97802 143030 18630 0 3 0x82 nanoslp syz-executor 32592 482423 18630 0 3 0x2 biowait syz-executor 93145 506382 18630 0 3 0x82 nanoslp syz-executor 5891 200864 18630 0 3 0x82 nanoslp syz-executor 24627 32806 18630 0 3 0x82 nanoslp syz-executor 96415 281738 18630 0 3 0x82 nanoslp syz-executor 18630 121886 73382 0 3 0x82 kqread syz-executor 73382 94470 21356 0 3 0x10008a sigsusp ksh 21356 119303 19033 0 3 0x98 kqread sshd-session 19033 88761 73763 0 3 0x92 kqread sshd-session 73763 407059 1 0 3 0x88 kqread sshd 30095 504594 42656 74 3 0x1100092 bpf pflogd 42656 468390 1 0 3 0x80 sbwait pflogd 58959 412201 59391 73 3 0x1100090 kqread syslogd 59391 130800 1 0 3 0x100082 sbwait syslogd 63500 145123 1 0 3 0x100080 kqread resolvd 20327 424101 22072 77 3 0x100092 kqread dhcpleased 47081 100554 22072 77 3 0x100092 kqread dhcpleased 22072 156586 1 0 3 0x80 kqread dhcpleased 78652 408003 0 0 3 0x14200 bored smr 58239 511775 0 0 3 0x14200 pgzero zerothread 72966 407318 0 0 3 0x14200 aiodoned aiodoned 33397 493650 0 0 3 0x14200 syncer update 83238 481600 0 0 3 0x14200 cleaner cleaner 21472 470114 0 0 3 0x14200 reaper reaper 48668 145402 0 0 3 0x14200 pgdaemon pagedaemon 63761 131430 0 0 3 0x14200 bored viomb 87901 64903 0 0 3 0x40014200 acpi0 acpi0 32774 25344 0 0 3 0x40014200 idle1 69802 164526 0 0 3 0x14200 bored softnet1 39758 145206 0 0 3 0x14200 bored softnet0 80025 431443 0 0 3 0x14200 bored systqmp 21463 385220 0 0 3 0x14200 bored systq 84407 207921 0 0 3 0x14200 tmoslp softclockmp 4496 252696 0 0 3 0x40014200 tmoslp softclock 36780 137958 0 0 3 0x40014200 idle0 1 282534 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 41764 (syz-executor) thread 0xffff80002a260018 (501582) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838ca488) #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 32592 (syz-executor) thread 0xffff80003abeb250 (482423) exclusive rrwlock inode r = 0 (0xfffffd806e915360) #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+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #11 namei+0x7ca sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806e75d118) #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+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 cache_lookup+0x351 sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x1e3 sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #10 namei+0x7ca sys/kern/vfs_lookup.c:250 #11 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #12 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #13 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11081 12109K 12516K 166960K 13706 0 pcb 17 18K 20K 166960K 531 0 rtable 224 11K 11K 166960K 885 0 pf 37 17K 19K 166960K 191 0 ifaddr 41 7K 8K 166960K 153 0 ifgroup 58 2K 2K 166960K 252 0 sysctl 4 1K 9K 166960K 88 0 counters 74 37K 38K 166960K 422 0 ioctlops 0 0K 4K 166960K 1895 0 iov 0 0K 20K 166960K 163 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1506 95K 95K 166960K 2705 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 31 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 72 0 dirhash 15 2K 2K 166960K 39 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 232K 166960K 2045 0 sigio 0 0K 0K 166960K 103 0 proc 72 115K 163K 166960K 832 0 subproc 72 4K 4K 166960K 118 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 558 0 in_multi 72 5K 7K 166960K 244 0 ether_multi 1 0K 0K 166960K 21 0 mrt 0 0K 0K 166960K 18 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 109 493K 493K 166960K 109 0 exec 0 0K 1K 166960K 885 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 6 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 263 170K 180K 166960K 20920 0 UVM aobj 33 12K 12K 166960K 39 0 pinsyscall 42 84K 102K 166960K 3318 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 118 0 NDP 14 0K 2K 166960K 106 0 temp 84 8680K 8764K 166960K 100412 0 kqueue 14 22K 30K 166960K 391 0 SYN cache 2 8K 16K 166960K 3 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 120 248 0 244 3 0 3 3 0 8 2 rtentry 176 220 0 133 6 0 6 6 0 8 0 unpcb 144 1795 0 1773 18 12 6 8 0 8 5 syncache 336 9 0 9 4 4 0 1 0 8 0 tcpqe 32 2 0 2 2 2 0 1 0 8 0 tcpcb 736 574 0 567 12 10 2 7 0 8 0 arp 136 32 0 16 1 0 1 1 0 8 0 inpcb 328 2359 0 2347 22 12 10 13 0 8 8 nd6 152 44 0 24 1 0 1 1 0 8 0 pkpcb 40 19 0 19 4 3 1 1 0 8 1 kcovpl 48 13 0 5 1 0 1 1 0 8 0 mppekey 1024 4 0 4 1 0 1 1 0 8 1 ppxss 1192 152 0 151 2 1 1 1 0 8 0 pppxif 1504 11 0 11 3 2 1 1 0 8 1 pffrag 232 17 0 5 1 0 1 1 0 482 0 pffrnode 88 15 0 4 1 0 1 1 0 8 0 pffrent 40 36 0 23 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 2 0 2 2 1 1 1 0 8 1 rttmr 136 5 0 5 5 4 1 1 0 8 1 art_heap8 4096 5 0 0 5 0 5 5 0 8 0 art_heap4 256 1015 0 688 34 11 23 31 0 8 0 art_table 40 1020 0 688 5 1 4 5 0 8 0 art_node 32 220 0 141 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 8 4 4 0 1 0 8 0 semapl 112 68 0 59 1 0 1 1 0 8 0 shmpl 112 27 0 2 1 0 1 1 0 8 0 dirhash 1024 36 0 17 3 0 3 3 0 8 0 dino2pl 256 5202 0 3691 95 0 95 95 0 8 0 ffsino 296 5202 0 3691 117 0 117 117 0 8 0 nchpl 144 7984 0 6263 64 0 64 64 0 8 0 rtmask 32 18 0 18 5 4 1 1 0 8 1 vnodes 216 5830 0 0 324 0 324 324 0 8 0 namei 1024 29663 0 29663 6 5 1 2 0 8 1 percpumem 16 226 0 174 1 0 1 1 0 8 0 vcpupl 3968 6 0 1 1 0 1 1 0 8 0 vmpool 848 9 0 4 1 0 1 1 0 8 0 kstatmem 264 164 0 132 3 0 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 8 0 8 3 2 1 1 0 8 1 scxspl 216 70748 0 70747 15 14 1 8 1 8 0 plimitpl 152 430 0 412 1 0 1 1 0 8 0 sigapl 424 2344 0 2297 9 2 7 8 0 8 0 knotepl 120 770 0 0 24 0 24 24 0 8 0 kqueuepl 224 737 0 726 9 4 5 5 0 8 4 pipepl 344 517 0 490 15 12 3 9 0 8 0 fdescpl 528 2303 0 2272 3 0 3 3 0 8 0 filepl 160 16552 0 16323 31 13 18 18 0 8 4 lockfpl 104 1029 0 1024 2 1 1 2 0 8 0 lockfspl 48 263 0 258 1 0 1 1 0 8 0 sessionpl 144 33 0 24 1 0 1 1 0 8 0 pgrppl 48 64 0 47 1 0 1 1 0 8 0 ucredpl 104 2137 0 2123 1 0 1 1 0 8 0 zombiepl 144 2864 0 2864 2 1 1 1 0 8 1 processpl 1232 2344 0 2297 6 0 6 6 0 8 0 procpl 664 5654 0 5594 8 2 6 8 0 8 0 sosppl 176 11 0 11 4 3 1 1 0 8 1 sockpl 752 4531 0 4493 45 33 12 23 0 8 8 mcl64k 65536 9 0 0 2 0 2 2 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 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 120 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 78 0 0 8 0 8 8 0 8 0 mtagpl 96 71 0 0 2 0 2 2 0 8 0 mbufpl 256 1170 0 0 73 0 73 73 0 8 0 bufpl 280 30964 0 24828 439 0 439 439 0 8 0 anonpl 32 19206 0 0 156 1 155 155 0 246 0 amapchunkpl 152 100358 0 99620 64 29 35 40 0 158 5 amappl16 200 9657 0 9596 91 68 23 44 0 8 8 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 6 0 6 1 1 0 1 0 8 0 amappl13 176 493 0 492 1 0 1 1 0 8 0 amappl12 168 2713 0 2671 3 0 3 3 0 8 0 amappl11 160 15 0 15 4 4 0 1 0 8 0 amappl10 152 51 0 37 1 0 1 1 0 8 0 amappl9 144 247 0 247 1 1 0 1 0 8 0 amappl8 136 31 0 28 1 0 1 1 0 8 0 amappl7 128 103 0 101 1 0 1 1 0 8 0 amappl6 120 358 0 344 1 0 1 1 0 8 0 amappl5 112 85 0 73 1 0 1 1 0 8 0 amappl4 104 485 0 455 1 0 1 1 0 8 0 amappl3 96 12356 0 12260 4 1 3 3 0 8 0 amappl2 88 2439 0 2361 2 0 2 2 0 8 0 amappl1 80 18418 0 17822 14 0 14 14 0 8 0 amappl 88 19736 0 19554 5 0 5 5 0 92 0 uvmvnodes 80 172 0 0 4 0 4 4 0 8 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 8 0 8 2 2 0 1 0 8 0 dma128 128 256 0 256 3 2 1 1 0 8 1 dma64 64 7 0 7 2 2 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 38 0 6 1 0 1 1 0 8 0 uaddrrnd 24 2303 0 2272 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2303 0 2272 1 0 1 1 0 8 0 vmmpekpl 168 18882 0 18817 4 0 4 4 0 8 0 vmmpepl 168 153307 0 151325 149 26 123 123 0 357 18 vmsppl 488 2302 0 2272 5 0 5 5 0 8 0 rwobjpl 80 43367 0 42180 45 4 41 41 0 8 8 pdppl 4096 4631 0 4557 121 45 76 83 0 8 2 pvpl 32 28073 0 0 227 1 226 226 0 265 0 pmappl 256 2311 0 2276 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 390 0 80 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff83838ff0) 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(ffffffff838ca280) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838ca280) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80002a39a2d0,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff838ca280) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838ca280) at __mp_lock+0x192 sys/kern/kern_lock.c:173 ktrsysret(ffff800032bcd778,ca,0,ffff80002a39a4c0) at ktrsysret+0xde ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff800032bcd778,ca,0,ffff80002a39a4c0) at ktrsysret+0xde sys/kern/kern_ktrace.c:209 syscall(ffff80002a39a570) at syscall+0xa50 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a39a570) at syscall+0xa50 sys/arch/amd64/amd64/trap.c:796 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x781bcb2004c0, count: -10 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{1}> trace sys_semop(ffff80002a260018,ffff80002ebc6610,ffff80002ebc6560) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80002ebc6610) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002ebc6610) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xeea086ddb20, count: -3