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(ffff800039018d20,ffff80003c4e5520,ffff80003c4e5470) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003c4e5520) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4e5520) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xeb37f8a1aa0, count: -3 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003c4e5440 rbx 0xdeadbeefdeadbeef rdx 0 rcx 0xffff800039018d20 rax 0xdeadbeefdeadbeef r8 0x7f7fffffc000 r9 0 r10 0xc9e4b00a492b52f7 r11 0xb00ab487659db878 r12 0 r13 0xfffffd805e7fc620 r14 0xffff80003c4e5520 r15 0 rip 0xffffffff8201b7d5 sys_semop+0x3d5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c4e5350 ss 0x10 sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{0}> show proc PROC (syz-executor) tid=182036 pid=9084 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=83, usrpri=83, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000390182c0,0xffff800039018568 process=0xffff800039427aa0 user=0xffff80003c4e0000, vmspace=0xfffffd805826c030 estcpu=33, cpticks=104, pctcpu=1.4, user=0, sys=0, intr=104 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 92725 410261 78534 0 7 0 syz-executor 92725 485910 78534 0 2 0x4000000 syz-executor 10670 463447 59280 0 2 0 syz-executor 55676 466170 23922 0 2 0 syz-executor 55676 518556 23922 0 3 0x4000080 fsleep syz-executor 70959 35787 29548 0 2 0 syz-executor 70959 54718 29548 0 3 0x4000080 ttyout syz-executor 9084 109205 70619 0 2 0 syz-executor * 9084 182036 70619 0 7 0x4000000 syz-executor 9084 69817 70619 0 3 0x4000080 fsleep syz-executor 9084 155357 70619 0 3 0x4000080 fsleep syz-executor 48165 377743 27241 0 2 0x4081000 syz-executor 48165 144290 27241 0 3 0x4003000 suspend syz-executor 70619 509571 63567 0 3 0x82 nanoslp syz-executor 6959 24248 1 0 3 0x100083 ttyopn getty 27303 218315 0 0 3 0x14280 nfsidl nfsio 85628 412796 0 0 3 0x14280 nfsidl nfsio 69280 327537 0 0 3 0x14280 nfsidl nfsio 3591 517749 0 0 3 0x14280 nfsidl nfsio 46974 369365 0 0 3 0x14200 bored sosplice 59280 232346 63567 0 3 0x82 nanoslp syz-executor 653 69208 63567 0 2 0x2 syz-executor 29548 87720 63567 0 3 0x82 nanoslp syz-executor 27241 338444 63567 0 3 0x82 wait syz-executor 34908 234049 63567 0 3 0x82 nanoslp syz-executor 23922 34333 63567 0 3 0x82 nanoslp syz-executor 78534 65673 63567 0 3 0x82 nanoslp syz-executor 63567 251522 89095 0 3 0x82 kqread syz-executor 89095 33359 46191 0 3 0x10008a sigsusp ksh 46191 341083 41744 0 3 0x98 kqread sshd-session 41744 417265 99468 0 3 0x92 kqread sshd-session 99468 163285 1 0 3 0x88 kqread sshd 86119 189598 87367 74 3 0x1100092 bpf pflogd 87367 190218 1 0 3 0x80 sbwait pflogd 7760 448934 9547 73 3 0x1100090 kqread syslogd 9547 447658 1 0 3 0x100082 sbwait syslogd 70079 118955 1 0 3 0x100080 kqread resolvd 12491 180296 1780 77 3 0x100092 kqread dhcpleased 46862 505478 1780 77 3 0x100092 kqread dhcpleased 1780 428528 1 0 3 0x80 kqread dhcpleased 70361 507920 0 0 3 0x14200 bored smr 92720 367167 0 0 2 0x14200 zerothread 20417 153591 0 0 3 0x14200 aiodoned aiodoned 46885 470541 0 0 3 0x14200 syncer update 8134 297354 0 0 3 0x14200 cleaner cleaner 94160 131454 0 0 3 0x14200 reaper reaper 48662 318370 0 0 3 0x14200 pgdaemon pagedaemon 32306 293856 0 0 3 0x14200 bored viomb 80512 109103 0 0 3 0x40014200 acpi0 acpi0 99874 488279 0 0 3 0x40014200 idle1 52901 327562 0 0 3 0x14200 bored softnet7 55134 265516 0 0 3 0x14200 bored softnet6 50782 505358 0 0 3 0x14200 bored softnet5 45397 291703 0 0 3 0x14200 bored softnet4 42007 179628 0 0 3 0x14200 bored softnet3 44043 442600 0 0 3 0x14200 bored softnet2 84028 7060 0 0 3 0x14200 bored softnet1 23655 33607 0 0 3 0x14200 bored softnet0 44480 24657 0 0 3 0x14200 bored systqmp 98111 249242 0 0 3 0x14200 bored systq 14838 145155 0 0 3 0x14200 tmoslp softclockmp 91155 225727 0 0 3 0x40014200 tmoslp softclock 34636 420744 0 0 3 0x40014200 idle0 1 112340 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 9084 (syz-executor) thread 0xffff800039018d20 (182036) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83997fc0) #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 48165 (syz-executor) thread 0xffff800039019cb0 (377743) exclusive rrwlock inode r = 0 (0xfffffd806e0d0dd0) #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 Process 653 (syz-executor) thread 0xffff8000ffff3768 (69208) exclusive rwlock vmmaplk r = 0 (0xfffffd805826c6e8) #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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5168 #3 uvmspace_fork+0x12b sys/uvm/uvm_map.c:3738 #4 process_new+0x577 sys/kern/kern_fork.c:282 #5 fork1+0x3f6 sys/kern/kern_fork.c:-1 #6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #7 Xsyscall+0x128 exclusive rwlock vmmaplk r = 0 (0xfffffd806ef968a8) #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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5168 #3 uvmspace_fork+0x44 sys/uvm/uvm_map.c:3729 #4 process_new+0x577 sys/kern/kern_fork.c:282 #5 fork1+0x3f6 sys/kern/kern_fork.c:-1 #6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10229 11167K 11724K 166960K 12898 0 pcb 17 13K 13K 166960K 247 0 rtable 191 9K 10K 166960K 450 0 pf 42 19K 83K 166960K 191 0 ifaddr 40 6K 8K 166960K 119 0 ifgroup 63 2K 3K 166960K 211 0 sysctl 4 1K 9K 166960K 12 0 counters 72 37K 38K 166960K 348 0 ioctlops 0 0K 4K 166960K 1756 0 iov 0 0K 24K 166960K 86 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1369 86K 87K 166960K 2425 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 22 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 53 0 dirhash 12 2K 2K 166960K 33 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 1346 0 sigio 0 0K 0K 166960K 15 0 proc 72 115K 180K 166960K 754 0 subproc 72 4K 4K 166960K 91 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 134 0 in_multi 82 5K 7K 166960K 178 0 ether_multi 2 0K 0K 166960K 15 0 mrt 1 0K 0K 166960K 13 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 547 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 248 160K 181K 166960K 13779 0 UVM aobj 104 6K 6K 166960K 112 0 pinsyscall 43 86K 101K 166960K 2505 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 72 0 NDP 14 0K 2K 166960K 83 0 temp 79 8652K 8728K 166960K 54485 0 kqueue 13 20K 30K 166960K 254 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 120 146 0 143 2 1 1 2 0 8 0 rtentry 176 146 0 73 5 0 5 5 0 8 0 unpcb 144 883 0 864 7 6 1 6 0 8 0 syncache 336 15 0 15 2 1 1 1 0 8 1 tcpqe 32 4 0 4 2 1 1 1 0 8 1 tcpcb 736 397 0 388 7 5 2 4 0 8 1 arp 128 14 0 6 1 0 1 1 0 8 0 inpcb 328 1584 0 1572 16 11 5 7 0 8 3 nd6 144 26 0 10 1 0 1 1 0 8 0 pkpcb 40 45 0 45 4 3 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 120 0 120 3 2 1 1 0 8 1 pppxif 1504 9 0 9 4 3 1 1 0 8 1 pfstscr 40 5 0 5 2 2 0 1 0 8 0 pffrag 232 10 0 1 1 0 1 1 0 482 0 pffrnode 88 8 0 1 1 0 1 1 0 8 0 pffrent 40 14 0 4 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 pfanchor 1288 3 0 0 1 0 1 1 0 8 0 pftag 88 1 0 1 1 1 0 1 0 8 0 pfstitem 24 82 0 28 1 0 1 1 0 8 0 pfstkey 128 88 0 34 2 0 2 2 0 8 0 pfstate 384 86 0 32 6 0 6 6 0 8 0 pfrule 1344 30 0 25 2 1 1 2 0 8 0 rttmr 136 2 0 2 1 1 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 686 0 342 32 7 25 29 0 8 1 art_table 40 689 0 342 5 0 5 5 0 8 0 art_node 32 146 0 82 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 6 1 1 0 1 0 8 0 semupl 112 4 0 4 2 1 1 1 0 8 1 semapl 112 49 0 40 1 0 1 1 0 8 0 shmpl 112 109 0 8 3 0 3 3 0 8 0 dirhash 1024 31 0 14 3 0 3 3 0 8 0 dino2pl 256 3908 0 2395 95 0 95 95 0 8 0 ffsino 296 3908 0 2395 117 0 117 117 0 8 0 nchpl 144 5709 0 4009 64 0 64 64 0 8 0 rtmask 32 10 0 10 4 3 1 1 0 8 1 uvmvnodes 80 4530 0 0 93 0 93 93 0 8 0 vnodes 216 4530 0 0 252 0 252 252 0 8 0 namei 1024 19763 0 19763 3 1 2 2 0 8 2 percpumem 16 189 0 138 1 0 1 1 0 8 0 kstatmem 264 132 0 98 4 1 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 3 0 3 3 2 1 1 0 8 1 scxspl 216 37522 0 37522 13 9 4 8 1 8 4 plimitpl 152 238 0 219 1 0 1 1 0 8 0 sigapl 424 1643 0 1584 9 1 8 9 0 8 0 knotepl 120 575 0 0 18 0 18 18 0 8 0 kqueuepl 224 451 0 441 6 4 2 2 0 8 1 pipepl 344 285 0 257 3 0 3 3 0 8 0 fdescpl 528 1598 0 1566 3 0 3 3 0 8 0 filepl 160 10420 0 10067 24 8 16 17 0 8 0 lockfpl 104 651 0 647 1 0 1 1 0 8 0 lockfspl 48 233 0 229 1 0 1 1 0 8 0 sessionpl 144 36 0 27 1 0 1 1 0 8 0 pgrppl 48 59 0 42 1 0 1 1 0 8 0 ucredpl 104 1448 0 1435 1 0 1 1 0 8 0 zombiepl 144 1967 0 1965 1 0 1 1 0 8 0 processpl 1248 1643 0 1584 7 1 6 7 0 8 0 procpl 664 3635 0 3568 8 0 8 8 0 8 0 sosppl 168 16 0 16 4 3 1 1 0 8 1 sockpl 752 2688 0 2654 27 18 9 17 0 8 4 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 55 0 0 7 0 7 7 0 8 0 mtagpl 96 15 0 0 1 0 1 1 0 8 0 mbufpl 256 249 0 0 15 0 15 15 0 8 0 bufpl 280 15199 0 9056 440 0 440 440 0 8 0 anonpl 32 16237 0 0 132 1 131 131 0 246 0 amapchunkpl 152 51859 0 51226 47 15 32 35 0 158 3 amappl16 200 5708 0 5574 60 39 21 38 0 8 12 amappl15 192 2 0 2 1 1 0 1 0 8 0 amappl14 184 138 0 126 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 2295 0 2264 4 1 3 3 0 8 0 amappl11 160 53 0 39 1 0 1 1 0 8 0 amappl10 152 9 0 9 1 1 0 1 0 8 0 amappl9 144 255 0 255 1 1 0 1 0 8 0 amappl8 136 28 0 25 1 0 1 1 0 8 0 amappl7 128 124 0 112 1 0 1 1 0 8 0 amappl6 120 208 0 204 1 0 1 1 0 8 0 amappl5 112 135 0 126 1 0 1 1 0 8 0 amappl4 104 348 0 330 1 0 1 1 0 8 0 amappl3 96 9216 0 9104 5 1 4 4 0 8 0 amappl2 88 762 0 700 2 0 2 2 0 8 0 amappl1 80 15989 0 15385 15 0 15 15 0 8 0 amappl 88 12760 0 12586 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 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 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 255 0 255 2 2 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 20 0 19 1 0 1 1 0 8 0 aobjpl 72 111 0 8 2 0 2 2 0 8 0 uaddrrnd 24 1598 0 1566 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1598 0 1566 1 0 1 1 0 8 0 vmmpekpl 168 14891 0 14843 4 1 3 3 0 8 0 vmmpepl 168 109642 0 107521 124 15 109 120 0 357 6 vmsppl 488 1597 0 1566 7 2 5 5 0 8 0 rwobjpl 80 35788 0 30108 121 0 121 121 0 8 0 pdppl 4096 3204 0 3132 112 38 74 84 0 8 2 pvpl 32 24968 0 0 204 2 202 202 0 265 0 pmappl 256 1597 0 1566 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 305 0 57 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff800039018d20,ffff80003c4e5520,ffff80003c4e5470) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003c4e5520) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4e5520) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xeb37f8a1aa0, 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 end of kernel end trace frame: 0x771ecf497440, count: -3