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(ffff8000ffff2548,ffff80003c493300,ffff80003c493250) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003c493300) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c493300) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5c677fd38e0, count: -3 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c493220 rbx 0xdeaf4152deaf4152 rdx 0 rcx 0xffff8000ffff2548 rax 0xdeaf4152deaf4152 r8 0x7f7fffffc000 r9 0xfffffd80097fd548 r10 0x5d9a9f9fcc0237b5 r11 0x9c0e44169b3a34ad r12 0 r13 0xfffffd806bf63c40 r14 0xffff80003c493300 r15 0 rip 0xffffffff8268fa15 sys_semop+0x3d5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c493130 ss 0x10 sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{1}> show proc PROC (syz-executor) tid=72303 pid=86424 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=0xffff80003c43d250,0xffff8000ffff3a18 process=0xffff80003c423040 user=0xffff80003c48e000, vmspace=0xfffffd806cb053e8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 86424 309903 78703 0 2 0 syz-executor *86424 72303 78703 0 7 0x4000000 syz-executor 86424 249788 78703 0 7 0x4000000 syz-executor 51965 403923 17660 0 2 0 syz-executor 51965 153025 17660 0 3 0x4000080 bell syz-executor 51965 441813 17660 0 3 0x4000080 fsleep syz-executor 54465 478363 11357 0 3 0x80 nanoslp syz-executor 54465 252116 11357 0 3 0x4000080 kqsel syz-executor 54465 370703 11357 0 3 0x4000080 fsleep syz-executor 54465 317087 11357 0 3 0x4000080 fsleep syz-executor 69917 136618 55292 0 3 0x80 nanoslp syz-executor 69917 522970 55292 0 3 0x4000080 ttyout syz-executor 95155 298219 0 0 3 0x14200 acct acct 77660 54639 0 0 3 0x14280 nfsidl nfsio 10535 487988 1 0 3 0x100083 ttyin getty 52757 312044 1444 0 3 0x100082 sbwait arp 1444 378682 17676 0 3 0x10008a sigsusp sh 17660 374922 46589 0 3 0x82 nanoslp syz-executor 78703 123360 46589 0 3 0x82 nanoslp syz-executor 17676 21180 46589 0 3 0x82 wait syz-executor 50797 87561 46589 0 2 0x2 syz-executor 11357 495213 46589 0 3 0x82 nanoslp syz-executor 55292 263276 46589 0 3 0x82 nanoslp syz-executor 45927 135286 46589 0 3 0x82 nanoslp syz-executor 53033 273739 46589 0 3 0x82 wait syz-executor 46589 383548 12233 0 3 0x82 kqread syz-executor 12233 224097 19139 0 3 0x10008a sigsusp ksh 19139 337326 88764 0 3 0x98 kqread sshd-session 88764 385088 74121 0 3 0x92 kqread sshd-session 74121 245652 1 0 3 0x88 kqread sshd 44160 515950 44604 74 3 0x1100092 bpf pflogd 44604 181699 1 0 3 0x80 sbwait pflogd 87583 321891 60886 73 3 0x1100090 kqread syslogd 60886 4188 1 0 3 0x100082 sbwait syslogd 70403 440735 1 0 3 0x100080 kqread resolvd 92441 281468 3955 77 3 0x100092 kqread dhcpleased 93196 403321 3955 77 3 0x100092 kqread dhcpleased 3955 232186 1 0 3 0x80 kqread dhcpleased 2671 147309 0 0 3 0x14200 bored smr 86413 72089 0 0 2 0x14200 zerothread 41635 238209 0 0 3 0x14200 aiodoned aiodoned 84162 171235 0 0 3 0x14200 syncer update 75225 369786 0 0 3 0x14200 cleaner cleaner 92158 504049 0 0 3 0x14200 reaper reaper 25841 378600 0 0 3 0x14200 pgdaemon pagedaemon 90336 419461 0 0 3 0x14200 bored viomb 70705 93829 0 0 3 0x40014200 acpi0 acpi0 67313 371631 0 0 3 0x40014200 idle1 84668 63579 0 0 3 0x14200 bored softnet1 23220 475446 0 0 3 0x14200 bored softnet0 26681 82927 0 0 3 0x14200 bored systqmp 41895 318446 0 0 3 0x14200 bored systq 85120 178328 0 0 3 0x14200 tmoslp softclockmp 92053 116731 0 0 3 0x40014200 tmoslp softclock 85242 417251 0 0 3 0x40014200 idle0 1 376789 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 86424 (syz-executor) thread 0xffff8000ffff2548 (72303) 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 50797 (syz-executor) thread 0xffff8000ffff3ca0 (87561) exclusive rrwlock inode r = 0 (0xfffffd806dc4e8e8) #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 domkdirat+0x8b sys/kern/vfs_syscalls.c:3098 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10222 11167K 12461K 166960K 13128 0 pcb 17 15K 16K 166960K 182 0 rtable 231 10K 11K 166960K 867 0 pf 42 19K 82K 166960K 170 0 ifaddr 41 7K 7K 166960K 87 0 ifgroup 66 2K 3K 166960K 150 0 sysctl 4 1K 9K 166960K 15 0 counters 74 37K 38K 166960K 166 0 ioctlops 0 0K 4K 166960K 1717 0 iov 0 0K 24K 166960K 46 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1529 96K 97K 166960K 2396 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 28 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 114K 166960K 927 0 sigio 0 0K 0K 166960K 14 0 proc 72 115K 180K 166960K 618 0 subproc 72 4K 4K 166960K 74 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 99 0 in_multi 78 5K 6K 166960K 119 0 ether_multi 1 0K 0K 166960K 7 0 mrt 1 0K 0K 166960K 8 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 466 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 263 154K 172K 166960K 10601 0 UVM aobj 20 10K 10K 166960K 21 0 pinsyscall 44 88K 110K 166960K 2042 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 101 0 NDP 14 0K 1K 166960K 60 0 temp 57 8674K 8745K 166960K 58107 0 kqueue 13 20K 28K 166960K 166 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 120 101 0 95 1 0 1 1 0 8 0 rtentry 176 327 0 237 5 0 5 5 0 8 0 unpcb 144 503 0 486 5 4 1 5 0 8 0 syncache 336 6 0 6 2 2 0 1 0 8 0 tcpcb 736 304 0 299 7 0 7 7 0 8 6 arp 136 88 0 71 1 0 1 1 0 8 0 inpcb 328 1087 0 1079 13 6 7 7 0 8 5 nd6 152 22 0 3 1 0 1 1 0 8 0 pkpcb 40 10 0 10 3 3 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 39 0 39 3 2 1 1 0 8 1 pppxif 1504 3 0 3 1 0 1 1 0 8 1 pfstscr 40 7 0 6 2 1 1 1 0 8 0 pffrag 232 7 0 2 1 0 1 1 0 482 0 pffrnode 88 7 0 2 1 0 1 1 0 8 0 pffrent 40 17 0 11 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 pftag 88 4 0 1 1 0 1 1 0 8 0 pfstitem 24 68 0 25 1 0 1 1 0 8 0 pfstkey 128 71 0 28 2 0 2 2 0 8 0 pfstate 448 69 0 28 5 0 5 5 0 8 0 pfrule 1344 26 0 21 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 256 590 0 228 28 4 24 28 0 8 0 art_table 40 593 0 228 5 0 5 5 0 8 0 art_node 32 327 0 247 3 1 2 3 0 8 0 sysvmsgpl 40 7 0 3 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 22 0 13 1 0 1 1 0 8 0 shmpl 112 13 0 0 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 3144 0 1642 95 0 95 95 0 8 0 ffsino 296 3144 0 1642 117 0 117 117 0 8 0 nchpl 144 4448 0 2753 64 0 64 64 0 8 0 rtmask 32 8 0 8 3 2 1 1 0 8 1 vnodes 216 3900 0 0 217 0 217 217 0 8 0 namei 1024 14747 0 14746 2 1 1 1 0 8 0 percpumem 16 98 0 46 1 0 1 1 0 8 0 vcpupl 3968 4 0 0 1 0 1 1 0 8 0 vmpool 840 5 0 1 1 0 1 1 0 8 0 kstatmem 264 98 0 64 4 1 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 5 0 5 3 3 0 1 0 8 0 scxspl 216 17828 0 17828 11 10 1 8 1 8 1 plimitpl 152 273 0 254 1 0 1 1 0 8 0 sigapl 424 1239 0 1189 7 0 7 7 0 8 0 knotepl 120 480 0 0 15 0 15 15 0 8 0 kqueuepl 224 551 0 541 10 5 5 5 0 8 4 pipepl 344 188 0 161 3 0 3 3 0 8 0 fdescpl 528 1208 0 1176 3 0 3 3 0 8 0 filepl 160 7827 0 7567 20 5 15 15 0 8 4 lockfpl 104 450 0 448 2 0 2 2 0 8 1 lockfspl 48 141 0 139 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 43 0 26 1 0 1 1 0 8 0 ucredpl 104 1147 0 1133 1 0 1 1 0 8 0 zombiepl 144 1685 0 1682 1 0 1 1 0 8 0 processpl 1232 1239 0 1189 5 0 5 5 0 8 0 procpl 664 2700 0 2641 6 0 6 6 0 8 0 sosppl 176 7 0 7 3 2 1 1 0 8 1 sockpl 752 1716 0 1685 22 11 11 17 0 8 7 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 113 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 71 0 0 7 0 7 7 0 8 0 mtagpl 96 59 0 0 2 0 2 2 0 8 0 mbufpl 256 432 0 0 27 0 27 27 0 8 0 bufpl 280 6268 0 135 439 0 439 439 0 8 0 anonpl 32 13446 0 0 109 0 109 109 0 246 0 amapchunkpl 152 35109 0 34524 36 9 27 35 0 158 1 amappl16 200 3774 0 3690 28 17 11 22 0 8 0 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 3 0 3 1 1 0 1 0 8 0 amappl13 176 421 0 418 1 0 1 1 0 8 0 amappl12 168 1586 0 1542 3 0 3 3 0 8 0 amappl11 160 63 0 63 1 1 0 1 0 8 0 amappl10 152 53 0 38 1 0 1 1 0 8 0 amappl9 144 252 0 252 1 1 0 1 0 8 0 amappl8 136 52 0 48 1 0 1 1 0 8 0 amappl7 128 93 0 92 1 0 1 1 0 8 0 amappl6 120 280 0 265 1 0 1 1 0 8 0 amappl5 112 115 0 104 1 0 1 1 0 8 0 amappl4 104 439 0 408 1 0 1 1 0 8 0 amappl3 96 6042 0 5945 4 1 3 3 0 8 0 amappl2 88 1344 0 1267 2 0 2 2 0 8 0 amappl1 80 12844 0 12221 16 1 15 15 0 8 0 amappl 88 9719 0 9538 5 0 5 5 0 92 0 uvmvnodes 80 120 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 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 256 0 256 3 3 0 1 0 8 0 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 20 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1208 0 1176 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1208 0 1176 1 0 1 1 0 8 0 vmmpekpl 168 11502 0 11462 3 0 3 3 0 8 0 vmmpepl 168 83166 0 81137 110 12 98 105 0 357 4 vmsppl 488 1207 0 1176 5 0 5 5 0 8 0 rwobjpl 80 24520 0 23337 31 3 28 31 0 8 0 pdppl 4096 2433 0 2358 107 30 77 85 0 8 2 pvpl 32 21621 0 0 176 1 175 175 0 265 0 pmappl 256 1212 0 1177 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 310 0 39 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(ffffffff83861ff0) 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 vn_write(fffffd806c8584a0,ffff80003c439658,0) at vn_write+0x4e sys/kern/vfs_vnops.c:393 dofilewritev(ffff8000ffff3a08,c8,ffff80003c439658,0,ffff80003c439710) at dofilewritev+0x242 sys/kern/sys_generic.c:380 sys_write(ffff8000ffff3a08,ffff80003c4397c0,ffff80003c439710) at sys_write+0xa2 sys/kern/sys_generic.c:300 syscall(ffff80003c4397c0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4397c0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5c6556d4190, count: -9 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{1}> trace sys_semop(ffff8000ffff2548,ffff80003c493300,ffff80003c493250) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003c493300) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c493300) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5c677fd38e0, count: -3