kernel: protection fault trap, code=0 Stopped at sys_semop+0x3f9: movzwl 0(%r15),%r12d 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(ffff80003980ad00,ffff80002a2e26a0,ffff80002a2e25f0) at sys_semop+0x3f9 sys/kern/sysv_sem.c:602 syscall(ffff80002a2e26a0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2e26a0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa5dcb839b90, count: -3 ddb{1}> show registers rdi 0 rsi 0x8f60 __ALIGN_SIZE+0x7f60 rbp 0xffff80002a2e25c0 rbx 0xffff80000149f404 rdx 0 rcx 0xffff80003980ad00 rax 0xffff8000299edff0 r8 0x7f7fffffc000 r9 0x1 r10 0x6e621f7eeaee6755 r11 0x88c207edc1c824e6 r12 0xffff80000149f404 r13 0xffff8f60 r14 0xbead __ALIGN_SIZE+0xaead r15 0xdeafbeaddeafbead rip 0xffffffff8116cb59 sys_semop+0x3f9 cs 0x8 rflags 0x10286 __ALIGN_SIZE+0xf286 rsp 0xffff80002a2e24a0 ss 0x10 sys_semop+0x3f9: movzwl 0(%r15),%r12d ddb{1}> show proc PROC (syz-executor) tid=326578 pid=18746 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=0xffff80003980aa70,0xffff80003980b750 process=0xffff80003c4bce20 user=0xffff80002a2dd000, vmspace=0xfffffd806bc677a0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 18746 116466 6914 0 3 0 futex syz-executor *18746 326578 6914 0 7 0x4000000 syz-executor 18746 95474 6914 0 2 0x4000000 syz-executor 6555 170971 21905 0 2 0 syz-executor 6555 232667 21905 0 3 0x4000080 kqsel syz-executor 6555 335092 21905 0 2 0x4000000 syz-executor 93494 460554 1511 0 2 0 syz-executor 93494 476271 1511 0 3 0x4000080 sbwait syz-executor 16888 278354 33092 0 3 0x80 nanoslp syz-executor 16888 426380 33092 0 3 0x4000080 kqsel syz-executor 16888 81770 33092 0 3 0x4000080 fsleep syz-executor 65663 150420 38599 0 3 0x80 nanoslp syz-executor 65663 132028 38599 0 3 0x4000080 kqsel syz-executor 65663 90583 38599 0 3 0x4000080 fsleep syz-executor 69221 322768 0 0 3 0x14200 acct acct 22942 26555 20261 0 3 0x82 sbwait sshd-session 6914 246384 22484 0 3 0x82 nanoslp syz-executor 36162 309437 22484 0 2 0x2 syz-executor 11614 379437 0 0 3 0x14200 bored sosplice 80066 433082 1 0 3 0x100083 ttyin getty 1511 83900 22484 0 3 0x82 nanoslp syz-executor 33092 182185 22484 0 7 0x3 syz-executor 21905 497732 22484 0 3 0x82 nanoslp syz-executor 38599 298281 22484 0 2 0x3 syz-executor 25783 406292 22484 0 2 0x2 syz-executor 56528 318904 22484 0 3 0x82 nanoslp syz-executor 22484 172715 77867 0 2 0x3 syz-executor 77867 357086 13913 0 3 0x10008a sigsusp ksh 13913 160834 84459 0 3 0x98 kqread sshd-session 84459 438713 20261 0 3 0x92 kqread sshd-session 20261 418635 1 0 3 0x88 kqread sshd 92445 240510 54334 74 3 0x1100092 bpf pflogd 54334 227937 1 0 3 0x80 sbwait pflogd 60035 491011 37167 73 3 0x1100090 kqread syslogd 37167 261000 1 0 3 0x100082 sbwait syslogd 98161 495940 1 0 3 0x100080 kqread resolvd 47713 439836 0 0 3 0x14200 bored smr 93053 489067 0 0 2 0x14200 zerothread 88457 253153 0 0 3 0x14200 aiodoned aiodoned 5640 165680 0 0 3 0x14200 syncer update 21613 479892 0 0 3 0x14200 cleaner cleaner 93009 217805 0 0 3 0x14200 reaper reaper 55610 143681 0 0 3 0x14200 pgdaemon pagedaemon 24923 279226 0 0 3 0x14200 bored viomb 85244 317132 0 0 3 0x40014200 acpi0 acpi0 86337 477243 0 0 3 0x40014200 idle1 1615 196677 0 0 3 0x14200 bored softnet3 13828 443886 0 0 3 0x14200 bored softnet2 85247 289270 0 0 3 0x14200 bored softnet1 93167 308604 0 0 3 0x14200 bored softnet0 14669 295901 0 0 3 0x14200 bored systqmp 95784 442181 0 0 3 0x14200 bored systq 22500 445218 0 0 3 0x14200 tmoslp softclockmp 1042 202500 0 0 3 0x40014200 tmoslp softclock 7850 446860 0 0 3 0x40014200 idle0 1 3198 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 18746 (syz-executor) thread 0xffff80003980ad00 (326578) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8393e770) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #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 18746 (syz-executor) thread 0xffff80003980b740 (95474) exclusive rwlock futex r = 0 (0xffffffff837d6838) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #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 93494 (syz-executor) thread 0xffff80003c4f67f0 (476271) exclusive rrwlock inode r = 0 (0xfffffd8068182e20) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1230 #6 ufs_lookup+0x16bc sys/ufs/ufs/ufs_lookup.c:573 #7 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #8 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #9 namei+0x7aa sys/kern/vfs_lookup.c:250 #10 vn_open+0x13f sys/kern/vfs_vnops.c:140 #11 vndioctl+0xcb1 sys/dev/vnd.c:457 #12 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #13 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 #14 sys_ioctl+0x5c3 sys/kern/sys_generic.c:-1 #15 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #15 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #16 Xsyscall+0x128 Process 25783 (syz-executor) thread 0xffff8000ffff2f70 (406292) exclusive rrwlock inode r = 0 (0xfffffd807b454c10) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3102 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10194 11107K 11925K 166960K 12078 0 pcb 19 18K 20K 166960K 370 0 rtable 246 10K 10K 166960K 538 0 pf 37 18K 22K 166960K 143 0 ifaddr 44 8K 8K 166960K 86 0 ifgroup 59 2K 2K 166960K 130 0 sysctl 4 1K 1K 166960K 6 0 counters 66 36K 37K 166960K 140 0 ioctlops 0 0K 4K 166960K 1732 0 iov 0 0K 16K 166960K 89 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1378 87K 87K 166960K 1948 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 10K 14K 166960K 21 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 174 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 110K 166960K 1150 0 sigio 0 0K 0K 166960K 22 0 proc 66 67K 140K 166960K 693 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 218 0 in_multi 99 7K 7K 166960K 150 0 ether_multi 1 0K 0K 166960K 6 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 582 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 229 147K 171K 166960K 12163 0 UVM aobj 38 5K 5K 166960K 41 0 pinsyscall 38 76K 108K 166960K 2311 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 66 0 NDP 13 0K 2K 166960K 56 0 temp 67 8685K 8776K 166960K 28100 0 kqueue 7 12K 30K 166960K 205 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 120 200 0 199 2 1 1 2 0 8 0 rtentry 176 165 0 57 6 0 6 6 0 8 0 unpcb 144 813 0 799 5 4 1 4 0 8 0 syncache 336 9 0 8 1 0 1 1 0 8 0 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 808 403 0 393 18 6 12 14 0 8 11 arp 128 30 0 10 1 0 1 1 0 8 0 inpcb 384 1430 0 1416 32 21 11 21 0 8 8 nd6 144 35 0 7 2 0 2 2 0 8 0 pkpcb 40 14 0 14 3 2 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1192 28 0 28 2 1 1 1 0 8 1 pppxif 1504 6 0 6 3 2 1 1 0 8 1 pffrag 232 3 0 1 1 0 1 1 0 482 0 pffrnode 88 3 0 1 1 0 1 1 0 8 0 pffrent 40 9 0 7 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 1 0 0 1 0 1 1 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 70 0 25 1 0 1 1 0 8 0 pfstkey 128 70 0 25 2 0 2 2 0 8 0 pfstate 384 70 0 25 5 0 5 5 0 8 0 pfrule 1344 22 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 628 0 175 30 1 29 30 0 8 0 art_table 32 630 0 175 4 0 4 4 0 8 0 art_node 16 161 0 66 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 9 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 112 169 0 160 1 0 1 1 0 8 0 shmpl 112 38 0 3 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 3382 0 1867 96 0 96 96 0 8 0 ffsino 288 3382 0 1867 109 0 109 109 0 8 0 nchpl 144 4960 0 3260 64 0 64 64 0 8 0 rtmask 32 4 0 4 2 1 1 1 0 8 1 uvmvnodes 80 3714 0 0 76 0 76 76 0 8 0 vnodes 216 3715 0 0 207 0 207 207 0 8 0 namei 1024 19162 0 19160 3 2 1 2 0 8 0 percpumem 16 84 0 37 1 0 1 1 0 8 0 kstatmem 264 72 0 46 2 0 2 2 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 2 0 2 2 2 0 1 0 8 0 scxspl 216 14984 0 14984 10 9 1 8 1 8 1 plimitpl 152 283 0 266 1 0 1 1 0 8 0 sigapl 424 1468 0 1419 10 1 9 9 0 8 1 futexpl 64 15456 0 15453 1 0 1 1 0 8 0 knotepl 120 506 0 0 15 0 15 15 0 8 0 kqueuepl 224 619 0 610 12 7 5 5 0 8 4 pipepl 336 263 0 236 8 5 3 8 0 8 0 fdescpl 520 1428 0 1399 3 0 3 3 0 8 0 filepl 160 10423 0 10210 24 6 18 18 0 8 5 lockfpl 104 441 0 440 2 1 1 2 0 8 0 lockfspl 48 100 0 99 1 0 1 1 0 8 0 sessionpl 144 30 0 21 1 0 1 1 0 8 0 pgrppl 48 60 0 43 1 0 1 1 0 8 0 ucredpl 104 1975 0 1964 1 0 1 1 0 8 0 zombiepl 144 1655 0 1653 1 0 1 1 0 8 0 processpl 1192 1468 0 1419 6 0 6 6 0 8 0 procpl 656 3161 0 3103 9 1 8 8 0 8 1 srpgc 96 4 0 4 2 2 0 1 0 8 0 sosppl 168 6 0 6 2 2 0 1 0 8 0 sockpl 728 2471 0 2442 32 20 12 21 0 8 8 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 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 123 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 31 0 0 4 0 4 4 0 8 0 mtagpl 96 16 0 0 1 0 1 1 0 8 0 mbufpl 256 446 0 0 28 0 28 28 0 8 0 bufpl 280 4193 0 132 291 0 291 291 0 8 0 anonpl 24 199114 0 195899 67 22 45 45 0 184 15 amapchunkpl 152 38688 0 38195 32 9 23 26 0 158 1 amappl16 200 3741 0 3710 35 25 10 15 0 8 7 amappl15 192 7 0 7 2 2 0 1 0 8 0 amappl14 184 156 0 146 1 0 1 1 0 8 0 amappl13 176 8 0 8 2 2 0 1 0 8 0 amappl12 168 2141 0 2112 4 1 3 3 0 8 0 amappl11 160 49 0 41 1 0 1 1 0 8 0 amappl10 152 7 0 6 2 1 1 1 0 8 0 amappl9 144 254 0 253 1 0 1 1 0 8 0 amappl8 136 40 0 38 1 0 1 1 0 8 0 amappl7 128 114 0 104 1 0 1 1 0 8 0 amappl6 120 207 0 202 1 0 1 1 0 8 0 amappl5 112 143 0 136 1 0 1 1 0 8 0 amappl4 104 343 0 322 1 0 1 1 0 8 0 amappl3 96 8078 0 7968 5 1 4 4 0 8 0 amappl2 88 698 0 647 2 0 2 2 0 8 0 amappl1 80 13400 0 12801 17 2 15 16 0 8 1 amappl 88 11232 0 11064 5 0 5 5 0 92 0 dma65536 65536 2 0 2 2 1 1 1 0 8 1 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma256 256 7 0 7 2 1 1 1 0 8 1 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 40 0 3 1 0 1 1 0 8 0 uaddrrnd 24 1428 0 1399 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1428 0 1399 1 0 1 1 0 8 0 vmmpekpl 168 13023 0 12972 3 0 3 3 0 8 0 vmmpepl 168 94787 0 92937 105 10 95 98 0 357 4 vmsppl 480 1427 0 1399 5 0 5 5 0 8 0 rwobjpl 72 29616 0 24956 88 0 88 88 0 8 0 pdppl 4096 2864 0 2798 122 52 70 86 0 8 4 pvpl 32 14499 0 0 118 1 117 117 0 265 0 pmappl 256 1427 0 1399 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 452 0 69 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff837b8ff0) 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(ffffffff8393e568) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8393e568) at __mp_lock+0x192 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff8393e568) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8393e568) at __mp_lock+0x192 sys/kern/kern_lock.c:144 ktrsyscall(ffff80002a2ba020,b,20,ffff80002a3be290) at ktrsyscall+0x2b3 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff80002a2ba020,b,20,ffff80002a3be290) at ktrsyscall+0x2b3 sys/kern/kern_ktrace.c:183 syscall(ffff80002a3be290) at syscall+0x2e6 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff80002a3be290) at syscall+0x2e6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6ff8240e7380, count: -10 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x3f9: movzwl 0(%r15),%r12d ddb{1}> trace sys_semop(ffff80003980ad00,ffff80002a2e26a0,ffff80002a2e25f0) at sys_semop+0x3f9 sys/kern/sysv_sem.c:602 syscall(ffff80002a2e26a0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2e26a0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa5dcb839b90, count: -3