kernel: protection fault trap, code=0 Stopped at sys_semop+0x45b: 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(ffff8000ffffacb8,ffff80003c5b7ce0,ffff80003c5b7c30) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80003c5b7ce0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5b7ce0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf2c7aea52a0, count: -3 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c5b7c00 rbx 0 rdx 0 rcx 0xffff8000ffffacb8 rax 0xdead4110dead4110 r8 0x7f7fffffc000 r9 0x1 r10 0xa78acc64179eb7ac r11 0x201c95b48736bce8 r12 0xffff800001303604 r13 0 r14 0xffff80003c5b7ce0 r15 0 rip 0xffffffff81f3af1b sys_semop+0x45b cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c5b7ae0 ss 0x10 sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{1}> show proc PROC (syz-executor) tid=3606 pid=74302 tcnt=4 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=0xffff8000ffffaf40,0xffff8000ffffcf48 process=0xffff80002f95cb68 user=0xffff80003c5b2000, vmspace=0xfffffd80640281f0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 74302 367745 80877 0 2 0 syz-executor *74302 3606 80877 0 7 0x4000000 syz-executor 74302 88268 80877 0 3 0x4000080 fsleep syz-executor 74302 347658 80877 0 3 0x4000080 fsleep syz-executor 81213 461195 66805 0 2 0 syz-executor 81213 216403 66805 0 3 0x4000080 fsleep syz-executor 73775 403694 60733 0 2 0 syz-executor 73775 157293 60733 0 3 0x4000080 fsleep syz-executor 94756 75946 6382 0 2 0 syz-executor 94756 495771 6382 0 3 0x4000080 fsleep syz-executor 9236 117411 24177 0 2 0x10 syz-executor 9236 13683 24177 0 3 0x4000090 fsleep syz-executor 5592 449026 3035 60928 2 0x10 syz-executor 5592 132965 3035 60928 7 0x4000010 syz-executor 5592 322052 3035 60928 3 0x4000090 fsleep syz-executor 5592 50632 3035 60928 3 0x4000090 fsleep syz-executor 76196 366290 0 0 3 0x14200 acct acct 38617 272031 1 0 3 0x100083 ttyin getty 28437 236731 0 0 3 0x14200 bored sosplice 76344 148851 4991 0 3 0x2 biowait syz-executor 3035 163189 4991 0 3 0x82 nanoslp syz-executor 6382 450722 4991 0 3 0x82 nanoslp syz-executor 60733 437970 4991 0 3 0x82 nanoslp syz-executor 80877 161612 4991 0 3 0x82 nanoslp syz-executor 69409 12848 4991 0 3 0x82 nanoslp syz-executor 66805 339064 4991 0 3 0x82 nanoslp syz-executor 24177 133466 4991 0 3 0x82 nanoslp syz-executor 4991 319951 93721 0 3 0x82 kqread syz-executor 93721 197125 39346 0 3 0x10008a sigsusp ksh 39346 277376 75823 0 3 0x98 kqread sshd-session 75823 46084 47009 0 3 0x92 kqread sshd-session 47009 51844 1 0 3 0x88 kqread sshd 46166 216061 72962 74 3 0x1100092 bpf pflogd 72962 159834 1 0 3 0x80 sbwait pflogd 31723 184194 91588 73 3 0x1100090 kqread syslogd 91588 424558 1 0 3 0x100082 sbwait syslogd 40141 300948 1 0 3 0x100080 kqread resolvd 5522 227060 61203 77 3 0x100092 kqread dhcpleased 43001 289588 61203 77 3 0x100092 kqread dhcpleased 61203 385283 1 0 3 0x80 kqread dhcpleased 91084 197762 0 0 3 0x14200 bored smr 44840 351414 0 0 2 0x14200 zerothread 50533 123878 0 0 3 0x14200 aiodoned aiodoned 12686 268267 0 0 3 0x14200 syncer update 36257 316751 0 0 3 0x14200 cleaner cleaner 46305 1212 0 0 3 0x14200 reaper reaper 33513 329243 0 0 3 0x14200 pgdaemon pagedaemon 34844 107036 0 0 3 0x14200 bored viomb 90501 358004 0 0 3 0x40014200 acpi0 acpi0 22887 272674 0 0 3 0x40014200 idle1 59065 92064 0 0 3 0x14200 bored softnet3 43067 311827 0 0 3 0x14200 bored softnet2 56459 14969 0 0 3 0x14200 bored softnet1 99753 135191 0 0 3 0x14200 bored softnet0 62633 301184 0 0 3 0x14200 bored systqmp 99689 513961 0 0 3 0x14200 bored systq 64366 143910 0 0 3 0x14200 tmoslp softclockmp 19601 108718 0 0 3 0x40014200 tmoslp softclock 27488 51188 0 0 3 0x40014200 idle0 1 132096 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 74302 (syz-executor) thread 0xffff8000ffffacb8 (3606) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff835e3950) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 __mp_acquire_count+0x58 #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 76344 (syz-executor) thread 0xffff8000ffffdbe0 (148851) exclusive rrwlock inode r = 0 (0xfffffd806f952870) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #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 vget+0x2bd sys/kern/vfs_subr.c:694 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1851 #13 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c21cbc8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #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 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1851 #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 10225 11029K 11347K 166960K 11762 0 pcb 21 12K 12K 166960K 69 0 rtable 224 6K 7K 166960K 441 0 pf 35 17K 20K 166960K 57 0 ifaddr 44 7K 7K 166960K 50 0 ifgroup 55 2K 2K 166960K 67 0 sysctl 3 1K 1K 166960K 3 0 counters 64 36K 36K 166960K 70 0 ioctlops 0 0K 4K 166960K 1508 0 iov 0 0K 12K 166960K 23 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1597 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 14 5K 5K 166960K 24 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 17 61K 89K 166960K 484 0 sigio 0 0K 0K 166960K 11 0 proc 73 91K 128K 166960K 558 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 34 0 in_multi 103 7K 7K 166960K 112 0 ether_multi 1 0K 0K 166960K 3 0 mrt 0 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 229 1023K 1023K 166960K 229 0 exec 0 0K 1K 166960K 428 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 239 73K 77K 166960K 6086 0 UVM aobj 14 2K 2K 166960K 14 0 pinsyscall 42 84K 105K 166960K 1581 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 15 0 NDP 13 0K 2K 166960K 32 0 temp 76 6900K 6976K 166960K 20674 0 kqueue 15 24K 26K 166960K 82 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 120 117 0 114 3 2 1 3 0 8 0 rtentry 112 120 0 15 4 0 4 4 0 8 0 unpcb 144 264 0 238 4 3 1 4 0 8 0 syncache 336 6 0 6 2 1 1 1 0 8 1 tcpqe 32 5 0 5 2 1 1 1 0 8 1 tcpcb 808 77 0 72 2 0 2 2 0 8 1 arp 120 21 0 1 1 0 1 1 0 8 0 inpcb 376 513 0 499 15 7 8 8 0 8 6 nd6 136 25 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 1 0 1 1 1 0 1 0 8 0 pfstscr 40 2 0 2 1 0 1 1 0 8 1 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 93 0 88 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 39 0 3 1 0 1 1 0 8 0 pfstkey 128 40 0 4 2 0 2 2 0 8 0 pfstate 376 40 0 4 4 0 4 4 0 8 0 pfrule 1344 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 506 0 43 30 1 29 29 0 8 0 art_table 32 507 0 43 4 0 4 4 0 8 0 art_node 16 119 0 26 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semapl 112 19 0 8 1 0 1 1 0 8 0 shmpl 112 11 0 0 1 0 1 1 0 8 0 dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 2184 0 682 95 0 95 95 0 8 0 ffsino 280 2184 0 682 108 0 108 108 0 8 0 nchpl 144 2855 0 1167 63 0 63 63 0 8 0 uvmvnodes 80 2410 0 0 50 0 50 50 0 8 0 vnodes 216 2410 0 0 134 0 134 134 0 8 0 namei 1024 9051 0 9051 2 1 1 2 0 8 1 percpumem 16 49 0 3 1 0 1 1 0 8 0 kstatmem 264 30 0 6 2 0 2 2 0 8 0 scxspl 216 8716 0 8715 9 2 7 7 1 8 6 plimitpl 152 119 0 102 1 0 1 1 0 8 0 sigapl 424 789 0 738 7 0 7 7 0 8 0 futexpl 64 5311 0 5303 1 0 1 1 0 8 0 knotepl 120 541 0 0 17 0 17 17 0 8 0 kqueuepl 216 122 0 111 1 0 1 1 0 8 0 pipepl 328 194 0 167 4 0 4 4 0 8 1 fdescpl 504 768 0 737 5 0 5 5 0 8 0 filepl 152 3922 0 3656 15 3 12 12 0 8 1 lockfpl 104 151 0 148 1 0 1 1 0 8 0 lockfspl 48 56 0 53 1 0 1 1 0 8 0 sessionpl 144 26 0 17 1 0 1 1 0 8 0 pgrppl 48 73 0 56 1 0 1 1 0 8 0 ucredpl 104 433 0 417 1 0 1 1 0 8 0 zombiepl 144 840 0 839 1 0 1 1 0 8 0 processpl 1168 789 0 738 5 1 4 5 0 8 0 procpl 648 1406 0 1345 6 0 6 6 0 8 0 sosppl 168 6 0 6 2 1 1 1 0 8 1 sockpl 688 899 0 856 16 7 9 10 0 8 5 mcl64k 65536 3 0 0 1 0 1 1 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 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 123 0 0 16 0 16 16 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 14 0 0 1 0 1 1 0 8 0 mbufpl 256 281 0 0 18 0 18 18 0 8 0 bufpl 280 2962 0 132 203 0 203 203 0 8 0 anonpl 24 124555 0 120957 56 10 46 47 0 185 15 amapchunkpl 152 19183 0 18636 30 4 26 26 0 158 3 amappl16 200 2056 0 2023 18 7 11 15 0 8 7 amappl15 192 9 0 8 1 0 1 1 0 8 0 amappl14 184 147 0 135 1 0 1 1 0 8 0 amappl13 176 1 0 1 1 1 0 1 0 8 0 amappl12 168 1411 0 1380 4 2 2 3 0 8 0 amappl11 160 48 0 34 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 251 0 251 1 1 0 1 0 8 0 amappl8 136 25 0 22 1 0 1 1 0 8 0 amappl7 128 109 0 96 1 0 1 1 0 8 0 amappl6 120 194 0 190 1 0 1 1 0 8 0 amappl5 112 123 0 112 1 0 1 1 0 8 0 amappl4 104 321 0 302 1 0 1 1 0 8 0 amappl3 96 3629 0 3505 4 0 4 4 0 8 0 amappl2 88 669 0 607 2 0 2 2 0 8 0 amappl1 80 9558 0 8987 15 0 15 15 0 8 0 amappl 88 5685 0 5502 5 0 5 5 0 92 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 128 253 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 13 0 0 1 0 1 1 0 8 0 uaddrrnd 24 768 0 737 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 768 0 737 1 0 1 1 0 8 0 vmmpekpl 168 8559 0 8524 3 0 3 3 0 8 0 vmmpepl 168 52844 0 50956 103 9 94 95 0 357 6 vmsppl 456 767 0 737 6 1 5 5 0 8 0 rwobjpl 64 19406 0 16025 56 0 56 56 0 8 1 pdppl 4096 1543 0 1474 105 34 71 85 0 8 2 pvpl 32 15261 0 0 125 1 124 124 0 265 0 pmappl 248 767 0 737 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 294 0 41 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(ffffffff834fdff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 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(ffffffff835e3748) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835e3748) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff800039d6de50,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff835e3748) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835e3748) at __mp_lock+0x192 sys/kern/kern_lock.c:144 syscall(ffff800039d6e020) at syscall+0xae6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039d6e020) at syscall+0xae6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xeab34a3a1c0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{1}> trace sys_semop(ffff8000ffffacb8,ffff80003c5b7ce0,ffff80003c5b7c30) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80003c5b7ce0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5b7ce0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf2c7aea52a0, count: -3