kernel: protection fault trap, code=0 Stopped at sys_semop+0x352: movzwl 0x8(%rbx),%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(ffff80003c4587f0,ffff80003c03fcd0,ffff80003c03fc20) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80003c03fcd0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c03fcd0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdbfa6b78680, count: -3 ddb{1}> show registers rdi 0 rsi 0xb rbp 0xffff80003c03fbf0 rbx 0xdeaf4152deaf4152 rdx 0 rcx 0xffff80003c4587f0 rax 0xffff8000299edff0 r8 0x7f7fffffc000 r9 0x1 r10 0xe2d83d49829a2916 r11 0x768afb23d6d04872 r12 0xb r13 0xfffffd8068927a10 r14 0xffff80003c03fcd0 r15 0xb rip 0xffffffff827d2a32 sys_semop+0x352 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c03fb00 ss 0x10 sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> show proc PROC (syz-executor) tid=362461 pid=56549 tcnt=4 stat=onproc flags process=10 proc=4000000 runpri=73, usrpri=73, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c459250,0xffff80003c458038 process=0xffff800036c24020 user=0xffff80003c03a000, vmspace=0xfffffd8068b5fb98 estcpu=23, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 85355 274706 76280 0 7 0 syz-executor 85355 249197 76280 0 2 0x4000000 syz-executor 29139 295292 9776 0 2 0 syz-executor 29139 444292 9776 0 2 0x4000000 syz-executor 29139 410978 9776 0 3 0x4000080 fsleep syz-executor 56549 407365 24851 60929 2 0x10 syz-executor *56549 362461 24851 60929 7 0x4000010 syz-executor 56549 20293 24851 60929 3 0x4000090 msgwait syz-executor 56549 52611 24851 60929 3 0x4000090 fsleep syz-executor 96132 243705 28242 0 3 0x80 nanoslp syz-executor 96132 247747 28242 0 3 0x4000080 ttyin syz-executor 96132 430430 28242 0 3 0x4000080 fsleep syz-executor 53942 40218 16477 0 2 0 syz-executor 53942 470925 16477 0 3 0x4000080 fsleep syz-executor 53942 119013 16477 0 3 0x4000080 fsleep syz-executor 53942 135047 16477 0 3 0x4000080 fsleep syz-executor 70741 450201 75584 0 2 0x2 syz-executor 29261 193018 21277 0 3 0x80 nanoslp syz-executor 29261 9139 21277 0 3 0x4000080 ttyin syz-executor 29261 269103 21277 0 3 0x4000080 fsleep syz-executor 24851 270280 75584 0 3 0x82 nanoslp syz-executor 68871 371856 75584 0 3 0x82 nanoslp syz-executor 21277 95586 75584 0 3 0x82 nanoslp syz-executor 9776 227549 75584 0 3 0x82 nanoslp syz-executor 28242 168254 75584 0 3 0x82 nanoslp syz-executor 76280 501409 75584 0 3 0x82 nanoslp syz-executor 16477 475862 75584 0 3 0x82 nanoslp syz-executor 75584 249741 92463 0 3 0x82 kqread syz-executor 92463 242393 23190 0 3 0x10008a sigsusp ksh 23190 481204 73784 0 3 0x98 kqread sshd-session 73784 139840 1543 0 3 0x92 kqread sshd-session 77261 284462 1 0 3 0x100083 ttyin getty 1543 454300 1 0 3 0x88 kqread sshd 75196 177318 3137 74 3 0x1100092 bpf pflogd 3137 164504 1 0 3 0x80 sbwait pflogd 72609 520691 82484 73 3 0x1100090 kqread syslogd 82484 138159 1 0 3 0x100082 sbwait syslogd 81832 463967 1 0 3 0x100080 kqread resolvd 20839 152715 96799 77 3 0x100092 kqread dhcpleased 59477 227562 96799 77 3 0x100092 kqread dhcpleased 96799 117307 1 0 3 0x80 kqread dhcpleased 15193 178119 0 0 3 0x14200 bored smr 13593 134439 0 0 2 0x14200 zerothread 98265 29953 0 0 3 0x14200 aiodoned aiodoned 41242 113888 0 0 3 0x14200 syncer update 89696 94654 0 0 3 0x14200 cleaner cleaner 88921 120251 0 0 3 0x14200 reaper reaper 47983 293793 0 0 3 0x14200 pgdaemon pagedaemon 61958 332187 0 0 3 0x14200 bored viomb 82477 68208 0 0 3 0x40014200 acpi0 acpi0 51697 163486 0 0 3 0x40014200 idle1 29290 522637 0 0 3 0x14200 bored softnet7 54132 417030 0 0 3 0x14200 bored softnet6 2963 230369 0 0 3 0x14200 bored softnet5 78622 336953 0 0 3 0x14200 bored softnet4 52 211394 0 0 3 0x14200 bored softnet3 49989 119674 0 0 3 0x14200 bored softnet2 13741 327867 0 0 3 0x14200 bored softnet1 86243 322192 0 0 3 0x14200 bored softnet0 17188 240580 0 0 3 0x14200 bored systqmp 7153 306289 0 0 3 0x14200 bored systq 50925 324666 0 0 3 0x14200 tmoslp softclockmp 51836 52598 0 0 3 0x40014200 tmoslp softclock 26044 495843 0 0 3 0x40014200 idle0 1 351934 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 85355 (syz-executor) thread 0xffff8000330094e0 (249197) exclusive rwlock vmmaplk r = 0 (0xfffffd8068b5f128) #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 uvmfault_lookup+0xe8 sys/uvm/uvm_fault.c:1918 #4 uvm_fault_check+0x895 uvmfault_amapcopy sys/uvm/uvm_fault.c:235 [inline] #4 uvm_fault_check+0x895 sys/uvm/uvm_fault.c:784 #5 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #7 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:603 #8 recall_trap+0x8 Process 56549 (syz-executor) thread 0xffff80003c4587f0 (362461) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839a9350) #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:746 #5 Xsyscall+0x128 Process 70741 (syz-executor) thread 0xffff800033008a80 (450201) exclusive rwlock vmmaplk r = 0 (0xfffffd8068b5f4f8) #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:281 #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:746 #7 Xsyscall+0x128 exclusive rwlock vmmaplk r = 0 (0xfffffd806b9a98b8) #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:281 #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:746 #7 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10197 11023K 11097K 166960K 11309 0 pcb 19 12K 12K 166960K 32 0 rtable 197 7K 8K 166960K 542 0 pf 34 17K 19K 166960K 55 0 ifaddr 40 6K 7K 166960K 52 0 ifgroup 55 2K 2K 166960K 68 0 sysctl 1 1K 9K 166960K 5 0 counters 68 36K 37K 166960K 80 0 ioctlops 0 0K 4K 166960K 1501 0 iov 1 12K 18K 166960K 38 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1402 88K 88K 166960K 1457 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 7 0K 0K 166960K 8 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 211 0 sigio 0 0K 0K 166960K 1 0 proc 72 115K 164K 166960K 555 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 7 0 in_multi 88 6K 7K 166960K 104 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 55 254K 254K 166960K 55 0 exec 0 0K 1K 166960K 374 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 251 168K 175K 166960K 3697 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 43 86K 104K 166960K 1293 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 5 0 NDP 12 0K 2K 166960K 32 0 temp 41 8639K 8719K 166960K 7074 0 kqueue 13 20K 26K 166960K 35 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 39 0 36 1 0 1 1 0 8 0 rtentry 176 229 0 143 5 0 5 5 0 8 0 unpcb 144 72 0 55 1 0 1 1 0 8 0 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 736 18 0 14 1 0 1 1 0 8 0 arp 136 75 0 66 1 0 1 1 0 8 0 inpcb 328 111 0 101 2 1 1 2 0 8 0 nd6 144 17 0 2 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 4 0 4 1 0 1 1 0 8 1 pppxif 1504 1 0 1 1 1 0 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 1 0 0 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 1 0 0 1 0 1 1 0 8 0 pfstitem 24 22 0 0 1 0 1 1 0 8 0 pfstkey 128 22 0 0 1 0 1 1 0 8 0 pfstate 384 22 0 0 3 0 3 3 0 8 0 pfrule 1344 22 0 17 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 612 0 210 37 1 36 36 0 8 8 art_table 40 614 0 210 6 0 6 6 0 8 0 art_node 32 229 0 152 2 0 2 2 0 8 0 sysvmsgpl 40 2 0 2 1 1 0 1 0 8 0 semapl 112 5 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1668 0 154 95 0 95 95 0 8 0 ffsino 296 1668 0 154 117 0 117 117 0 8 0 nchpl 144 1967 0 276 63 0 63 63 0 8 0 uvmvnodes 80 1840 0 0 38 0 38 38 0 8 0 vnodes 216 1840 0 0 103 0 103 103 0 8 0 namei 1024 6140 0 6140 1 0 1 1 0 8 1 percpumem 16 55 0 6 1 0 1 1 0 8 0 kstatmem 264 34 0 8 3 0 3 3 0 8 1 scxspl 216 7402 0 7402 10 2 8 8 1 8 8 plimitpl 152 35 0 16 1 0 1 1 0 8 0 sigapl 424 511 0 457 7 0 7 7 0 8 0 knotepl 120 307 0 0 10 0 10 10 0 8 0 kqueuepl 224 49 0 40 1 0 1 1 0 8 0 pipepl 344 116 0 88 3 0 3 3 0 8 0 fdescpl 528 489 0 457 3 0 3 3 0 8 0 filepl 160 1954 0 1731 12 0 12 12 0 8 2 lockfpl 104 30 0 28 1 0 1 1 0 8 0 lockfspl 48 14 0 12 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 32 0 15 1 0 1 1 0 8 0 ucredpl 104 118 0 104 1 0 1 1 0 8 0 zombiepl 144 468 0 467 1 0 1 1 0 8 0 processpl 1232 511 0 457 5 0 5 5 0 8 0 procpl 664 643 0 576 6 0 6 6 0 8 0 sockpl 752 225 0 195 5 1 4 5 0 8 0 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 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 107 0 0 14 0 14 14 0 8 0 mcl2k 2048 38 0 0 5 0 5 5 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 268 0 0 17 0 17 17 0 8 0 bufpl 280 3089 0 122 212 0 212 212 0 8 0 anonpl 32 5431 0 0 44 0 44 44 0 246 0 amapchunkpl 152 10788 0 10273 28 7 21 25 0 158 1 amappl16 200 2141 0 2101 6 3 3 5 0 8 0 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 113 0 101 1 0 1 1 0 8 0 amappl13 176 7 0 7 1 1 0 1 0 8 0 amappl12 168 1167 0 1136 3 1 2 2 0 8 0 amappl11 160 54 0 40 1 0 1 1 0 8 0 amappl10 152 7 0 7 1 1 0 1 0 8 0 amappl9 144 247 0 247 1 1 0 1 0 8 0 amappl8 136 27 0 25 1 0 1 1 0 8 0 amappl7 128 104 0 92 1 0 1 1 0 8 0 amappl6 120 182 0 179 1 0 1 1 0 8 0 amappl5 112 131 0 121 1 0 1 1 0 8 0 amappl4 104 306 0 286 1 0 1 1 0 8 0 amappl3 96 1664 0 1563 4 1 3 3 0 8 0 amappl2 88 711 0 635 2 0 2 2 0 8 0 amappl1 80 8376 0 7778 14 0 14 14 0 8 1 amappl 88 3017 0 2841 5 0 5 5 0 92 1 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 489 0 457 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 489 0 457 1 0 1 1 0 8 0 vmmpekpl 168 5615 0 5576 3 0 3 3 0 8 1 vmmpepl 168 37756 0 35771 90 2 88 89 0 357 0 vmsppl 488 488 0 457 6 1 5 5 0 8 0 rwobjpl 80 15136 0 12347 57 0 57 57 0 8 0 pdppl 4096 986 0 914 102 28 74 86 0 8 2 pvpl 32 11907 0 0 97 0 97 97 0 265 0 pmappl 256 488 0 457 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 287 0 32 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(ffffffff837e3ff0) 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: 0x6fa6d289a230, count: -3 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> trace sys_semop(ffff80003c4587f0,ffff80003c03fcd0,ffff80003c03fc20) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80003c03fcd0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c03fcd0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdbfa6b78680, count: -3