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(ffff80003c4cb4f8,ffff80003c433500,ffff80003c433450) at sys_semop+0x352 sys/kern/sysv_sem.c:624 syscall(ffff80003c433500) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c433500) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8a2317b1880, count: -3 ddb{1}> show registers rdi 0 rsi 0x6966 __ALIGN_SIZE+0x5966 rbp 0xffff80003c433420 rbx 0xdead4110deaf7738 rdx 0 rcx 0xffff80003c4cb4f8 rax 0xffff8000299ddff0 r8 0x7f7fffffc000 r9 0x1 r10 0x6da7c6690c4cf84c r11 0xc0f2c1e09af55a06 r12 0x6966 __ALIGN_SIZE+0x5966 r13 0xfffffd806993a7e0 r14 0xffff80003c433500 r15 0x6966 __ALIGN_SIZE+0x5966 rip 0xffffffff81606062 sys_semop+0x352 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c433330 ss 0x10 sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> show proc PROC (syz-executor) tid=255554 pid=91845 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=81, usrpri=81, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c4cba28,0xffff80003c4cb270 process=0xffff8000fffdc4f8 user=0xffff80003c42e000, vmspace=0xfffffd806c929208 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 36611 399114 7992 0 7 0 syz-executor 36611 396713 7992 0 3 0x4000080 fsleep syz-executor 41080 103858 75806 0 3 0x80 fsleep syz-executor 41080 249241 75806 0 2 0x4000000 syz-executor 91845 486497 76632 0 2 0 syz-executor *91845 255554 76632 0 7 0x4000000 syz-executor 91845 368190 76632 0 3 0x4000080 fsleep syz-executor 2321 204314 71905 0 2 0 syz-executor 2321 487593 71905 0 3 0x4000080 fsleep syz-executor 49589 449323 90904 0 3 0x80 fsleep syz-executor 49589 188359 90904 0 3 0x4000080 piperd syz-executor 83371 162129 10314 0 3 0x80 fsleep syz-executor 83371 465654 10314 0 3 0x4000080 bell syz-executor 28704 47599 49667 0 3 0x82 wait syz-executor 71905 516031 49667 0 3 0x82 nanoslp syz-executor 20927 195779 49667 0 3 0x82 nanoslp syz-executor 51183 210133 19252 0 3 0x82 sbwait sshd-session 7992 280848 49667 0 3 0x82 nanoslp syz-executor 10314 220750 49667 0 3 0x82 nanoslp syz-executor 76632 123879 49667 0 2 0x3 syz-executor 90904 39948 49667 0 3 0x82 nanoslp syz-executor 75806 75605 49667 0 3 0x82 nanoslp syz-executor 49667 58929 78166 0 2 0x2 syz-executor 78166 442727 3688 0 3 0x10008a sigsusp ksh 3688 503231 23923 0 3 0x98 kqread sshd-session 23923 503592 19252 0 3 0x92 kqread sshd-session 29883 17593 1 0 3 0x100083 ttyin getty 19252 301176 1 0 3 0x88 kqread sshd 66406 247867 45830 74 3 0x1100092 bpf pflogd 45830 387960 1 0 3 0x80 sbwait pflogd 92883 494205 99664 73 3 0x1100090 kqread syslogd 99664 73186 1 0 3 0x100082 sbwait syslogd 41354 162590 1 0 3 0x100080 kqread resolvd 51811 155192 95635 77 3 0x100092 kqread dhcpleased 63938 211053 95635 77 3 0x100092 kqread dhcpleased 95635 96961 1 0 3 0x80 kqread dhcpleased 16865 121607 0 0 3 0x14200 bored smr 50296 20527 0 0 2 0x14200 zerothread 73737 347609 0 0 3 0x14200 aiodoned aiodoned 6529 64824 0 0 3 0x14200 syncer update 85874 293119 0 0 3 0x14200 cleaner cleaner 31843 34351 0 0 3 0x14200 reaper reaper 77436 319509 0 0 3 0x14200 pgdaemon pagedaemon 68492 5235 0 0 3 0x14200 bored viomb 14687 484258 0 0 3 0x40014200 acpi0 acpi0 12218 361114 0 0 3 0x40014200 idle1 59328 402074 0 0 3 0x14200 bored softnet1 2716 385938 0 0 3 0x14200 bored softnet0 50235 338531 0 0 3 0x14200 bored systqmp 19443 269531 0 0 3 0x14200 bored systq 14228 222242 0 0 3 0x14200 tmoslp softclockmp 86465 379998 0 0 3 0x40014200 tmoslp softclock 11440 514385 0 0 3 0x40014200 idle0 1 191385 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 36611 (syz-executor) thread 0xffff8000fffe8020 (399114) exclusive rwlock uobjlk r = 0 (0xfffffd806bfd8070) #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 uvm_fault+0x1e5 sys/uvm/uvm_fault.c:649 #3 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #4 usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806c9294f0) #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_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 #7 recall_trap+0x8 Process 91845 (syz-executor) thread 0xffff80003c4cba28 (486497) exclusive rwlock vmmaplk r = 0 (0xfffffd806c929308) #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:5165 #3 uvm_map_protect+0xe0 sys/uvm/uvm_map.c:3069 #4 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #6 Xsyscall+0x128 Process 91845 (syz-executor) thread 0xffff80003c4cb4f8 (255554) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838d62c0) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11070 12154K 13961K 166960K 13796 0 pcb 17 16K 18K 166960K 440 0 rtable 174 7K 9K 166960K 658 0 pf 33 17K 82K 166960K 173 0 ifaddr 30 5K 7K 166960K 116 0 ifgroup 43 2K 2K 166960K 214 0 sysctl 4 1K 9K 166960K 20 0 counters 64 36K 38K 166960K 320 0 ioctlops 0 0K 4K 166960K 1870 0 iov 0 0K 28K 166960K 118 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1489 94K 94K 166960K 2768 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 8 0 VM map 2 1K 1K 166960K 2 0 sem 15 0K 0K 166960K 51 0 dirhash 12 2K 3K 166960K 69 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 1608 0 sigio 0 0K 0K 166960K 22 0 proc 76 115K 180K 166960K 782 0 subproc 72 4K 4K 166960K 114 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 237 0 in_multi 63 4K 7K 166960K 251 0 ether_multi 1 0K 0K 166960K 23 0 mrt 0 0K 0K 166960K 7 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 576 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 261 180K 190K 166960K 15583 0 UVM aobj 16 6K 8K 166960K 22 0 pinsyscall 45 90K 102K 166960K 2861 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 121 0 NDP 9 0K 2K 166960K 83 0 temp 62 8684K 8752K 166960K 74438 0 kqueue 13 20K 30K 166960K 222 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 120 186 0 183 1 0 1 1 0 8 0 rtentry 176 205 0 137 6 0 6 6 0 8 0 unpcb 144 963 0 944 6 4 2 6 0 8 1 syncache 336 14 0 14 4 4 0 1 0 8 0 tcpqe 32 4 0 4 2 2 0 1 0 8 0 tcpcb 736 514 0 502 7 5 2 7 0 8 0 arp 136 35 0 23 1 0 1 1 0 8 0 inpcb 328 1854 0 1837 19 11 8 8 0 8 6 nd6 152 44 0 29 2 0 2 2 0 8 0 pkpcb 40 14 0 14 4 3 1 1 0 8 1 kcovpl 48 12 0 4 1 0 1 1 0 8 0 ppxss 1192 100 0 100 3 2 1 1 0 8 1 pppxif 1504 5 0 5 4 4 0 1 0 8 0 pfstscr 40 3 0 2 2 1 1 1 0 8 0 pffrag 232 10 0 4 1 0 1 1 0 482 0 pffrnode 88 9 0 3 1 0 1 1 0 8 0 pffrent 40 19 0 13 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 4 0 0 1 0 1 1 0 8 0 pfstkey 128 7 0 4 1 0 1 1 0 8 0 pfstate 448 4 0 2 1 0 1 1 0 8 0 pfrule 1360 2 0 2 2 2 0 1 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 256 853 0 560 32 6 26 32 0 8 2 art_table 40 855 0 560 6 0 6 6 0 8 0 art_node 32 200 0 142 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 6 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 42 0 30 1 0 1 1 0 8 0 shmpl 112 14 0 3 1 0 1 1 0 8 0 dirhash 1024 55 0 38 3 0 3 3 0 8 0 dino2pl 256 4544 0 3025 96 0 96 96 0 8 0 ffsino 296 4544 0 3025 118 0 118 118 0 8 0 nchpl 144 6515 0 4803 64 0 64 64 0 8 0 rtmask 32 8 0 8 3 2 1 1 0 8 1 vnodes 216 5257 0 0 293 0 293 293 0 8 0 namei 1024 21062 0 21062 3 2 1 2 0 8 1 percpumem 16 175 0 128 1 0 1 1 0 8 0 vcpupl 3968 2 0 0 1 0 1 1 0 8 0 vmpool 848 5 0 3 1 0 1 1 0 8 0 kstatmem 264 116 0 96 3 1 2 3 0 8 0 scsiplug 72 3 0 3 2 1 1 1 0 8 1 scxspl 216 37905 0 37905 12 11 1 8 1 8 1 plimitpl 152 462 0 445 1 0 1 1 0 8 0 sigapl 424 1920 0 1871 9 2 7 8 0 8 0 knotepl 120 532 0 0 17 0 17 17 0 8 0 kqueuepl 224 573 0 564 9 8 1 5 0 8 0 pipepl 344 225 0 197 3 0 3 3 0 8 0 fdescpl 528 1881 0 1848 3 0 3 3 0 8 0 filepl 160 11178 0 10918 26 13 13 18 0 8 2 lockfpl 104 631 0 629 2 1 1 2 0 8 0 lockfspl 48 217 0 215 1 0 1 1 0 8 0 sessionpl 144 35 0 25 1 0 1 1 0 8 0 pgrppl 48 59 0 41 1 0 1 1 0 8 0 ucredpl 104 1756 0 1741 1 0 1 1 0 8 0 zombiepl 144 1984 0 1982 2 1 1 1 0 8 0 processpl 1232 1920 0 1871 6 0 6 6 0 8 0 procpl 664 3949 0 3893 8 2 6 8 0 8 0 sosppl 176 11 0 11 3 3 0 1 0 8 0 sockpl 752 3124 0 3085 27 16 11 17 0 8 5 mcl64k 65536 11 0 0 2 0 2 2 0 8 0 mcl16k 16384 11 0 0 2 0 2 2 0 8 0 mcl12k 12288 6 0 0 1 0 1 1 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 8 0 0 1 0 1 1 0 8 0 mcl4k 4096 112 0 0 14 0 14 14 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 38 0 0 5 0 5 5 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 310 0 0 20 0 20 20 0 8 0 bufpl 280 14328 0 8192 439 0 439 439 0 8 0 anonpl 32 7748 0 0 63 0 63 63 0 246 0 amapchunkpl 152 55947 0 55436 37 11 26 29 0 158 5 amappl16 200 5759 0 5728 45 32 13 15 0 8 8 amappl15 192 107 0 107 2 2 0 1 0 8 0 amappl14 184 10 0 10 1 1 0 1 0 8 0 amappl13 176 474 0 473 1 0 1 1 0 8 0 amappl12 168 2291 0 2246 3 0 3 3 0 8 0 amappl11 160 22 0 22 1 1 0 1 0 8 0 amappl10 152 51 0 37 1 0 1 1 0 8 0 amappl9 144 251 0 251 1 1 0 1 0 8 0 amappl8 136 43 0 39 1 0 1 1 0 8 0 amappl7 128 99 0 97 1 0 1 1 0 8 0 amappl6 120 334 0 319 1 0 1 1 0 8 0 amappl5 112 88 0 76 1 0 1 1 0 8 0 amappl4 104 479 0 449 1 0 1 1 0 8 0 amappl3 96 9247 0 9151 4 1 3 3 0 8 0 amappl2 88 2047 0 1962 3 0 3 3 0 8 0 amappl1 80 18291 0 17598 16 0 16 16 0 8 0 amappl 88 14517 0 14342 5 0 5 5 0 92 0 uvmvnodes 80 185 0 0 4 0 4 4 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 8 0 8 3 3 0 1 0 8 0 dma128 128 255 0 255 3 3 0 1 0 8 0 dma64 64 9 0 9 2 2 0 1 0 8 0 dma32 32 9 0 9 3 3 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 21 0 6 1 0 1 1 0 8 0 uaddrrnd 24 1881 0 1848 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1881 0 1848 1 0 1 1 0 8 0 vmmpekpl 168 15333 0 15288 3 0 3 3 0 8 0 vmmpepl 168 124904 0 122785 114 11 103 103 0 357 7 vmsppl 488 1880 0 1848 5 0 5 5 0 8 0 rwobjpl 80 34205 0 32964 33 2 31 31 0 8 1 pdppl 4096 3779 0 3704 116 41 75 83 0 8 0 pvpl 32 17270 0 0 139 0 139 139 0 265 0 pmappl 256 1885 0 1851 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 318 0 64 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(ffffffff83818ff0) 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(ffffffff838d5ac0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff838d5ac0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 uvm_fault(fffffd806c9293f0,6287d863000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:650 upageflttrap(ffff8000327d81b0,6287d863000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff8000327d81b0) at usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x772ab6326df0, count: -8 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> trace sys_semop(ffff80003c4cb4f8,ffff80003c433500,ffff80003c433450) at sys_semop+0x352 sys/kern/sysv_sem.c:624 syscall(ffff80003c433500) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c433500) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8a2317b1880, count: -3