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(ffff8000fffe4038,ffff80003a4106f0,ffff80003a410640) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80003a4106f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a4106f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4837ab9e080, count: -3 ddb{1}> show registers rdi 0 rsi 0xb rbp 0xffff80003a410610 rbx 0xdeadbeefdeadbeef rdx 0 rcx 0xffff8000fffe4038 rax 0xffff8000299edff0 r8 0x7f7fffffc000 r9 0x1 r10 0xe604b3dc902fc234 r11 0xc37b8ff884673c20 r12 0xb r13 0xfffffd806b848e00 r14 0xffff80003a4106f0 r15 0xb rip 0xffffffff81de4112 sys_semop+0x352 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003a410520 ss 0x10 sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> show proc PROC (syz-executor) tid=8464 pid=73458 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=86, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800038ff1a10,0xffff8000fffe5cd0 process=0xffff8000fffe3048 user=0xffff80003a40b000, vmspace=0xfffffd806ef6c990 estcpu=36, cpticks=14, pctcpu=0.0, user=0, sys=14, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 17978 306544 33638 0 2 0 syz-executor 17978 161583 33638 0 3 0x4000080 fsleep syz-executor 17978 206890 33638 0 3 0x4000080 fsleep syz-executor 73458 447149 16041 0 7 0 syz-executor *73458 8464 16041 0 7 0x4000000 syz-executor 73458 125386 16041 0 3 0x4000080 fsleep syz-executor 27132 189829 15845 0 2 0 syz-executor 27132 426148 15845 0 3 0x4000080 fsleep syz-executor 27132 329500 15845 0 2 0x4000001 syz-executor 98980 149487 35277 0 2 0x1 syz-executor 98980 62994 35277 0 3 0x4000080 fsleep syz-executor 37661 181561 90094 0 2 0 syz-executor 37661 305792 90094 0 3 0x4000080 fifor syz-executor 37661 222374 90094 0 2 0x4000001 syz-executor 2447 333718 52826 0 2 0x1 syz-executor 2447 32904 52826 0 3 0x4000080 bell syz-executor 2447 255299 52826 0 3 0x4000080 fsleep syz-executor 99938 374884 7157 0 3 0x3000 suspend syz-executor 99938 246536 7157 0 3 0x4081000 getblk syz-executor 24011 38826 0 0 3 0x14280 nfsidl nfsio 37396 496588 0 0 3 0x14280 nfsidl nfsio 7384 412711 0 0 3 0x14280 nfsidl nfsio 8643 26005 0 0 3 0x14280 nfsidl nfsio 41902 515966 0 0 3 0x14280 nfsidl nfsio 28998 448203 0 0 3 0x14280 nfsidl nfsio 77749 340568 0 0 3 0x14280 nfsidl nfsio 40392 182833 0 0 3 0x14280 nfsidl nfsio 23910 71701 0 0 3 0x14280 nfsidl nfsio 1021 382999 0 0 3 0x14280 nfsidl nfsio 324 399546 0 0 3 0x14280 nfsidl nfsio 78349 51381 0 0 3 0x14280 nfsidl nfsio 56959 15904 0 0 3 0x14280 nfsidl nfsio 79366 320058 0 0 3 0x14280 nfsidl nfsio 22556 180510 0 0 3 0x14280 nfsidl nfsio 94219 500600 0 0 3 0x14280 nfsidl nfsio 24650 64919 0 0 3 0x14280 nfsidl nfsio 69066 336848 0 0 3 0x14280 nfsidl nfsio 77844 137458 0 0 3 0x14280 nfsidl nfsio 9705 505676 0 0 3 0x14280 nfsidl nfsio 7157 47603 357 0 3 0x82 wait syz-executor 72556 277877 0 0 3 0x14200 bored sosplice 33638 48441 357 0 3 0x82 nanoslp syz-executor 15845 118585 357 0 3 0x82 nanoslp syz-executor 90094 312353 357 0 3 0x82 nanoslp syz-executor 16041 360216 357 0 3 0x82 nanoslp syz-executor 52826 28829 357 0 3 0x82 nanoslp syz-executor 64266 214065 357 0 3 0x82 nanoslp syz-executor 35277 295354 357 0 3 0x82 nanoslp syz-executor 357 186819 35126 0 3 0x82 kqread syz-executor 35126 432110 69994 0 3 0x10008a sigsusp ksh 69994 161943 69166 0 3 0x98 kqread sshd-session 69166 451401 98963 0 3 0x92 kqread sshd-session 81624 304569 1 0 3 0x100083 ttyopn getty 98963 157668 1 0 3 0x88 kqread sshd 51613 94353 18447 74 3 0x1100092 bpf pflogd 18447 30158 1 0 3 0x80 sbwait pflogd 21891 61549 84705 73 3 0x1100090 kqread syslogd 84705 158569 1 0 3 0x100082 sbwait syslogd 35588 506942 1 0 3 0x100080 kqread resolvd 63459 449528 35205 77 3 0x100092 kqread dhcpleased 93878 46097 35205 77 3 0x100092 kqread dhcpleased 35205 28270 1 0 3 0x80 kqread dhcpleased 44209 92259 0 0 3 0x14200 bored smr 84090 10230 0 0 2 0x14200 zerothread 81035 501922 0 0 3 0x14200 aiodoned aiodoned 64471 492634 0 0 3 0x14200 syncer update 9200 408109 0 0 3 0x14200 cleaner cleaner 22445 522907 0 0 3 0x14200 reaper reaper 96631 17793 0 0 3 0x14200 pgdaemon pagedaemon 36244 257300 0 0 3 0x14200 bored viomb 40275 391681 0 0 3 0x40014200 acpi0 acpi0 23776 511439 0 0 3 0x40014200 idle1 79871 219274 0 0 3 0x14200 bored softnet1 96297 476746 0 0 3 0x14200 bored softnet0 38522 268308 0 0 3 0x14200 bored systqmp 58846 181738 0 0 3 0x14200 bored systq 11896 425092 0 0 3 0x14200 tmoslp softclockmp 41623 296613 0 0 3 0x40014200 tmoslp softclock 72501 105129 0 0 3 0x40014200 idle0 1 175974 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 17978 (syz-executor) thread 0xffff8000fffe5cc0 (306544) exclusive rwlock vmmaplk r = 0 (0xfffffd807adef118) #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 73458 (syz-executor) thread 0xffff8000fffe4038 (8464) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839660b0) #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 99938 (syz-executor) thread 0xffff8000fffe4800 (246536) exclusive rrwlock inode r = 0 (0xfffffd806797bec0) #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 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10235 11104K 11378K 166960K 12075 0 pcb 17 16K 18K 166960K 271 0 rtable 192 8K 8K 166960K 347 0 pf 33 17K 81K 166960K 90 0 ifaddr 39 6K 7K 166960K 68 0 ifgroup 51 2K 2K 166960K 96 0 sysctl 3 1K 9K 166960K 9 0 counters 66 36K 37K 166960K 240 0 ioctlops 0 0K 4K 166960K 1630 0 iov 0 0K 16K 166960K 24 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1341 84K 85K 166960K 1843 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 13K 166960K 13 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 17 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 639 0 sigio 0 0K 0K 166960K 7 0 proc 75 131K 163K 166960K 618 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 63 0 in_multi 88 6K 7K 166960K 141 0 ether_multi 1 0K 0K 166960K 6 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 265 1182K 1182K 166960K 265 0 exec 0 0K 1K 166960K 442 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 68 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 258 152K 163K 166960K 7337 0 UVM aobj 19 3K 3K 166960K 19 0 pinsyscall 43 86K 106K 166960K 1780 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 35 0 NDP 11 0K 2K 166960K 45 0 temp 54 8646K 8712K 166960K 23539 0 kqueue 13 20K 30K 166960K 116 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 66 0 62 1 0 1 1 0 8 0 rtentry 176 116 0 38 5 0 5 5 0 8 0 unpcb 144 784 0 763 6 5 1 6 0 8 0 syncache 336 7 0 7 1 1 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 201 0 196 7 6 1 7 0 8 0 arp 136 14 0 3 1 0 1 1 0 8 0 inpcb 328 796 0 787 10 8 2 10 0 8 0 nd6 144 20 0 4 1 0 1 1 0 8 0 pkpcb 40 6 0 6 1 1 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 82 0 82 1 1 0 1 0 8 0 pffrag 232 3 0 0 1 0 1 1 0 482 0 pffrnode 88 3 0 0 1 0 1 1 0 8 0 pffrent 40 36 0 33 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 1 1 1 0 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfstitem 24 37 0 9 1 0 1 1 0 8 0 pfstkey 128 37 0 9 2 0 2 2 0 8 0 pfstate 384 36 0 9 4 0 4 4 0 8 0 pfrule 1344 25 0 19 2 0 2 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 550 0 176 30 5 25 28 0 8 1 art_table 40 552 0 176 5 0 5 5 0 8 0 art_node 32 115 0 47 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 6 2 1 1 1 0 8 1 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 14 0 5 1 0 1 1 0 8 0 shmpl 112 16 0 0 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2553 0 1045 95 0 95 95 0 8 0 ffsino 296 2553 0 1045 117 0 117 117 0 8 0 nchpl 144 3415 0 1716 64 0 64 64 0 8 0 rtmask 32 3 0 3 1 1 0 1 0 8 0 uvmvnodes 80 2869 0 0 59 0 59 59 0 8 0 vnodes 216 2869 0 0 160 0 160 160 0 8 0 namei 1024 11722 0 11722 2 1 1 2 0 8 1 percpumem 16 135 0 87 1 0 1 1 0 8 0 kstatmem 264 56 0 32 2 0 2 2 0 8 0 scsiplug 72 2 0 2 2 2 0 1 0 8 0 scxspl 216 15610 0 15598 10 9 1 8 1 8 0 plimitpl 152 259 0 241 1 0 1 1 0 8 0 sigapl 424 954 0 885 9 1 8 8 0 8 0 knotepl 120 538 0 0 17 0 17 17 0 8 0 kqueuepl 224 258 0 249 5 4 1 5 0 8 0 pipepl 344 210 0 183 9 6 3 6 0 8 0 fdescpl 528 917 0 885 3 0 3 3 0 8 0 filepl 160 5747 0 5519 23 13 10 20 0 8 0 lockfpl 104 182 0 180 1 0 1 1 0 8 0 lockfspl 48 79 0 77 1 0 1 1 0 8 0 sessionpl 144 27 0 18 1 0 1 1 0 8 0 pgrppl 48 103 0 86 1 0 1 1 0 8 0 ucredpl 104 1099 0 1086 1 0 1 1 0 8 0 zombiepl 144 890 0 888 1 0 1 1 0 8 0 processpl 1232 954 0 885 6 0 6 6 0 8 0 procpl 664 1793 0 1712 8 0 8 8 0 8 0 sosppl 168 5 0 5 1 1 0 1 0 8 0 sockpl 752 1664 0 1630 19 15 4 17 0 8 0 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 116 0 0 15 0 15 15 0 8 0 mcl2k 2048 39 0 0 5 0 5 5 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 167 0 0 11 0 11 11 0 8 0 bufpl 280 6571 0 428 439 0 439 439 0 8 0 anonpl 32 11818 0 0 96 0 96 96 0 246 0 amapchunkpl 152 24673 0 24036 36 11 25 35 0 158 0 amappl16 200 3772 0 3687 24 18 6 23 0 8 0 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 128 0 114 1 0 1 1 0 8 0 amappl13 176 4 0 4 1 1 0 1 0 8 0 amappl12 168 1595 0 1563 4 2 2 3 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 144 279 0 279 1 1 0 1 0 8 0 amappl8 136 26 0 23 1 0 1 1 0 8 0 amappl7 128 113 0 101 1 0 1 1 0 8 0 amappl6 120 227 0 224 1 0 1 1 0 8 0 amappl5 112 127 0 118 1 0 1 1 0 8 0 amappl4 104 319 0 298 1 0 1 1 0 8 0 amappl3 96 4188 0 4082 3 0 3 3 0 8 0 amappl2 88 1179 0 1100 2 0 2 2 0 8 0 amappl1 80 11505 0 10890 15 1 14 15 0 8 0 amappl 88 6529 0 6344 5 0 5 5 0 92 0 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 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 18 0 0 1 0 1 1 0 8 0 uaddrrnd 24 917 0 885 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 917 0 885 1 0 1 1 0 8 0 vmmpekpl 168 9171 0 9124 3 0 3 3 0 8 0 vmmpepl 168 65572 0 63452 109 11 98 109 0 357 0 vmsppl 488 916 0 885 5 1 4 5 0 8 0 rwobjpl 80 23382 0 19478 81 0 81 81 0 8 0 pdppl 4096 1842 0 1770 122 50 72 88 0 8 0 pvpl 32 18677 0 0 151 0 151 151 0 265 0 pmappl 256 916 0 885 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 302 0 65 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(ffffffff837c9ff0) 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(ffffffff83965ea8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83965ea8) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80003c482cd0,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff83965ea8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83965ea8) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x709bbeb4a760, count: -10 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> trace sys_semop(ffff8000fffe4038,ffff80003a4106f0,ffff80003a410640) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80003a4106f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a4106f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4837ab9e080, count: -3