kernel: protection fault trap, code=0 Stopped at sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace sys_semop(ffff800037c082b8,ffff80002a315610,ffff80002a315560) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80002a315610) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a315610) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71c2a6ed790, count: -3 ddb{0}> show registers rdi 0 rsi 0xb rbp 0xffff80002a315530 rbx 0xdeaf4152deaf4152 rdx 0 rcx 0xffff800037c082b8 rax 0xffffffff8376eff0 cpu_info_full_primary+0x1ff0 r8 0x7f7fffffc000 r9 0 r10 0x1e4fb84f3925429 r11 0xcdddae2e40bb11fb r12 0xb r13 0xfffffd80695fbd20 r14 0xffff80002a315610 r15 0xb rip 0xffffffff82e83e12 sys_semop+0x352 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a315440 ss 0x10 sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{0}> show proc PROC (syz-executor) tid=495581 pid=86063 tcnt=4 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=0xffff80003c4a94f0,0xffff800037c087f8 process=0xffff80003b025360 user=0xffff80002a310000, vmspace=0xfffffd800b0271e8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 5340 26421 47257 0 2 0 syz-executor 71087 473508 44728 0 7 0 syz-executor 71087 403208 44728 0 2 0x4000000 syz-executor 44622 407032 87639 0 2 0 syz-executor 44622 128865 87639 0 2 0x4000000 syz-executor 64838 104609 50983 0 2 0 syz-executor 64838 104187 50983 0 3 0x4000080 fsleep syz-executor 97730 460102 53252 0 2 0 syz-executor 97730 241294 53252 0 3 0x4000080 fsleep syz-executor 86063 75375 42923 0 2 0 syz-executor *86063 495581 42923 0 7 0x4000000 syz-executor 86063 337714 42923 0 3 0x4000080 fsleep syz-executor 86063 119559 42923 0 3 0x4000080 fsleep syz-executor 84669 115578 44759 0 2 0 syz-executor 84669 182470 44759 0 3 0x4000080 fsleep syz-executor 78314 323154 0 0 3 0x14200 acct acct 42923 395617 90886 0 3 0x82 nanoslp syz-executor 87639 124801 90886 0 3 0x82 nanoslp syz-executor 44759 377144 90886 0 3 0x82 nanoslp syz-executor 56607 397588 1 0 3 0x100083 ttyin getty 55083 450908 0 0 3 0x14200 bored sosplice 50983 277646 90886 0 3 0x82 nanoslp syz-executor 44728 116942 90886 0 2 0x3 syz-executor 47257 264551 90886 0 2 0x3 syz-executor 53252 209643 90886 0 2 0x3 syz-executor 24011 17695 90886 0 3 0x82 wait syz-executor 90886 389391 6963 0 3 0x82 kqread syz-executor 6963 442816 79620 0 3 0x10008a sigsusp ksh 79620 16133 37074 0 3 0x98 kqread sshd-session 37074 170105 56253 0 3 0x92 kqread sshd-session 56253 60308 1 0 3 0x88 kqread sshd 56310 391562 49119 74 3 0x1100092 bpf pflogd 49119 264365 1 0 3 0x80 sbwait pflogd 73973 239588 64365 73 3 0x1100090 kqread syslogd 64365 361191 1 0 3 0x100082 sbwait syslogd 34281 417719 1 0 3 0x100080 kqread resolvd 68745 198713 54443 77 3 0x100092 kqread dhcpleased 24729 117645 54443 77 3 0x100092 kqread dhcpleased 54443 216790 1 0 3 0x80 kqread dhcpleased 93862 378013 0 0 3 0x14200 bored smr 99768 380637 0 0 2 0x14200 zerothread 9920 371329 0 0 3 0x14200 aiodoned aiodoned 38630 52354 0 0 3 0x14200 syncer update 66108 237977 0 0 3 0x14200 cleaner cleaner 83575 306684 0 0 3 0x14200 reaper reaper 42025 489760 0 0 3 0x14200 pgdaemon pagedaemon 54140 20104 0 0 3 0x14200 bored viomb 93419 344183 0 0 3 0x40014200 acpi0 acpi0 35049 37812 0 0 3 0x40014200 idle1 27803 135821 0 0 3 0x14200 bored softnet7 88663 467550 0 0 3 0x14200 bored softnet6 97232 273056 0 0 3 0x14200 bored softnet5 77978 38826 0 0 3 0x14200 bored softnet4 32603 48075 0 0 3 0x14200 bored softnet3 24719 130277 0 0 3 0x14200 bored softnet2 42969 256804 0 0 3 0x14200 bored softnet1 86839 330499 0 0 3 0x14200 bored softnet0 93245 489119 0 0 3 0x14200 smrbar systqmp 56559 377015 0 0 3 0x14200 bored systq 72997 304066 0 0 3 0x14200 tmoslp softclockmp 47808 122733 0 0 3 0x40014200 tmoslp softclock 47483 326449 0 0 3 0x40014200 idle0 1 494548 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 5340 (syz-executor) thread 0xffff800037c08d18 (26421) exclusive rwlock vmmaplk r = 0 (0xfffffd806b6df310) #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 71087 (syz-executor) thread 0xffff800037c09a10 (403208) exclusive rwlock vmmaplk r = 0 (0xfffffd806b6dfc98) #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 44622 (syz-executor) thread 0xffff800037c08fb0 (128865) exclusive rwlock fdlock r = 0 (0xffff80003b0228b0) #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 ptmioctl+0x13c sys/kern/tty_pty.c:1093 #3 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #4 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 #5 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 #7 Xsyscall+0x128 Process 86063 (syz-executor) thread 0xffff800037c082b8 (495581) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83943eb0) #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 93245 (systqmp) thread 0xffff8000ffffea60 (489119) shared rwlock systqmp r = 0 (0xffffffff83849bb8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10215 11036K 12416K 166960K 12630 0 pcb 17 15K 17K 166960K 328 0 rtable 159 9K 9K 166960K 543 0 pf 34 17K 21K 166960K 144 0 ifaddr 34 5K 8K 166960K 109 0 ifgroup 55 2K 2K 166960K 182 0 sysctl 4 1K 9K 166960K 13 0 counters 68 36K 38K 166960K 178 0 ioctlops 0 0K 4K 166960K 1712 0 iov 0 0K 20K 166960K 58 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1491 94K 94K 166960K 2348 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 12 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 126 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 89K 166960K 1039 0 sigio 0 0K 0K 166960K 21 0 proc 72 115K 164K 166960K 720 0 subproc 72 4K 4K 166960K 100 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 122 0 in_multi 57 4K 7K 166960K 170 0 ether_multi 1 0K 0K 166960K 6 0 mrt 1 0K 0K 166960K 7 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 103 466K 466K 166960K 103 0 exec 0 0K 1K 166960K 650 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 4 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 251 162K 176K 166960K 11504 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 43 86K 100K 166960K 2214 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 71 0 NDP 12 0K 1K 166960K 69 0 temp 79 8656K 8906K 166960K 37390 0 kqueue 13 20K 31K 166960K 224 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 120 125 0 122 2 0 2 2 0 8 1 rtentry 176 164 0 107 5 0 5 5 0 8 0 unpcb 144 525 0 504 4 2 2 2 0 8 1 syncache 336 8 0 8 4 4 0 1 0 8 0 tcpcb 736 380 0 376 8 7 1 7 0 8 0 arp 136 20 0 10 1 0 1 1 0 8 0 inpcb 328 1370 0 1360 29 22 7 15 0 8 5 nd6 144 28 0 18 1 0 1 1 0 8 0 pkpcb 40 13 0 13 1 0 1 1 0 8 1 kcovpl 48 11 0 3 1 0 1 1 0 8 0 ppxss 1192 34 0 34 1 0 1 1 0 8 1 pppxif 1504 10 0 10 3 2 1 1 0 8 1 pffrag 232 9 0 3 2 1 1 1 0 482 0 pffrnode 88 8 0 3 2 1 1 1 0 8 0 pffrent 40 12 0 6 2 1 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 8 0 8 2 2 0 1 0 8 0 pfanchor 1288 1 0 1 1 1 0 1 0 8 0 pfstitem 24 90 0 34 1 0 1 1 0 8 0 pfstkey 128 90 0 34 2 0 2 2 0 8 0 pfstate 384 90 0 34 6 0 6 6 0 8 0 pfrule 1344 22 0 17 2 1 1 2 0 8 0 rttmr 136 2 0 2 2 1 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 776 0 519 30 8 22 30 0 8 1 art_table 40 778 0 519 5 0 5 5 0 8 0 art_node 32 163 0 112 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 2 2 1 1 1 0 8 0 semupl 112 3 0 3 2 1 1 1 0 8 1 semapl 112 121 0 112 1 0 1 1 0 8 0 dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 3401 0 1897 95 0 95 95 0 8 0 ffsino 296 3401 0 1897 117 0 117 117 0 8 0 nchpl 144 4770 0 3069 64 0 64 64 0 8 0 rtmask 32 6 0 6 2 1 1 1 0 8 1 uvmvnodes 80 4014 0 0 82 0 82 82 0 8 0 vnodes 216 4014 0 0 223 0 223 223 0 8 0 namei 1024 17083 0 17083 2 1 1 2 0 8 1 percpumem 16 104 0 55 1 0 1 1 0 8 0 pfiaddrpl 120 2 0 2 1 1 0 1 0 8 0 kstatmem 264 98 0 70 4 1 3 3 0 8 0 scsiplug 72 5 0 5 2 1 1 1 0 8 1 scxspl 216 22733 0 22733 9 8 1 7 1 8 1 plimitpl 152 228 0 210 1 0 1 1 0 8 0 sigapl 424 1343 0 1287 7 0 7 7 0 8 0 knotepl 120 521 0 0 16 0 16 16 0 8 0 kqueuepl 224 388 0 379 3 2 1 3 0 8 0 pipepl 344 249 0 222 9 6 3 9 0 8 0 fdescpl 528 1317 0 1285 3 0 3 3 0 8 0 filepl 160 8936 0 8710 35 18 17 25 0 8 4 lockfpl 104 411 0 408 2 1 1 2 0 8 0 lockfspl 48 176 0 173 1 0 1 1 0 8 0 sessionpl 144 29 0 20 1 0 1 1 0 8 0 pgrppl 48 54 0 37 1 0 1 1 0 8 0 ucredpl 104 1380 0 1367 1 0 1 1 0 8 0 zombiepl 144 1834 0 1833 1 0 1 1 0 8 0 processpl 1232 1343 0 1287 5 0 5 5 0 8 0 procpl 664 2943 0 2879 7 0 7 7 0 8 0 sosppl 168 12 0 12 2 1 1 1 0 8 1 sockpl 752 2061 0 2027 40 26 14 20 0 8 9 mcl64k 65536 19 0 0 3 0 3 3 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 8 0 0 1 0 1 1 0 8 0 mcl4k 4096 122 0 0 16 0 16 16 0 8 0 mcl2k 2048 26 0 0 4 0 4 4 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 1183 0 0 74 0 74 74 0 8 0 bufpl 280 8720 0 2577 440 0 440 440 0 8 0 anonpl 32 11260 0 0 91 0 91 91 0 246 0 amapchunkpl 152 37883 0 37188 38 3 35 35 0 158 5 amappl16 200 3973 0 3918 27 10 17 18 0 8 8 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 122 0 109 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 2012 0 1980 4 2 2 3 0 8 0 amappl11 160 62 0 47 1 0 1 1 0 8 0 amappl10 152 26 0 26 1 1 0 1 0 8 0 amappl9 144 355 0 355 1 1 0 1 0 8 0 amappl8 136 20 0 17 1 0 1 1 0 8 0 amappl7 128 113 0 101 1 0 1 1 0 8 0 amappl6 120 208 0 204 1 0 1 1 0 8 0 amappl5 112 134 0 124 1 0 1 1 0 8 0 amappl4 104 314 0 292 1 0 1 1 0 8 0 amappl3 96 6550 0 6452 4 1 3 3 0 8 0 amappl2 88 1579 0 1499 2 0 2 2 0 8 0 amappl1 80 12644 0 12034 17 3 14 15 0 8 0 amappl 88 10587 0 10411 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 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 6 0 6 1 1 0 1 0 8 0 dma128 128 254 0 254 2 1 1 1 0 8 1 dma64 64 8 0 8 3 3 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 1317 0 1285 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1317 0 1285 1 0 1 1 0 8 0 vmmpekpl 168 12224 0 12175 3 0 3 3 0 8 0 vmmpepl 168 88120 0 86024 110 5 105 107 0 357 5 vmsppl 488 1316 0 1285 6 1 5 5 0 8 0 rwobjpl 80 29115 0 24129 102 0 102 102 0 8 0 pdppl 4096 2642 0 2570 106 34 72 86 0 8 0 pvpl 32 21819 0 0 176 0 176 176 0 265 0 pmappl 256 1316 0 1285 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 356 0 57 9 0 9 9 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff800037c082b8,ffff80002a315610,ffff80002a315560) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80002a315610) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a315610) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71c2a6ed790, count: -3 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299edff0) 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: 0x759b62eca170, count: -3