kernel: protection fault trap, code=0 Stopped at sys_semop+0x3d5: 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(ffff80002a2e4a80,ffff80003c470ff0,ffff80003c470f40) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003c470ff0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c470ff0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe48493e06d0, count: -3 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c470f10 rbx 0xdeaf4152deaf4152 rdx 0 rcx 0xffff80002a2e4a80 rax 0xdeaf4152deaf4152 r8 0x7f7fffffc000 r9 0xfffffd80097fb208 r10 0xf25618393ae4ea50 r11 0x54674b7fee3cb2e1 r12 0 r13 0xfffffd806b573540 r14 0xffff80003c470ff0 r15 0 rip 0xffffffff821438c5 sys_semop+0x3d5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c470e20 ss 0x10 sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{1}> show proc PROC (syz-executor) tid=187996 pid=29502 tcnt=4 stat=onproc flags process=10 proc=4000000 runpri=36, usrpri=50, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2e4fb0,0xffff80002a2e54f0 process=0xffff80003500cea0 user=0xffff80003c46c000, vmspace=0xfffffd806baca030 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 53596 494220 97653 32767 2 0x10 syz-executor 67025 166098 42515 32767 2 0x10 syz-executor 67025 497338 42515 32767 2 0x4000010 syz-executor 11881 206621 12719 32767 2 0x10 syz-executor 11881 200335 12719 32767 2 0x4000010 syz-executor 29502 514477 78049 32767 7 0x10 syz-executor *29502 187996 78049 32767 7 0x4000010 syz-executor 29502 270279 78049 32767 2 0x4000010 syz-executor 29502 204687 78049 32767 3 0x4000090 fsleep syz-executor 98559 376902 51720 32767 3 0x90 nanoslp syz-executor 98559 137064 51720 32767 3 0x4000090 kqread syz-executor 58516 486737 47100 32767 3 0x90 nanoslp syz-executor 58516 252833 47100 32767 3 0x4000090 netcon syz-executor 58516 169856 47100 32767 3 0x4000090 fsleep syz-executor 85226 8198 86456 32767 3 0x90 nanoslp syz-executor 85226 302263 86456 32767 3 0x4000090 lockf syz-executor 85226 323182 86456 32767 3 0x4000090 ttyin syz-executor 85226 329037 86456 32767 3 0x4000090 pipewr syz-executor 85226 80470 86456 32767 3 0x4000090 fsleep syz-executor 82774 319171 12289 0 3 0x82 sbwait sshd-session 99308 418720 0 0 3 0x14200 bored sosplice 97653 11169 59270 32767 3 0x90 nanoslp syz-executor 42515 66827 58698 32767 3 0x90 nanoslp syz-executor 47100 57074 85671 32767 3 0x90 nanoslp syz-executor 27311 497556 88804 32767 3 0x90 nanoslp syz-executor 51720 106713 34369 32767 3 0x90 nanoslp syz-executor 86456 214336 6823 32767 3 0x90 nanoslp syz-executor 78049 228133 33286 32767 3 0x90 nanoslp syz-executor 12719 70129 51317 32767 3 0x90 nanoslp syz-executor 59270 18530 69458 0 3 0x82 wait syz-executor 58698 455326 69458 0 3 0x82 wait syz-executor 88804 98911 69458 0 3 0x82 wait syz-executor 85671 196085 69458 0 3 0x82 wait syz-executor 6823 50208 69458 0 3 0x82 wait syz-executor 33286 283027 69458 0 3 0x82 wait syz-executor 51317 56691 69458 0 3 0x82 wait syz-executor 34369 158131 69458 0 3 0x82 wait syz-executor 69458 208398 57244 0 3 0x82 kqread syz-executor 57244 441632 47125 0 3 0x10008a sigsusp ksh 47125 439349 61438 0 3 0x98 kqread sshd-session 61438 426970 12289 0 3 0x92 kqread sshd-session 20491 321142 1 0 3 0x100083 ttyin getty 12289 194866 1 0 3 0x88 kqread sshd 96617 164180 93633 73 3 0x1100090 kqread syslogd 93633 335420 1 0 3 0x100082 sbwait syslogd 33549 134660 1 0 3 0x100080 kqread resolvd 15137 254900 15324 77 3 0x100092 kqread dhcpleased 62932 6820 15324 77 3 0x100092 kqread dhcpleased 15324 163350 1 0 3 0x80 kqread dhcpleased 93224 3340 0 0 3 0x14200 bored smr 99653 490134 0 0 2 0x14200 zerothread 71128 225359 0 0 3 0x14200 aiodoned aiodoned 89794 403679 0 0 3 0x14200 syncer update 57881 122261 0 0 3 0x14200 cleaner cleaner 75783 103554 0 0 3 0x14200 reaper reaper 7124 19444 0 0 3 0x14200 pgdaemon pagedaemon 15418 109341 0 0 3 0x14200 bored viomb 73524 112124 0 0 3 0x40014200 acpi0 acpi0 39818 345445 0 0 3 0x40014200 idle1 34078 167192 0 0 3 0x14200 bored softnet7 72272 388497 0 0 3 0x14200 bored softnet6 28677 102398 0 0 3 0x14200 bored softnet5 73107 271083 0 0 3 0x14200 bored softnet4 15860 377773 0 0 3 0x14200 bored softnet3 46721 491213 0 0 3 0x14200 bored softnet2 81859 4755 0 0 3 0x14200 bored softnet1 42106 405507 0 0 3 0x14200 bored softnet0 43610 6225 0 0 3 0x14200 bored systqmp 70614 435497 0 0 3 0x14200 bored systq 25345 343137 0 0 3 0x14200 tmoslp softclockmp 33923 439194 0 0 3 0x40014200 tmoslp softclock 76445 199478 0 0 3 0x40014200 idle0 1 56502 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 29502 (syz-executor) thread 0xffff80002a2e4a80 (187996) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83934748) #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 sleep_finish+0x2d8 sys/kern/kern_synch.c:367 #3 rw_do_enter_read+0x309 sys/kern/kern_rwlock.c:-1 #4 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1924 #5 uvm_fault_check+0x4a sys/uvm/uvm_fault.c:741 #6 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #7 kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283 #8 kerntrap+0x198 sys/arch/amd64/amd64/trap.c:489 #9 alltraps_kern_meltdown+0x7b #10 _copyin+0x66 #11 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 #12 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10203 10957K 10968K 166960K 11281 0 pcb 17 12K 12K 166960K 17 0 rtable 211 6K 6K 166960K 273 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 4 1K 9K 166960K 8 0 counters 68 36K 36K 166960K 68 0 ioctlops 0 0K 2K 166960K 30 0 iov 1 12K 24K 166960K 15 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1335 84K 84K 166960K 1391 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 11 0K 0K 166960K 14 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 26 97K 117K 166960K 324 0 sigio 1 0K 0K 166960K 7 0 proc 59 115K 147K 166960K 516 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 99 7K 7K 166960K 102 0 ether_multi 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 121 546K 546K 166960K 121 0 exec 0 0K 1K 166960K 362 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 271 177K 187K 166960K 4714 0 UVM aobj 14 2K 3K 166960K 17 0 pinsyscall 49 98K 108K 166960K 1361 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 12 0 NDP 11 0K 2K 166960K 27 0 temp 38 8638K 8704K 166960K 5027 0 kqueue 15 24K 29K 166960K 77 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 53 0 50 1 0 1 1 0 8 0 rtentry 176 98 0 1 5 0 5 5 0 8 0 unpcb 144 150 0 131 1 0 1 1 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 87 0 76 2 0 2 2 0 8 1 arp 136 12 0 0 1 0 1 1 0 8 0 ipq 40 6 0 2 1 0 1 1 0 8 0 ipqe 40 10 0 5 1 0 1 1 0 8 0 inpcb 328 356 0 340 7 0 7 7 0 8 5 ip6q 72 1 0 0 1 0 1 1 0 8 0 nd6 144 17 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 441 0 0 28 0 28 28 0 8 0 art_table 40 442 0 0 5 0 5 5 0 8 0 art_node 32 98 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 12 0 3 1 0 1 1 0 8 0 shmpl 112 14 0 3 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1840 0 335 95 0 95 95 0 8 0 ffsino 296 1840 0 335 117 0 117 117 0 8 0 nchpl 144 2285 0 611 63 0 63 63 0 8 0 uvmvnodes 80 1921 0 0 40 0 40 40 0 8 0 vnodes 216 1921 0 0 107 0 107 107 0 8 0 namei 1024 7277 0 7277 1 0 1 1 0 8 1 percpumem 16 49 0 0 1 0 1 1 0 8 0 kstatmem 264 24 0 0 2 0 2 2 0 8 0 scxspl 216 7808 0 7808 4 1 3 3 1 8 3 plimitpl 152 62 0 37 2 0 2 2 0 8 1 sigapl 424 612 0 550 8 0 8 8 0 8 0 knotepl 120 525 0 0 16 0 16 16 0 8 0 kqueuepl 224 209 0 197 5 0 5 5 0 8 4 pipepl 344 183 0 155 9 0 9 9 0 8 6 fdescpl 528 589 0 550 3 0 3 3 0 8 0 filepl 160 3068 0 2833 18 0 18 18 0 8 7 lockfpl 104 50 0 46 1 0 1 1 0 8 0 lockfspl 48 21 0 18 1 0 1 1 0 8 0 sessionpl 144 22 0 5 1 0 1 1 0 8 0 pgrppl 48 33 0 8 1 0 1 1 0 8 0 ucredpl 104 463 0 444 1 0 1 1 0 8 0 zombiepl 144 551 0 550 1 0 1 1 0 8 0 processpl 1232 612 0 550 7 1 6 6 0 8 0 procpl 664 952 0 878 7 0 7 7 0 8 0 sosppl 168 5 0 4 1 0 1 1 0 8 0 sockpl 752 561 0 523 10 0 10 10 0 8 6 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 105 0 0 14 0 14 14 0 8 0 mcl2k 2048 36 0 0 5 0 5 5 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 210 0 0 14 0 14 14 0 8 0 bufpl 280 3200 0 117 221 0 221 221 0 8 0 anonpl 32 7801 0 0 63 0 63 63 0 246 0 amapchunkpl 152 14699 0 14109 36 2 34 34 0 158 9 amappl16 200 2183 0 2156 6 0 6 6 0 8 3 amappl15 192 21 0 21 1 1 0 1 0 8 0 amappl14 184 109 0 98 1 0 1 1 0 8 0 amappl13 176 7 0 7 1 1 0 1 0 8 0 amappl12 168 1203 0 1165 2 0 2 2 0 8 0 amappl11 160 47 0 37 1 0 1 1 0 8 0 amappl10 152 3 0 3 1 1 0 1 0 8 0 amappl9 144 263 0 263 1 1 0 1 0 8 0 amappl8 136 21 0 19 1 0 1 1 0 8 0 amappl7 128 96 0 85 1 0 1 1 0 8 0 amappl6 120 170 0 166 1 0 1 1 0 8 0 amappl5 112 112 0 106 1 0 1 1 0 8 0 amappl4 104 268 0 252 1 0 1 1 0 8 0 amappl3 96 2262 0 2151 4 0 4 4 0 8 0 amappl2 88 843 0 758 2 0 2 2 0 8 0 amappl1 80 8840 0 8186 14 0 14 14 0 8 0 amappl 88 4018 0 3820 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 16 0 3 1 0 1 1 0 8 0 uaddrrnd 24 589 0 550 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 589 0 550 1 0 1 1 0 8 0 vmmpekpl 168 6521 0 6484 3 0 3 3 0 8 1 vmmpepl 168 43631 0 41329 101 0 101 101 0 357 0 vmsppl 488 588 0 550 7 1 6 6 0 8 0 rwobjpl 80 16323 0 13438 60 0 60 60 0 8 1 pdppl 4096 1186 0 1100 110 24 86 94 0 8 0 pvpl 32 16321 0 0 132 0 132 132 0 265 0 pmappl 256 588 0 550 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 284 0 27 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(ffffffff83833ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff83934540) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83934540) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 syscall(ffff80002f3fd5e0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80002f3fd5e0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x714683612d30, count: -7 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{1}> trace sys_semop(ffff80002a2e4a80,ffff80003c470ff0,ffff80003c470f40) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003c470ff0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c470ff0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe48493e06d0, count: -3