login: kernel: protection fault trap, code=0 Stopped at sys_semop+0x45b: 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(ffff8000337e6f88,ffff800038827290,ffff8000388271e0) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff800038827290) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800038827290) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x14ee01e0820, count: -3 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff8000388271b0 rbx 0 rdx 0 rcx 0xffff8000337e6f88 rax 0xdeafbeaddeafbead r8 0x7f7fffffc000 r9 0xfffffd80097fb3a8 r10 0x635b535cb18331c0 r11 0x3190c72f7933f479 r12 0xffff80000148fb04 r13 0 r14 0xffff800038827290 r15 0 rip 0xffffffff82df395b sys_semop+0x45b cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800038827090 ss 0x10 sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{1}> show proc PROC (syz-executor) tid=304488 pid=29647 tcnt=4 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2d4f78,0xffff8000337e7c68 process=0xffff80003781abb8 user=0xffff800038822000, vmspace=0xfffffd806c228d48 estcpu=24, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 71452 281010 3465 32767 2 0x10 syz-executor 29647 108678 88233 32767 7 0x10 syz-executor *29647 304488 88233 32767 7 0x4000010 syz-executor 29647 82190 88233 32767 3 0x4000090 fsleep syz-executor 29647 387546 88233 32767 2 0x4000010 syz-executor 7126 346421 28898 32767 3 0x90 nanoslp syz-executor 7126 16052 28898 32767 3 0x4000090 kqread syz-executor 7126 75732 28898 32767 3 0x4000090 kqread syz-executor 7126 349515 28898 32767 3 0x4000090 fsleep syz-executor 75883 405317 91940 32767 3 0x90 nanoslp syz-executor 75883 512283 91940 32767 3 0x4000090 kqpoll syz-executor 75883 299859 91940 32767 3 0x4000090 fsleep syz-executor 30606 30615 23036 32767 3 0x90 nanoslp syz-executor 30606 432218 23036 32767 3 0x4000090 fsleep syz-executor 30606 267402 23036 32767 3 0x4000090 lockf syz-executor 30606 218321 23036 32767 3 0x4000090 fsleep syz-executor 28944 344372 15774 32767 3 0x90 nanoslp syz-executor 28944 422771 15774 32767 3 0x4000090 ttyout syz-executor 28944 211971 15774 32767 3 0x4000090 fsleep syz-executor 40787 339016 25535 32767 3 0x90 nanoslp syz-executor 40787 457245 25535 32767 3 0x4000090 kqread syz-executor 40787 400900 25535 32767 3 0x4000090 fsleep syz-executor 40787 169122 25535 32767 3 0x4000090 fsleep syz-executor 40787 450732 25535 32767 3 0x4000090 sbwait syz-executor 54481 78919 0 0 3 0x14200 bored sosplice 88233 58984 6566 32767 3 0x90 nanoslp syz-executor 11503 99615 13259 32767 3 0x10 biowait syz-executor 15774 33229 36891 32767 3 0x90 nanoslp syz-executor 23036 18116 16681 32767 3 0x90 nanoslp syz-executor 3465 497333 4139 32767 3 0x90 nanoslp syz-executor 91940 245354 19109 32767 3 0x90 nanoslp syz-executor 25535 160086 42495 32767 2 0x10 syz-executor 28898 475019 57376 32767 3 0x90 nanoslp syz-executor 13259 25453 98030 0 3 0x82 wait syz-executor 36891 219096 98030 0 3 0x82 wait syz-executor 6566 167065 98030 0 3 0x82 wait syz-executor 4139 359196 98030 0 3 0x82 wait syz-executor 16681 27830 98030 0 3 0x82 wait syz-executor 19109 31993 98030 0 3 0x82 wait syz-executor 42495 355675 98030 0 3 0x82 wait syz-executor 57376 366304 98030 0 3 0x82 wait syz-executor 98030 369350 72072 0 3 0x82 kqread syz-executor 72072 259108 60416 0 3 0x10008a sigsusp ksh 60416 380401 82282 0 3 0x98 kqread sshd-session 82282 306470 50117 0 3 0x92 kqread sshd-session 88993 403092 1 0 3 0x100083 ttyin getty 50117 17568 1 0 3 0x88 kqread sshd 74299 342318 83720 73 3 0x1100090 kqread syslogd 83720 240966 1 0 3 0x100082 sbwait syslogd 41279 93908 1 0 3 0x100080 kqread resolvd 28902 103279 44540 77 3 0x100092 kqread dhcpleased 45723 318529 44540 77 3 0x100092 kqread dhcpleased 44540 69199 1 0 3 0x80 kqread dhcpleased 33015 442004 0 0 3 0x14200 bored smr 78497 15032 0 0 2 0x14200 zerothread 81492 254091 0 0 3 0x14200 aiodoned aiodoned 15112 218661 0 0 3 0x14200 syncer update 64819 165262 0 0 3 0x14200 cleaner cleaner 24800 21865 0 0 3 0x14200 reaper reaper 47076 81200 0 0 3 0x14200 pgdaemon pagedaemon 54206 459807 0 0 3 0x14200 bored viomb 45814 74585 0 0 3 0x40014200 acpi0 acpi0 80654 151972 0 0 3 0x40014200 idle1 66987 271001 0 0 3 0x14200 bored softnet3 13588 333791 0 0 3 0x14200 bored softnet2 24047 499000 0 0 3 0x14200 bored softnet1 82879 69480 0 0 3 0x14200 bored softnet0 49063 300659 0 0 3 0x14200 bored systqmp 60259 117543 0 0 3 0x14200 bored systq 37013 492822 0 0 3 0x14200 tmoslp softclockmp 96697 314037 0 0 3 0x40014200 tmoslp softclock 92455 194258 0 0 3 0x40014200 idle0 1 292557 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 29647 (syz-executor) thread 0xffff8000337e6f88 (304488) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83913120) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 sleep_finish+0x2da sys/kern/kern_synch.c:366 #3 rw_do_enter_write+0x1d3 sys/kern/kern_rwlock.c:291 #4 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5168 #5 uvmfault_lookup+0xe8 sys/uvm/uvm_fault.c:1918 #6 uvm_fault_check+0x8a5 uvmfault_amapcopy sys/uvm/uvm_fault.c:235 [inline] #6 uvm_fault_check+0x8a5 sys/uvm/uvm_fault.c:784 #7 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #8 kpageflttrap+0x2d0 sys/arch/amd64/amd64/trap.c:283 #9 kerntrap+0x116 sys/arch/amd64/amd64/trap.c:487 #10 alltraps_kern_meltdown+0x7b #11 _copyin+0x57 #12 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 #13 Xsyscall+0x128 Process 11503 (syz-executor) thread 0xffff80002a3c34a0 (99615) exclusive rrwlock inode r = 0 (0xfffffd806cc91f78) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2bd sys/kern/vfs_subr.c:693 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1864 #13 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806cc91438) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1864 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10187 10955K 10967K 166960K 11265 0 pcb 17 12K 12K 166960K 17 0 rtable 239 6K 7K 166960K 349 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 3 1K 9K 166960K 7 0 counters 68 36K 36K 166960K 68 0 ioctlops 0 0K 2K 166960K 29 0 iov 0 0K 4K 166960K 2 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1354 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 6 0K 0K 166960K 7 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 25 93K 125K 166960K 183 0 proc 58 79K 115K 166960K 479 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 4 0K 0K 166960K 14 0 in_multi 104 7K 7K 166960K 105 0 ether_multi 3 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 49 228K 228K 166960K 49 0 exec 0 0K 1K 166960K 342 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 257 168K 176K 166960K 3129 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 46 92K 112K 166960K 1180 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 15 0K 2K 166960K 27 0 temp 37 8674K 8738K 166960K 3794 0 kqueue 14 22K 26K 166960K 33 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 34 0 31 1 0 1 1 0 8 0 rtentry 176 112 0 1 6 0 6 6 0 8 0 unpcb 144 58 0 41 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 31 0 25 2 0 2 2 0 8 1 arp 128 19 0 0 1 0 1 1 0 8 0 inpcb 328 113 0 101 2 0 2 2 0 8 0 nd6 144 24 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 256 454 0 0 29 0 29 29 0 8 0 art_table 32 455 0 0 4 0 4 4 0 8 0 art_node 16 111 0 10 1 0 1 1 0 8 0 semapl 112 4 0 1 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1596 0 93 95 0 95 95 0 8 0 ffsino 288 1596 0 93 108 0 108 108 0 8 0 nchpl 144 1835 0 162 63 0 63 63 0 8 0 uvmvnodes 80 1677 0 0 35 0 35 35 0 8 0 vnodes 216 1677 0 0 94 0 94 94 0 8 0 namei 1024 5385 0 5385 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 5872 0 5871 3 1 2 2 1 8 1 plimitpl 152 40 0 15 2 0 2 2 0 8 0 sigapl 424 455 0 399 8 0 8 8 0 8 0 knotepl 120 358 0 0 11 0 11 11 0 8 0 kqueuepl 224 36 0 20 3 0 3 3 0 8 1 pipepl 336 100 0 73 3 0 3 3 0 8 0 fdescpl 520 436 0 399 4 0 4 4 0 8 0 filepl 160 1530 0 1311 10 0 10 10 0 8 0 lockfpl 104 25 0 21 1 0 1 1 0 8 0 lockfspl 48 8 0 5 1 0 1 1 0 8 0 sessionpl 144 22 0 6 1 0 1 1 0 8 0 pgrppl 48 30 0 6 1 0 1 1 0 8 0 ucredpl 104 144 0 125 1 0 1 1 0 8 0 zombiepl 144 399 0 399 1 0 1 1 0 8 1 processpl 1240 455 0 399 5 0 5 5 0 8 0 procpl 656 536 0 463 7 0 7 7 0 8 0 sockpl 728 206 0 174 4 0 4 4 0 8 0 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 15 0 0 2 0 2 2 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1250 0 0 79 0 79 79 0 8 0 bufpl 280 2280 0 116 155 0 155 155 0 8 0 anonpl 32 7258 0 0 59 0 59 59 0 246 0 amapchunkpl 152 9374 0 8800 32 0 32 32 0 158 6 amappl16 200 2088 0 2067 5 0 5 5 0 8 3 amappl15 192 4 0 4 1 0 1 1 0 8 1 amappl14 184 102 0 92 1 0 1 1 0 8 0 amappl13 176 7 0 7 1 0 1 1 0 8 1 amappl12 168 1029 0 993 3 1 2 2 0 8 0 amappl11 160 49 0 39 1 0 1 1 0 8 0 amappl10 152 5 0 4 1 0 1 1 0 8 0 amappl9 144 258 0 258 1 0 1 1 0 8 1 amappl8 136 19 0 18 1 0 1 1 0 8 0 amappl7 128 97 0 87 1 0 1 1 0 8 0 amappl6 120 174 0 171 1 0 1 1 0 8 0 amappl5 112 117 0 111 1 0 1 1 0 8 0 amappl4 104 273 0 258 1 0 1 1 0 8 0 amappl3 96 1434 0 1303 4 0 4 4 0 8 0 amappl2 88 604 0 548 2 0 2 2 0 8 0 amappl1 80 8072 0 7503 14 0 14 14 0 8 1 amappl 88 2511 0 2320 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 436 0 399 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 436 0 399 1 0 1 1 0 8 0 vmmpekpl 168 5181 0 5145 2 0 2 2 0 8 0 vmmpepl 168 34524 0 32407 99 0 99 99 0 357 2 vmsppl 480 435 0 399 6 0 6 6 0 8 0 rwobjpl 72 14215 0 11684 48 1 47 48 0 8 0 pdppl 4096 879 0 798 109 22 87 97 0 8 6 pvpl 32 13385 0 0 108 0 108 108 0 265 0 pmappl 256 435 0 399 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 457 0 24 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff83866ff0) 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+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff83912f18) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83912f18) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 intr_handler(ffff800035c110c0,ffff800000079a80) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7b9321b06a70, count: -7 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{1}> trace sys_semop(ffff8000337e6f88,ffff800038827290,ffff8000388271e0) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff800038827290) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800038827290) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x14ee01e0820, count: -3