kernel: protection fault trap, code=0 Stopped at sys_semop+0x3d5: movzwl 0(%rax),%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(ffff8000ffff2a78,ffff80003c444ff0,ffff80003c444f40) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003c444ff0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c444ff0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8fc88d6f4c0, count: -3 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003c444f10 rbx 0xdeafbeaddeafbead rdx 0 rcx 0xffff8000ffff2a78 rax 0xdeafbeaddeafbead r8 0x7f7fffffc000 r9 0xfffffd80097fb068 r10 0x146fd4bf3e11783b r11 0xccd0ed952439cb7e r12 0 r13 0xfffffd80669fdc40 r14 0xffff80003c444ff0 r15 0 rip 0xffffffff81ed89d5 sys_semop+0x3d5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c444e20 ss 0x10 sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{0}> show proc PROC (syz-executor) tid=293936 pid=50596 tcnt=3 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=69, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffe94e8,0xffff8000fffe9a28 process=0xffff8000fffe61d0 user=0xffff80003c440000, vmspace=0xfffffd806c1757d0 estcpu=19, cpticks=6, pctcpu=0.0, user=0, sys=6, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 89843 415676 79999 32767 2 0x10 syz-executor 89843 4770 79999 32767 3 0x4000090 fsleep syz-executor 39393 243496 7359 32767 2 0x10 syz-executor 39393 368890 7359 32767 3 0x4000090 fsleep syz-executor 20168 2037 37683 32767 2 0x10 syz-executor 20168 5711 37683 32767 3 0x4000090 fsleep syz-executor 60443 170778 84394 32767 2 0x10 syz-executor 60443 375185 84394 32767 3 0x4000090 fsleep syz-executor 50596 251264 36358 32767 2 0x10 syz-executor *50596 293936 36358 32767 7 0x4000010 syz-executor 50596 467197 36358 32767 7 0x4000010 syz-executor 22688 355064 3259 32767 3 0x90 nanoslp syz-executor 22688 205437 3259 32767 3 0x4000090 lockf syz-executor 22688 508145 3259 32767 3 0x4000090 fsleep syz-executor 2268 302740 56495 32767 3 0x90 nanoslp syz-executor 2268 190451 56495 32767 3 0x4000090 fsleep syz-executor 2268 251490 56495 32767 3 0x4000090 lockf syz-executor 2268 192670 56495 32767 3 0x4000090 fsleep syz-executor 36358 22128 90165 32767 3 0x90 nanoslp syz-executor 79999 429228 60678 32767 3 0x90 nanoslp syz-executor 84394 251783 9756 32767 3 0x90 nanoslp syz-executor 3259 116128 53980 32767 3 0x90 nanoslp syz-executor 37683 95126 92529 32767 3 0x90 nanoslp syz-executor 7359 236881 15998 32767 3 0x90 nanoslp syz-executor 56495 269119 71002 32767 3 0x90 nanoslp syz-executor 57695 40893 36556 32767 2 0x10 syz-executor 71002 353040 78859 0 3 0x82 wait syz-executor 15998 108465 78859 0 3 0x82 wait syz-executor 90165 483079 78859 0 3 0x82 wait syz-executor 36556 120950 78859 0 3 0x82 wait syz-executor 60678 278038 78859 0 3 0x82 wait syz-executor 53980 478681 78859 0 3 0x82 wait syz-executor 9756 250091 78859 0 3 0x82 wait syz-executor 92529 372673 78859 0 3 0x82 wait syz-executor 78859 224714 95697 0 3 0x82 kqread syz-executor 95697 9376 73460 0 3 0x10008a sigsusp ksh 73460 91906 33109 0 3 0x98 kqread sshd-session 33109 428880 42202 0 3 0x92 kqread sshd-session 84387 162379 1 0 3 0x100083 ttyin getty 42202 385349 1 0 3 0x88 kqread sshd 8589 170950 31365 73 3 0x1100090 kqread syslogd 31365 114970 1 0 3 0x100082 sbwait syslogd 74860 184466 1 0 3 0x100080 kqread resolvd 38263 223440 62718 77 3 0x100092 kqread dhcpleased 989 442614 62718 77 3 0x100092 kqread dhcpleased 62718 451387 1 0 3 0x80 kqread dhcpleased 27230 420968 0 0 3 0x14200 bored smr 61812 33019 0 0 2 0x14200 zerothread 31111 61214 0 0 3 0x14200 aiodoned aiodoned 67162 66256 0 0 3 0x14200 syncer update 60667 253903 0 0 3 0x14200 cleaner cleaner 1835 356560 0 0 3 0x14200 reaper reaper 96870 115034 0 0 3 0x14200 pgdaemon pagedaemon 78556 412561 0 0 3 0x14200 bored viomb 98063 389956 0 0 3 0x40014200 acpi0 acpi0 6539 489075 0 0 3 0x40014200 idle1 57050 179636 0 0 3 0x14200 bored softnet1 90271 178154 0 0 3 0x14200 bored softnet0 85596 315978 0 0 3 0x14200 bored systqmp 98457 365832 0 0 3 0x14200 bored systq 78691 111878 0 0 3 0x14200 tmoslp softclockmp 97775 192007 0 0 3 0x40014200 tmoslp softclock 45001 450611 0 0 3 0x40014200 idle0 1 450163 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 50596 (syz-executor) thread 0xffff8000ffff2a78 (293936) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83939538) #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_write+0x1dc sys/kern/kern_rwlock.c:298 #4 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5171 #5 uvmfault_lookup+0xe8 sys/uvm/uvm_fault.c:1896 #6 uvm_fault_check+0x38c sys/uvm/uvm_fault.c:699 #7 uvm_fault+0x106 sys/uvm/uvm_fault.c:633 #8 kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283 #9 kerntrap+0x19c sys/arch/amd64/amd64/trap.c:510 #10 alltraps_kern_meltdown+0x7b #11 _copyin+0x66 #12 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #13 Xsyscall+0x128 Process 57695 (syz-executor) thread 0xffff8000ffff34d8 (40893) exclusive rrwlock inode r = 0 (0xfffffd806a257c70) #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 vget+0x2a2 sys/kern/vfs_subr.c:687 #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+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #11 namei+0x7ca sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806d5a37c0) #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 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10186 10955K 10968K 166960K 11277 0 pcb 17 12K 12K 166960K 17 0 rtable 239 6K 7K 166960K 351 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 1 1K 9K 166960K 5 0 counters 68 36K 36K 166960K 68 0 ioctlops 0 0K 2K 166960K 30 0 iov 0 0K 12K 166960K 3 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1336 84K 84K 166960K 1361 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 5 0K 0K 166960K 6 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 25 93K 121K 166960K 196 0 sigio 0 0K 0K 166960K 1 0 proc 58 99K 163K 166960K 476 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 7 0 in_multi 99 7K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 360 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 252 151K 161K 166960K 3315 0 UVM aobj 7 2K 2K 166960K 7 0 pinsyscall 46 92K 110K 166960K 1242 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 4 0 NDP 13 0K 2K 166960K 27 0 temp 37 8646K 8710K 166960K 3989 0 kqueue 15 24K 31K 166960K 39 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 39 0 35 1 0 1 1 0 8 0 rtentry 176 112 0 1 6 0 6 6 0 8 0 unpcb 144 71 0 49 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 36 0 27 2 0 2 2 0 8 1 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 112 0 99 2 0 2 2 0 8 0 nd6 152 25 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 256 468 0 0 30 0 30 30 0 8 0 art_table 40 469 0 0 5 0 5 5 0 8 0 art_node 32 112 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 2 1 0 1 1 0 8 1 semapl 112 4 0 1 1 0 1 1 0 8 0 shmpl 112 4 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1624 0 117 95 0 95 95 0 8 0 ffsino 296 1624 0 117 117 0 117 117 0 8 0 nchpl 144 1886 0 199 63 0 63 63 0 8 0 vnodes 216 1705 0 0 95 0 95 95 0 8 0 namei 1024 5429 0 5429 2 0 2 2 0 8 2 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 6593 0 6593 10 2 8 8 1 8 8 plimitpl 152 40 0 14 2 0 2 2 0 8 1 sigapl 424 478 0 425 7 0 7 7 0 8 0 knotepl 120 784 0 0 24 0 24 24 0 8 0 kqueuepl 224 101 0 90 5 0 5 5 0 8 4 pipepl 344 112 0 85 3 0 3 3 0 8 0 fdescpl 528 462 0 425 3 0 3 3 0 8 0 filepl 160 1723 0 1496 13 0 13 13 0 8 3 lockfpl 104 41 0 35 1 0 1 1 0 8 0 lockfspl 48 12 0 8 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 104 138 0 119 1 0 1 1 0 8 0 zombiepl 144 425 0 425 1 0 1 1 0 8 1 processpl 1232 478 0 425 5 0 5 5 0 8 0 procpl 664 583 0 519 7 0 7 7 0 8 1 sockpl 752 222 0 183 5 0 5 5 0 8 1 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 15 0 15 15 0 8 0 mcl2k 2048 22 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 207 0 0 13 0 13 13 0 8 0 bufpl 280 2439 0 118 166 0 166 166 0 8 0 anonpl 32 5379 0 0 44 0 44 44 0 246 0 amapchunkpl 152 9795 0 9245 29 0 29 29 0 158 5 amappl16 200 1945 0 1924 5 0 5 5 0 8 3 amappl15 192 5 0 5 2 1 1 1 0 8 1 amappl14 184 4 0 4 1 0 1 1 0 8 1 amappl13 176 393 0 392 1 0 1 1 0 8 0 amappl12 168 802 0 756 3 0 3 3 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 45 0 33 1 0 1 1 0 8 0 amappl9 144 241 0 241 2 1 1 1 0 8 1 amappl8 136 27 0 26 1 0 1 1 0 8 0 amappl7 128 77 0 76 1 0 1 1 0 8 0 amappl6 120 267 0 256 1 0 1 1 0 8 0 amappl5 112 80 0 73 1 0 1 1 0 8 0 amappl4 104 388 0 365 1 0 1 1 0 8 0 amappl3 96 1530 0 1428 3 0 3 3 0 8 0 amappl2 88 582 0 504 2 0 2 2 0 8 0 amappl1 80 9126 0 8564 14 0 14 14 0 8 0 amappl 88 2635 0 2451 5 0 5 5 0 92 0 uvmvnodes 80 1705 0 0 35 0 35 35 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 128 253 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 6 0 0 1 0 1 1 0 8 0 uaddrrnd 24 462 0 425 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 462 0 425 1 0 1 1 0 8 0 vmmpekpl 168 5508 0 5478 2 0 2 2 0 8 0 vmmpepl 168 37217 0 35171 99 0 99 99 0 357 6 vmsppl 488 461 0 425 7 1 6 6 0 8 0 rwobjpl 80 15261 0 12719 54 0 54 54 0 8 0 pdppl 4096 932 0 850 106 18 88 96 0 8 6 pvpl 32 13061 0 0 106 0 106 106 0 265 0 pmappl 256 461 0 425 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 280 0 21 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff8000ffff2a78,ffff80003c444ff0,ffff80003c444f40) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003c444ff0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c444ff0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8fc88d6f4c0, 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 __mp_lock(ffffffff83939330) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83939330) at __mp_lock+0x192 sys/kern/kern_lock.c:165 syscall(ffff80003c4369e0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003c4369e0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8fcd2c4c890, count: -6