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(ffff8000fffe2a88,ffff80003c458030,ffff80003c457f80) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003c458030) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c458030) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x91e28003350, count: -3 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003c457f50 rbx 0xdeaf4152deaf4176 rdx 0 rcx 0xffff8000fffe2a88 rax 0xdeaf4152deaf4176 r8 0x7f7fffffc000 r9 0 r10 0x3d5a120cd0bf03d8 r11 0xa23417644bcd74fe r12 0 r13 0xfffffd806c65fa10 r14 0xffff80003c458030 r15 0 rip 0xffffffff819b35f5 sys_semop+0x3d5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c457e60 ss 0x10 sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{0}> show proc PROC (syz-executor) tid=39615 pid=91481 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=77, usrpri=77, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffe2fb8,0xffff8000fffe3260 process=0xffff8000fffe61d0 user=0xffff80003c453000, vmspace=0xfffffd80760d37b8 estcpu=27, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 91481 416760 78059 0 2 0 syz-executor *91481 39615 78059 0 7 0x4000000 syz-executor 91481 427879 78059 0 3 0x4000080 fsleep syz-executor 91608 188373 18814 0 2 0xc80 syz-executor 91608 448242 18814 0 3 0x4000080 sbwait syz-executor 91608 282788 18814 0 3 0x4000080 fsleep syz-executor 67350 116999 78254 0 2 0xc80 syz-executor 67350 172420 78254 0 3 0x4000080 fsleep syz-executor 67350 249746 78254 0 3 0x4000080 fsleep syz-executor 67350 523568 78254 0 3 0x4000080 fsleep syz-executor 88474 448582 82315 0 2 0xc80 syz-executor 88474 494514 82315 0 3 0x4000080 sbwait syz-executor 88474 101906 82315 0 3 0x4000080 fsleep syz-executor 82631 89037 59711 0 3 0x3000 suspend syz-executor 82631 116789 59711 0 2 0x4081000 syz-executor 82631 239069 59711 0 3 0x4081000 inode syz-executor 69083 399236 97748 0 3 0x3000 suspend syz-executor 69083 288790 97748 0 3 0x4081000 inode syz-executor 69083 118985 97748 0 2 0x4081000 syz-executor 69083 341938 97748 0 3 0x4081000 fltagain2 syz-executor 82315 252884 22054 0 3 0x82 nanoslp syz-executor 59711 98777 22054 0 3 0x82 nanoslp syz-executor 86896 21682 22054 0 2 0xc82 syz-executor 50594 202264 22054 0 7 0x10000002 syz-executor 78254 130047 22054 0 2 0xc82 syz-executor 78059 519786 22054 0 2 0xc82 syz-executor 18814 215684 22054 0 2 0xc82 syz-executor 97748 241089 22054 0 2 0xc82 syz-executor 22054 226087 67534 0 3 0x82 kqread syz-executor 67534 483011 57642 0 3 0x10008a sigsusp ksh 57642 119401 55303 0 3 0x98 kqread sshd-session 55303 435658 61796 0 3 0x92 kqread sshd-session 49716 364971 1 0 3 0x100083 ttyin getty 61796 282612 1 0 3 0x88 kqread sshd 70375 253105 42069 74 3 0x1100092 bpf pflogd 42069 114192 1 0 3 0x80 sbwait pflogd 22817 184233 52912 73 3 0x1100090 kqread syslogd 52912 468447 1 0 3 0x100082 sbwait syslogd 15109 215266 1 0 3 0x100080 kqread resolvd 75496 135472 23727 77 3 0x100092 kqread dhcpleased 23775 75349 23727 77 3 0x100092 kqread dhcpleased 23727 188584 1 0 3 0x80 kqread dhcpleased 35123 240481 0 0 3 0x14200 bored smr 44873 517521 0 0 3 0x14200 pgzero zerothread 29389 461492 0 0 3 0x14200 aiodoned aiodoned 61596 174425 0 0 3 0x14200 syncer update 44018 65083 0 0 3 0x14200 cleaner cleaner 46569 522061 0 0 3 0x14200 reaper reaper 43773 199849 0 0 3 0x14200 pgdaemon pagedaemon 37287 395897 0 0 3 0x14200 bored viomb 41664 173820 0 0 3 0x40014200 acpi0 acpi0 46187 426121 0 0 3 0x40014200 idle1 44313 223559 0 0 3 0x14200 bored softnet1 32751 56800 0 0 3 0x14200 bored softnet0 6342 27121 0 0 3 0x14200 bored systqmp 42079 198529 0 0 3 0x14200 bored systq 70537 124921 0 0 3 0x14200 tmoslp softclockmp 88654 55251 0 0 3 0x40014200 tmoslp softclock 85162 291946 0 0 3 0x40014200 idle0 1 246450 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 91481 (syz-executor) thread 0xffff8000fffe2a88 (39615) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83902dc8) #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:175 #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:775 #5 Xsyscall+0x128 Process 82631 (syz-executor) thread 0xffff8000fffe8020 (116789) exclusive rrwlock inode r = 0 (0xfffffd806c8798f8) #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+0xbd 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:775 #9 Xsyscall+0x128 Process 69083 (syz-executor) thread 0xffff8000fffe34e8 (118985) exclusive rwlock vmmaplk r = 0 (0xfffffd80760d3c88) #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_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283 #6 kerntrap+0x19c sys/arch/amd64/amd64/trap.c:520 #7 alltraps_kern_meltdown+0x7b #8 _copyin+0x5b #9 ffs_write+0x769 sys/ufs/ffs/ffs_vnops.c:359 #10 VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 #11 vn_write+0x1d3 sys/kern/vfs_vnops.c:408 #12 dofilewritev+0x242 sys/kern/sys_generic.c:380 #13 sys_write+0xa2 sys/kern/sys_generic.c:300 #14 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #14 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #15 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c879c70) #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+0xbd 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:775 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11054 12085K 12289K 166960K 12220 0 pcb 17 12K 12K 166960K 35 0 rtable 224 7K 8K 166960K 362 0 pf 32 17K 18K 166960K 57 0 ifaddr 39 6K 7K 166960K 52 0 ifgroup 51 2K 2K 166960K 71 0 sysctl 2 1K 9K 166960K 6 0 counters 68 36K 37K 166960K 86 0 ioctlops 0 0K 4K 166960K 1501 0 iov 0 0K 12K 166960K 2 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1338 84K 85K 166960K 1419 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 9 0K 0K 166960K 11 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 222 0 sigio 0 0K 0K 166960K 11 0 proc 71 115K 164K 166960K 538 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 13 0 in_multi 88 6K 7K 166960K 103 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 448 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 269 160K 167K 166960K 3866 0 UVM aobj 8 2K 2K 166960K 8 0 pinsyscall 42 84K 104K 166960K 1354 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 11 0K 2K 166960K 33 0 temp 77 8676K 8742K 166960K 9363 0 kqueue 13 20K 28K 166960K 41 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 176 114 0 13 6 0 6 6 0 8 0 unpcb 144 64 0 47 1 0 1 1 0 8 0 syncache 336 4 0 4 2 1 1 1 0 8 1 tcpcb 736 37 0 33 1 0 1 1 0 8 0 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 132 0 124 3 1 2 2 0 8 1 nd6 152 26 0 3 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 6 0 6 1 1 0 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 1 0 0 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 pfstitem 24 26 0 0 1 0 1 1 0 8 0 pfstkey 128 26 0 0 1 0 1 1 0 8 0 pfstate 448 26 0 0 3 0 3 3 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 488 0 75 31 1 30 31 0 8 1 art_table 40 489 0 75 5 0 5 5 0 8 0 art_node 32 114 0 22 1 0 1 1 0 8 0 semapl 112 8 0 2 1 0 1 1 0 8 0 shmpl 112 5 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1717 0 204 95 0 95 95 0 8 0 ffsino 296 1717 0 204 117 0 117 117 0 8 0 nchpl 144 2035 0 335 64 0 64 64 0 8 0 rtmask 32 3 0 3 1 1 0 1 0 8 0 vnodes 216 1835 0 0 102 0 102 102 0 8 0 namei 1024 6289 0 6289 3 2 1 2 0 8 1 percpumem 16 58 0 9 1 0 1 1 0 8 0 kstatmem 264 36 0 12 3 1 2 3 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 9739 0 9739 9 8 1 8 1 8 1 plimitpl 152 107 0 86 1 0 1 1 0 8 0 sigapl 424 532 0 484 7 1 6 7 0 8 0 knotepl 120 65 0 0 2 0 2 2 0 8 0 kqueuepl 224 56 0 46 1 0 1 1 0 8 0 pipepl 344 131 0 103 4 1 3 4 0 8 0 fdescpl 528 516 0 485 3 0 3 3 0 8 0 filepl 160 2114 0 1885 12 1 11 11 0 8 1 lockfpl 104 22 0 20 1 0 1 1 0 8 0 lockfspl 48 12 0 10 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 34 0 17 1 0 1 1 0 8 0 ucredpl 104 170 0 156 1 0 1 1 0 8 0 zombiepl 144 499 0 495 1 0 1 1 0 8 0 processpl 1232 532 0 484 5 0 5 5 0 8 0 procpl 664 705 0 643 6 0 6 6 0 8 0 sockpl 752 237 0 208 4 0 4 4 0 8 0 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 22 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 154 0 0 10 0 10 10 0 8 0 bufpl 280 3927 0 130 272 0 272 272 0 8 0 anonpl 32 7614 0 0 62 0 62 62 0 246 0 amapchunkpl 152 11155 0 10593 25 2 23 23 0 158 0 amappl16 200 2409 0 2128 17 2 15 15 0 8 0 amappl15 192 49 0 49 1 1 0 1 0 8 0 amappl14 184 8 0 8 1 1 0 1 0 8 0 amappl13 176 428 0 427 1 0 1 1 0 8 0 amappl12 168 881 0 839 3 0 3 3 0 8 0 amappl11 160 3 0 3 1 1 0 1 0 8 0 amappl10 152 53 0 39 1 0 1 1 0 8 0 amappl9 144 281 0 281 1 1 0 1 0 8 0 amappl8 136 27 0 25 1 0 1 1 0 8 0 amappl7 128 79 0 78 1 0 1 1 0 8 0 amappl6 120 336 0 323 1 0 1 1 0 8 0 amappl5 112 74 0 64 1 0 1 1 0 8 0 amappl4 104 425 0 395 1 0 1 1 0 8 0 amappl3 96 1840 0 1734 4 1 3 3 0 8 0 amappl2 88 630 0 553 2 0 2 2 0 8 0 amappl1 80 9621 0 9026 15 1 14 14 0 8 0 amappl 88 3118 0 2930 5 0 5 5 0 92 0 uvmvnodes 80 101 0 0 3 0 3 3 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 7 0 0 1 0 1 1 0 8 0 uaddrrnd 24 516 0 485 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 516 0 485 1 0 1 1 0 8 0 vmmpekpl 168 6161 0 6126 2 0 2 2 0 8 0 vmmpepl 168 41277 0 39078 98 0 98 98 0 357 0 vmsppl 488 515 0 485 5 1 4 5 0 8 0 rwobjpl 80 15067 0 13751 28 0 28 28 0 8 0 pdppl 4096 1040 0 970 100 28 72 86 0 8 2 pvpl 32 13177 0 0 108 1 107 107 0 265 0 pmappl 256 515 0 485 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 275 0 34 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff8000fffe2a88,ffff80003c458030,ffff80003c457f80) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003c458030) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c458030) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x91e28003350, count: -3 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299ddff0) 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(ffffffff83902bc0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83902bc0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 syscall(ffff80002a364a70) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80002a364a70) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a0abc4b8620, count: -7