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(ffff8000fffeb4a8,ffff80003c45b380,ffff80003c45b2d0) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80003c45b380) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c45b380) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x833407e7b00, count: -3 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c45b2a0 rbx 0 rdx 0 rcx 0xffff8000fffeb4a8 rax 0xdeafbeaddeafc0d5 r8 0x7f7fffffc000 r9 0x1 r10 0xd2a367247a5b285b r11 0xe76182a22f7405f0 r12 0xffff8000014e6c04 r13 0 r14 0xffff80003c45b380 r15 0 rip 0xffffffff82ff2a3b sys_semop+0x45b cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c45b180 ss 0x10 sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{1}> show proc PROC (syz-executor) tid=392281 pid=33820 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=79, usrpri=79, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffea2b8,0xffff8000fffeb228 process=0xffff8000fffe4e18 user=0xffff80003c456000, vmspace=0xfffffd806be34018 estcpu=29, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 40089 117542 51612 0 7 0 syz-executor 40089 145174 51612 0 3 0x4000080 ttyout syz-executor 33820 288291 95326 0 2 0 syz-executor *33820 392281 95326 0 7 0x4000000 syz-executor 33820 245856 95326 0 2 0x4000000 syz-executor 33820 522036 95326 0 3 0x4000080 fsleep syz-executor 76274 90553 80755 0 2 0 syz-executor 76274 445989 80755 0 3 0x4000080 fsleep syz-executor 76274 61995 80755 0 2 0x4000000 syz-executor 98891 141047 77249 0 3 0x80 nanoslp syz-executor 98891 252027 77249 0 3 0x4000080 nanoslp syz-executor 98891 170227 77249 0 3 0x4000080 fsleep syz-executor 94507 497120 0 0 3 0x14200 bored sosplice 35151 138742 59841 0 3 0x82 nanoslp syz-executor 92674 150472 59841 0 3 0x82 nanoslp syz-executor 4493 344523 59841 0 2 0x2 syz-executor 80755 477821 59841 0 3 0x82 nanoslp syz-executor 77249 139750 59841 0 3 0x82 nanoslp syz-executor 95326 382665 59841 0 3 0x82 nanoslp syz-executor 51612 171073 59841 0 3 0x82 nanoslp syz-executor 24332 81800 59841 0 2 0x2 syz-executor 59841 319694 80505 0 3 0x82 kqread syz-executor 80505 232130 17918 0 3 0x10008a sigsusp ksh 17918 401376 7176 0 3 0x98 kqread sshd-session 7176 217607 58766 0 3 0x92 kqread sshd-session 99168 414040 1 0 3 0x100083 ttyin getty 58766 335028 1 0 3 0x88 kqread sshd 35338 437583 9565 74 3 0x1100092 bpf pflogd 9565 457904 1 0 3 0x80 sbwait pflogd 80552 227740 76632 73 3 0x1100090 kqread syslogd 76632 14230 1 0 3 0x100082 sbwait syslogd 22696 192207 1 0 3 0x100080 kqread resolvd 88455 115194 17728 77 3 0x100092 kqread dhcpleased 48654 272691 17728 77 3 0x100092 kqread dhcpleased 17728 246485 1 0 3 0x80 kqread dhcpleased 36392 496808 0 0 3 0x14200 bored smr 12145 124525 0 0 2 0x14200 zerothread 99454 210036 0 0 3 0x14200 aiodoned aiodoned 83062 17570 0 0 3 0x14200 syncer update 23499 354761 0 0 3 0x14200 cleaner cleaner 47115 143011 0 0 3 0x14200 reaper reaper 67268 393080 0 0 3 0x14200 pgdaemon pagedaemon 19480 325407 0 0 3 0x14200 bored viomb 31643 77932 0 0 3 0x40014200 acpi0 acpi0 58073 376137 0 0 3 0x40014200 idle1 35601 341199 0 0 3 0x14200 bored softnet3 51492 388026 0 0 3 0x14200 bored softnet2 98842 360183 0 0 3 0x14200 bored softnet1 17895 117751 0 0 3 0x14200 bored softnet0 42283 187387 0 0 3 0x14200 bored systqmp 51839 203016 0 0 3 0x14200 bored systq 91675 282324 0 0 3 0x14200 tmoslp softclockmp 70650 425340 0 0 3 0x40014200 tmoslp softclock 30320 394098 0 0 3 0x40014200 idle0 1 462384 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 33820 (syz-executor) thread 0xffff8000fffeb4a8 (392281) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839fad40) #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 mi_switch+0x4b7 sys/kern/sched_bsd.c:441 #3 yield+0x6a sys/kern/sched_bsd.c:320 #4 malloc+0xe5 sys/kern/kern_malloc.c:174 #5 sys_semop+0x234 sys/kern/sysv_sem.c:564 #6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 Process 33820 (syz-executor) thread 0xffff80003a41a7e0 (245856) exclusive rwlock futex r = 0 (0xffffffff837c1f28) #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+0x3ea sys/kern/kern_rwlock.c:316 #2 sys_futex+0x69 sys/kern/sys_futex.c:98 #3 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #4 Xsyscall+0x128 Process 76274 (syz-executor) thread 0xffff80003a41ad00 (61995) exclusive rwlock vmmaplk r = 0 (0xfffffd806be346b8) #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+0x3ea sys/kern/kern_rwlock.c:316 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5250 #3 uvmfault_lookup+0xe8 sys/uvm/uvm_fault.c:1854 #4 uvm_fault_check+0x987 uvmfault_amapcopy sys/uvm/uvm_fault.c:235 [inline] #4 uvm_fault_check+0x987 sys/uvm/uvm_fault.c:772 #5 uvm_fault+0x106 sys/uvm/uvm_fault.c:666 #6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188 #7 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436 #8 recall_trap+0x8 Process 4493 (syz-executor) thread 0xffff8000ffff07d0 (344523) exclusive rwlock vmmaplk r = 0 (0xfffffd806be34c58) #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+0x3ea sys/kern/kern_rwlock.c:316 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5250 #3 uvmspace_fork+0x12b sys/uvm/uvm_map.c:3820 #4 process_new+0x572 sys/kern/kern_fork.c:283 #5 fork1+0x3ea sys/kern/kern_fork.c:409 #6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 exclusive rwlock vmmaplk r = 0 (0xfffffd8009ed2c40) #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+0x3ea sys/kern/kern_rwlock.c:316 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5250 #3 uvmspace_fork+0x44 sys/uvm/uvm_map.c:3811 #4 process_new+0x572 sys/kern/kern_fork.c:283 #5 fork1+0x3ea sys/kern/kern_fork.c:409 #6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 #7 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10198 11040K 11327K 166960K 11739 0 pcb 17 12K 12K 166960K 62 0 rtable 199 7K 8K 166960K 395 0 pf 35 17K 18K 166960K 56 0 ifaddr 37 6K 7K 166960K 52 0 ifgroup 55 2K 2K 166960K 67 0 sysctl 3 1K 1K 166960K 3 0 counters 64 36K 37K 166960K 76 0 ioctlops 0 0K 4K 166960K 1494 0 iov 0 0K 12K 166960K 4 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1339 84K 85K 166960K 1501 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 6 0K 0K 166960K 7 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 97K 166960K 328 0 sigio 0 0K 0K 166960K 66 0 proc 72 91K 152K 166960K 539 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 16 0 in_multi 77 5K 7K 166960K 101 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 392 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 237 151K 165K 166960K 4711 0 UVM aobj 12 2K 2K 166960K 12 0 pinsyscall 43 86K 104K 166960K 1456 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 8 0 NDP 12 0K 1K 166960K 33 0 temp 38 8679K 8745K 166960K 7038 0 kqueue 15 24K 26K 166960K 58 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 81 0 77 2 0 2 2 0 8 1 rtentry 176 114 0 26 5 0 5 5 0 8 0 unpcb 144 311 0 294 4 3 1 4 0 8 0 syncache 336 5 0 5 1 1 0 1 0 8 0 tcpcb 808 73 0 68 3 2 1 3 0 8 0 arp 128 19 0 5 1 0 1 1 0 8 0 inpcb 384 292 0 284 9 7 2 8 0 8 1 nd6 144 24 0 6 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 5 0 5 2 1 1 1 0 8 1 pffrag 232 3 0 0 1 0 1 1 0 482 0 pffrnode 88 3 0 0 1 0 1 1 0 8 0 pffrent 40 3 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 25 0 0 1 0 1 1 0 8 0 pfstkey 128 25 0 0 1 0 1 1 0 8 0 pfstate 384 25 0 0 3 0 3 3 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 459 0 90 29 0 29 29 0 8 0 art_table 32 461 0 90 4 0 4 4 0 8 0 art_node 16 113 0 33 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 0 1 0 1 1 0 8 0 semapl 112 4 0 1 1 0 1 1 0 8 0 shmpl 112 9 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1901 0 398 95 0 95 95 0 8 0 ffsino 288 1901 0 398 109 0 109 109 0 8 0 nchpl 144 2346 0 661 63 0 63 63 0 8 0 rtmask 32 1 0 1 1 1 0 1 0 8 0 uvmvnodes 80 2067 0 0 43 0 43 43 0 8 0 vnodes 216 2067 0 0 115 0 115 115 0 8 0 namei 1024 7336 0 7336 2 1 1 2 0 8 1 percpumem 16 53 0 6 1 0 1 1 0 8 0 kstatmem 264 34 0 10 2 0 2 2 0 8 0 scxspl 216 7335 0 7335 3 2 1 2 1 8 1 plimitpl 152 186 0 169 1 0 1 1 0 8 0 sigapl 424 641 0 590 8 2 6 7 0 8 0 futexpl 64 2837 0 2833 1 0 1 1 0 8 0 knotepl 120 494 0 0 15 0 15 15 0 8 0 kqueuepl 224 105 0 94 3 2 1 3 0 8 0 pipepl 336 186 0 158 8 5 3 8 0 8 0 fdescpl 520 622 0 590 3 0 3 3 0 8 0 filepl 160 2966 0 2741 18 7 11 18 0 8 0 lockfpl 104 52 0 50 1 0 1 1 0 8 0 lockfspl 48 26 0 24 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 34 0 17 1 0 1 1 0 8 0 ucredpl 104 268 0 255 1 0 1 1 0 8 0 zombiepl 144 608 0 606 1 0 1 1 0 8 0 processpl 1192 641 0 590 5 0 5 5 0 8 0 procpl 656 967 0 908 7 1 6 6 0 8 0 srpgc 96 4 0 4 2 1 1 1 0 8 1 sosppl 168 3 0 3 2 1 1 1 0 8 1 sockpl 728 687 0 658 11 5 6 9 0 8 2 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 15 0 15 15 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 0 8 0 mtagpl 96 40 0 0 1 0 1 1 0 8 0 mbufpl 256 1293 0 0 81 0 81 81 0 8 0 bufpl 280 2581 0 123 176 0 176 176 0 8 0 anonpl 32 5479 0 0 45 0 45 45 0 246 0 amapchunkpl 152 14046 0 13549 30 8 22 29 0 158 2 amappl16 200 1400 0 1373 4 2 2 4 0 8 0 amappl15 192 9 0 9 1 1 0 1 0 8 0 amappl14 184 115 0 103 1 0 1 1 0 8 0 amappl13 176 9 0 8 1 0 1 1 0 8 0 amappl12 168 1285 0 1255 4 2 2 3 0 8 0 amappl11 160 55 0 40 1 0 1 1 0 8 0 amappl10 152 4 0 4 1 1 0 1 0 8 0 amappl9 144 256 0 256 1 1 0 1 0 8 0 amappl8 136 18 0 16 1 0 1 1 0 8 0 amappl7 128 114 0 102 1 0 1 1 0 8 0 amappl6 120 185 0 182 1 0 1 1 0 8 0 amappl5 112 119 0 110 1 0 1 1 0 8 0 amappl4 104 327 0 308 1 0 1 1 0 8 0 amappl3 96 2556 0 2442 4 0 4 4 0 8 0 amappl2 88 666 0 605 2 0 2 2 0 8 0 amappl1 80 9571 0 8972 15 0 15 15 0 8 0 amappl 88 3968 0 3802 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 11 0 0 1 0 1 1 0 8 0 uaddrrnd 24 621 0 590 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 621 0 590 1 0 1 1 0 8 0 vmmpekpl 168 7090 0 7057 3 0 3 3 0 8 0 vmmpepl 168 45077 0 43146 90 1 89 90 0 357 0 vmsppl 480 620 0 590 5 1 4 5 0 8 0 rwobjpl 72 16492 0 13484 55 0 55 55 0 8 0 pdppl 4096 1250 0 1180 104 32 72 88 0 8 2 pvpl 32 12177 0 0 99 0 99 99 0 265 0 pmappl 256 620 0 590 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 464 0 43 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(ffffffff837afff0) 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(ffffffff839fab38) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839fab38) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x765c8b3f2b20, count: -7 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x45b: movzwl 0(%rax),%r15d ddb{1}> trace sys_semop(ffff8000fffeb4a8,ffff80003c45b380,ffff80003c45b2d0) at sys_semop+0x45b sys/kern/sysv_sem.c:615 syscall(ffff80003c45b380) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c45b380) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x833407e7b00, count: -3