kernel: protection fault trap, code=0 Stopped at sys_semop+0x352: movzwl 0x8(%rbx),%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(ffff800033409a10,ffff80003c4a7460,ffff80003c4a73b0) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80003c4a7460) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4a7460) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb9989ecc700, count: -3 ddb{1}> show registers rdi 0 rsi 0xb rbp 0xffff80003c4a7380 rbx 0xdead4110dead4110 rdx 0 rcx 0xffff800033409a10 rax 0xffff8000299edff0 r8 0x7f7fffffc000 r9 0x1 r10 0x6bb988e07dc7cccb r11 0x44bfd5b91093f609 r12 0xb r13 0xfffffd805cce2e00 r14 0xffff80003c4a7460 r15 0xb rip 0xffffffff82632192 sys_semop+0x352 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c4a7290 ss 0x10 sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> show proc PROC (syz-executor) tid=91048 pid=2798 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=86, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000334087e8,0xffff800033408d28 process=0xffff8000394244f0 user=0xffff80003c4a2000, vmspace=0xfffffd806a0d2028 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 31738 310557 26551 0 2 0 syz-executor 92885 464561 1242 0 7 0 syz-executor 92885 190754 1242 0 3 0x4000080 fsleep syz-executor 92885 416977 1242 0 2 0x4000000 syz-executor 2798 260078 62560 0 2 0 syz-executor * 2798 91048 62560 0 7 0x4000000 syz-executor 2798 426428 62560 0 3 0x4000080 fsleep syz-executor 6307 280089 66574 60928 2 0x11 syz-executor 6307 478944 66574 60928 3 0x4000090 fsleep syz-executor 6307 248440 66574 60928 3 0x4000090 fsleep syz-executor 6307 524135 66574 60928 3 0x4000090 fsleep syz-executor 60219 7914 17737 -1 2 0x11 syz-executor 60219 448213 17737 -1 3 0x4000090 kqsel syz-executor 60219 254786 17737 -1 3 0x4000090 msgwait syz-executor 60219 187568 17737 -1 3 0x4000090 fsleep syz-executor 57496 370027 34515 0 3 0x82 nanoslp syz-executor 49278 520727 0 0 3 0x14200 acct acct 17737 454072 34515 0 3 0x82 nanoslp syz-executor 1858 178409 0 0 3 0x14200 bored sosplice 26551 216107 34515 0 3 0x82 nanoslp syz-executor 1242 176987 34515 0 3 0x82 nanoslp syz-executor 66574 311703 34515 0 3 0x82 nanoslp syz-executor 62560 293862 34515 0 3 0x82 nanoslp syz-executor 75002 28345 34515 0 3 0x82 wait syz-executor 62599 340217 34515 0 3 0x2 biowait syz-executor 34515 394013 95687 0 3 0x82 kqread syz-executor 95687 409671 13082 0 3 0x10008a sigsusp ksh 13082 481342 81802 0 3 0x98 kqread sshd-session 81802 287964 24041 0 3 0x92 kqread sshd-session 38162 85535 1 0 3 0x100083 ttyin getty 24041 180473 1 0 3 0x88 kqread sshd 41148 88762 7829 74 3 0x1100092 bpf pflogd 7829 29829 1 0 3 0x80 sbwait pflogd 99760 485802 51931 73 3 0x1100090 kqread syslogd 51931 480493 1 0 3 0x100082 sbwait syslogd 76483 117738 1 0 3 0x100080 kqread resolvd 74095 333423 52355 77 3 0x100092 kqread dhcpleased 69932 15155 52355 77 3 0x100092 kqread dhcpleased 52355 141562 1 0 3 0x80 kqread dhcpleased 47845 103680 0 0 3 0x14200 bored smr 79310 157310 0 0 2 0x14200 zerothread 68639 515827 0 0 3 0x14200 aiodoned aiodoned 14323 122356 0 0 3 0x14200 syncer update 90167 191708 0 0 3 0x14200 cleaner cleaner 94616 96156 0 0 3 0x14200 reaper reaper 80515 165039 0 0 3 0x14200 pgdaemon pagedaemon 73810 129612 0 0 3 0x14200 bored viomb 28670 197721 0 0 3 0x40014200 acpi0 acpi0 6610 149757 0 0 3 0x40014200 idle1 28894 221907 0 0 3 0x14200 bored softnet7 30144 208456 0 0 3 0x14200 bored softnet6 28555 373756 0 0 3 0x14200 bored softnet5 79145 240209 0 0 3 0x14200 bored softnet4 31978 334152 0 0 3 0x14200 bored softnet3 53032 465507 0 0 3 0x14200 bored softnet2 78881 393469 0 0 3 0x14200 bored softnet1 78060 70845 0 0 3 0x14200 bored softnet0 84220 180362 0 0 3 0x14200 bored systqmp 34347 276143 0 0 3 0x14200 bored systq 24257 275495 0 0 3 0x14200 tmoslp softclockmp 75899 357808 0 0 3 0x40014200 tmoslp softclock 82001 295555 0 0 3 0x40014200 idle0 1 514082 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 92885 (syz-executor) thread 0xffff800033408550 (416977) exclusive rwlock vmmaplk r = 0 (0xfffffd806a0d2310) #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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5168 #3 uvmfault_lookup+0xe8 sys/uvm/uvm_fault.c:1918 #4 uvm_fault_check+0x895 uvmfault_amapcopy sys/uvm/uvm_fault.c:235 [inline] #4 uvm_fault_check+0x895 sys/uvm/uvm_fault.c:784 #5 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #7 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:603 #8 recall_trap+0x8 Process 2798 (syz-executor) thread 0xffff800033409a10 (91048) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838ad2b8) #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:174 #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:746 #5 Xsyscall+0x128 Process 62599 (syz-executor) thread 0xffff80002a2b82b0 (340217) exclusive rrwlock inode r = 0 (0xfffffd806f573ea8) #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 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3113 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806cd8e8e0) #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 domkdirat+0x8b sys/kern/vfs_syscalls.c:3098 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10211 11102K 11479K 166960K 12102 0 pcb 17 14K 15K 166960K 287 0 rtable 191 8K 8K 166960K 361 0 pf 32 17K 67484K 166960K 129 0 ifaddr 36 6K 7K 166960K 87 0 ifgroup 49 2K 2K 166960K 138 0 sysctl 3 1K 9K 166960K 10 0 counters 68 36K 37K 166960K 168 0 ioctlops 0 0K 4K 166960K 1765 0 iov 0 0K 18K 166960K 70 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1369 86K 86K 166960K 1956 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 15 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 100 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 876 0 sigio 0 0K 0K 166960K 17 0 proc 73 115K 148K 166960K 689 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 104 0 in_multi 79 5K 7K 166960K 152 0 ether_multi 1 0K 0K 166960K 7 0 mrt 0 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 103 466K 466K 166960K 103 0 exec 0 0K 1K 166960K 506 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 240 159K 180K 166960K 9818 0 UVM aobj 19 2K 2K 166960K 22 0 pinsyscall 42 84K 104K 166960K 2056 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 55 0 NDP 11 0K 1K 166960K 62 0 temp 64 8649K 8718K 166960K 27877 0 kqueue 14 22K 28K 166960K 188 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 120 149 0 146 3 2 1 3 0 8 0 rtentry 176 123 0 42 5 0 5 5 0 8 0 unpcb 144 643 0 626 4 3 1 4 0 8 0 syncache 336 5 0 5 2 2 0 1 0 8 0 tcpcb 736 364 0 359 7 6 1 7 0 8 0 arp 136 15 0 4 1 0 1 1 0 8 0 inpcb 328 981 0 972 9 7 2 7 0 8 1 nd6 144 23 0 9 1 0 1 1 0 8 0 pkpcb 40 6 0 6 2 2 0 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 41 0 39 2 1 1 1 0 8 0 pppxif 1504 2 0 2 2 1 1 1 0 8 1 pffrag 232 3 0 2 1 0 1 1 0 482 0 pffrnode 88 3 0 2 1 0 1 1 0 8 0 pffrent 40 13 0 12 1 0 1 1 0 8 0 pfosfp 40 1463 0 1038 5 0 5 5 0 8 0 pfosfpen 112 1463 0 747 21 0 21 21 0 8 0 pfrktable 1344 1 0 1 1 1 0 1 0 8 0 pfstitem 24 68 0 19 1 0 1 1 0 8 0 pfstkey 128 68 0 19 2 0 2 2 0 8 0 pfstate 384 68 0 19 6 0 6 6 0 8 0 pfrule 1344 26 0 20 2 0 2 2 0 8 0 rttmr 136 2 0 2 2 2 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 578 0 213 30 6 24 28 0 8 1 art_table 40 579 0 213 5 0 5 5 0 8 0 art_node 32 123 0 51 1 0 1 1 0 8 0 sysvmsgpl 40 80 0 74 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 95 0 86 1 0 1 1 0 8 0 shmpl 112 19 0 3 1 0 1 1 0 8 0 dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 2932 0 1424 95 0 95 95 0 8 0 ffsino 296 2932 0 1424 117 0 117 117 0 8 0 nchpl 144 4138 0 2444 64 0 64 64 0 8 0 rtmask 32 8 0 7 2 1 1 1 0 8 0 uvmvnodes 80 3334 0 0 69 0 69 69 0 8 0 vnodes 216 3334 0 0 186 0 186 186 0 8 0 namei 1024 14113 0 14111 4 3 1 2 0 8 0 percpumem 16 99 0 50 1 0 1 1 0 8 0 kstatmem 264 86 0 62 2 0 2 2 0 8 0 scsiplug 72 4 0 4 1 1 0 1 0 8 0 scxspl 216 19955 0 19954 11 10 1 8 1 8 0 plimitpl 152 162 0 145 1 0 1 1 0 8 0 sigapl 424 1199 0 1144 7 0 7 7 0 8 0 knotepl 120 336 0 0 11 0 11 11 0 8 0 kqueuepl 224 413 0 368 7 4 3 3 0 8 0 pipepl 344 206 0 179 6 0 6 6 0 8 3 fdescpl 528 1166 0 1135 3 0 3 3 0 8 0 filepl 160 6778 0 6520 23 9 14 19 0 8 3 lockfpl 104 333 0 331 1 0 1 1 0 8 0 lockfspl 48 157 0 155 1 0 1 1 0 8 0 sessionpl 144 26 0 17 1 0 1 1 0 8 0 pgrppl 48 51 0 34 1 0 1 1 0 8 0 ucredpl 104 976 0 959 1 0 1 1 0 8 0 zombiepl 144 1183 0 1181 1 0 1 1 0 8 0 processpl 1232 1199 0 1144 5 0 5 5 0 8 0 procpl 664 2457 0 2392 7 0 7 7 0 8 0 sosppl 168 3 0 3 1 1 0 1 0 8 0 sockpl 752 1806 0 1776 18 13 5 17 0 8 1 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 7 0 0 1 0 1 1 0 8 0 mcl12k 12288 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 111 0 0 14 0 14 14 0 8 0 mcl2k 2048 34 0 0 4 0 4 4 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 4515 0 0 282 0 282 282 0 8 0 bufpl 280 7531 0 1388 439 0 439 439 0 8 0 anonpl 32 8742 0 0 71 0 71 71 0 246 0 amapchunkpl 152 34388 0 33895 41 14 27 37 0 158 5 amappl16 200 3547 0 3514 24 10 14 15 0 8 8 amappl15 192 10 0 9 1 0 1 1 0 8 0 amappl14 184 125 0 113 1 0 1 1 0 8 0 amappl13 176 9 0 8 2 1 1 1 0 8 0 amappl12 168 1860 0 1830 4 2 2 3 0 8 0 amappl11 160 70 0 56 1 0 1 1 0 8 0 amappl10 152 78 0 78 1 1 0 1 0 8 0 amappl9 144 254 0 254 1 1 0 1 0 8 0 amappl8 136 27 0 25 1 0 1 1 0 8 0 amappl7 128 127 0 115 1 0 1 1 0 8 0 amappl6 120 216 0 213 1 0 1 1 0 8 0 amappl5 112 128 0 118 1 0 1 1 0 8 0 amappl4 104 319 0 296 1 0 1 1 0 8 0 amappl3 96 5556 0 5459 4 1 3 3 0 8 0 amappl2 88 1425 0 1348 2 0 2 2 0 8 0 amappl1 80 11903 0 11299 15 0 15 15 0 8 0 amappl 88 8930 0 8761 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 7 0 7 2 2 0 1 0 8 0 dma128 128 254 0 254 2 2 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 21 0 3 1 0 1 1 0 8 0 uaddrrnd 24 1166 0 1135 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1166 0 1135 1 0 1 1 0 8 0 vmmpekpl 168 10897 0 10847 3 0 3 3 0 8 0 vmmpepl 168 78764 0 76772 107 5 102 102 0 357 6 vmsppl 488 1165 0 1135 6 1 5 5 0 8 0 rwobjpl 80 25957 0 21657 91 0 91 91 0 8 0 pdppl 4096 2340 0 2270 108 36 72 84 0 8 2 pvpl 32 16690 0 0 135 0 135 135 0 265 0 pmappl 256 1165 0 1135 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 561 0 57 15 0 15 15 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff837cbff0) 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(ffffffff838ad0b0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838ad0b0) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80003c469af0,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7934097866f0, count: -6 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> trace sys_semop(ffff800033409a10,ffff80003c4a7460,ffff80003c4a73b0) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80003c4a7460) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4a7460) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb9989ecc700, count: -3