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(ffff8000ffff22a8,ffff80003c4acfc0,ffff80003c4acf10) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80003c4acfc0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4acfc0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x10002d47a890, count: -3 ddb{1}> show registers rdi 0 rsi 0xb rbp 0xffff80003c4acee0 rbx 0xdeaf4152deaf4152 rdx 0 rcx 0xffff8000ffff22a8 rax 0xffff8000299edff0 r8 0x7f7fffffc000 r9 0x1 r10 0x86fc0db78b22704f r11 0xff2efed06b00248f r12 0xb r13 0xfffffd806b6fbaf0 r14 0xffff80003c4acfc0 r15 0xb rip 0xffffffff81682fb2 sys_semop+0x352 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c4acdf0 ss 0x10 sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> show proc PROC (syz-executor) tid=192484 pid=49270 tcnt=5 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2c2a80,0xffff8000ffff34e0 process=0xffff800034c25360 user=0xffff80003c4a8000, vmspace=0xfffffd805d9915e0 estcpu=0, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 49270 443209 75742 0 7 0 syz-executor 49270 209569 75742 0 3 0x4000080 rest syz-executor *49270 192484 75742 0 7 0x4000000 syz-executor 49270 304716 75742 0 3 0x4000080 fsleep syz-executor 49270 157399 75742 0 2 0x4000000 syz-executor 43428 483138 6764 0 3 0x80 fsleep syz-executor 43428 211560 6764 0 3 0x4000080 kqread syz-executor 80284 365538 38928 0 3 0x80 fsleep syz-executor 80284 26955 38928 0 3 0x4000080 sbwait syz-executor 31913 505016 2860 0 3 0x80 fsleep syz-executor 31913 484732 2860 0 3 0x4000080 kqsel syz-executor 31913 239748 2860 0 3 0x4000080 fsleep syz-executor 31913 505266 2860 0 3 0x4000080 fsleep syz-executor 9112 465743 84294 0 3 0x80 fsleep syz-executor 9112 477959 84294 0 3 0x4000080 kqread syz-executor 9112 190994 84294 0 3 0x4000080 fsleep syz-executor 85647 433845 51994 0 3 0x80 fsleep syz-executor 85647 6502 51994 0 3 0x4000080 fifor syz-executor 43386 414800 97443 0 3 0x80 fsleep syz-executor 43386 495715 97443 0 3 0x4000080 kqread syz-executor 43386 245044 97443 0 3 0x4000080 fsleep syz-executor 63457 297018 3929 0 3 0x80 fsleep syz-executor 63457 457012 3929 0 3 0x4000080 fsleep syz-executor 63457 448721 3929 0 3 0x4000000 inode syz-executor 63457 148010 3929 0 3 0x4000000 inode syz-executor 2860 262034 31805 0 3 0x82 nanoslp syz-executor 13996 329313 0 0 3 0x14200 bored sosplice 71771 250998 0 0 3 0x14200 acct acct 84294 507049 31805 0 3 0x82 nanoslp syz-executor 75742 207356 31805 0 3 0x82 nanoslp syz-executor 6764 214333 31805 0 3 0x82 nanoslp syz-executor 3929 328142 31805 0 3 0x82 wait syz-executor 38928 405395 31805 0 3 0x82 nanoslp syz-executor 51994 442790 31805 0 3 0x82 nanoslp syz-executor 97443 229171 31805 0 3 0x82 nanoslp syz-executor 31805 30158 80298 0 3 0x82 kqread syz-executor 80298 378841 51418 0 3 0x10008a sigsusp ksh 51418 339430 91067 0 3 0x98 kqread sshd-session 91067 150303 12979 0 3 0x92 kqread sshd-session 47180 487142 1 0 3 0x100083 ttyin getty 12979 297685 1 0 3 0x88 kqread sshd 8377 355615 87313 74 3 0x1100092 bpf pflogd 87313 515885 1 0 3 0x80 sbwait pflogd 81866 349780 59963 73 3 0x1100090 kqread syslogd 59963 312022 1 0 3 0x100082 sbwait syslogd 74705 167773 1 0 3 0x100080 kqread resolvd 16415 118421 23730 77 3 0x100092 kqread dhcpleased 67467 184548 23730 77 3 0x100092 kqread dhcpleased 23730 510116 1 0 3 0x80 kqread dhcpleased 67542 300230 0 0 3 0x14200 bored smr 52203 154868 0 0 3 0x14200 pgzero zerothread 44259 272701 0 0 3 0x14200 aiodoned aiodoned 75020 176194 0 0 3 0x14200 syncer update 37511 202604 0 0 3 0x14200 cleaner cleaner 23264 286373 0 0 3 0x14200 reaper reaper 53387 101534 0 0 3 0x14200 pgdaemon pagedaemon 55342 359108 0 0 3 0x14200 bored viomb 68827 491782 0 0 3 0x40014200 acpi0 acpi0 23514 368673 0 0 3 0x40014200 idle1 13505 50369 0 0 3 0x14200 bored softnet7 92929 501840 0 0 3 0x14200 bored softnet6 71679 239241 0 0 3 0x14200 bored softnet5 81379 402608 0 0 3 0x14200 bored softnet4 70084 21665 0 0 3 0x14200 bored softnet3 17561 230631 0 0 3 0x14200 bored softnet2 50453 378492 0 0 3 0x14200 bored softnet1 19214 359688 0 0 3 0x14200 bored softnet0 64039 285932 0 0 3 0x14200 bored systqmp 66374 480502 0 0 3 0x14200 bored systq 88401 456179 0 0 3 0x14200 tmoslp softclockmp 51445 53089 0 0 3 0x40014200 tmoslp softclock 29907 408832 0 0 3 0x40014200 idle0 1 476235 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 49270 (syz-executor) thread 0xffff8000ffff22a8 (192484) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839c88e8) #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:748 #5 Xsyscall+0x128 Process 63457 (syz-executor) thread 0xffff80003c447250 (448721) exclusive rrwlock inode r = 0 (0xfffffd8069cd1b48) #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:748 #9 Xsyscall+0x128 Process 63457 (syz-executor) thread 0xffff80003c447a18 (148010) exclusive rrwlock inode r = 0 (0xfffffd8069cd1c70) #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: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+0x16bd sys/ufs/ufs/ufs_lookup.c:573 #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 dorenameat+0x144 sys/kern/vfs_syscalls.c:3004 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #14 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10212 11039K 12481K 166960K 12319 0 pcb 17 13K 13K 166960K 103 0 rtable 210 8K 8K 166960K 339 0 pf 35 17K 67485K 166960K 76 0 ifaddr 44 7K 8K 166960K 66 0 ifgroup 55 2K 2K 166960K 86 0 sysctl 2 1K 9K 166960K 40 0 counters 68 36K 37K 166960K 108 0 ioctlops 0 0K 4K 166960K 1636 0 iov 1 8K 28K 166960K 30 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1429 90K 90K 166960K 1908 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 16 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 24 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 668 0 sigio 0 0K 0K 166960K 19 0 proc 72 115K 180K 166960K 609 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 50 0 in_multi 100 7K 7K 166960K 135 0 ether_multi 1 0K 0K 166960K 6 0 mrt 0 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 419 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 259 160K 177K 166960K 7719 0 UVM aobj 30 4K 4K 166960K 30 0 pinsyscall 43 86K 106K 166960K 1792 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 49 0 NDP 12 0K 2K 166960K 42 0 temp 54 8646K 8715K 166960K 36209 0 kqueue 18 27K 30K 166960K 117 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 67 0 64 1 0 1 1 0 8 0 rtentry 176 116 0 26 5 0 5 5 0 8 0 unpcb 144 434 0 407 8 6 2 6 0 8 1 syncache 336 5 0 5 2 1 1 1 0 8 1 tcpcb 736 118 0 114 1 0 1 1 0 8 0 arp 128 13 0 1 1 0 1 1 0 8 0 inpcb 328 527 0 519 8 6 2 7 0 8 1 nd6 144 22 0 3 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 1 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 17 0 17 2 1 1 1 0 8 1 pppxif 1504 1 0 1 1 1 0 1 0 8 0 pffrag 232 6 0 1 1 0 1 1 0 482 0 pffrnode 88 6 0 1 1 0 1 1 0 8 0 pffrent 40 9 0 4 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 49 0 17 1 0 1 1 0 8 0 pfstkey 128 50 0 18 2 0 2 2 0 8 0 pfstate 384 50 0 18 4 0 4 4 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 256 555 0 110 29 1 28 29 0 8 0 art_table 40 557 0 110 5 0 5 5 0 8 0 art_node 32 116 0 38 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 1 1 0 1 1 0 8 0 semapl 112 21 0 12 1 0 1 1 0 8 0 shmpl 112 27 0 0 1 0 1 1 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 2543 0 1034 95 0 95 95 0 8 0 ffsino 296 2543 0 1034 117 0 117 117 0 8 0 nchpl 144 3475 0 1781 63 0 63 63 0 8 0 rtmask 32 5 0 5 3 3 0 1 0 8 0 uvmvnodes 80 2977 0 0 61 0 61 61 0 8 0 vnodes 216 2977 0 0 166 0 166 166 0 8 0 namei 1024 11587 0 11584 3 2 1 2 0 8 0 percpumem 16 69 0 20 1 0 1 1 0 8 0 kstatmem 264 50 0 24 3 1 2 3 0 8 0 scsiplug 72 3 0 3 2 1 1 1 0 8 1 scxspl 216 20184 0 20184 10 9 1 8 1 8 1 plimitpl 152 233 0 216 1 0 1 1 0 8 0 sigapl 424 975 0 919 7 0 7 7 0 8 0 knotepl 120 701 0 0 22 0 22 22 0 8 0 kqueuepl 224 208 0 193 5 3 2 3 0 8 1 pipepl 344 154 0 127 3 0 3 3 0 8 0 fdescpl 528 951 0 919 3 0 3 3 0 8 0 filepl 160 5036 0 4810 21 7 14 17 0 8 4 lockfpl 104 271 0 269 1 0 1 1 0 8 0 lockfspl 48 122 0 120 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 40 0 23 1 0 1 1 0 8 0 ucredpl 104 628 0 615 1 0 1 1 0 8 0 zombiepl 144 1063 0 1063 2 1 1 1 0 8 1 processpl 1232 975 0 919 5 0 5 5 0 8 0 procpl 664 1878 0 1805 7 0 7 7 0 8 0 sockpl 752 1044 0 1006 24 19 5 20 0 8 0 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 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 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 29 0 0 4 0 4 4 0 8 0 mtagpl 96 10 0 0 1 0 1 1 0 8 0 mbufpl 256 196 0 0 12 0 12 12 0 8 0 bufpl 280 9408 0 3265 440 0 440 440 0 8 1 anonpl 32 11601 0 0 94 0 94 94 0 246 0 amapchunkpl 152 25467 0 24907 36 7 29 29 0 158 7 amappl16 200 4214 0 4180 56 41 15 27 0 8 8 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 122 0 110 1 0 1 1 0 8 0 amappl13 176 9 0 9 1 1 0 1 0 8 0 amappl12 168 1620 0 1588 4 1 3 3 0 8 0 amappl11 160 51 0 37 1 0 1 1 0 8 0 amappl10 152 4 0 4 1 1 0 1 0 8 0 amappl9 144 252 0 252 1 1 0 1 0 8 0 amappl8 136 19 0 16 1 0 1 1 0 8 0 amappl7 128 111 0 99 1 0 1 1 0 8 0 amappl6 120 188 0 185 1 0 1 1 0 8 0 amappl5 112 134 0 124 1 0 1 1 0 8 0 amappl4 104 318 0 297 1 0 1 1 0 8 0 amappl3 96 4813 0 4685 5 1 4 4 0 8 0 amappl2 88 738 0 674 2 0 2 2 0 8 0 amappl1 80 11096 0 10496 15 0 15 15 0 8 0 amappl 88 6932 0 6746 6 1 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 128 255 0 255 3 3 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 29 0 0 1 0 1 1 0 8 0 uaddrrnd 24 951 0 919 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 951 0 919 1 0 1 1 0 8 0 vmmpekpl 168 9103 0 9063 3 0 3 3 0 8 0 vmmpepl 168 66904 0 64859 118 10 108 109 0 357 8 vmsppl 488 950 0 919 6 1 5 5 0 8 0 rwobjpl 80 23740 0 19773 88 3 85 85 0 8 4 pdppl 4096 1910 0 1838 100 26 74 86 0 8 2 pvpl 32 19031 0 0 154 0 154 154 0 265 0 pmappl 256 950 0 919 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 275 0 32 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff837a7ff0) 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(ffffffff839c86e0) at __mp_lock+0x19e __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839c86e0) at __mp_lock+0x19e sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff839c86e0) at __mp_lock+0x19e __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839c86e0) at __mp_lock+0x19e sys/kern/kern_lock.c:165 syscall(ffff80003c49ba10) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003c49ba10) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x785d1c00ede0, count: -10 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> trace sys_semop(ffff8000ffff22a8,ffff80003c4acfc0,ffff80003c4acf10) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80003c4acfc0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4acfc0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x10002d47a890, count: -3