login: 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(ffff8000fffde7f0,ffff80003bc02e50,ffff80003bc02da0) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80003bc02e50) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bc02e50) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x49d6ae1e770, count: -3 ddb{1}> show registers rdi 0 rsi 0x2f2e __ALIGN_SIZE+0x1f2e rbp 0xffff80003bc02d70 rbx 0xdeafbeaddeafbead rdx 0 rcx 0xffff8000fffde7f0 rax 0xffff8000299edff0 r8 0x7f7fffffc000 r9 0xfffffd80097fb478 r10 0x548759790fa29190 r11 0x7bf24f05b9144fb1 r12 0x2f2e __ALIGN_SIZE+0x1f2e r13 0xfffffd8062cadee0 r14 0xffff80003bc02e50 r15 0x2f2e __ALIGN_SIZE+0x1f2e rip 0xffffffff82c2b5f2 sys_semop+0x352 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003bc02c80 ss 0x10 sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> show proc PROC (syz-executor) tid=13697 pid=7713 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=36, usrpri=86, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffdefb8,0xffff8000fffdea98 process=0xffff8000fffeb9d8 user=0xffff80003bbfd000, vmspace=0xfffffd806a92c9a8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 7713 113742 3057 0 3 0x80 nanoslp syz-executor * 7713 13697 3057 0 7 0x4000000 syz-executor 7713 269302 3057 0 2 0x4000000 syz-executor 7713 464458 3057 0 3 0x4000080 fsleep syz-executor 52136 400369 10773 0 3 0x80 nanoslp syz-executor 52136 452863 10773 0 3 0x4000080 msgwait syz-executor 52136 164945 10773 0 3 0x4000080 fsleep syz-executor 52136 361179 10773 0 3 0x4000080 fsleep syz-executor 28999 42759 96401 0 7 0 syz-executor 28999 82932 96401 0 3 0x4000080 fifow syz-executor 62128 86210 44796 0 3 0x80 nanoslp syz-executor 62128 10501 44796 0 3 0x4000000 smrbar syz-executor 62128 497439 44796 0 3 0x4000080 fsleep syz-executor 89606 122152 46989 0 3 0x80 nanoslp syz-executor 89606 224604 46989 0 3 0x4000080 msgwait syz-executor 89606 52476 46989 0 3 0x4000080 fsleep syz-executor 7353 290264 15000 0 3 0x80 nanoslp syz-executor 7353 41438 15000 0 3 0x4000080 sbwait syz-executor 7353 98457 15000 0 3 0x4000080 fsleep syz-executor 3057 195991 38588 0 3 0x82 nanoslp syz-executor 35820 276901 38588 0 3 0x2 biowait syz-executor 46989 136158 38588 0 3 0x82 nanoslp syz-executor 73830 172529 38588 0 3 0x82 nanoslp syz-executor 44796 232304 38588 0 3 0x82 nanoslp syz-executor 10773 347901 38588 0 3 0x82 nanoslp syz-executor 15000 443359 38588 0 3 0x82 nanoslp syz-executor 96401 106353 38588 0 3 0x82 nanoslp syz-executor 38588 403477 2504 0 3 0x82 kqread syz-executor 2504 84243 45678 0 3 0x10008a sigsusp ksh 45678 206980 37939 0 3 0x98 kqread sshd-session 37939 441574 16372 0 3 0x92 kqread sshd-session 84622 165094 1 0 3 0x100083 ttyopn getty 16372 98776 1 0 3 0x88 kqread sshd 8210 286249 2298 74 3 0x1100092 bpf pflogd 2298 491205 1 0 3 0x80 sbwait pflogd 17309 225424 53040 73 3 0x1100090 kqread syslogd 53040 382681 1 0 3 0x100082 sbwait syslogd 62663 280014 1 0 3 0x100080 kqread resolvd 99111 288665 98894 77 3 0x100092 kqread dhcpleased 51266 97477 98894 77 3 0x100092 kqread dhcpleased 98894 287326 1 0 3 0x80 kqread dhcpleased 87831 424860 0 0 3 0x14200 bored smr 99939 305977 0 0 2 0x14200 zerothread 44461 476181 0 0 3 0x14200 aiodoned aiodoned 56687 145739 0 0 3 0x14200 syncer update 83844 114331 0 0 3 0x14200 cleaner cleaner 18932 46158 0 0 3 0x14200 reaper reaper 4441 332018 0 0 3 0x14200 pgdaemon pagedaemon 19161 224953 0 0 3 0x14200 bored viomb 95159 218348 0 0 3 0x40014200 acpi0 acpi0 10469 449403 0 0 3 0x40014200 idle1 35830 386436 0 0 3 0x14200 bored softnet1 28684 116786 0 0 3 0x14200 bored softnet0 38616 220895 0 0 3 0x14200 bored systqmp 56337 353109 0 0 3 0x14200 bored systq 23452 88387 0 0 3 0x14200 tmoslp softclockmp 86900 2646 0 0 3 0x40014200 tmoslp softclock 97120 268636 0 0 3 0x40014200 idle0 1 523678 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 7713 (syz-executor) thread 0xffff8000fffde7f0 (13697) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839b1420) #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_read+0x309 sys/kern/kern_rwlock.c:-1 #4 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1902 #5 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:699 #6 uvm_fault+0x106 sys/uvm/uvm_fault.c:633 #7 kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283 #8 kerntrap+0x19c sys/arch/amd64/amd64/trap.c:510 #9 alltraps_kern_meltdown+0x7b #10 _copyin+0x5b #11 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #12 Xsyscall+0x128 Process 62128 (syz-executor) thread 0xffff80002a270020 (10501) exclusive rwlock clonelk r = 0 (0xffffffff837e6678) #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 if_clone_destroy+0x67 sys/net/if.c:-1 #3 ifioctl+0x59d sys/net/if.c:2092 #4 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 #6 Xsyscall+0x128 Process 35820 (syz-executor) thread 0xffff8000fffef240 (276901) exclusive rrwlock inode r = 0 (0xfffffd8068e02338) #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:765 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806cdb4450) #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:765 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10216 11284K 11410K 166960K 11372 0 pcb 18 12K 12K 166960K 27 0 rtable 248 8K 8K 166960K 378 0 pf 37 18K 18K 166960K 59 0 ifaddr 44 7K 7K 166960K 53 0 ifgroup 57 2K 2K 166960K 70 0 sysctl 1 1K 9K 166960K 5 0 counters 72 37K 37K 166960K 84 0 ioctlops 0 0K 4K 166960K 1491 0 iov 0 0K 12K 166960K 1 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1345 85K 85K 166960K 1409 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 3 0K 0K 166960K 4 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 180 0 sigio 0 0K 0K 166960K 4 0 proc 71 115K 180K 166960K 535 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 2 0K 0K 166960K 9 0 in_multi 99 7K 7K 166960K 101 0 ether_multi 1 0K 0K 166960K 2 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 387 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 245 151K 162K 166960K 3610 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 42 84K 106K 166960K 1334 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 20 1K 2K 166960K 34 0 temp 37 8646K 8710K 166960K 4558 0 kqueue 16 26K 28K 166960K 31 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 39 0 35 1 0 1 1 0 8 0 rtentry 176 112 0 1 6 0 6 6 0 8 0 unpcb 144 50 0 28 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 20 0 14 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 101 0 90 2 0 2 2 0 8 0 nd6 152 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 7 0 5 1 0 1 1 0 8 0 pfstscr 40 2 0 2 1 0 1 1 0 8 1 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 17 0 0 1 0 1 1 0 8 0 pfstkey 128 18 0 1 1 0 1 1 0 8 0 pfstate 384 18 0 1 2 0 2 2 0 8 0 pfrule 1344 22 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 453 0 0 29 0 29 29 0 8 0 art_table 40 455 0 0 5 0 5 5 0 8 0 art_node 32 112 0 11 1 0 1 1 0 8 0 semapl 112 1 0 1 1 0 1 1 0 8 1 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1656 0 141 96 0 96 96 0 8 1 ffsino 296 1656 0 141 118 0 118 118 0 8 0 nchpl 144 1906 0 202 64 0 64 64 0 8 0 vnodes 216 1766 0 0 99 0 99 99 0 8 0 namei 1024 5737 0 5736 1 0 1 1 0 8 0 percpumem 16 57 0 6 1 0 1 1 0 8 0 kstatmem 264 38 0 10 3 0 3 3 0 8 0 scxspl 216 6154 0 6153 3 1 2 2 1 8 1 plimitpl 152 33 0 15 1 0 1 1 0 8 0 sigapl 424 497 0 450 7 0 7 7 0 8 1 knotepl 120 304 0 0 10 0 10 10 0 8 0 kqueuepl 224 36 0 24 1 0 1 1 0 8 0 pipepl 344 190 0 163 9 0 9 9 0 8 6 fdescpl 528 481 0 450 3 0 3 3 0 8 0 filepl 160 1865 0 1633 15 0 15 15 0 8 5 lockfpl 104 13 0 11 1 0 1 1 0 8 0 lockfspl 48 6 0 4 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 31 0 14 1 0 1 1 0 8 0 ucredpl 104 121 0 108 1 0 1 1 0 8 0 zombiepl 144 451 0 450 1 0 1 1 0 8 0 processpl 1232 497 0 450 5 0 5 5 0 8 1 procpl 664 580 0 520 6 0 6 6 0 8 0 sockpl 752 191 0 154 5 0 5 5 0 8 0 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 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 118 0 0 15 0 15 15 0 8 0 mcl2k 2048 35 0 0 5 0 5 5 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 175 0 0 11 0 11 11 0 8 0 bufpl 280 2384 0 130 161 0 161 161 0 8 0 anonpl 32 5465 0 0 45 0 45 45 0 246 0 amapchunkpl 152 10028 0 9531 27 0 27 27 0 158 5 amappl16 200 1847 0 1822 5 0 5 5 0 8 3 amappl15 192 6 0 6 1 0 1 1 0 8 1 amappl14 184 5 0 5 1 0 1 1 0 8 1 amappl13 176 435 0 434 1 0 1 1 0 8 0 amappl12 168 857 0 815 3 0 3 3 0 8 0 amappl11 160 8 0 8 1 0 1 1 0 8 1 amappl10 152 57 0 42 1 0 1 1 0 8 0 amappl9 144 248 0 248 1 0 1 1 0 8 1 amappl8 136 47 0 45 1 0 1 1 0 8 0 amappl7 128 96 0 95 1 0 1 1 0 8 0 amappl6 120 304 0 291 1 0 1 1 0 8 0 amappl5 112 94 0 84 1 0 1 1 0 8 0 amappl4 104 437 0 404 2 0 2 2 0 8 0 amappl3 96 1617 0 1525 3 0 3 3 0 8 0 amappl2 88 587 0 515 2 0 2 2 0 8 0 amappl1 80 9399 0 8807 14 0 14 14 0 8 0 amappl 88 2847 0 2677 5 0 5 5 0 92 0 uvmvnodes 80 1766 0 0 37 0 37 37 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 481 0 450 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 481 0 450 1 0 1 1 0 8 0 vmmpekpl 168 6053 0 6019 2 0 2 2 0 8 0 vmmpepl 168 38907 0 37001 86 0 86 86 0 357 0 vmsppl 488 480 0 450 5 0 5 5 0 8 1 rwobjpl 80 15675 0 12992 55 0 55 55 0 8 0 pdppl 4096 970 0 900 104 24 80 86 0 8 10 pvpl 32 12412 0 0 102 1 101 101 0 265 0 pmappl 256 480 0 450 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 277 0 26 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(ffffffff83862ff0) 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(ffffffff839b1218) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839b1218) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff800033bd8060,ffff80000007aa80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff839b1218) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839b1218) at __mp_lock+0x192 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 end of kernel end trace frame: 0x74be77387320, count: -10 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> trace sys_semop(ffff8000fffde7f0,ffff80003bc02e50,ffff80003bc02da0) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80003bc02e50) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bc02e50) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x49d6ae1e770, count: -3