kernel: protection fault trap, code=0 Stopped at sys_semop+0x3d5: 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(ffff80003c459cb0,ffff80003bc33790,ffff80003bc336e0) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003bc33790) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bc33790) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc8df6d855c0, count: -3 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003bc336b0 rbx 0xdeadbeefdeadbeef rdx 0 rcx 0xffff80003c459cb0 rax 0xdeadbeefdeadbeef r8 0x7f7fffffc000 r9 0x1 r10 0x104862e714d5c2fb r11 0x64967f39227a8160 r12 0 r13 0xfffffd8065ed8b60 r14 0xffff80003bc33790 r15 0 rip 0xffffffff81683035 sys_semop+0x3d5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003bc335c0 ss 0x10 sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{1}> show proc PROC (syz-executor) tid=49303 pid=4434 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c458028,0xffff80003c4582d0 process=0xffff80003ac24020 user=0xffff80003bc2e000, vmspace=0xfffffd806b9ce200 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 27092 195595 97619 0 7 0 syz-executor 4434 98433 78003 0 3 0x80 fsleep syz-executor * 4434 49303 78003 0 7 0x4000000 syz-executor 4434 181172 78003 0 3 0x4000080 fsleep syz-executor 4434 57584 78003 0 2 0x4000000 syz-executor 3312 428785 73433 0 3 0x80 fsleep syz-executor 3312 37428 73433 0 3 0x4000080 lockf syz-executor 57787 72223 59726 0 3 0x80 fsleep syz-executor 57787 32818 59726 0 3 0x4000080 fsleep syz-executor 57787 442495 59726 0 2 0x4000000 syz-executor 57787 191482 59726 0 3 0x4000080 fsleep syz-executor 86257 3397 22723 60928 3 0x90 fsleep syz-executor 86257 73223 22723 60928 3 0x4000090 semwait syz-executor 74369 211970 21032 0 3 0x80 fsleep syz-executor 74369 177595 21032 0 3 0x4000080 lockf syz-executor 78003 11038 72568 0 3 0x82 nanoslp syz-executor 45448 370771 0 0 3 0x14200 bored sosplice 97619 265716 72568 0 3 0x82 nanoslp syz-executor 63118 32801 72568 0 3 0x82 wait syz-executor 26209 46364 72568 0 3 0x2 biowait syz-executor 21032 420322 72568 0 3 0x82 nanoslp syz-executor 73433 135461 72568 0 3 0x82 nanoslp syz-executor 22723 258309 72568 0 3 0x82 nanoslp syz-executor 59726 338088 72568 0 3 0x82 nanoslp syz-executor 72568 152725 82785 0 3 0x82 kqread syz-executor 82785 382988 60106 0 3 0x10008a sigsusp ksh 60106 136665 59266 0 3 0x98 kqread sshd-session 59266 76785 20312 0 3 0x92 kqread sshd-session 96077 90157 1 0 3 0x100083 ttyin getty 20312 347078 1 0 3 0x88 kqread sshd 52227 416246 26401 74 3 0x1100092 bpf pflogd 26401 362594 1 0 3 0x80 sbwait pflogd 55259 353255 67075 73 3 0x1100090 kqread syslogd 67075 295512 1 0 3 0x100082 sbwait syslogd 40361 230013 1 0 3 0x100080 kqread resolvd 90383 455252 6221 77 3 0x100092 kqread dhcpleased 79516 341091 6221 77 3 0x100092 kqread dhcpleased 6221 220604 1 0 3 0x80 kqread dhcpleased 97088 138708 0 0 3 0x14200 bored smr 85604 336129 0 0 2 0x14200 zerothread 16102 169362 0 0 3 0x14200 aiodoned aiodoned 90001 315889 0 0 3 0x14200 syncer update 41276 275676 0 0 3 0x14200 cleaner cleaner 43434 219146 0 0 3 0x14200 reaper reaper 39766 84720 0 0 3 0x14200 pgdaemon pagedaemon 35653 221373 0 0 3 0x14200 bored viomb 20270 243095 0 0 3 0x40014200 acpi0 acpi0 89817 485765 0 0 3 0x40014200 idle1 7305 467479 0 0 3 0x14200 bored softnet7 75443 94571 0 0 3 0x14200 bored softnet6 42931 242698 0 0 3 0x14200 bored softnet5 71667 62794 0 0 3 0x14200 bored softnet4 55501 260647 0 0 3 0x14200 bored softnet3 86708 245998 0 0 3 0x14200 bored softnet2 93199 313010 0 0 3 0x14200 bored softnet1 30515 513266 0 0 3 0x14200 bored softnet0 12386 316316 0 0 3 0x14200 bored systqmp 39147 355335 0 0 3 0x14200 bored systq 47008 330715 0 0 3 0x14200 tmoslp softclockmp 92765 210888 0 0 3 0x40014200 tmoslp softclock 69136 172805 0 0 3 0x40014200 idle0 1 467947 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 27092 (syz-executor) thread 0xffff800033408d18 (195595) exclusive rwlock uobjlk r = 0 (0xfffffd806c567508) #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 uvm_fault_lower_lookup+0x53 sys/uvm/uvm_fault.c:1236 #3 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1370 #4 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 #7 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806b9ceaa0) #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:1924 #3 uvm_fault_check+0x4a sys/uvm/uvm_fault.c:741 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 #7 recall_trap+0x8 Process 4434 (syz-executor) thread 0xffff80003c459cb0 (49303) 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 26209 (syz-executor) thread 0xffff8000ffff27d8 (46364) exclusive rrwlock inode r = 0 (0xfffffd806b568b48) #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:748 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806ce0b698) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10209 11113K 11480K 166960K 11556 0 pcb 19 13K 13K 166960K 54 0 rtable 209 7K 7K 166960K 314 0 pf 35 17K 21K 166960K 76 0 ifaddr 41 7K 7K 166960K 62 0 ifgroup 55 2K 2K 166960K 88 0 sysctl 3 1K 9K 166960K 7 0 counters 68 36K 38K 166960K 98 0 ioctlops 0 0K 4K 166960K 1507 0 iov 0 0K 20K 166960K 10 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1350 85K 85K 166960K 1508 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 10 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 292 0 sigio 0 0K 0K 166960K 3 0 proc 72 115K 164K 166960K 591 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 14 0 in_multi 89 6K 7K 166960K 118 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 399 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 230 159K 168K 166960K 4369 0 UVM aobj 8 2K 2K 166960K 8 0 pinsyscall 42 84K 104K 166960K 1441 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 40 0 temp 42 8643K 8714K 166960K 11397 0 kqueue 13 20K 28K 166960K 46 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 46 0 43 1 0 1 1 0 8 0 rtentry 176 109 0 18 5 0 5 5 0 8 0 unpcb 144 127 0 107 2 0 2 2 0 8 1 syncache 336 4 0 4 2 1 1 1 0 8 1 tcpcb 736 58 0 52 2 1 1 2 0 8 0 arp 128 13 0 1 1 0 1 1 0 8 0 inpcb 328 222 0 208 4 1 3 3 0 8 1 nd6 144 18 0 4 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 11 0 11 1 0 1 1 0 8 1 pppxif 1504 2 0 2 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 1430 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1430 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 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 490 0 87 28 2 26 28 0 8 0 art_table 40 492 0 87 5 0 5 5 0 8 0 art_node 32 109 0 27 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 3 2 1 1 1 0 8 1 semapl 112 7 0 1 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 1855 0 339 95 0 95 95 0 8 0 ffsino 296 1855 0 339 117 0 117 117 0 8 0 nchpl 144 2253 0 557 64 0 64 64 0 8 0 uvmvnodes 80 2021 0 0 42 0 42 42 0 8 0 vnodes 216 2021 0 0 113 0 113 113 0 8 0 namei 1024 7156 0 7155 2 1 1 1 0 8 0 percpumem 16 64 0 15 1 0 1 1 0 8 0 kstatmem 264 46 0 20 3 0 3 3 0 8 0 scxspl 216 7768 0 7767 3 2 1 2 1 8 0 plimitpl 152 49 0 31 1 0 1 1 0 8 0 sigapl 424 606 0 552 7 0 7 7 0 8 0 knotepl 120 313 0 0 10 0 10 10 0 8 0 kqueuepl 224 69 0 57 2 0 2 2 0 8 1 pipepl 344 123 0 95 4 1 3 4 0 8 0 fdescpl 528 583 0 552 3 0 3 3 0 8 0 filepl 160 2491 0 2260 15 3 12 14 0 8 1 lockfpl 104 64 0 56 1 0 1 1 0 8 0 lockfspl 48 34 0 28 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 35 0 18 1 0 1 1 0 8 0 ucredpl 104 256 0 242 1 0 1 1 0 8 0 zombiepl 144 570 0 569 1 0 1 1 0 8 0 processpl 1232 606 0 552 5 0 5 5 0 8 0 procpl 664 861 0 798 6 0 6 6 0 8 0 sosppl 168 1 0 1 1 1 0 1 0 8 0 sockpl 752 403 0 366 7 0 7 7 0 8 2 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 15 0 15 15 0 8 0 mcl2k 2048 29 0 0 4 0 4 4 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 194 0 0 13 0 13 13 0 8 0 bufpl 280 3213 0 119 221 0 221 221 0 8 0 anonpl 32 5494 0 0 45 0 45 45 0 246 0 amapchunkpl 152 12885 0 12426 30 8 22 26 0 158 2 amappl16 200 1974 0 1948 6 3 3 5 0 8 0 amappl15 192 4 0 4 2 1 1 1 0 8 1 amappl14 184 121 0 109 1 0 1 1 0 8 0 amappl13 176 3 0 3 1 1 0 1 0 8 0 amappl12 168 1260 0 1230 3 1 2 2 0 8 0 amappl11 160 52 0 38 1 0 1 1 0 8 0 amappl10 152 35 0 35 1 1 0 1 0 8 0 amappl9 144 282 0 281 1 0 1 1 0 8 0 amappl8 136 22 0 20 1 0 1 1 0 8 0 amappl7 128 116 0 104 1 0 1 1 0 8 0 amappl6 120 230 0 227 1 0 1 1 0 8 0 amappl5 112 123 0 114 1 0 1 1 0 8 0 amappl4 104 308 0 287 1 0 1 1 0 8 0 amappl3 96 2276 0 2172 4 0 4 4 0 8 0 amappl2 88 672 0 612 2 0 2 2 0 8 0 amappl1 80 9305 0 8701 17 2 15 15 0 8 0 amappl 88 3620 0 3462 6 1 5 6 0 92 0 dma4096 4096 2 0 2 2 2 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 7 0 7 2 1 1 1 0 8 1 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 24 583 0 552 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 583 0 552 1 0 1 1 0 8 0 vmmpekpl 168 6399 0 6355 3 0 3 3 0 8 0 vmmpepl 168 43590 0 41636 95 1 94 94 0 357 2 vmsppl 488 582 0 552 5 0 5 5 0 8 0 rwobjpl 80 16601 0 13661 64 1 63 63 0 8 1 pdppl 4096 1174 0 1104 106 32 74 86 0 8 4 pvpl 32 11945 0 0 97 0 97 97 0 265 0 pmappl 256 582 0 552 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 281 0 40 7 0 7 7 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+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839c86e0) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff800033400da0,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f witness_checkorder(fffffd8069b2a510,9,0) at witness_checkorder+0x1eb sys/kern/subr_witness.c:1100 mtx_enter(fffffd8069b2a500) at mtx_enter+0x4a sys/kern/kern_lock.c:260 pmap_enter(fffffd8069b2a500,1a64154a000,6c470000,4,20) at pmap_enter+0x24b rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] pmap_enter(fffffd8069b2a500,1a64154a000,6c470000,4,20) at pmap_enter+0x24b pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline] pmap_enter(fffffd8069b2a500,1a64154a000,6c470000,4,20) at pmap_enter+0x24b sys/arch/amd64/amd64/pmap.c:2767 uvm_fault_lower_lookup(ffff800033401240,ffff800033401278,ffff8000334011c0) at uvm_fault_lower_lookup+0x3d6 sys/uvm/uvm_fault.c:-1 uvm_fault_lower(ffff800033401240,ffff800033401278,ffff8000334011c0) at uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1370 uvm_fault(fffffd806b9ce9a0,1a64154b000,0,4) at uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff8000334013d0,1a64154b260) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff8000334013d0) at usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7294b5017cc0, count: -15 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{1}> trace sys_semop(ffff80003c459cb0,ffff80003bc33790,ffff80003bc336e0) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003bc33790) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bc33790) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc8df6d855c0, count: -3