login: kernel: protection fault trap, code=0 Stopped at sys_semop+0x384: movzwl 0(%rbx),%r15d ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace sys_semop(ffff80003c453780,ffff80003341b670,ffff80003341b5c0) at sys_semop+0x384 sys/kern/sysv_sem.c:604 syscall(ffff80003341b670) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003341b670) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa86b8f864f0, count: -3 ddb{0}> show registers rdi 0 rsi 0xb8b5 __ALIGN_SIZE+0xa8b5 rbp 0xffff80003341b590 rbx 0xdeaf4152deb20a26 rdx 0 rcx 0xffff80003c453780 rax 0xffffffff8380eff0 cpu_info_full_primary+0x1ff0 r8 0x7f7fffffc000 r9 0 r10 0x37015a15084679d7 r11 0xad04342708c662b6 r12 0xffffb8b5 r13 0xfffffd8065c53b60 r14 0xffff80003341b670 r15 0x3b67 __ALIGN_SIZE+0x2b67 rip 0xffffffff81e6fc74 sys_semop+0x384 cs 0x8 rflags 0x10282 __ALIGN_SIZE+0xf282 rsp 0xffff80003341b4a0 ss 0x10 sys_semop+0x384: movzwl 0(%rbx),%r15d ddb{0}> show proc PROC (syz-executor) tid=133717 pid=19740 tcnt=4 stat=onproc flags process=10 proc=4000000 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c452fb8,0xffff80003c453a28 process=0xffff800033c25d60 user=0xffff800033416000, vmspace=0xfffffd806b943d70 estcpu=32, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 19740 245279 75977 60929 2 0x10 syz-executor *19740 133717 75977 60929 7 0x4000010 syz-executor 19740 61760 75977 60929 3 0x4000090 fsleep syz-executor 19740 490088 75977 60929 3 0x4000090 fsleep syz-executor 34412 138005 56901 0 7 0 syz-executor 34412 401682 56901 0 2 0x4000000 syz-executor 7523 272626 93960 0 3 0x80 fsleep syz-executor 7523 520974 93960 0 3 0x4000080 kqsel syz-executor 62647 407228 5003 0 3 0x80 fsleep syz-executor 62647 489003 5003 0 3 0x4000080 ttyin syz-executor 15954 296012 11330 0 3 0x80 fsleep syz-executor 15954 295552 11330 0 3 0x4000080 kqsel syz-executor 24863 42840 93807 0 3 0x80 fsleep syz-executor 24863 283997 93807 0 3 0x4000080 kqread syz-executor 54358 53178 20231 0 3 0x80 fsleep syz-executor 54358 92160 20231 0 3 0x4000080 sbwait syz-executor 10742 174828 38614 0 3 0x80 fsleep syz-executor 10742 468970 38614 0 3 0x4000080 bpf syz-executor 10742 289238 38614 0 3 0x4000080 fsleep syz-executor 73542 520714 1 0 3 0x100083 ttyin getty 47148 190474 0 0 3 0x14200 bored sosplice 56901 347457 10166 0 3 0x82 nanoslp syz-executor 20231 304672 10166 0 3 0x82 nanoslp syz-executor 38614 472737 10166 0 3 0x82 nanoslp syz-executor 5003 220960 10166 0 3 0x82 nanoslp syz-executor 75977 324757 10166 0 3 0x82 nanoslp syz-executor 93807 330462 10166 0 3 0x82 nanoslp syz-executor 93960 297328 10166 0 3 0x82 nanoslp syz-executor 11330 457251 10166 0 3 0x82 nanoslp syz-executor 10166 244472 38008 0 3 0x82 kqread syz-executor 38008 340303 35642 0 3 0x10008a sigsusp ksh 35642 160330 26798 0 3 0x98 kqread sshd-session 26798 242187 10195 0 3 0x92 kqread sshd-session 10195 43841 1 0 3 0x88 kqread sshd 75102 445174 99416 74 3 0x1100092 bpf pflogd 99416 25922 1 0 3 0x80 sbwait pflogd 83777 426990 49969 73 3 0x1100090 kqread syslogd 49969 159323 1 0 3 0x100082 sbwait syslogd 22328 46726 1 0 3 0x100080 kqread resolvd 2025 337583 79222 77 3 0x100092 kqread dhcpleased 3296 147767 79222 77 3 0x100092 kqread dhcpleased 79222 117528 1 0 3 0x80 kqread dhcpleased 31825 94925 0 0 3 0x14200 bored smr 82481 63644 0 0 3 0x14200 pgzero zerothread 42432 164070 0 0 3 0x14200 aiodoned aiodoned 15482 479129 0 0 3 0x14200 syncer update 25866 287076 0 0 3 0x14200 cleaner cleaner 78312 198596 0 0 3 0x14200 reaper reaper 8188 498801 0 0 3 0x14200 pgdaemon pagedaemon 19031 332872 0 0 3 0x14200 bored viomb 56495 29144 0 0 3 0x40014200 acpi0 acpi0 17490 293340 0 0 3 0x40014200 idle1 91755 67576 0 0 3 0x14200 bored softnet7 79534 27601 0 0 3 0x14200 bored softnet6 65856 520687 0 0 3 0x14200 bored softnet5 80001 339891 0 0 3 0x14200 bored softnet4 47789 350702 0 0 3 0x14200 bored softnet3 33557 145797 0 0 3 0x14200 bored softnet2 14578 364115 0 0 3 0x14200 bored softnet1 83016 378576 0 0 2 0x14200 softnet0 54411 413688 0 0 3 0x14200 bored systqmp 3760 448583 0 0 3 0x14200 bored systq 84489 453247 0 0 3 0x14200 tmoslp softclockmp 77156 205829 0 0 3 0x40014200 tmoslp softclock 18337 398568 0 0 3 0x40014200 idle0 1 354816 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 19740 (syz-executor) thread 0xffff80003c453780 (133717) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839ca180) #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 34412 (syz-executor) thread 0xffff80003c452028 (138005) exclusive rwlock uobjlk r = 0 (0xfffffd806b6f29a0) #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+0x1e5 sys/uvm/uvm_fault.c:699 #3 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #4 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806ef84c78) #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 54358 (syz-executor) thread 0xffff8000ffff2540 (92160) exclusive rwlock sbufrcv r = 0 (0xffff800001424100) #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 sblock+0xb6 sys/kern/uipc_socket2.c:536 #3 soreceive+0x27d sys/kern/uipc_socket.c:870 #4 recvit+0x40b sys/kern/uipc_syscalls.c:1078 #5 sys_recvmmsg+0x410 sys/kern/uipc_syscalls.c:969 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 #7 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10233 11100K 11237K 166960K 11530 0 pcb 17 12K 12K 166960K 56 0 rtable 199 7K 7K 166960K 295 0 pf 37 18K 22K 166960K 65 0 ifaddr 44 7K 8K 166960K 54 0 ifgroup 55 2K 2K 166960K 65 0 sysctl 3 1K 9K 166960K 9 0 counters 68 36K 37K 166960K 84 0 ioctlops 0 0K 4K 166960K 1515 0 iov 1 4K 16K 166960K 10 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1406 88K 89K 166960K 1542 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 8 0K 0K 166960K 45 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 308 0 sigio 0 0K 0K 166960K 7 0 proc 72 115K 180K 166960K 565 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 19 0 in_multi 99 7K 7K 166960K 111 0 ether_multi 1 0K 0K 166960K 5 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 211 943K 943K 166960K 211 0 exec 0 0K 1K 166960K 383 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 249 168K 182K 166960K 4369 0 UVM aobj 6 2K 2K 166960K 6 0 pinsyscall 43 86K 102K 166960K 1405 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 14 0 NDP 12 0K 2K 166960K 33 0 temp 46 8643K 8708K 166960K 19081 0 kqueue 14 20K 28K 166960K 51 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 42 0 39 1 0 1 1 0 8 0 rtentry 176 104 0 18 5 0 5 5 0 8 0 unpcb 144 182 0 163 3 2 1 3 0 8 0 syncache 336 7 0 7 1 1 0 1 0 8 0 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 736 58 0 52 2 1 1 2 0 8 0 arp 128 11 0 0 1 0 1 1 0 8 0 inpcb 328 275 0 262 2 0 2 2 0 8 0 nd6 144 18 0 0 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 8 0 8 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 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pftag 88 3 0 0 1 0 1 1 0 8 0 pfstitem 24 30 0 0 1 0 1 1 0 8 0 pfstkey 128 30 0 0 1 0 1 1 0 8 0 pfstate 384 30 0 0 3 0 3 3 0 8 0 pfrule 1344 23 0 17 2 1 1 2 0 8 0 rttmr 136 2 0 2 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 507 0 76 30 1 29 30 0 8 0 art_table 40 508 0 76 5 0 5 5 0 8 0 art_node 32 102 0 27 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0 semapl 112 41 0 36 1 0 1 1 0 8 0 shmpl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1877 0 365 95 0 95 95 0 8 0 ffsino 296 1877 0 365 117 0 117 117 0 8 0 nchpl 144 2329 0 639 63 0 63 63 0 8 0 rtmask 32 2 0 2 1 1 0 1 0 8 0 uvmvnodes 80 2096 0 0 43 0 43 43 0 8 0 vnodes 216 2096 0 0 117 0 117 117 0 8 0 namei 1024 7593 0 7593 3 2 1 2 0 8 1 percpumem 16 57 0 8 1 0 1 1 0 8 0 kstatmem 264 36 0 10 3 1 2 3 0 8 0 scxspl 216 10239 0 10239 3 2 1 2 1 8 1 plimitpl 152 50 0 31 1 0 1 1 0 8 0 sigapl 424 615 0 560 7 0 7 7 0 8 0 knotepl 120 523 0 0 16 0 16 16 0 8 0 kqueuepl 224 139 0 127 5 4 1 5 0 8 0 pipepl 344 122 0 95 3 0 3 3 0 8 0 fdescpl 528 592 0 560 3 0 3 3 0 8 0 filepl 160 2869 0 2646 16 6 10 16 0 8 0 lockfpl 104 227 0 225 2 1 1 2 0 8 0 lockfspl 48 114 0 112 1 0 1 1 0 8 0 sessionpl 144 26 0 17 1 0 1 1 0 8 0 pgrppl 48 37 0 20 1 0 1 1 0 8 0 ucredpl 104 407 0 392 1 0 1 1 0 8 0 zombiepl 144 567 0 567 2 1 1 1 0 8 1 processpl 1248 615 0 560 5 0 5 5 0 8 0 procpl 664 888 0 822 6 0 6 6 0 8 0 sockpl 752 504 0 469 7 3 4 7 0 8 0 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 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 114 0 0 15 0 15 15 0 8 0 mcl2k 2048 22 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 141 0 0 9 0 9 9 0 8 0 bufpl 280 4409 0 124 307 0 307 307 0 8 0 anonpl 32 11740 0 0 95 0 95 95 0 246 0 amapchunkpl 152 13788 0 13263 35 11 24 32 0 158 1 amappl16 200 2557 0 2523 19 14 5 19 0 8 0 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 117 0 105 1 0 1 1 0 8 0 amappl13 176 5 0 5 1 1 0 1 0 8 0 amappl12 168 1235 0 1203 3 1 2 2 0 8 0 amappl11 160 49 0 35 1 0 1 1 0 8 0 amappl10 152 9 0 9 2 2 0 1 0 8 0 amappl9 144 309 0 308 1 0 1 1 0 8 0 amappl8 136 27 0 25 1 0 1 1 0 8 0 amappl7 128 108 0 96 1 0 1 1 0 8 0 amappl6 120 189 0 185 1 0 1 1 0 8 0 amappl5 112 140 0 131 1 0 1 1 0 8 0 amappl4 104 310 0 291 1 0 1 1 0 8 0 amappl3 96 2407 0 2286 4 1 3 4 0 8 0 amappl2 88 654 0 592 2 0 2 2 0 8 0 amappl1 80 9653 0 9049 15 0 15 15 0 8 0 amappl 88 3649 0 3473 5 1 4 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 5 0 0 1 0 1 1 0 8 0 uaddrrnd 24 592 0 560 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 592 0 560 1 0 1 1 0 8 0 vmmpekpl 168 6570 0 6535 2 0 2 2 0 8 0 vmmpepl 168 45142 0 43110 102 8 94 102 0 357 0 vmsppl 488 591 0 560 5 0 5 5 0 8 0 rwobjpl 80 17550 0 14504 64 1 63 64 0 8 0 pdppl 4096 1191 0 1120 99 28 71 85 0 8 0 pvpl 32 19483 0 0 159 1 158 159 0 265 0 pmappl 256 591 0 560 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 270 0 35 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace sys_semop(ffff80003c453780,ffff80003341b670,ffff80003341b5c0) at sys_semop+0x384 sys/kern/sysv_sem.c:604 syscall(ffff80003341b670) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003341b670) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa86b8f864f0, count: -3 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299edff0) 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(ffffffff839c9f78) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839c9f78) at __mp_lock+0x192 sys/kern/kern_lock.c:165 uvm_fault(fffffd806ef84b78,61054e36000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:700 upageflttrap(ffff80003c451680,61054e36000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c451680) at usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x6f9fa83f0840, count: -8