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(ffff80003c4be038,ffff80003c4571c0,ffff80003c457110) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003c4571c0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4571c0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xaf027d011c0, count: -3 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c4570e0 rbx 0xdeafbeaddeafbead rdx 0 rcx 0xffff80003c4be038 rax 0xdeafbeaddeafbead r8 0x7f7fffffc000 r9 0x1 r10 0xd30d976789bcf889 r11 0x7aae5fca6a09374f r12 0 r13 0xfffffd806c325700 r14 0xffff80003c4571c0 r15 0 rip 0xffffffff8268fa15 sys_semop+0x3d5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c456ff0 ss 0x10 sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{1}> show proc PROC (syz-executor) tid=241521 pid=41133 tcnt=4 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=0xffff80003c4bed30,0xffff80003c4befd8 process=0xffff80003c4c26a8 user=0xffff80003c452000, vmspace=0xfffffd8067554d80 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 12727 474105 74584 0 2 0 syz-executor 12727 215553 74584 0 3 0x4000080 fsleep syz-executor 31405 10338 69080 0 7 0 syz-executor 31405 330919 69080 0 2 0x4000000 syz-executor 41133 81244 93724 0 2 0 syz-executor *41133 241521 93724 0 7 0x4000000 syz-executor 41133 452399 93724 0 3 0x4000080 fsleep syz-executor 41133 188707 93724 0 3 0x4000080 fsleep syz-executor 49962 472070 49570 0 2 0 syz-executor 49962 479156 49570 0 3 0x4000000 biowait syz-executor 49962 147679 49570 0 2 0x4000000 syz-executor 39714 492263 57494 0 3 0x80 nanoslp syz-executor 39714 368926 57494 0 3 0x4000080 ttyout syz-executor 39714 55322 57494 0 3 0x4000080 fsleep syz-executor 39714 516204 57494 0 3 0x4000080 fsleep syz-executor 92319 58808 53493 0 3 0x3000 suspend syz-executor 92319 220267 53493 0 3 0x4081000 biowait syz-executor 92319 517759 53493 0 3 0x4081000 fltagain2 syz-executor 92319 5169 53493 0 3 0x4081000 pipecl syz-executor 32983 28164 17576 0 3 0x3000 suspend syz-executor 32983 218070 17576 0 2 0x4081000 syz-executor 36792 33736 1 0 3 0x100083 ttyopn getty 79644 319429 82949 0 3 0x82 wait syz-executor 57494 14784 82949 0 3 0x82 nanoslp syz-executor 74584 432562 82949 0 3 0x82 nanoslp syz-executor 53493 144727 82949 0 3 0x82 wait syz-executor 93724 90014 82949 0 3 0x82 nanoslp syz-executor 69080 318545 82949 0 3 0x82 nanoslp syz-executor 17576 173200 82949 0 3 0x82 wait syz-executor 49570 258892 82949 0 3 0x82 nanoslp syz-executor 82949 243608 78431 0 3 0x82 kqread syz-executor 78431 315047 93231 0 3 0x10008a sigsusp ksh 93231 396772 27332 0 3 0x98 kqread sshd-session 27332 1038 89315 0 3 0x92 kqread sshd-session 89315 103221 1 0 3 0x88 kqread sshd 52012 329241 50695 74 3 0x1100092 bpf pflogd 50695 487726 1 0 3 0x80 sbwait pflogd 39984 508635 2792 73 3 0x1100090 kqread syslogd 2792 97843 1 0 3 0x100082 sbwait syslogd 42671 450032 1 0 3 0x100080 kqread resolvd 23967 438453 23457 77 3 0x100092 kqread dhcpleased 32498 392197 23457 77 3 0x100092 kqread dhcpleased 23457 432353 1 0 3 0x80 kqread dhcpleased 18178 69121 0 0 3 0x14200 bored smr 19979 261520 0 0 3 0x14200 pgzero zerothread 49235 313761 0 0 3 0x14200 aiodoned aiodoned 15889 414370 0 0 3 0x14200 syncer update 34679 267075 0 0 3 0x14200 cleaner cleaner 41063 7589 0 0 3 0x14200 reaper reaper 38960 294718 0 0 3 0x14200 pgdaemon pagedaemon 2790 271019 0 0 3 0x14200 bored viomb 7411 270215 0 0 3 0x40014200 acpi0 acpi0 22799 182406 0 0 3 0x40014200 idle1 15212 215977 0 0 3 0x14200 bored softnet1 83249 262854 0 0 3 0x14200 bored softnet0 79607 221179 0 0 3 0x14200 bored systqmp 64659 77919 0 0 3 0x14200 bored systq 77135 2548 0 0 3 0x14200 tmoslp softclockmp 26370 399579 0 0 3 0x40014200 tmoslp softclock 30893 117291 0 0 3 0x40014200 idle0 1 196093 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 41133 (syz-executor) thread 0xffff80003c4be038 (241521) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838b4448) #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:175 #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:775 #5 Xsyscall+0x128 Process 49962 (syz-executor) thread 0xffff80003c4bfcc0 (479156) exclusive rrwlock inode r = 0 (0xfffffd800e3c6b50) #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 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 92319 (syz-executor) thread 0xffff8000fffee548 (220267) exclusive rrwlock inode r = 0 (0xfffffd800e3c66b0) #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 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 32983 (syz-executor) thread 0xffff800032feafc0 (218070) exclusive rrwlock inode r = 0 (0xfffffd800e3c6da0) #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 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10208 11036K 11626K 166960K 13504 0 pcb 17 13K 20K 166960K 361 0 rtable 250 11K 12K 166960K 528 0 pf 34 17K 81K 166960K 167 0 ifaddr 41 7K 9K 166960K 100 0 ifgroup 51 2K 2K 166960K 177 0 sysctl 4 1K 9K 166960K 16 0 counters 68 36K 38K 166960K 204 0 ioctlops 0 0K 4K 166960K 1908 0 iov 0 0K 16K 166960K 104 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1495 94K 94K 166960K 2799 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 13 136K 136K 166960K 125 0 dirhash 12 2K 2K 166960K 33 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 1366 0 sigio 0 0K 0K 166960K 21 0 proc 73 115K 164K 166960K 689 0 subproc 72 4K 4K 166960K 137 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 246 0 in_multi 88 6K 7K 166960K 149 0 ether_multi 1 0K 0K 166960K 19 0 mrt 1 0K 0K 166960K 14 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 115 519K 519K 166960K 115 0 exec 0 0K 1K 166960K 780 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 273 166K 180K 166960K 14891 0 UVM aobj 58 12K 12K 166960K 65 0 pinsyscall 43 86K 104K 166960K 2517 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 139 0 NDP 11 0K 2K 166960K 72 0 temp 82 8680K 8751K 166960K 79332 0 kqueue 13 20K 30K 166960K 253 0 SYN cache 2 8K 16K 166960K 3 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 120 227 0 224 4 2 2 3 0 8 1 rtentry 176 150 0 45 6 0 6 6 0 8 0 unpcb 144 955 0 937 10 9 1 4 0 8 0 syncache 336 8 0 8 4 3 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 633 0 628 13 12 1 7 0 8 0 arp 136 25 0 6 1 0 1 1 0 8 0 inpcb 328 1697 0 1685 24 17 7 12 0 8 5 nd6 152 30 0 4 2 0 2 2 0 8 0 pkpcb 40 8 0 8 4 3 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 56 0 56 4 3 1 1 0 8 1 pppxif 1504 3 0 3 2 2 0 1 0 8 0 pffrag 232 19 0 4 1 0 1 1 0 482 0 pffrnode 88 18 0 4 1 0 1 1 0 8 0 pffrent 40 68 0 53 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 pfrktable 1344 1 0 1 1 1 0 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pfstitem 24 111 0 45 1 0 1 1 0 8 0 pfstkey 128 111 0 45 3 0 3 3 0 8 0 pfstate 448 109 0 45 8 0 8 8 0 8 0 pfrule 1344 27 0 22 2 1 1 2 0 8 0 rttmr 136 3 0 3 2 2 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 590 0 179 33 5 28 32 0 8 0 art_table 40 593 0 179 6 0 6 6 0 8 0 art_node 32 150 0 60 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 7 1 0 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 119 0 109 1 0 1 1 0 8 0 shmpl 112 56 0 5 2 0 2 2 0 8 0 dirhash 1024 32 0 15 3 0 3 3 0 8 0 dino2pl 256 4049 0 2545 96 0 96 96 0 8 0 ffsino 296 4049 0 2545 118 1 117 118 0 8 0 nchpl 144 6015 0 4308 64 0 64 64 0 8 0 rtmask 32 14 0 14 5 5 0 1 0 8 0 vnodes 216 4994 0 0 278 0 278 278 0 8 0 namei 1024 21339 0 21339 2 1 1 1 0 8 1 percpumem 16 117 0 68 1 0 1 1 0 8 0 vcpupl 3968 5 0 1 1 0 1 1 0 8 0 vmpool 840 6 0 2 1 0 1 1 0 8 0 kstatmem 264 112 0 88 6 4 2 3 0 8 0 scsiplug 72 10 0 10 4 3 1 1 0 8 1 scxspl 216 28309 0 28307 11 10 1 7 1 8 0 plimitpl 152 408 0 387 1 0 1 1 0 8 0 sigapl 424 1710 0 1662 8 1 7 8 0 8 0 knotepl 120 506 0 0 15 0 15 15 0 8 0 kqueuepl 224 534 0 525 8 3 5 5 0 8 4 pipepl 344 215 0 186 3 0 3 3 0 8 0 fdescpl 528 1664 0 1632 3 0 3 3 0 8 0 filepl 160 11335 0 11107 32 14 18 18 0 8 7 lockfpl 104 560 0 557 1 0 1 1 0 8 0 lockfspl 48 164 0 161 1 0 1 1 0 8 0 sessionpl 144 27 0 18 1 0 1 1 0 8 0 pgrppl 48 47 0 30 1 0 1 1 0 8 0 ucredpl 104 1845 0 1832 2 0 2 2 0 8 1 zombiepl 144 2207 0 2204 2 1 1 1 0 8 0 processpl 1232 1710 0 1662 6 1 5 6 0 8 0 procpl 664 3974 0 3912 8 2 6 8 0 8 0 sosppl 176 2 0 2 1 1 0 1 0 8 0 sockpl 752 2966 0 2933 34 23 11 17 0 8 6 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 130 0 0 17 0 17 17 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 75 0 0 9 1 8 8 0 8 0 mtagpl 96 121 0 0 3 0 3 3 0 8 0 mbufpl 256 1232 0 0 77 0 77 77 0 8 0 bufpl 280 10356 0 4218 439 0 439 439 0 8 0 anonpl 32 10954 0 0 88 0 88 88 0 246 0 amapchunkpl 152 49698 0 49114 58 28 30 30 0 158 7 amappl16 200 5929 0 5443 52 26 26 26 0 8 0 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 7 0 7 1 1 0 1 0 8 0 amappl13 176 449 0 448 1 0 1 1 0 8 0 amappl12 168 2052 0 2009 3 0 3 3 0 8 0 amappl11 160 11 0 11 1 1 0 1 0 8 0 amappl10 152 73 0 59 1 0 1 1 0 8 0 amappl9 144 356 0 354 1 0 1 1 0 8 0 amappl8 136 29 0 27 1 0 1 1 0 8 0 amappl7 128 87 0 85 1 0 1 1 0 8 0 amappl6 120 285 0 272 1 0 1 1 0 8 0 amappl5 112 100 0 89 1 0 1 1 0 8 0 amappl4 104 436 0 407 1 0 1 1 0 8 0 amappl3 96 8783 0 8675 4 1 3 3 0 8 0 amappl2 88 1807 0 1728 2 0 2 2 0 8 0 amappl1 80 15129 0 14524 16 1 15 15 0 8 0 amappl 88 13929 0 13737 6 1 5 5 0 92 0 uvmvnodes 80 136 0 0 3 0 3 3 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 7 0 7 2 1 1 1 0 8 1 dma128 128 258 0 258 3 2 1 1 0 8 1 dma64 64 7 0 7 2 2 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 64 0 7 2 0 2 2 0 8 0 uaddrrnd 24 1664 0 1632 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1664 0 1632 1 0 1 1 0 8 0 vmmpekpl 168 15016 0 14973 3 0 3 3 0 8 0 vmmpepl 168 112850 0 110365 126 17 109 109 0 357 0 vmsppl 488 1663 0 1632 6 1 5 5 0 8 0 rwobjpl 80 32116 0 30497 38 4 34 34 0 8 0 pdppl 4096 3347 0 3272 123 46 77 85 0 8 2 pvpl 32 17668 0 0 143 1 142 142 0 265 0 pmappl 256 1669 0 1634 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 399 0 71 10 0 10 10 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff83861ff0) 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(ffffffff838b4240) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838b4240) at __mp_lock+0x199 sys/kern/kern_lock.c:165 intr_handler(ffff80003b019ba0,ffff80000006b400) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7bb015dd3250, count: -6 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x3d5: movzwl 0(%rax),%r15d ddb{1}> trace sys_semop(ffff80003c4be038,ffff80003c4571c0,ffff80003c457110) at sys_semop+0x3d5 sys/kern/sysv_sem.c:617 syscall(ffff80003c4571c0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4571c0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xaf027d011c0, count: -3