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(ffff80002a2b6d18,ffff80003c477170,ffff80003c4770c0) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80003c477170) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c477170) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe1aa91d98e0, count: -3 ddb{1}> show registers rdi 0 rsi 0xb rbp 0xffff80003c477090 rbx 0xdead4110dead4110 rdx 0 rcx 0xffff80002a2b6d18 rax 0xffff8000299edff0 r8 0x7f7fffffc000 r9 0x1 r10 0xb861eddeb0a66206 r11 0xbbd4d20f180772ea r12 0xb r13 0xfffffd8067eba7e0 r14 0xffff80003c477170 r15 0xb rip 0xffffffff818443f2 sys_semop+0x352 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c476fa0 ss 0x10 sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> show proc PROC (syz-executor) tid=37379 pid=38463 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=76, usrpri=76, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2b6020,0xffff80003c458a98 process=0xffff80003bc25830 user=0xffff80003c472000, vmspace=0xfffffd805e745b98 estcpu=26, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 38463 100301 15766 0 2 0 syz-executor 38463 509069 15766 0 2 0x4000000 syz-executor *38463 37379 15766 0 7 0x4000000 syz-executor 38463 110725 15766 0 3 0x4000080 fsleep syz-executor 46424 322905 87428 0 3 0x80 fsleep syz-executor 46424 465248 87428 0 3 0x4000080 bell syz-executor 39506 273447 57287 -1 3 0x90 fsleep syz-executor 39506 79650 57287 -1 3 0x4000090 ttyout syz-executor 16027 155936 97429 0 3 0x80 fsleep syz-executor 16027 11531 97429 0 3 0x4000080 pipewr syz-executor 27856 413304 71635 0 3 0x80 fsleep syz-executor 27856 274225 71635 0 3 0x4000080 kqsel syz-executor 6171 439396 51201 0 3 0x80 fsleep syz-executor 6171 11727 51201 0 3 0x4000000 biowait syz-executor 66267 469163 43061 0 2 0x4081000 syz-executor 66267 516409 43061 0 3 0x4003000 suspend syz-executor 51201 394159 84907 0 3 0x82 nanoslp syz-executor 65590 53313 0 0 3 0x14200 bored sosplice 97429 256948 84907 0 2 0x3 syz-executor 43061 4655 84907 0 3 0x82 wait syz-executor 96872 461174 84907 0 3 0x82 nanoslp syz-executor 87428 161169 84907 0 2 0xc82 syz-executor 71635 414789 84907 0 3 0x82 nanoslp syz-executor 57287 470509 84907 0 3 0x82 nanoslp syz-executor 15766 362066 84907 0 3 0x82 nanoslp syz-executor 84907 442731 59605 0 7 0x2 syz-executor 59605 20545 63687 0 3 0x10008a sigsusp ksh 63687 324670 44409 0 3 0x98 kqread sshd-session 44409 261198 86161 0 3 0x92 kqread sshd-session 6066 228074 1 0 3 0x100083 ttyin getty 86161 182392 1 0 3 0x88 kqread sshd 410 57957 8149 74 3 0x1100092 bpf pflogd 8149 191122 1 0 3 0x80 sbwait pflogd 99399 425337 42941 73 3 0x1100090 kqread syslogd 42941 171901 1 0 3 0x100082 sbwait syslogd 84559 214889 1 0 3 0x100080 kqread resolvd 80507 487897 16131 77 3 0x100092 kqread dhcpleased 4681 207071 16131 77 3 0x100092 kqread dhcpleased 16131 455910 1 0 3 0x80 kqread dhcpleased 94188 245664 0 0 3 0x14200 bored smr 25238 287112 0 0 3 0x14200 pgzero zerothread 9728 38105 0 0 3 0x14200 aiodoned aiodoned 94017 475848 0 0 3 0x14200 syncer update 20803 34658 0 0 3 0x14200 cleaner cleaner 98034 158890 0 0 3 0x14200 reaper reaper 7599 59597 0 0 3 0x14200 pgdaemon pagedaemon 60665 27716 0 0 3 0x14200 bored viomb 71583 133687 0 0 3 0x40014200 acpi0 acpi0 39722 34958 0 0 3 0x40014200 idle1 39019 226130 0 0 3 0x14200 bored softnet7 29906 213582 0 0 3 0x14200 bored softnet6 78380 372575 0 0 3 0x14200 bored softnet5 81628 179206 0 0 3 0x14200 bored softnet4 95234 326648 0 0 3 0x14200 bored softnet3 50025 173600 0 0 3 0x14200 bored softnet2 32213 270412 0 0 3 0x14200 bored softnet1 38751 201788 0 0 3 0x14200 bored softnet0 53049 265636 0 0 3 0x14200 bored systqmp 38485 8202 0 0 3 0x14200 bored systq 69493 162691 0 0 3 0x14200 tmoslp softclockmp 81558 3086 0 0 3 0x40014200 tmoslp softclock 63552 413029 0 0 3 0x40014200 idle0 1 383999 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 38463 (syz-executor) thread 0xffff80002a2b6d18 (37379) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838c0f98) #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:746 #5 Xsyscall+0x128 Process 6171 (syz-executor) thread 0xffff80003c4587f0 (11727) exclusive rrwlock inode r = 0 (0xfffffd806e0b95c8) #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:746 #9 Xsyscall+0x128 Process 66267 (syz-executor) thread 0xffff80003c459a18 (469163) exclusive rrwlock inode r = 0 (0xfffffd806e1c6238) #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:746 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10214 11124K 12340K 166960K 12008 0 pcb 17 15K 17K 166960K 252 0 rtable 193 6K 7K 166960K 353 0 pf 35 17K 131089K 166960K 101 0 ifaddr 42 7K 8K 166960K 73 0 ifgroup 58 2K 2K 166960K 112 0 sysctl 4 1K 9K 166960K 12 0 counters 68 36K 37K 166960K 112 0 ioctlops 0 0K 4K 166960K 1557 0 iov 0 0K 12K 166960K 25 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1410 89K 89K 166960K 1788 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 8 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 17 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 639 0 sigio 0 0K 0K 166960K 9 0 proc 73 115K 180K 166960K 614 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 92 0 in_multi 89 6K 7K 166960K 143 0 ether_multi 1 0K 0K 166960K 8 0 mrt 1 0K 0K 166960K 4 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 434 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 254 160K 177K 166960K 7579 0 UVM aobj 10 2K 2K 166960K 13 0 pinsyscall 43 86K 102K 166960K 1783 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 47 0 NDP 12 0K 2K 166960K 47 0 temp 78 8652K 8724K 166960K 39340 0 kqueue 13 20K 31K 166960K 136 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 78 0 75 1 0 1 1 0 8 0 rtentry 176 122 0 39 5 0 5 5 0 8 0 unpcb 144 351 0 332 2 1 1 2 0 8 0 syncache 336 6 0 6 2 2 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 148 0 142 3 1 2 2 0 8 1 arp 128 15 0 3 1 0 1 1 0 8 0 inpcb 328 763 0 754 10 8 2 7 0 8 1 nd6 144 20 0 4 1 0 1 1 0 8 0 pkpcb 40 5 0 5 3 2 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 15 0 15 1 0 1 1 0 8 1 pppxif 1504 3 0 3 1 1 0 1 0 8 0 pffrag 232 3 0 1 1 0 1 1 0 482 0 pffrnode 88 3 0 1 1 0 1 1 0 8 0 pffrent 40 4 0 2 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 pftag 88 3 0 1 1 0 1 1 0 8 0 pfstitem 24 64 0 13 1 0 1 1 0 8 0 pfstkey 128 64 0 13 2 0 2 2 0 8 0 pfstate 384 63 0 12 6 0 6 6 0 8 0 pfrule 1344 26 0 20 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 593 0 221 30 6 24 30 0 8 0 art_table 40 595 0 221 5 0 5 5 0 8 0 art_node 32 122 0 54 1 0 1 1 0 8 0 sysvmsgpl 40 34 0 34 1 1 0 1 0 8 0 semapl 112 13 0 4 1 0 1 1 0 8 0 shmpl 112 10 0 3 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2532 0 1015 95 0 95 95 0 8 0 ffsino 296 2532 0 1015 117 0 117 117 0 8 0 nchpl 144 3456 0 1758 63 0 63 63 0 8 0 rtmask 32 2 0 2 1 1 0 1 0 8 0 uvmvnodes 80 2825 0 0 58 0 58 58 0 8 0 vnodes 216 2825 0 0 157 0 157 157 0 8 0 namei 1024 11363 0 11363 3 2 1 2 0 8 1 percpumem 16 71 0 22 1 0 1 1 0 8 0 kstatmem 264 60 0 34 3 1 2 3 0 8 0 scsiplug 72 5 0 5 2 1 1 1 0 8 1 scxspl 216 18338 0 18337 10 9 1 8 1 8 0 plimitpl 152 153 0 133 1 0 1 1 0 8 0 sigapl 424 952 0 897 7 0 7 7 0 8 0 knotepl 120 345 0 0 11 0 11 11 0 8 0 kqueuepl 224 206 0 196 3 1 2 2 0 8 1 pipepl 344 163 0 134 4 1 3 4 0 8 0 fdescpl 528 928 0 896 3 0 3 3 0 8 0 filepl 160 4995 0 4767 15 4 11 14 0 8 1 lockfpl 104 177 0 175 1 0 1 1 0 8 0 lockfspl 48 79 0 77 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 41 0 24 1 0 1 1 0 8 0 ucredpl 104 788 0 773 1 0 1 1 0 8 0 zombiepl 144 921 0 920 1 0 1 1 0 8 0 processpl 1232 952 0 897 5 0 5 5 0 8 0 procpl 664 1771 0 1706 7 1 6 7 0 8 0 sosppl 168 1 0 1 1 1 0 1 0 8 0 sockpl 752 1209 0 1178 14 9 5 11 0 8 1 mcl64k 65536 4 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 109 0 0 14 0 14 14 0 8 0 mcl2k 2048 21 0 0 3 0 3 3 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 186 0 0 12 0 12 12 0 8 0 bufpl 280 8616 0 2473 440 0 440 440 0 8 0 anonpl 32 10945 0 0 89 0 89 89 0 246 0 amapchunkpl 152 24318 0 23711 34 10 24 27 0 158 0 amappl16 200 3995 0 3584 38 16 22 22 0 8 0 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 120 0 108 1 0 1 1 0 8 0 amappl13 176 3 0 3 2 2 0 1 0 8 0 amappl12 168 1621 0 1589 4 1 3 3 0 8 0 amappl11 160 60 0 46 1 0 1 1 0 8 0 amappl10 152 9 0 9 1 1 0 1 0 8 0 amappl9 144 256 0 256 1 1 0 1 0 8 0 amappl8 136 24 0 21 1 0 1 1 0 8 0 amappl7 128 110 0 98 1 0 1 1 0 8 0 amappl6 120 199 0 196 1 0 1 1 0 8 0 amappl5 112 131 0 121 1 0 1 1 0 8 0 amappl4 104 328 0 306 1 0 1 1 0 8 0 amappl3 96 4663 0 4546 5 1 4 4 0 8 0 amappl2 88 672 0 611 2 0 2 2 0 8 0 amappl1 80 10903 0 10297 18 2 16 16 0 8 0 amappl 88 6761 0 6580 6 1 5 5 0 92 0 dma8192 8192 1 0 1 1 1 0 1 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 128 254 0 254 2 2 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 12 0 3 1 0 1 1 0 8 0 uaddrrnd 24 928 0 896 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 928 0 896 1 0 1 1 0 8 0 vmmpekpl 168 8958 0 8922 2 0 2 2 0 8 0 vmmpepl 168 65358 0 62926 115 9 106 110 0 357 0 vmsppl 488 927 0 896 6 2 4 5 0 8 0 rwobjpl 80 23191 0 19024 87 1 86 86 0 8 0 pdppl 4096 1863 0 1792 105 34 71 85 0 8 0 pvpl 32 18922 0 0 154 1 153 153 0 265 0 pmappl 256 927 0 896 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 281 0 48 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(ffffffff8385dff0) 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(ffffffff838c0d90) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838c0d90) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80002a30cef0,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f memset() at memset+0x7c kqueue_register(fffffd8076ed20e0,ffff80002a30d150,0,ffff80002a2a22b0) at kqueue_register+0x201 sys/kern/kern_event.c:1415 pselregister(ffff80002a2a22b0,ffff80002a30d400,0,35,ffff80002a30d484,ffff80002a30d540) at pselregister+0x135 sys/kern/sys_generic.c:760 dopselect(ffff80002a2a22b0,35,7c5214be8510,0,0,ffff80002a30d540,317ccd5b05ce1626,ffff80002a30d5e0) at dopselect+0x456 sys/kern/sys_generic.c:653 sys_pselect(ffff80002a2a22b0,ffff80002a30d690,ffff80002a30d5e0) at sys_pselect+0x25a sys/kern/sys_generic.c:589 syscall(ffff80002a30d690) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a30d690) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c5214be84c0, count: -13 ddb{0}> machine ddbcpu 1 Stopped at sys_semop+0x352: movzwl 0x8(%rbx),%r15d ddb{1}> trace sys_semop(ffff80002a2b6d18,ffff80003c477170,ffff80003c4770c0) at sys_semop+0x352 sys/kern/sysv_sem.c:622 syscall(ffff80003c477170) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c477170) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe1aa91d98e0, count: -3