login: witness: acquiring duplicate lock of same type: "&sc->sc_lock" 1st wsmuxlk @ /syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:245 2nd wsmuxlk @ /syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:245 Starting stack trace... witness_checkorder(ffff8000019869d0,1,ffffffff81f36129,f5,0) at witness_checkorder+0xe14 witness_debugger sys/kern/subr_witness.c:2650 [inline] witness_checkorder(ffff8000019869d0,1,ffffffff81f36129,f5,0) at witness_checkorder+0xe14 sys/kern/subr_witness.c:926 _rw_enter_read(ffff8000019869c0,ffffffff81f36129,f5) at _rw_enter_read+0x80 sys/kern/kern_rwlock.c:102 wsmux_mux_open(ffff800001986900,ffff800000026d50) at wsmux_mux_open+0x82 wsmux_do_open sys/dev/wscons/wsmux.c:246 [inline] wsmux_mux_open(ffff800001986900,ffff800000026d50) at wsmux_mux_open+0x82 sys/dev/wscons/wsmux.c:228 wsmuxopen(4500,1,2000,ffff800020b42978) at wsmuxopen+0x179 wsmux_do_open sys/dev/wscons/wsmux.c:258 [inline] wsmuxopen(4500,1,2000,ffff800020b42978) at wsmuxopen+0x179 sys/dev/wscons/wsmux.c:204 spec_open(ffff800020bfd130) at spec_open+0x217 sys/kern/spec_vnops.c:158 VOP_OPEN(fffffd806e6867e0,1,fffffd807f7c7a80,ffff800020b42978) at VOP_OPEN+0x76 sys/kern/vfs_vops.c:153 vn_open(ffff800020bfd320,1,0) at vn_open+0x4c6 sys/kern/vfs_vnops.c:174 doopenat(ffff800020b42978,ffffff9c,200001c0,0,0,ffff800020bfd560) at doopenat+0x2be sys/kern/vfs_syscalls.c:1045 syscall(ffff800020bfd610) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020bfd610) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffffa8,0,3,5dfece85010) at Xsyscall+0x128 end of kernel end trace frame: 0x5e2ba1a56e0, count: 247 End of stack trace. Stopped at db_enter+0x18: addq $0x8,%rsp ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 witness_checkorder(ffff8000019869d0,1,ffffffff81f36129,f5,0) at witness_checkorder+0xe19 witness_debugger sys/kern/subr_witness.c:2650 [inline] witness_checkorder(ffff8000019869d0,1,ffffffff81f36129,f5,0) at witness_checkorder+0xe19 sys/kern/subr_witness.c:926 _rw_enter_read(ffff8000019869c0,ffffffff81f36129,f5) at _rw_enter_read+0x80 sys/kern/kern_rwlock.c:102 wsmux_mux_open(ffff800001986900,ffff800000026d50) at wsmux_mux_open+0x82 wsmux_do_open sys/dev/wscons/wsmux.c:246 [inline] wsmux_mux_open(ffff800001986900,ffff800000026d50) at wsmux_mux_open+0x82 sys/dev/wscons/wsmux.c:228 wsmuxopen(4500,1,2000,ffff800020b42978) at wsmuxopen+0x179 wsmux_do_open sys/dev/wscons/wsmux.c:258 [inline] wsmuxopen(4500,1,2000,ffff800020b42978) at wsmuxopen+0x179 sys/dev/wscons/wsmux.c:204 spec_open(ffff800020bfd130) at spec_open+0x217 sys/kern/spec_vnops.c:158 VOP_OPEN(fffffd806e6867e0,1,fffffd807f7c7a80,ffff800020b42978) at VOP_OPEN+0x76 sys/kern/vfs_vops.c:153 vn_open(ffff800020bfd320,1,0) at vn_open+0x4c6 sys/kern/vfs_vnops.c:174 doopenat(ffff800020b42978,ffffff9c,200001c0,0,0,ffff800020bfd560) at doopenat+0x2be sys/kern/vfs_syscalls.c:1045 syscall(ffff800020bfd610) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020bfd610) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffffa8,0,3,5dfece85010) at Xsyscall+0x128 end of kernel end trace frame: 0x5e2ba1a56e0, count: -11 ddb{1}> show registers rdi 0 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020bfced0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800002b4a000 rax 0xffff800001947a40 r8 0xffffffff8155ffb3 kprintf+0x183 r9 0x1 r10 0x25 r11 0x82c01b8a0b5fbd7d r12 0xffffffff81f36129 substchar+0xb4b1 r13 0xf5 r14 0xffffffff81f25d3f apollo_udma33_tim+0x233d r15 0xffffffff81f36129 substchar+0xb4b1 rip 0xffffffff812c7448 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020bfcec0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=201773 stat=onproc flags process=0 proc=4000000 pri=79, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800020b424c8,0xffffffff8233fe30 process=0xffff800020b45a50 user=0xffff800020bf8000, vmspace=0xfffffd807efff9d8 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 26101 230585 18008 0 7 0 syz-executor.1 *26101 201773 18008 0 7 0x4000000 syz-executor.1 67924 273907 1 0 3 0x100083 ttyin getty 7083 202672 91335 0 3 0x2 biowait syz-executor.0 8232 18540 0 0 3 0x14200 bored sosplice 18008 8514 91335 0 3 0x82 nanosleep syz-executor.1 91335 466883 50937 0 3 0x82 thrsleep syz-fuzzer 91335 144027 50937 0 3 0x4000082 nanosleep syz-fuzzer 91335 389904 50937 0 3 0x4000082 thrsleep syz-fuzzer 91335 269152 50937 0 3 0x4000082 thrsleep syz-fuzzer 91335 293760 50937 0 3 0x4000082 thrsleep syz-fuzzer 91335 473786 50937 0 3 0x4000082 thrsleep syz-fuzzer 91335 87040 50937 0 3 0x4000082 thrsleep syz-fuzzer 91335 78543 50937 0 3 0x4000082 thrsleep syz-fuzzer 91335 169985 50937 0 3 0x4000082 kqread syz-fuzzer 91335 119908 50937 0 3 0x4000082 thrsleep syz-fuzzer 50937 103392 40791 0 3 0x10008a pause ksh 40791 101680 81966 0 3 0x92 select sshd 81966 27884 1 0 3 0x80 select sshd 76830 375842 80324 73 2 0x100090 syslogd 80324 262470 1 0 3 0x100082 netio syslogd 49281 307237 1 77 3 0x100090 poll dhclient 55308 393014 1 0 3 0x80 poll dhclient 19516 307242 0 0 3 0x14200 pgzero zerothread 13513 403258 0 0 3 0x14200 aiodoned aiodoned 24786 52860 0 0 3 0x14200 syncer update 35567 317166 0 0 3 0x14200 cleaner cleaner 19809 189608 0 0 3 0x14200 reaper reaper 11923 269340 0 0 3 0x14200 pgdaemon pagedaemon 6581 75330 0 0 3 0x14200 bored crynlk 35688 340535 0 0 3 0x14200 bored crypto 95181 359981 0 0 3 0x40014200 acpi0 acpi0 52429 163644 0 0 3 0x40014200 idle1 30289 5956 0 0 3 0x14200 bored softnet 53044 52798 0 0 3 0x14200 bored systqmp 34441 43930 0 0 3 0x14200 bored systq 69731 444033 0 0 3 0x40014200 bored softclock 64026 277025 0 0 3 0x40014200 idle0 1 181711 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 26101 (syz-executor.1) thread 0xffff800020b42978 (201773) shared rwlock wsmuxlk r = 0 (0xffff800000026dd0) locked @ /syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:245 #0 witness_lock+0x58a sys/kern/subr_witness.c:1205 #1 wsmuxopen+0xf3 wsmux_do_open sys/dev/wscons/wsmux.c:246 [inline] #1 wsmuxopen+0xf3 sys/dev/wscons/wsmux.c:204 #2 spec_open+0x217 sys/kern/spec_vnops.c:158 #3 VOP_OPEN+0x76 sys/kern/vfs_vops.c:153 #4 vn_open+0x4c6 sys/kern/vfs_vnops.c:174 #5 doopenat+0x2be sys/kern/vfs_syscalls.c:1045 #6 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] #6 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 #7 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8230eba0) locked @ /syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90 #0 witness_lock+0x58a sys/kern/subr_witness.c:1205 #1 syscall+0x47f mi_syscall sys/sys/syscall_mi.h:91 [inline] #1 syscall+0x47f sys/arch/amd64/amd64/trap.c:574 #2 Xsyscall+0x128 Process 7083 (syz-executor.0) thread 0xffff800020b42bd0 (202672) exclusive rrwlock inode r = 0 (0xfffffd80689cce70) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_vnops.c:1547 #0 witness_lock+0x58a sys/kern/subr_witness.c:1205 #1 _rw_enter+0x44d sys/kern/kern_rwlock.c:280 #2 _rrw_enter+0x60 sys/kern/kern_rwlock.c:410 #3 VOP_LOCK+0x57 sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:549 #5 vget+0x1b8 sys/kern/vfs_subr.c:672 #6 ufs_ihashget+0x151 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x84 sys/ufs/ffs/ffs_vfsops.c:1323 #8 ufs_lookup+0x159c sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x67 sys/kern/vfs_vops.c:90 #10 vfs_lookup+0x556 sys/kern/vfs_lookup.c:523 #11 namei+0x4b2 sys/kern/vfs_lookup.c:224 #12 dounlinkat+0xa5 sys/kern/vfs_syscalls.c:1673 #13 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] #13 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80689cca30) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_vnops.c:1547 #0 witness_lock+0x58a sys/kern/subr_witness.c:1205 #1 _rw_enter+0x44d sys/kern/kern_rwlock.c:280 #2 _rrw_enter+0x60 sys/kern/kern_rwlock.c:410 #3 VOP_LOCK+0x57 sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:549 #5 vget+0x1b8 sys/kern/vfs_subr.c:672 #6 cache_lookup+0x300 sys/kern/vfs_cache.c:224 #7 ufs_lookup+0x1d7 sys/ufs/ufs/ufs_lookup.c:162 #8 VOP_LOOKUP+0x67 sys/kern/vfs_vops.c:90 #9 vfs_lookup+0x556 sys/kern/vfs_lookup.c:523 #10 namei+0x4b2 sys/kern/vfs_lookup.c:224 #11 dounlinkat+0xa5 sys/kern/vfs_syscalls.c:1673 #12 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] #12 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 #13 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9547 6377K 6384K 78643K 11731 0 0 pcb 23 9K 11K 78643K 1725 0 0 rtable 100 3K 4K 78643K 822 0 0 ifaddr 65 15K 16K 78643K 432 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 34 0 0 iov 0 0K 24K 78643K 337 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1191 74K 76K 78643K 3084 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 43 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 356 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 5 13K 25K 78643K 2992 0 0 sigio 0 0K 0K 78643K 63 0 0 proc 42 38K 78K 78643K 769 0 0 subproc 64 65538K 67586K 78643K 114 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 434 0 0 in_multi 33 2K 2K 78643K 155 0 0 ether_multi 1 0K 0K 78643K 19 0 0 mrt 0 0K 0K 78643K 6 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 102 450K 450K 78643K 102 0 0 exec 0 0K 1K 78643K 406 0 0 pfkey data 0 0K 4K 78643K 2 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 91 21K 29K 78643K 10418 0 0 UVM aobj 130 4K 4K 78643K 148 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 0K 78643K 114 0 0 NDP 14 0K 0K 78643K 118 0 0 temp 184 2367K 2435K 78643K 11064 0 0 kqueue 0 0K 0K 78643K 43 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 5 0 1 1 0 1 1 0 8 0 inpcbpl 280 1530 0 1522 1 0 1 1 0 8 0 plimitpl 152 49 0 42 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 50 0 10 2 0 2 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpcb 544 542 0 538 1 0 1 1 0 8 0 nd6 48 6 0 2 1 0 1 1 0 8 0 ppxss 1128 78 0 78 9 8 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 230 0 41 12 0 12 12 0 8 0 art_table 32 231 0 41 2 0 2 2 0 8 0 art_node 16 49 0 15 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 9 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 352 0 342 1 0 1 1 0 8 0 shmpl 112 146 0 18 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 7300 0 5842 49 1 48 48 0 8 0 ffsino 272 7300 0 5842 98 0 98 98 0 8 0 nchpl 144 11827 0 10226 61 0 61 61 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 200 5926 0 0 312 0 312 312 0 8 0 namei 1024 35882 0 35882 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 5 0 5 4 4 0 1 0 8 0 scxspl 192 31417 0 31416 14 10 4 6 0 8 3 sigapl 432 3163 0 3150 2 0 2 2 0 8 0 futexpl 56 34953 0 34953 1 0 1 1 0 8 1 knotepl 112 740 0 713 7 6 1 2 0 8 0 kqueuepl 104 861 0 859 1 0 1 1 0 8 0 pipepl 112 2052 0 2033 9 7 2 2 0 8 1 fdescpl 488 3164 0 3150 3 1 2 3 0 8 0 filepl 152 19895 0 19798 11 6 5 7 0 8 1 lockfpl 104 1008 0 1008 2 1 1 1 0 8 1 lockfspl 32 1100 0 1100 2 1 1 1 0 8 1 sessionpl 112 24 0 14 1 0 1 1 0 8 0 pgrppl 48 58 0 48 1 0 1 1 0 8 0 ucredpl 96 5713 0 5706 1 0 1 1 0 8 0 zombiepl 144 3150 0 3150 2 1 1 1 0 8 1 processpl 840 3179 0 3150 4 0 4 4 0 8 0 procpl 600 9644 0 9605 4 0 4 4 0 8 0 srpgc 64 6 0 6 1 1 0 1 0 8 0 sosppl 128 49 0 49 14 14 0 1 0 8 0 sockpl 384 3054 0 3036 5 2 3 4 0 8 1 mcl64k 65536 229 0 0 29 6 23 29 0 8 1 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 19 0 0 2 0 2 2 0 8 0 mcl8k 8192 13 0 0 2 0 2 2 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 126 0 0 14 0 14 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 460 0 0 19 0 19 19 0 8 0 bufpl 256 10831 0 3859 436 0 436 436 0 8 0 anonpl 16 315296 0 307368 141 92 49 49 0 125 15 amapchunkpl 152 18704 0 18608 46 41 5 12 0 158 0 amappl16 192 16851 0 16442 136 107 29 33 0 8 8 amappl15 184 4 0 2 1 0 1 1 0 8 0 amappl14 176 7 0 6 2 1 1 1 0 8 0 amappl13 168 630 0 626 1 0 1 1 0 8 0 amappl12 160 11 0 9 2 1 1 1 0 8 0 amappl11 152 1708 0 1697 1 0 1 1 0 8 0 amappl10 144 1758 0 1754 2 1 1 1 0 8 0 amappl9 136 1856 0 1851 1 0 1 1 0 8 0 amappl8 128 174 0 147 1 0 1 1 0 8 0 amappl7 120 638 0 631 1 0 1 1 0 8 0 amappl6 112 55 0 47 1 0 1 1 0 8 0 amappl5 104 186 0 174 1 0 1 1 0 8 0 amappl4 96 319 0 296 1 0 1 1 0 8 0 amappl3 88 241 0 236 1 0 1 1 0 8 0 amappl2 80 30415 0 30361 2 0 2 2 0 8 0 amappl1 72 75674 0 75260 23 13 10 19 0 8 0 amappl 72 9888 0 9853 1 0 1 1 0 75 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma64 64 259 0 259 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 17 0 17 1 1 0 1 0 8 0 aobjpl 64 147 0 18 4 1 3 3 0 8 0 uaddrrnd 24 3164 0 3150 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3164 0 3150 1 0 1 1 0 8 0 vmmpekpl 168 29852 0 29830 2 0 2 2 0 8 0 vmmpepl 168 333117 0 331761 160 86 74 75 0 357 11 vmsppl 360 3163 0 3150 2 0 2 2 0 8 0 pdppl 4096 6336 0 6300 6 1 5 6 0 8 0 pvpl 32 829941 0 819012 254 128 126 128 0 265 36 pmappl 224 3163 0 3150 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 629 0 10 18 0 18 18 0 8 0