witness: acquiring duplicate lock of same type: "&sc->sc_lock" 1st wsmuxlk @ /syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:629 2nd wsmuxlk @ /syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:245 Starting stack trace... witness_checkorder(ffff80000199e9d0,1,ffffffff81f36129,f5,0) at witness_checkorder+0xe14 witness_debugger sys/kern/subr_witness.c:2650 [inline] witness_checkorder(ffff80000199e9d0,1,ffffffff81f36129,f5,0) at witness_checkorder+0xe14 sys/kern/subr_witness.c:926 _rw_enter_read(ffff80000199e9c0,ffffffff81f36129,f5) at _rw_enter_read+0x80 sys/kern/kern_rwlock.c:102 wsmux_mux_open(ffff80000199e900,ffff800001993b50) at wsmux_mux_open+0x82 wsmux_do_open sys/dev/wscons/wsmux.c:246 [inline] wsmux_mux_open(ffff80000199e900,ffff800001993b50) at wsmux_mux_open+0x82 sys/dev/wscons/wsmux.c:228 wsmux_attach_sc(ffff800001993b00,ffff80000199e900) at wsmux_attach_sc+0x180 sys/dev/wscons/wsmux.c:670 VOP_IOCTL(fffffd8066275418,80085761,ffff800020c21620,f,fffffd807f7c7a80,ffff800020b42270) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8077890dc0,80085761,ffff800020c21620,ffff800020b42270) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b42270,ffff800020c21768,ffff800020c21750) at sys_ioctl+0x646 syscall(ffff800020c21800) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c21800) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff86,0,3,d01ea53e010) at Xsyscall+0x128 end of kernel end trace frame: 0xd0497a04d10, count: 248 End of stack trace. Stopped at db_enter+0x18: addq $0x8,%rsp ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 witness_checkorder(ffff80000199e9d0,1,ffffffff81f36129,f5,0) at witness_checkorder+0xe19 witness_debugger sys/kern/subr_witness.c:2650 [inline] witness_checkorder(ffff80000199e9d0,1,ffffffff81f36129,f5,0) at witness_checkorder+0xe19 sys/kern/subr_witness.c:926 _rw_enter_read(ffff80000199e9c0,ffffffff81f36129,f5) at _rw_enter_read+0x80 sys/kern/kern_rwlock.c:102 wsmux_mux_open(ffff80000199e900,ffff800001993b50) at wsmux_mux_open+0x82 wsmux_do_open sys/dev/wscons/wsmux.c:246 [inline] wsmux_mux_open(ffff80000199e900,ffff800001993b50) at wsmux_mux_open+0x82 sys/dev/wscons/wsmux.c:228 wsmux_attach_sc(ffff800001993b00,ffff80000199e900) at wsmux_attach_sc+0x180 sys/dev/wscons/wsmux.c:670 VOP_IOCTL(fffffd8066275418,80085761,ffff800020c21620,f,fffffd807f7c7a80,ffff800020b42270) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8077890dc0,80085761,ffff800020c21620,ffff800020b42270) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 sys_ioctl(ffff800020b42270,ffff800020c21768,ffff800020c21750) at sys_ioctl+0x646 syscall(ffff800020c21800) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c21800) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffff86,0,3,d01ea53e010) at Xsyscall+0x128 end of kernel end trace frame: 0xd0497a04d10, count: -10 ddb{0}> show registers rdi 0 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020c21250 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800000947000 rax 0xffff800000941d00 r8 0xffffffff8155ffb3 kprintf+0x183 r9 0x1 r10 0x25 r11 0xf780a95d0512b2ad 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 0xffff800020c21240 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=239062 stat=onproc flags process=0 proc=4000000 pri=78, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff800020b42720,0xffffffff8233fe30 process=0xffff800020b44358 user=0xffff800020c1c000, vmspace=0xfffffd807efff708 estcpu=28, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 39173 516287 73257 0 2 0 syz-executor.0 *39173 239062 73257 0 7 0x4000000 syz-executor.0 70938 345107 1 0 3 0x100083 ttyin getty 85896 329435 0 0 3 0x14200 bored sosplice 61517 159074 58886 0 3 0x2 biowait syz-executor.1 73257 463897 58886 0 3 0x82 nanosleep syz-executor.0 58886 107668 44461 0 3 0x82 thrsleep syz-fuzzer 58886 335209 44461 0 3 0x4000082 nanosleep syz-fuzzer 58886 98469 44461 0 3 0x4000082 thrsleep syz-fuzzer 58886 405192 44461 0 3 0x4000082 nanosleep syz-fuzzer 58886 212553 44461 0 3 0x4000082 thrsleep syz-fuzzer 58886 345387 44461 0 3 0x4000082 thrsleep syz-fuzzer 58886 430899 44461 0 3 0x4000082 thrsleep syz-fuzzer 58886 487832 44461 0 3 0x4000082 thrsleep syz-fuzzer 58886 65376 44461 0 3 0x4000082 kqread syz-fuzzer 58886 133304 44461 0 3 0x4000082 thrsleep syz-fuzzer 44461 434888 89888 0 3 0x10008a pause ksh 89888 332522 44654 0 3 0x92 select sshd 44654 354250 1 0 3 0x80 select sshd 2447 505874 90794 73 7 0x100090 syslogd 90794 346440 1 0 3 0x100082 netio syslogd 88607 331973 1 77 3 0x100090 poll dhclient 80990 320771 1 0 3 0x80 poll dhclient 78898 479751 0 0 3 0x14200 pgzero zerothread 93976 391230 0 0 3 0x14200 aiodoned aiodoned 97778 73713 0 0 3 0x14200 syncer update 35763 522815 0 0 3 0x14200 cleaner cleaner 27979 90335 0 0 3 0x14200 reaper reaper 91434 413722 0 0 3 0x14200 pgdaemon pagedaemon 89913 324999 0 0 3 0x14200 bored crynlk 63507 222473 0 0 3 0x14200 bored crypto 34056 145055 0 0 3 0x40014200 acpi0 acpi0 83836 140663 0 0 3 0x40014200 idle1 45599 192481 0 0 3 0x14200 bored softnet 30774 32409 0 0 3 0x14200 bored systqmp 55483 501606 0 0 3 0x14200 bored systq 91088 91272 0 0 3 0x40014200 bored softclock 23354 211510 0 0 3 0x40014200 idle0 1 257278 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 39173 (syz-executor.0) thread 0xffff800020b42270 (239062) exclusive rwlock wsmuxlk r = 0 (0xffff800001993bd0) locked @ /syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:629 #0 witness_lock+0x58a sys/kern/subr_witness.c:1205 #1 wsmux_attach_sc+0x48 sys/dev/wscons/wsmux.c:635 #2 VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290 #3 vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512 #4 sys_ioctl+0x646 #5 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] #5 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 #6 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 61517 (syz-executor.1) thread 0xffff800020b244b8 (159074) exclusive rrwlock inode r = 0 (0xfffffd8064deee68) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_ihash.c:140 #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 ufs_ihashins+0x67 sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x13d sys/ufs/ffs/ffs_vfsops.c:1352 #5 ffs_inode_alloc+0x1c3 sys/ufs/ffs/ffs_alloc.c:392 #6 ufs_mkdir+0x10f sys/ufs/ufs/ufs_vnops.c:1164 #7 VOP_MKDIR+0x76 sys/kern/vfs_vops.c:449 #8 domkdirat+0x12d sys/kern/vfs_syscalls.c:2881 #9 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] #9 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806a1e4808) 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 vfs_lookup+0xf5 sys/kern/vfs_lookup.c:387 #6 namei+0x4b2 sys/kern/vfs_lookup.c:224 #7 domkdirat+0x81 sys/kern/vfs_syscalls.c:2866 #8 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline] #8 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9529 14563K 14563K 78643K 11258 0 0 pcb 23 9K 10K 78643K 1236 0 0 rtable 100 3K 4K 78643K 490 0 0 ifaddr 59 13K 14K 78643K 242 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 25 0 0 iov 0 0K 32K 78643K 247 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1197 75K 76K 78643K 2436 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 30 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 256 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1792 194K 288K 78643K 12592 0 0 file desc 5 13K 25K 78643K 2036 0 0 sigio 0 0K 0K 78643K 42 0 0 proc 42 38K 58K 78643K 538 0 0 subproc 64 65538K 67586K 78643K 68 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 243 0 0 in_multi 33 2K 2K 78643K 95 0 0 ether_multi 1 0K 0K 78643K 7 0 0 mrt 0 0K 0K 78643K 4 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 90 397K 397K 78643K 90 0 0 exec 0 0K 1K 78643K 362 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 93 21K 30K 78643K 7377 0 0 UVM aobj 90 3K 3K 78643K 99 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 1K 78643K 78 0 0 NDP 12 0K 0K 78643K 65 0 0 temp 170 2367K 2438K 78643K 8223 0 0 kqueue 0 0K 0K 78643K 30 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 4 0 0 1 0 1 1 0 8 0 inpcbpl 280 966 0 959 1 0 1 1 0 8 0 plimitpl 152 36 0 29 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 41 0 1 2 0 2 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 544 332 0 328 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 37 0 37 11 10 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 185 0 0 12 0 12 12 0 8 0 art_table 32 186 0 0 2 0 2 2 0 8 0 art_node 16 40 0 6 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 5 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 252 0 242 1 0 1 1 0 8 0 shmpl 112 97 0 9 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 5399 0 3970 47 0 47 47 0 8 0 ffsino 272 5399 0 3970 97 1 96 96 0 8 0 nchpl 144 8564 0 6953 61 0 61 61 0 8 0 uvmvnodes 72 5601 0 0 102 0 102 102 0 8 0 vnodes 200 5601 0 0 295 0 295 295 0 8 0 namei 1024 26136 0 26135 1 0 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 12 0 12 6 6 0 1 0 8 0 scxspl 192 25206 0 25205 16 15 1 6 0 8 0 sigapl 432 2208 0 2195 2 0 2 2 0 8 0 futexpl 56 25384 0 25384 1 0 1 1 0 8 1 knotepl 112 541 0 514 7 6 1 2 0 8 0 kqueuepl 104 611 0 609 1 0 1 1 0 8 0 pipepl 112 1512 0 1493 7 6 1 2 0 8 0 fdescpl 488 2209 0 2195 3 1 2 3 0 8 0 filepl 152 14065 0 13970 7 2 5 5 0 8 1 lockfpl 104 692 0 692 3 2 1 1 0 8 1 lockfspl 32 821 0 821 2 1 1 1 0 8 1 sessionpl 112 21 0 11 1 0 1 1 0 8 0 pgrppl 48 37 0 27 1 0 1 1 0 8 0 ucredpl 96 4116 0 4109 1 0 1 1 0 8 0 zombiepl 144 2195 0 2195 2 1 1 1 0 8 1 processpl 840 2224 0 2195 4 0 4 4 0 8 0 procpl 600 6668 0 6629 4 0 4 4 0 8 0 sosppl 128 29 0 29 11 10 1 1 0 8 1 sockpl 384 2047 0 2030 4 1 3 3 0 8 1 mcl64k 65536 9 0 0 2 0 2 2 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 13 0 0 2 0 2 2 0 8 0 mcl9k 9216 19 0 0 2 0 2 2 0 8 0 mcl8k 8192 14 0 0 2 0 2 2 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 106 0 0 13 1 12 13 0 8 0 mtagpl 80 3 0 0 1 0 1 1 0 8 0 mbufpl 256 151 0 0 8 0 8 8 0 8 0 bufpl 256 9304 0 2332 436 0 436 436 0 8 0 anonpl 16 232754 0 224587 113 63 50 50 0 125 15 amapchunkpl 152 13491 0 13404 39 34 5 9 0 158 0 amappl16 192 10651 0 10217 97 67 30 34 0 8 8 amappl15 184 992 0 990 1 0 1 1 0 8 0 amappl14 176 1003 0 999 2 1 1 1 0 8 0 amappl13 168 25 0 22 1 0 1 1 0 8 0 amappl12 160 7 0 6 2 1 1 1 0 8 0 amappl11 152 1202 0 1191 1 0 1 1 0 8 0 amappl10 144 60 0 58 2 1 1 1 0 8 0 amappl9 136 270 0 267 1 0 1 1 0 8 0 amappl8 128 150 0 125 1 0 1 1 0 8 0 amappl7 120 41 0 34 1 0 1 1 0 8 0 amappl6 112 1048 0 1041 1 0 1 1 0 8 0 amappl5 104 316 0 304 1 0 1 1 0 8 0 amappl4 96 312 0 289 2 1 1 2 0 8 0 amappl3 88 224 0 219 1 0 1 1 0 8 0 amappl2 80 20998 0 20943 2 0 2 2 0 8 0 amappl1 72 57114 0 56700 24 14 10 19 0 8 0 amappl 72 6900 0 6867 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 98 0 9 2 0 2 2 0 8 0 uaddrrnd 24 2209 0 2195 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2209 0 2195 1 0 1 1 0 8 0 vmmpekpl 168 21902 0 21880 2 0 2 2 0 8 0 vmmpepl 168 241842 0 240467 137 66 71 76 0 357 6 vmsppl 360 2208 0 2195 2 0 2 2 0 8 0 pdppl 4096 4426 0 4390 6 1 5 6 0 8 0 pvpl 32 651666 0 640505 236 108 128 136 0 265 32 pmappl 224 2208 0 2195 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 588 0 5 17 0 17 17 0 8 0