witness: lock order reversal: 1st 0xfffffd8078e61708 inode (&ip->i_lock) @ /syzkaller/managers/pf/kernel/sys/ufs/ufs/ufs_vnops.c:1547 2nd 0xfffffd807959fdd0 fdlock (&newfdp->fd_fd.fd_lock) @ /syzkaller/managers/pf/kernel/sys/kern/vfs_syscalls.c:1113 lock order "&newfdp->fd_fd.fd_lock"(rwlock) -> "&ip->i_lock"(rrwlock) first seen at: #0 witness_checkorder+0x6cd sys/kern/subr_witness.c:906 #1 _rw_enter+0xd5 #2 _rrw_enter+0x60 sys/kern/kern_rwlock.c:410 #3 VOP_LOCK+0x57 sys/kern/vfs_vops.c:602 #4 vn_closefile+0x139 vn_lock sys/kern/vfs_vnops.c:549 [inline] #4 vn_closefile+0x139 vn_close sys/kern/vfs_vnops.c:288 [inline] #4 vn_closefile+0x139 sys/kern/vfs_vnops.c:575 #5 fdrop+0xe1 sys/kern/kern_descrip.c:1260 #6 closef+0x129 sys/kern/kern_descrip.c:1244 #7 finishdup+0x2e6 sys/kern/kern_descrip.c:679 #8 dodup3+0x64b sys/kern/kern_descrip.c:377 #9 syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] #9 syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 #10 Xsyscall+0x128 lock order "&ip->i_lock"(rrwlock) -> "&newfdp->fd_fd.fd_lock"(rwlock) first seen at: #0 witness_checkorder+0x6cd sys/kern/subr_witness.c:906 #1 _rw_enter_write+0x6f sys/kern/kern_rwlock.c:118 #2 doopenat+0x6b1 sys/kern/vfs_syscalls.c:1114 #3 syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] #3 syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 #4 Xsyscall+0x128 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(fffffd807959fdd0,9,ffffffff81f4f054,459,0) at witness_checkorder+0x12ff witness_debugger sys/kern/subr_witness.c:2650 [inline] witness_checkorder(fffffd807959fdd0,9,ffffffff81f4f054,459,0) at witness_checkorder+0x12ff sys/kern/subr_witness.c:1122 _rw_enter_write(fffffd807959fdc0,ffffffff81f4f054,459) at _rw_enter_write+0x6f sys/kern/kern_rwlock.c:118 doopenat(ffff800020b74e28,ffffff9c,20000000,0,0,ffff800020c37060) at doopenat+0x6b1 sys/kern/vfs_syscalls.c:1114 syscall(ffff800020c37110) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020c37110) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,ffffffffffffffa8,0,3,ade9fe940d8) at Xsyscall+0x128 end of kernel end trace frame: 0xae1752d38c0, count: -6 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020c36ca0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800002d66000 rax 0xffff80000091fdc0 r8 0xffffffff812b1aa8 witness_checkorder+0x12d8 r9 0x5 r10 0x3 r11 0x1df21d69cef873f8 r12 0xffffffff81f4f054 cmd0646_9_tim_udma+0x49e06 r13 0xfffffd800263d890 r14 0xffffffff822dde20 w_lodata+0x4e970 r15 0xfffffd8002638660 rip 0xffffffff81d05a08 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c36c90 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=388477 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020b752d8,0xffff800020b74028 process=0xffff800020b8c360 user=0xffff800020c32000, vmspace=0xfffffd807effeb40 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 48709 279423 562 0 7 0 syz-executor.0 48709 520993 562 0 3 0x4000080 fsleep syz-executor.0 35656 388202 20997 0 2 0 syz-executor.1 35656 200388 20997 0 3 0x4000080 fsleep syz-executor.1 *35656 388477 20997 0 7 0x4000000 syz-executor.1 74673 70269 0 0 3 0x14200 bored sosplice 20997 428852 1995 0 3 0x82 nanosleep syz-executor.1 562 93681 1995 0 3 0x82 nanosleep syz-executor.0 1995 103433 42178 0 3 0x82 thrsleep syz-fuzzer 1995 512488 42178 0 3 0x4000082 thrsleep syz-fuzzer 1995 177191 42178 0 3 0x4000082 thrsleep syz-fuzzer 1995 434706 42178 0 3 0x4000082 thrsleep syz-fuzzer 1995 405873 42178 0 3 0x4000082 thrsleep syz-fuzzer 1995 166876 42178 0 3 0x4000082 kqread syz-fuzzer 1995 184490 42178 0 3 0x4000082 thrsleep syz-fuzzer 1995 245204 42178 0 3 0x4000082 thrsleep syz-fuzzer 1995 197350 42178 0 3 0x4000082 thrsleep syz-fuzzer 1995 494880 42178 0 3 0x4000082 thrsleep syz-fuzzer 42178 41208 58236 0 3 0x10008a pause ksh 58236 296057 52938 0 3 0x92 select sshd 2239 87536 1 0 3 0x100083 ttyin getty 52938 429907 1 0 3 0x80 select sshd 31733 251807 33952 74 3 0x100092 bpf pflogd 33952 459250 1 0 3 0x80 netio pflogd 85789 301995 36143 73 2 0x100090 syslogd 36143 503989 1 0 3 0x100082 netio syslogd 7623 283131 1 77 3 0x100090 poll dhclient 75242 378151 1 0 3 0x80 poll dhclient 81850 207566 0 0 2 0x14200 zerothread 46588 70292 0 0 3 0x14200 aiodoned aiodoned 34790 460709 0 0 3 0x14200 syncer update 93594 316631 0 0 3 0x14200 cleaner cleaner 91003 161852 0 0 3 0x14200 reaper reaper 79851 292852 0 0 3 0x14200 pgdaemon pagedaemon 93706 259647 0 0 3 0x14200 bored crynlk 44272 267580 0 0 3 0x14200 bored crypto 51829 155820 0 0 3 0x40014200 acpi0 acpi0 95812 191967 0 0 3 0x40014200 idle1 5312 191595 0 0 3 0x14200 bored softnet 29751 105954 0 0 3 0x14200 bored systqmp 6482 470624 0 0 3 0x14200 bored systq 12424 362829 0 0 3 0x40014200 bored softclock 18651 451751 0 0 3 0x40014200 idle0 36890 62508 0 0 3 0x14200 bored smr 1 492936 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 35656 (syz-executor.1) thread 0xffff800020b74e28 (388477) exclusive rrwlock inode r = 0 (0xfffffd8078e61708) locked @ /syzkaller/managers/pf/kernel/sys/ufs/ufs/ufs_vnops.c:1547 #0 witness_lock+0x594 sys/kern/subr_witness.c:1205 #1 _rw_enter+0x45d 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 spec_open+0x22c sys/kern/spec_vnops.c:159 #6 VOP_OPEN+0x76 sys/kern/vfs_vops.c:153 #7 vn_open+0x4d2 sys/kern/vfs_vnops.c:174 #8 doopenat+0x2ca sys/kern/vfs_syscalls.c:1045 #9 syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] #9 syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 #10 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82368840) locked @ /syzkaller/managers/pf/kernel/sys/kern/sched_bsd.c:439 #0 witness_lock+0x594 sys/kern/subr_witness.c:1205 #1 ___mp_acquire_count+0x67 sys/kern/kern_lock.c:231 #2 mi_switch+0x3ca sys/kern/sched_bsd.c:439 #3 sleep_finish+0x110 sys/kern/kern_synch.c:312 #4 _rw_enter+0x355 sys/kern/kern_rwlock.c:256 #5 _rrw_enter+0x60 sys/kern/kern_rwlock.c:410 #6 VOP_LOCK+0x57 sys/kern/vfs_vops.c:602 #7 vn_lock+0x6e sys/kern/vfs_vnops.c:549 #8 spec_open+0x22c sys/kern/spec_vnops.c:159 #9 VOP_OPEN+0x76 sys/kern/vfs_vops.c:153 #10 vn_open+0x4d2 sys/kern/vfs_vnops.c:174 #11 doopenat+0x2ca sys/kern/vfs_syscalls.c:1045 #12 syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] #12 syscall+0x5b8 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 9484 6397K 6421K 78643K 10604 0 0 pcb 25 9K 10K 78643K 97 0 0 rtable 100 3K 4K 78643K 203 0 0 ifaddr 46 11K 12K 78643K 59 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1469 0 0 iov 0 0K 16K 78643K 8 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1198 75K 75K 78643K 1261 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 3 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 26 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12628 0 0 file desc 6 17K 25K 78643K 125 0 0 sigio 0 0K 0K 78643K 1 0 0 proc 53 50K 83K 78643K 325 0 0 subproc 64 65538K 67586K 78643K 70 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 11 0 0 in_multi 33 2K 2K 78643K 38 0 0 ether_multi 1 0K 0K 78643K 1 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 48 212K 212K 78643K 48 0 0 exec 0 0K 1K 78643K 195 0 0 pfkey data 0 0K 0K 78643K 1 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 86 20K 22K 78643K 1204 0 0 UVM aobj 6 2K 2K 78643K 6 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 8 0 0 NDP 8 0K 0K 78643K 15 0 0 temp 108 2366K 2432K 78643K 3357 0 0 kqueue 0 0K 0K 78643K 4 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 4 0 0 1 0 1 1 0 8 0 inpcbpl 280 85 0 78 1 0 1 1 0 8 0 plimitpl 152 16 0 8 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 32 553 0 553 2 2 0 1 0 8 0 tcpcb 544 30 0 26 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 3 0 3 1 0 1 1 0 8 1 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 12 0 3 1 0 1 1 0 8 0 pfstkey 112 12 0 3 1 0 1 1 0 8 0 pfstate 328 12 0 3 1 0 1 1 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 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 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 24 0 14 1 0 1 1 0 8 0 shmpl 112 4 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1636 0 223 46 0 46 46 0 8 0 ffsino 272 1636 0 223 95 0 95 95 0 8 0 nchpl 144 2009 0 381 61 0 61 61 0 8 0 uvmvnodes 72 1684 0 0 31 0 31 31 0 8 0 vnodes 200 1684 0 0 89 0 89 89 0 8 0 namei 1024 5150 0 5150 3 2 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 4807 0 4807 10 9 1 6 0 8 1 sigapl 432 321 0 305 3 1 2 3 0 8 0 futexpl 56 1102 0 1100 1 0 1 1 0 8 0 knotepl 112 79 0 52 2 1 1 2 0 8 0 kqueuepl 104 28 0 26 1 0 1 1 0 8 0 pipepl 112 202 0 183 2 1 1 1 0 8 0 fdescpl 488 322 0 305 5 2 3 3 0 8 0 filepl 152 1628 0 1524 6 1 5 5 0 8 0 lockfpl 104 45 0 45 2 1 1 1 0 8 1 lockfspl 32 90 0 90 2 1 1 1 0 8 1 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 20 0 9 1 0 1 1 0 8 0 ucredpl 96 203 0 194 1 0 1 1 0 8 0 zombiepl 144 305 0 305 3 2 1 1 0 8 1 processpl 840 338 0 305 4 0 4 4 0 8 0 procpl 600 561 0 516 4 0 4 4 0 8 0 sosppl 128 2 0 2 1 1 0 1 0 8 0 sockpl 384 153 0 134 3 0 3 3 0 8 0 mcl64k 65536 1 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 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 111 0 0 13 0 13 13 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 139 0 0 8 0 8 8 0 8 0 bufpl 256 5492 0 1043 279 0 279 279 0 8 0 anonpl 16 39903 0 32479 48 7 41 45 0 125 11 amapchunkpl 152 1393 0 1303 6 2 4 5 0 158 0 amappl16 192 1158 0 775 31 9 22 31 0 8 2 amappl15 184 5 0 3 1 0 1 1 0 8 0 amappl14 176 84 0 77 1 0 1 1 0 8 0 amappl13 168 25 0 22 1 0 1 1 0 8 0 amappl12 160 118 0 114 2 1 1 1 0 8 0 amappl11 152 213 0 199 1 0 1 1 0 8 0 amappl10 144 66 0 61 1 0 1 1 0 8 0 amappl9 136 332 0 328 1 0 1 1 0 8 0 amappl8 128 239 0 219 1 0 1 1 0 8 0 amappl7 120 31 0 27 1 0 1 1 0 8 0 amappl6 112 56 0 50 1 0 1 1 0 8 0 amappl5 104 183 0 169 1 0 1 1 0 8 0 amappl4 96 312 0 286 2 1 1 2 0 8 0 amappl3 88 125 0 119 1 0 1 1 0 8 0 amappl2 80 1760 0 1694 3 1 2 2 0 8 0 amappl1 72 16156 0 15687 25 15 10 19 0 8 0 amappl 72 795 0 758 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 5 0 0 1 0 1 1 0 8 0 uaddrrnd 24 322 0 305 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 322 0 305 1 0 1 1 0 8 0 vmmpekpl 168 6576 0 6554 2 0 2 2 0 8 0 vmmpepl 168 41043 0 39557 121 50 71 75 0 357 6 vmsppl 360 321 0 305 2 0 2 2 0 8 0 pdppl 4096 652 0 610 6 0 6 6 0 8 0 pvpl 32 141112 0 130448 154 36 118 121 0 265 30 pmappl 224 321 0 305 2 1 1 2 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 429 0 5 13 0 13 13 0 8 0