login: panic: kernel diagnostic assertion "tname->un_flags & UNVEIL_USERSET" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_unveil.c", line 879 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 93722 68717 0 0x2 0 0 syz-executor0268 *311711 68717 0 0x2 0x4000000 1K syz-executor0268 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x174 sys/kern/subr_prf.c:208 __assert(ffffffff81f7dcd5,ffffffff81f30eae,36f,ffffffff81f8a767) at __assert+0x2e sys/kern/subr_prf.c:155 unveil_check_final(ffff800020b66268,ffff800020b9cf00) at unveil_check_final+0x81d sys/kern/kern_unveil.c:879 namei(ffff800020b9cf00) at namei+0x88b sys/kern/vfs_lookup.c:232 dounlinkat(ffff800020b66268,ffffff9c,20000040,0) at dounlinkat+0xa5 sys/kern/vfs_syscalls.c:1673 syscall(ffff800020b9d110) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020b9d110) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,b604000b0b8,0,b604000b098,b604000b090) at Xsyscall+0x128 end of kernel end trace frame: 0xb6319a0bbc0, count: 7 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic kernel diagnostic assertion "tname->un_flags & UNVEIL_USERSET" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_unveil.c", line 879 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x174 sys/kern/subr_prf.c:208 __assert(ffffffff81f7dcd5,ffffffff81f30eae,36f,ffffffff81f8a767) at __assert+0x2e sys/kern/subr_prf.c:155 unveil_check_final(ffff800020b66268,ffff800020b9cf00) at unveil_check_final+0x81d sys/kern/kern_unveil.c:879 namei(ffff800020b9cf00) at namei+0x88b sys/kern/vfs_lookup.c:232 dounlinkat(ffff800020b66268,ffffff9c,20000040,0) at dounlinkat+0xa5 sys/kern/vfs_syscalls.c:1673 syscall(ffff800020b9d110) at syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] syscall(ffff800020b9d110) at syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 Xsyscall(6,0,b604000b0b8,0,b604000b098,b604000b090) at Xsyscall+0x128 end of kernel end trace frame: 0xb6319a0bbc0, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020b9cca0 rbx 0xffff800020b9cd50 rdx 0xffffffff81f1fdc9 cmd0646_9_tim_udma+0x134a6 rcx 0x201 rax 0x1 r8 0xffffffff814ea2c3 kprintf+0x183 r9 0x1 r10 0x4e530c740250146f r11 0xe420df73ab8c244a r12 0x3000000008 r13 0xffff800020b9ccb0 r14 0x100 r15 0x1 rip 0xffffffff81c97598 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020b9cc90 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor0268) pid=311711 stat=onproc flags process=2 proc=4000000 pri=54, usrpri=54, nice=20 forw=0xffffffffffffffff, list=0xffff800020b66970,0xffffffff82349db8 process=0xffff800020b7c018 user=0xffff800020b98000, vmspace=0xfffffd806e9205a8 estcpu=4, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 68717 93722 46959 0 7 0x2 syz-executor0268 *68717 311711 46959 0 7 0x4000002 syz-executor0268 46959 116009 84031 0 3 0x10008a pause ksh 84031 413494 30940 0 3 0x92 select sshd 93859 176777 1 0 3 0x100083 ttyin getty 30940 83851 1 0 3 0x80 select sshd 89988 369884 96639 73 3 0x100090 kqread syslogd 96639 298673 1 0 3 0x100082 netio syslogd 27779 37636 1 77 3 0x100090 poll dhclient 12066 404892 1 0 3 0x80 poll dhclient 48633 148258 0 0 3 0x14200 pgzero zerothread 24413 123000 0 0 3 0x14200 aiodoned aiodoned 69075 228564 0 0 3 0x14200 syncer update 48483 273611 0 0 3 0x14200 cleaner cleaner 49459 152929 0 0 3 0x14200 reaper reaper 15351 397260 0 0 3 0x14200 pgdaemon pagedaemon 71474 150003 0 0 3 0x14200 bored crynlk 67315 451248 0 0 3 0x14200 bored crypto 18045 511739 0 0 3 0x40014200 acpi0 acpi0 99784 7925 0 0 3 0x40014200 idle1 38892 142917 0 0 3 0x14200 bored softnet 31424 188017 0 0 3 0x14200 bored systqmp 11929 334330 0 0 3 0x14200 bored systq 918 496504 0 0 3 0x40014200 bored softclock 77216 215750 0 0 3 0x40014200 idle0 12525 513623 0 0 3 0x14200 bored smr 1 23123 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 68717 (syz-executor0268) thread 0xffff800020b66268 (311711) exclusive rrwlock inode r = 0 (0xfffffd806dc41f80) locked @ /syzkaller/managers/setuid/kernel/sys/ufs/ufs/ufs_vnops.c:1547 #0 witness_lock+0x594 sys/kern/subr_witness.c:1201 #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 vget+0x1c3 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+0x15d3 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+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] #13 syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806ee233d8) locked @ /syzkaller/managers/setuid/kernel/sys/ufs/ufs/ufs_vnops.c:1547 #0 witness_lock+0x594 sys/kern/subr_witness.c:1201 #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 vfs_lookup+0xf5 sys/kern/vfs_lookup.c:387 #6 namei+0x4b2 sys/kern/vfs_lookup.c:224 #7 dounlinkat+0xa5 sys/kern/vfs_syscalls.c:1673 #8 syscall+0x5b8 mi_syscall sys/sys/syscall_mi.h:99 [inline] #8 syscall+0x5b8 sys/arch/amd64/amd64/trap.c:574 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82350b68) locked @ /syzkaller/managers/setuid/kernel/sys/sys/syscall_mi.h:90 #0 witness_lock+0x594 sys/kern/subr_witness.c:1201 #1 syscall+0x48b mi_syscall sys/sys/syscall_mi.h:91 [inline] #1 syscall+0x48b sys/arch/amd64/amd64/trap.c:574 #2 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9442 6315K 6316K 78643K 10529 0 0 pcb 23 9K 9K 78643K 55 0 0 rtable 61 2K 2K 78643K 115 0 0 ifaddr 21 7K 7K 78643K 21 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 13 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1166 73K 73K 78643K 1171 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 2 0K 0K 78643K 2 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12628 0 0 file desc 1 0K 0K 78643K 1 0 0 proc 43 50K 58K 78643K 211 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 in_multi 11 0K 0K 78643K 11 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 18 79K 79K 78643K 18 0 0 exec 0 0K 1K 78643K 152 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 49 2K 3K 78643K 661 0 0 UVM aobj 2 2K 2K 78643K 2 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 NDP 3 0K 0K 78643K 3 0 0 temp 30 2359K 2423K 78643K 1718 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 2 0 0 1 0 1 1 0 8 0 inpcbpl 280 22 0 16 1 0 1 1 0 8 0 plimitpl 152 13 0 8 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 syncache 264 5 0 5 1 0 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1382 0 16 45 0 45 45 0 8 0 ffsino 272 1382 0 16 92 0 92 92 0 8 0 nchpl 144 1556 0 31 57 0 57 57 0 8 0 uvmvnodes 72 1391 0 0 26 0 26 26 0 8 0 vnodes 200 1391 0 0 74 0 74 74 0 8 0 namei 1024 3286 0 3285 2 1 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 2261 0 2261 2 1 1 2 0 8 1 sigapl 432 176 0 166 2 0 2 2 0 8 0 knotepl 112 5 0 0 1 0 1 1 0 8 0 kqueuepl 104 1 0 0 1 0 1 1 0 8 0 pipepl 112 118 0 111 2 1 1 1 0 8 0 fdescpl 488 177 0 166 2 0 2 2 0 8 0 filepl 152 818 0 775 2 0 2 2 0 8 0 lockfpl 104 6 0 6 1 1 0 1 0 8 0 lockfspl 32 3 0 3 1 1 0 1 0 8 0 sessionpl 112 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 96 47 0 40 1 0 1 1 0 8 0 zombiepl 144 166 0 166 2 1 1 1 0 8 1 processpl 840 192 0 166 4 0 4 4 0 8 0 procpl 600 193 0 166 3 0 3 3 0 8 0 sockpl 384 64 0 48 2 0 2 2 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 71 0 0 9 0 9 9 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 97 0 0 6 0 6 6 0 8 0 bufpl 256 2063 0 254 114 0 114 114 0 8 0 anonpl 16 17138 0 15991 6 1 5 6 0 125 0 amapchunkpl 152 493 0 456 2 0 2 2 0 158 0 amappl16 192 27 0 25 1 0 1 1 0 8 0 amappl15 184 44 0 40 1 0 1 1 0 8 0 amappl14 176 14 0 13 2 1 1 1 0 8 0 amappl13 168 22 0 19 1 0 1 1 0 8 0 amappl12 160 6 0 6 1 0 1 1 0 8 1 amappl11 152 21 0 10 1 0 1 1 0 8 0 amappl10 144 47 0 47 2 1 1 1 0 8 1 amappl9 136 392 0 391 1 0 1 1 0 8 0 amappl8 128 85 0 79 1 0 1 1 0 8 0 amappl7 120 13 0 12 1 0 1 1 0 8 0 amappl6 112 42 0 38 1 0 1 1 0 8 0 amappl5 104 110 0 101 1 0 1 1 0 8 0 amappl4 96 377 0 356 1 0 1 1 0 8 0 amappl3 88 104 0 98 1 0 1 1 0 8 0 amappl2 80 523 0 480 1 0 1 1 0 8 0 amappl1 72 11770 0 11366 15 5 10 15 0 8 0 amappl 72 370 0 350 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 177 0 166 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 177 0 166 1 0 1 1 0 8 0 vmmpekpl 168 5257 0 5238 1 0 1 1 0 8 0 vmmpepl 168 23825 0 23082 45 11 34 43 0 357 1 vmsppl 360 176 0 166 2 0 2 2 0 8 0 pdppl 4096 362 0 332 5 0 5 5 0 8 0 pvpl 32 72140 0 69272 33 6 27 27 0 265 3 pmappl 224 176 0 166 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 242 0 3 7 0 7 7 0 8 0 ddb{1}>