login: panic: kernel diagnostic assertion "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_sig.c", line 1603 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 34942 10451 0 0x100002 0x8 0 sh *200192 5574 0 0x8000 0xc000000 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834bf130) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834ff7a7,ffffffff83463bf9,643,ffffffff83445fb7) at __assert+0x29 sys/kern/subr_prf.c:-1 process_stop(ffff800045fef9d8,8000000,1) at process_stop+0x3fe cursig(ffff800045fe9a10,ffff80002a356d48,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline] cursig(ffff800045fe9a10,ffff80002a356d48,0) at cursig+0x509 sys/kern/kern_sig.c:1446 userret(ffff800045fe9a10) at userret+0x203 sys/kern/kern_sig.c:2208 syscall(ffff80002a356e80) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80002a356e80) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:812 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xee42e96fbc0, 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 *cpu1: kernel diagnostic assertion "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_sig.c", line 1603 ddb{1}> show kasan No such command ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834bf130) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834ff7a7,ffffffff83463bf9,643,ffffffff83445fb7) at __assert+0x29 sys/kern/subr_prf.c:-1 process_stop(ffff800045fef9d8,8000000,1) at process_stop+0x3fe cursig(ffff800045fe9a10,ffff80002a356d48,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline] cursig(ffff800045fe9a10,ffff80002a356d48,0) at cursig+0x509 sys/kern/kern_sig.c:1446 userret(ffff800045fe9a10) at userret+0x203 sys/kern/kern_sig.c:2208 syscall(ffff80002a356e80) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80002a356e80) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:812 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xee42e96fbc0, count: -8 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a356b60 rbx 0xffff80002999ee07 rdx 0 rcx 0xffff800045fe9a10 rax 0xffff80002999dff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x1142a22347f32225 r11 0x4d713eac49f820b5 r12 0xffff80002999ec08 r13 0 r14 0 r15 0x1 rip 0xffffffff81bc99c5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a356b50 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=200192 pid=5574 tcnt=4 stat=onproc flags process=8000 proc=c000000 runpri=32, usrpri=73, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=2 ecnt=0 forw=0xffffffffffffffff, list=0xffff800045fe9248,0xffff800045fe8030 process=0xffff800045fef9d8 user=0xffff80002a351000, vmspace=0xfffff680782bdd68 estcpu=23, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 92937 427174 10451 0 2 0x100000 0 sh 64188 172086 26801 0 2 0x100002 0 sh 10451 34942 39251 0 7 0x100002 0x8 sh 5574 378967 26386 0 2 0x8000 0x8000000 syz-executor * 5574 200192 26386 0 7 0x8000 0xc000000 syz-executor 5574 218623 26386 0 4 0x8000 0xc000000 syz-executor 5574 130549 26386 0 4 0x8000 0xc000080 fsleep syz-executor 74887 373645 46083 0 2 0 0 syz-executor 74887 377796 46083 0 3 0 0x4000080 fsleep syz-executor 39251 92120 78730 0 3 0x2 0x80 wait syz-executor 26801 458161 78730 0 3 0x2 0x80 wait syz-executor 46083 263140 78730 0 3 0x2 0x80 nanoslp syz-executor 33698 458244 78730 0 3 0x2 0 biowait syz-executor 59272 86672 78730 0 3 0x2 0x80 piperd syz-executor 26386 101770 78730 0 3 0x2 0x80 nanoslp syz-executor 28562 504382 1 0 3 0x100003 0x80 ttyin getty 79713 133136 78730 0 3 0x2 0x80 piperd syz-executor 78730 67761 1 0 3 0x2 0x80 nanoslp syz-executor 90984 328521 1 0 3 0x10000002 0x88 kqread sshd 56489 521960 97011 74 3 0x1100012 0x80 bpf pflogd 97011 67323 1 0 3 0 0x80 sbwait pflogd 98781 350909 42646 73 3 0x1100010 0x80 kqread syslogd 42646 467696 1 0 3 0x100002 0x80 sbwait syslogd 23718 93013 1 0 3 0x100000 0x80 kqread resolvd 24436 111379 92566 77 3 0x100012 0x80 kqread dhcpleased 85205 177871 92566 77 3 0x100012 0x80 kqread dhcpleased 92566 259642 1 0 3 0 0x80 kqread dhcpleased 47920 193060 0 0 3 0x14000 0x200 bored smr 48556 51416 0 0 2 0x14000 0x200 zerothread 2 295842 0 0 3 0x14000 0x200 aiodoned aiodoned 36704 137405 0 0 3 0x14000 0x200 syncer update 57194 127378 0 0 3 0x14000 0x200 cleaner cleaner 97940 72216 0 0 3 0x14000 0x200 reaper reaper 91018 327951 0 0 3 0x14000 0x200 pgdaemon pagedaemon 25924 52093 0 0 3 0x14000 0x200 bored viomb 65293 397534 0 0 3 0x14000 0x40000200 acpi0 acpi0 97861 39952 0 0 3 0x14000 0x40000200 idle1 92531 284203 0 0 3 0x14000 0x200 bored softnet1 74725 466746 0 0 3 0x14000 0x200 bored softnet0 97310 45929 0 0 3 0x14000 0x200 smrbar systqmp 25149 445477 0 0 3 0x14000 0x200 bored systq 38280 286844 0 0 3 0x14000 0x200 tmoslp softclockmp 38552 222179 0 0 3 0x14000 0x40000200 tmoslp softclock 47664 197292 0 0 3 0x14000 0x40000200 idle0 1 20111 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &sched_lock r = 0 (0xffffffff83a6b598) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 cursig+0x4ee sys/kern/kern_sig.c:1445 #3 userret+0x203 sys/kern/kern_sig.c:2208 #4 syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] #4 syscall+0x9ce sys/arch/amd64/amd64/trap.c:812 #5 Xsyscall+0x128 exclusive mutex &pr->ps_mtx r = 0 (0xffff800045fefaf0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 cursig+0x4c2 sys/kern/kern_sig.c:1441 #3 userret+0x203 sys/kern/kern_sig.c:2208 #4 syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] #4 syscall+0x9ce sys/arch/amd64/amd64/trap.c:812 #5 Xsyscall+0x128 Process 33698 (syz-executor) thread 0xffff800045fe9ca8 (458244) exclusive rrwlock inode r = 0 (0xfffff6807038a430) #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+0xbd sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:150 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3063 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffff6807c5f98f8) #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+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431 #6 namei+0x7c5 sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3048 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 #9 Xsyscall+0x128 Process 97310 (systqmp) thread 0xffff800045ffe000 (45929) shared rwlock systqmp r = 0 (0xffffffff83992df8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11056 12167K 12205K 166960K 12307 0 pcb 17 12K 12K 166960K 50 0 rtable 140 5K 7K 166960K 1340 0 pf 29 16K 24K 166960K 213 0 ifaddr 30 5K 8K 166960K 158 0 ifgroup 43 2K 2K 166960K 173 0 sysctl 1 1K 9K 166960K 5 0 counters 64 36K 37K 166960K 134 0 ioctlops 0 0K 4K 166960K 1537 0 iov 0 0K 16K 166960K 9 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1326 83K 83K 166960K 1751 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 11 0K 0K 166960K 13 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 14 49K 93K 166960K 656 0 sigio 0 0K 0K 166960K 1 0 proc 72 115K 180K 166960K 1281 0 subproc 63 3K 4K 166960K 315 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 10 0 in_multi 58 3K 6K 166960K 393 0 ether_multi 1 0K 0K 166960K 3 0 mrt 0 0K 0K 166960K 16 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 927 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 182 151K 185K 166960K 6580 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 34 68K 107K 166960K 2517 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 2 0 NDP 9 0K 2K 166960K 109 0 temp 37 9118K 9138K 166960K 18214 0 kqueue 11 16K 26K 166960K 46 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 28 0 0 1 0 1 1 0 8 0 rtpcb 120 97 0 93 1 0 1 1 0 8 0 rtentry 176 395 0 338 6 0 6 6 0 8 1 unpcb 144 98 0 83 1 0 1 1 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 165 0 162 7 0 7 7 0 8 6 arp 136 68 0 58 1 0 1 1 0 8 0 inpcb 328 465 0 458 7 0 7 7 0 8 6 nd6 152 102 0 90 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 0 1 1 0 8 1 kcovpl 48 35 0 28 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 4 0 4 1 1 0 1 0 8 0 pppxif 1576 1 0 1 1 1 0 1 0 8 0 pfstscr 40 1 0 0 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 pfsrclim 320 1 0 1 1 0 1 1 0 8 1 pfanchor 1288 25 0 25 2 0 2 2 0 8 2 pftag 88 1 0 1 1 0 1 1 0 8 1 pfqueue 320 2 0 2 1 0 1 1 0 8 1 pfstitem 24 31 0 0 1 0 1 1 0 8 0 pfstkey 128 31 0 0 1 0 1 1 0 8 0 pfstate 448 29 0 0 4 0 4 4 0 8 0 pfrule 1360 27 0 21 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1646 0 1329 35 6 29 33 0 8 2 art_table 40 1647 0 1329 6 0 6 6 0 8 0 art_node 32 395 0 326 1 0 1 1 0 8 0 semapl 72 11 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1810 0 277 96 0 96 96 0 8 0 ffsino 296 1810 0 277 118 0 118 118 0 8 0 nchpl 144 2217 0 417 67 0 67 67 0 8 0 rtmask 32 1 0 1 1 1 0 1 0 8 0 vnodes 216 2267 0 0 126 0 126 126 0 8 0 namei 1024 11230 0 11229 3 2 1 2 0 8 0 percpumem 16 83 0 35 1 0 1 1 0 8 0 kstatmem 264 87 0 66 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 7979 0 7978 10 2 8 8 1 8 7 plimitpl 152 88 0 74 1 0 1 1 0 8 0 sigapl 424 932 0 890 7 1 6 7 0 8 0 knotepl 120 310 0 0 10 0 10 10 0 8 0 kqueuepl 224 57 0 50 1 0 1 1 0 8 0 pipepl 344 221 0 194 4 0 4 4 0 8 0 fdescpl 528 916 0 891 3 0 3 3 0 8 0 filepl 160 3566 0 3375 12 0 12 12 0 8 0 lockfpl 104 96 0 94 1 0 1 1 0 8 0 lockfspl 48 48 0 46 1 0 1 1 0 8 0 sessionpl 144 55 0 46 1 0 1 1 0 8 0 pgrppl 48 92 0 75 1 0 1 1 0 8 0 ucredpl 104 239 0 226 1 0 1 1 0 8 0 zombiepl 144 891 0 890 1 0 1 1 0 8 0 processpl 1232 932 0 890 6 1 5 5 0 8 1 procpl 664 1210 0 1164 6 0 6 6 0 8 0 sockpl 752 665 0 639 10 0 10 10 0 8 6 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k128 9344 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 122 0 0 16 0 16 16 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mextrefs 64 19 0 0 1 0 1 1 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 148 0 0 10 0 10 10 0 8 0 bufpl 272 2771 0 105 178 0 178 178 0 8 0 anonpl 32 3748 0 0 31 0 31 31 0 247 0 amapchunkpl 152 17488 0 17161 24 0 24 24 0 158 8 amappl16 200 1775 0 1759 6 3 3 5 0 8 1 amappl15 192 5 0 5