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 119883 60965 0 0 0 1 syz-executor *165565 70412 60929 0x8010 0xc000000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834ca0a4) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff835066cc,ffffffff83472cbf,643,ffffffff83454f67) at __assert+0x29 sys/kern/subr_prf.c:-1 process_stop(ffff800045fefa38,8000000,1) at process_stop+0x3fe cursig(ffff80002a3494e8,ffff800033bac248,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline] cursig(ffff80002a3494e8,ffff800033bac248,0) at cursig+0x509 sys/kern/kern_sig.c:1446 userret(ffff80002a3494e8) at userret+0x203 sys/kern/kern_sig.c:2208 syscall(ffff800033bac380) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff800033bac380) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:812 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2314190b660, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: 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{0}> show kasan No such command ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834ca0a4) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff835066cc,ffffffff83472cbf,643,ffffffff83454f67) at __assert+0x29 sys/kern/subr_prf.c:-1 process_stop(ffff800045fefa38,8000000,1) at process_stop+0x3fe cursig(ffff80002a3494e8,ffff800033bac248,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline] cursig(ffff80002a3494e8,ffff800033bac248,0) at cursig+0x509 sys/kern/kern_sig.c:1446 userret(ffff80002a3494e8) at userret+0x203 sys/kern/kern_sig.c:2208 syscall(ffff800033bac380) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff800033bac380) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:812 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2314190b660, count: -8 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800033bac060 rbx 0xffffffff838ebe0f cpu_info_full_primary+0x2e0f rdx 0 rcx 0xffff80002a3494e8 rax 0xffffffff838eaff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xa5001126731cbb07 r11 0x310d433dff88dce8 r12 0xffffffff838ebc10 cpu_info_full_primary+0x2c10 r13 0 r14 0 r15 0x1 rip 0xffffffff82967815 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800033bac050 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=165565 pid=70412 tcnt=3 stat=onproc flags process=8010 proc=c000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=2 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a349cb0,0xffff80002a348fc8 process=0xffff800045fefa38 user=0xffff800033ba7000, vmspace=0xfffff38068b2a208 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 60965 119883 15866 0 7 0 0 syz-executor 60965 107658 15866 0 2 0 0x4000000 syz-executor 5384 70377 84754 0 2 0 0 syz-executor 5384 141416 84754 0 3 0 0x4000080 fsleep syz-executor 70412 10601 44312 60929 2 0x8010 0x8000000 syz-executor 70412 146282 44312 60929 4 0x8010 0xc000000 syz-executor *70412 165565 44312 60929 7 0x8010 0xc000000 syz-executor 10159 217010 88196 0 2 0 0 syz-executor 10159 8807 88196 0 3 0 0x4000080 fsleep syz-executor 16957 107171 50959 0 2 0 0 syz-executor 16957 447653 50959 0 3 0 0x4000080 fsleep syz-executor 16957 449313 50959 0 3 0 0x4000080 fsleep syz-executor 16957 205332 50959 0 2 0 0x4000000 syz-executor 38512 389843 65572 0 2 0x2 0 syz-executor 2755 343061 31201 0 3 0 0x80 nanoslp syz-executor 2755 260919 31201 0 3 0 0x4000080 kqsel syz-executor 2755 395393 31201 0 3 0 0x4000080 fsleep syz-executor 717 466280 65572 0 2 0x2 0 syz-executor 15866 48948 65572 0 3 0x2 0x80 nanoslp syz-executor 88196 412698 65572 0 2 0x2 0 syz-executor 44312 378862 65572 0 3 0x2 0x80 nanoslp syz-executor 84754 330642 65572 0 3 0x2 0x80 nanoslp syz-executor 31201 334144 65572 0 3 0x2 0x80 nanoslp syz-executor 50959 17276 65572 0 3 0x2 0x80 nanoslp syz-executor 65572 429886 75769 0 3 0x2 0x80 kqread syz-executor 75769 82830 95426 0 3 0x100002 0x88 sigsusp ksh 95426 507240 80282 0 3 0x10 0x88 kqread sshd-session 80282 215009 86069 0 3 0x12 0x80 kqread sshd-session 45321 345958 1 0 3 0x100003 0x80 ttyin getty 86069 335895 1 0 3 0 0x88 kqread sshd 45640 371116 63749 74 3 0x1100012 0x80 bpf pflogd 63749 516693 1 0 3 0 0x80 sbwait pflogd 11680 50482 95018 73 3 0x1100010 0x80 kqread syslogd 95018 162347 1 0 3 0x100002 0x80 sbwait syslogd 64897 443321 1 0 3 0x100000 0x80 kqread resolvd 71923 21800 63296 77 3 0x100012 0x80 kqread dhcpleased 16356 451639 63296 77 3 0x100012 0x80 kqread dhcpleased 63296 218810 1 0 3 0 0x80 kqread dhcpleased 70531 447734 0 0 3 0x14000 0x200 bored smr 37044 103182 0 0 2 0x14000 0x200 zerothread 80597 166982 0 0 3 0x14000 0x200 aiodoned aiodoned 48263 471223 0 0 3 0x14000 0x200 syncer update 63815 491945 0 0 3 0x14000 0x200 cleaner cleaner 2771 362386 0 0 3 0x14000 0x200 reaper reaper 7271 407769 0 0 3 0x14000 0x200 pgdaemon pagedaemon 33296 12503 0 0 3 0x14000 0x200 bored viomb 29810 291393 0 0 3 0x14000 0x40000200 acpi0 acpi0 81565 295207 0 0 3 0x14000 0x40000200 idle1 72398 151252 0 0 3 0x14000 0x200 bored softnet1 40549 51147 0 0 3 0x14000 0x200 bored softnet0 70003 240013 0 0 3 0x14000 0x200 smrbar systqmp 68047 5734 0 0 3 0x14000 0x200 bored systq 36714 39682 0 0 3 0x14000 0x200 tmoslp softclockmp 35094 49613 0 0 3 0x14000 0x40000200 tmoslp softclock 16896 149689 0 0 3 0x14000 0x40000200 idle0 1 301414 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &sched_lock r = 0 (0xffffffff83af8540) #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 (0xffff800045fefb50) #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 70003 (systqmp) thread 0xffff800045ffe000 (240013) shared rwlock systqmp r = 0 (0xffffffff839ce5b8) #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11052 12086K 12143K 166960K 12161 0 pcb 18 12K 12K 166960K 39 0 rtable 217 6K 7K 166960K 392 0 pf 32 17K 24K 166960K 74 0 ifaddr 40 7K 7K 166960K 50 0 ifgroup 51 2K 2K 166960K 59 0 sysctl 1 1K 9K 166960K 6 0 counters 68 36K 37K 166960K 72 0 ioctlops 0 0K 4K 166960K 1494 0 iov 0 0K 16K 166960K 2 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1294 81K 81K 166960K 1401 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 6 0K 0K 166960K 6 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 93K 166960K 205 0 proc 75 131K 180K 166960K 607 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 3 0 in_multi 88 5K 6K 166960K 110 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 43 201K 201K 166960K 43 0 exec 0 0K 1K 166960K 398 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 230 181K 183K 166960K 3616 0 UVM aobj 72 10K 10K 166960K 74 0 pinsyscall 41 82K 106K 166960K 1391 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 13 0K 2K 166960K 31 0 temp 35 9114K 9120K 166960K 3787 0 kqueue 14 22K 24K 166960K 31 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 45 0 40 1 0 1 1 0 8 0 rtentry 176 126 0 26 6 0 6 6 0 8 0 unpcb 144 64 0 45 1 0 1 1 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 17 0 13 1 0 1 1 0 8 0 arp 136 21 0 4 1 0 1 1 0 8 0 inpcb 328 109 0 102 1 0 1 1 0 8 0 nd6 152 27 0 6 1 0 1 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 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 pfanchor 1288 5 0 5 1 0 1 1 0 8 1 pfstitem 24 30 0 0 1 0 1 1 0 8 0 pfstkey 128 30 0 0 1 0 1 1 0 8 0 pfstate 448 30 0 0 4 0 4 4 0 8 0 pfrule 1360 22 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 500 0 44 29 0 29 29 0 8 0 art_table 40 501 0 44 5 0 5 5 0 8 0 art_node 32 126 0 26 1 0 1 1 0 8 0 semapl 72 4 0 0 1 0 1 1 0 8 0 shmpl 120 71 0 2 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1643 0 169 93 0 93 93 0 8 0 ffsino 296 1643 0 169 114 0 114 114 0 8 0 nchpl 144 1909 0 201 64 0 64 64 0 8 0 vnodes 216 1767 0 0 99 0 99 99 0 8 0 namei 1024 6867 0 6867 4 1 3 3 0 8 3 percpumem 16 52 0 2 1 0 1 1 0 8 0 kstatmem 264 29 0 4 2 0 2 2 0 8 0 scxspl 216 6588 0 6588 3 2 1 3 1 8 1 plimitpl 152 38 0 20 1 0 1 1 0 8 0 sigapl 424 518 0 472 7 0 7 7 0 8 1 knotepl 120 52 0 0 2 0 2 2 0 8 0 kqueuepl 224 37 0 25 1 0 1 1 0 8 0 pipepl 344 135 0 107 3 0 3 3 0 8 0 fdescpl 528 502 0 472 3 0 3 3 0 8 0 filepl 160 1868 0 1646 10 0 10 10 0 8 0 lockfpl 104 14 0 10 1 0 1 1 0 8 0 lockfspl 48 9 0 5 1 0 1 1 0 8 0 sessionpl 144 94 0 85 1 0 1 1 0 8 0 pgrppl 48 104 0 87 1 0 1 1 0 8 0 ucredpl 104 113 0 99 1 0 1 1 0 8 0 zombiepl 144 472 0 472 1 0 1 1 0 8 1 processpl 1240 518 0 472 5 0 5 5 0 8 1 procpl 664 605 0 549 6 0 6 6 0 8 0 sockpl 752 222 0 190 4 0 4 4 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 133 0 0 17 0 17 17 0 8 0 mcl2k 2048 30 0 0 4 0 4 4 0 8 0 mextrefs 64 29 0 0 1 0 1 1 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 216 0 0 14 0 14 14 0 8 0 bufpl 272 2347 0 105 150 0 150 150 0 8 0 anonpl 32 3803 0 0 31 0 31 31 0 247 0 amapchunkpl 152 10080 0 9425 29 0 29 29 0 158 1 amappl16 200 1767 0 1751 5 2 3 5 0 8 2 amappl15 192 18 0 18 2 2 0 1 0 8 0 amappl14 184 445 0 443 1 0 1 1 0 8 0 amappl13 176 134 0 122 1 0 1 1 0 8 0 amappl12 168 762 0 733 2 0 2 2 0 8 0 amappl11 160 76 0 76 1 1 0 1 0 8 0 amappl10 152 69 0 55 1 0 1 1 0 8 0 amappl9 144 321 0 321 1 1 0 1 0 8 0 amappl8 136 102 0 100 1 0 1 1 0 8 0 amappl7 128 165 0 152 1 0 1 1 0 8 0 amappl6 120 172 0 171 1 0 1 1 0 8 0 amappl5 112 112 0 102 1 0 1 1 0 8 0 amappl4 104 298 0 277 1 0 1 1 0 8 0 amappl3 96 1736 0 1645 3 0 3 3 0 8 0 amappl2 88 616 0 539 2 0 2 2 0 8 0 amappl1 80 10681 0 10080 15 1 14 15 0 8 1 amappl 88 2863 0 2706 5 0 5 5 0 92 0 uvmvnodes 80 103 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 73 0 2 2 0 2 2 0 8 0 uaddrrnd 24 502 0 472 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 502 0 472 1 0 1 1 0 8 0 vmmpekpl 168 6156 0 6111 3 0 3 3 0 8 0 vmmpepl 168 41736 0 39883 87 0 87 87 0 357 3 vmsppl 488 501 0 472 5 0 5 5 0 8 0 rwobjpl 80 15265 0 14186 23 0 23 23 0 8 0 pdppl 4096 1011 0 944 99 26 73 85 0 8 6 pvpl 32 9575 0 0 80 2 78 78 0 265 0 pmappl 256 501 0 472 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 429 0 30 12 0 12 12 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834ca0a4) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff835066cc,ffffffff83472cbf,643,ffffffff83454f67) at __assert+0x29 sys/kern/subr_prf.c:-1 process_stop(ffff800045fefa38,8000000,1) at process_stop+0x3fe cursig(ffff80002a3494e8,ffff800033bac248,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline] cursig(ffff80002a3494e8,ffff800033bac248,0) at cursig+0x509 sys/kern/kern_sig.c:1446 userret(ffff80002a3494e8) at userret+0x203 sys/kern/kern_sig.c:2208 syscall(ffff800033bac380) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff800033bac380) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:812 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2314190b660, count: -8 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff80002999dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 end of kernel end trace frame: 0x74495c5b69b0, count: 12 ddb{1}> trace x86_ipi_db(ffff80002999dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 end of kernel end trace frame: 0x74495c5b69b0, count: -3