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BUG: KASAN: stack-out-of-bounds in pgd_val arch/x86/include/asm/paravirt.h:414 [inline]
BUG: KASAN: stack-out-of-bounds in p4d_page_vaddr arch/x86/include/asm/pgtable.h:895 [inline]
BUG: KASAN: stack-out-of-bounds in pud_offset arch/x86/include/asm/pgtable.h:907 [inline]
BUG: KASAN: stack-out-of-bounds in vmalloc_fault+0x6d0/0x770 arch/x86/mm/fault.c:397
Read of size 8 at addr ffff8881da96cff8 by task syz-executor3/25382
PANIC: double fault, error_code: 0x0

CPU: 1 PID: 25382 Comm: syz-executor3 Not tainted 4.20.0-rc3+ #315
CPU: 0 PID: 25373 Comm: syz-executor5 Not tainted 4.20.0-rc3+ #315
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
RIP: 0010:__udp4_lib_lookup+0x25/0x870 net/ipv4/udp.c:466
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x244/0x39d lib/dump_stack.c:113
Code: ff 0f 1f 40 00 55 48 89 e5 41 57 41 56 41 55 49 bd 00 00 00 00 00 fc ff df 41 54 53 44 89 c3 48 81 ec 00 01 00 00 48 8b 45 20 <48> 89 bd 28 ff ff ff 66 c1 c3 08 4c 8b 65 18 89 b5 1c ff ff ff 89
RSP: 0018:ffff8881d9a8af98 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000faa RCX: 00000000111414ac
RDX: 000000000000224e RSI: 00000000aa1414ac RDI: ffff88819b1f81c0
RBP: ffff8881d9a8b0c0 R08: 0000000000000faa R09: 0000000000000001
 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256
R10: 0000000000000000 R11: ffff8881dae2db3b R12: ffff8881cef5da80
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412
R13: dffffc0000000000 R14: ffff8881cef5da6c R15: 0000000000000003
FS:  00007fa78ace8700(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 pgd_val arch/x86/include/asm/paravirt.h:414 [inline]
 p4d_page_vaddr arch/x86/include/asm/pgtable.h:895 [inline]
 pud_offset arch/x86/include/asm/pgtable.h:907 [inline]
 vmalloc_fault+0x6d0/0x770 arch/x86/mm/fault.c:397
CR2: ffff8881d9a8af88 CR3: 0000000196ec5000 CR4: 00000000001406f0
 do_kern_addr_fault arch/x86/mm/fault.c:1203 [inline]
 __do_page_fault+0x860/0xe60 arch/x86/mm/fault.c:1487
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 do_page_fault+0xf2/0x7e0 arch/x86/mm/fault.c:1520
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace: