================================================================================
UBSAN: Undefined behaviour in arch/x86/kernel/uprobes.c:276:56
index 4 is out of range for type 'insn_byte_t [4]'
CPU: 0 PID: 8461 Comm: syz-executor.5 Not tainted 4.19.150-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x22c/0x33e lib/dump_stack.c:118
 ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
 __ubsan_handle_out_of_bounds.cold+0x63/0x6f lib/ubsan.c:383
 is_prefix_bad arch/x86/kernel/uprobes.c:276 [inline]
 uprobe_init_insn arch/x86/kernel/uprobes.c:299 [inline]
 arch_uprobe_analyze_insn+0x9d8/0xaa0 arch/x86/kernel/uprobes.c:868
 prepare_uprobe kernel/events/uprobes.c:611 [inline]
 install_breakpoint kernel/events/uprobes.c:654 [inline]
 uprobe_mmap+0x8c2/0xa70 kernel/events/uprobes.c:1096
 mmap_region+0x552/0x1510 mm/mmap.c:1803
 do_mmap+0x8e8/0x1080 mm/mmap.c:1530
 do_mmap_pgoff include/linux/mm.h:2326 [inline]
 vm_mmap_pgoff+0x197/0x200 mm/util.c:357
 ksys_mmap_pgoff+0x2d1/0x660 mm/mmap.c:1580
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45de59
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ff8d5980c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000021400 RCX: 000000000045de59
RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020007000
RBP: 000000000118bf78 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000412 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffc5839b50f R14: 00007ff8d59819c0 R15: 000000000118bf2c
================================================================================
x_tables: duplicate underflow at hook 3
x_tables: duplicate underflow at hook 2
tmpfs: Bad mount option fsmagic
tmpfs: Bad mount option fsmagic
x_tables: duplicate underflow at hook 3
tmpfs: No value for mount option 'euid<00000000000000000000'
tmpfs: No value for mount option 'euid<00000000000000000000'
audit: type=1400 audit(1602404872.127:14): avc:  denied  { write } for  pid=8805 comm="syz-executor.4" path="socket:[32456]" dev="sockfs" ino=32456 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=dccp_socket permissive=1
x_tables: duplicate underflow at hook 2
x_tables: duplicate underflow at hook 2
FAT-fs (loop3): Directory bread(block 6) failed
x_tables: duplicate underflow at hook 2
tmpfs: No value for mount option 'È'
tmpfs: No value for mount option 'È'
x_tables: duplicate underflow at hook 2
x_tables: duplicate underflow at hook 1
x_tables: duplicate underflow at hook 3
x_tables: duplicate underflow at hook 2
tmpfs: Bad value '0xffffffffffffffff' for mount option 'uid'
tmpfs: Bad value '0xffffffffffffffff' for mount option 'uid'
squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on loop1
x_tables: duplicate underflow at hook 1
squashfs: SQUASHFS error: Can't find a SQUASHFS superblock on loop1
x_tables: duplicate underflow at hook 3