================================================================== BUG: KASAN: out-of-bounds in unwind_next_frame+0xcd/0xe0 arch/x86/kernel/unwind_frame.c:51 Read of size 8 at addr ffff8801a34df838 by task syz-executor5/19246 CPU: 1 PID: 19246 Comm: syz-executor5 Not tainted 4.9.118-g856452b #21 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801ca7ef7b8 ffffffff81eb4b89 ffffea00068d37c0 ffff8801a34df838 0000000000000000 ffff8801a34df840 ffff8801bcb69280 ffff8801ca7ef7f0 ffffffff81567f29 ffff8801a34df838 0000000000000008 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_address_description+0x6c/0x234 mm/kasan/report.c:256 [] kasan_report_error mm/kasan/report.c:355 [inline] [] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412 [] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 [] unwind_next_frame+0xcd/0xe0 arch/x86/kernel/unwind_frame.c:51 [] __save_stack_trace+0x7d/0xf0 arch/x86/kernel/stacktrace.c:42 [] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71 [] proc_pid_stack+0x148/0x220 fs/proc/base.c:469 [] proc_single_show+0xfd/0x170 fs/proc/base.c:771 [] seq_read+0x4b6/0x12e0 fs/seq_file.c:240 [] do_loop_readv_writev.part.18+0xd5/0x280 fs/read_write.c:718 [] do_loop_readv_writev fs/read_write.c:707 [inline] [] do_readv_writev+0x565/0x7a0 fs/read_write.c:873 [] vfs_readv+0x84/0xc0 fs/read_write.c:897 [] do_preadv+0x197/0x240 fs/read_write.c:974 [] SYSC_preadv fs/read_write.c:1024 [inline] [] SyS_preadv+0x30/0x40 fs/read_write.c:1019 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb The buggy address belongs to the page: page:ffffea00068d37c0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x8000000000000000() page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801a34df700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801a34df780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801a34df800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8801a34df880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801a34df900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================