================================================================== BUG: KASAN: out-of-bounds in unwind_next_frame+0xcd/0xe0 arch/x86/kernel/unwind_frame.c:51 Read of size 8 at addr ffff8801cfbe7dd0 by task syz-executor1/6091 CPU: 0 PID: 6091 Comm: syz-executor1 Not tainted 4.9.93-gf6bec4e #4 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d04777a8 ffffffff81d9c299 ffffea00073ef9c0 ffff8801cfbe7dd0 0000000000000000 ffff8801cfbe7dd8 ffff8801cfe1f000 ffff8801d04777e0 ffffffff8156534b ffff8801cfbe7dd0 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+0xac/0x2f5 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:467 [] proc_single_show+0xfd/0x170 fs/proc/base.c:769 [] 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] [] compat_do_readv_writev+0x567/0x7a0 fs/read_write.c:1091 [] compat_readv+0xe2/0x150 fs/read_write.c:1120 [] do_compat_readv+0xf2/0x1d0 fs/read_write.c:1140 [] C_SYSC_readv fs/read_write.c:1152 [inline] [] compat_SyS_readv+0x26/0x30 fs/read_write.c:1148 [] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline] [] do_fast_syscall_32+0x2f7/0x870 arch/x86/entry/common.c:387 [] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137 The buggy address belongs to the page: page:ffffea00073ef9c0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x8000000000000000() page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801cfbe7c80: 00 f2 f2 f2 f3 f3 f3 f3 00 00 00 00 00 00 00 00 ffff8801cfbe7d00: 00 00 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 00 >ffff8801cfbe7d80: 00 00 00 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 ^ ffff8801cfbe7e00: 00 00 00 f1 f1 f1 f1 00 00 f2 f2 f2 f2 f2 f2 00 ffff8801cfbe7e80: 00 f2 f2 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================