================================================================== BUG: KASAN: stack-out-of-bounds in unwind_get_return_address+0x92/0xa0 arch/x86/kernel/unwind_frame.c:17 Read of size 8 at addr ffff8801b595f96a by task syz-executor7/28264 CPU: 0 PID: 28264 Comm: syz-executor7 Not tainted 4.9.83-g74659dc #49 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d53d7b50 ffffffff81d95149 ffffea0006d657c0 ffff8801b595f96a 0000000000000000 ffff8801b595f96a 0000000000000000 ffff8801d53d7b88 ffffffff8153e213 ffff8801b595f96a 0000000000000008 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_address_description+0x73/0x280 mm/kasan/report.c:252 [] kasan_report_error mm/kasan/report.c:351 [inline] [] kasan_report+0x275/0x360 mm/kasan/report.c:408 [] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429 [] unwind_get_return_address+0x92/0xa0 arch/x86/kernel/unwind_frame.c:17 [] __save_stack_trace+0x8d/0xf0 arch/x86/kernel/stacktrace.c:43 [] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71 [] proc_pid_stack+0x146/0x230 fs/proc/base.c:466 [] proc_single_show+0xf8/0x170 fs/proc/base.c:768 [] traverse+0x231/0x900 fs/seq_file.c:124 [] seq_lseek+0x136/0x3c0 fs/seq_file.c:337 [] vfs_llseek fs/read_write.c:301 [inline] [] SYSC_lseek fs/read_write.c:314 [inline] [] SyS_lseek fs/read_write.c:305 [inline] [] C_SYSC_lseek fs/read_write.c:326 [inline] [] compat_SyS_lseek+0xeb/0x170 fs/read_write.c:324 [] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline] [] do_fast_syscall_32+0x2f5/0x870 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:ffffea0006d657c0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x8000000000000000() page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801b595f800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801b595f880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801b595f900: 00 00 f1 f1 f1 f1 00 f2 f2 f2 f3 f3 f3 f3 00 00 ^ ffff8801b595f980: 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 ffff8801b595fa00: f1 00 f2 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00 ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 28264 Comm: syz-executor7 Tainted: G B 4.9.83-g74659dc #49 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d53d7aa8 ffffffff81d95149 ffffffff8419777f ffff8801d53d7b80 0000000000000000 ffff8801b595f96a 0000000000000000 ffff8801d53d7b70 ffffffff8142f6c1 0000000041b58ab3 ffffffff8418b1f0 ffffffff8142f505 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] panic+0x1bc/0x3a8 kernel/panic.c:179 [] kasan_end_report+0x50/0x50 mm/kasan/report.c:176 [] kasan_report_error mm/kasan/report.c:356 [inline] [] kasan_report+0x167/0x360 mm/kasan/report.c:408 [] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429 [] unwind_get_return_address+0x92/0xa0 arch/x86/kernel/unwind_frame.c:17 [] __save_stack_trace+0x8d/0xf0 arch/x86/kernel/stacktrace.c:43 [] save_stack_trace_tsk+0x48/0x70 arch/x86/kernel/stacktrace.c:71 [] proc_pid_stack+0x146/0x230 fs/proc/base.c:466 [] proc_single_show+0xf8/0x170 fs/proc/base.c:768 [] traverse+0x231/0x900 fs/seq_file.c:124 [] seq_lseek+0x136/0x3c0 fs/seq_file.c:337 [] vfs_llseek fs/read_write.c:301 [inline] [] SYSC_lseek fs/read_write.c:314 [inline] [] SyS_lseek fs/read_write.c:305 [inline] [] C_SYSC_lseek fs/read_write.c:326 [inline] [] compat_SyS_lseek+0xeb/0x170 fs/read_write.c:324 [] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline] [] do_fast_syscall_32+0x2f5/0x870 arch/x86/entry/common.c:387 [] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..