================================================================== BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x1360/0x17d0 arch/x86/kernel/unwind_orc.c:470 Read of size 8 at addr ffff888056e1fe68 by task syz-executor.0/10420 CPU: 0 PID: 10420 Comm: syz-executor.0 Not tainted 4.14.307-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:251 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:350 kasan_report mm/kasan/report.c:408 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:429 unwind_next_frame+0x1360/0x17d0 arch/x86/kernel/unwind_orc.c:470 __save_stack_trace+0x90/0x160 arch/x86/kernel/stacktrace.c:44 save_stack_trace_tsk+0x34/0x40 arch/x86/kernel/stacktrace.c:73 proc_pid_stack+0x1b2/0x2f0 fs/proc/base.c:459 proc_single_show+0xe7/0x150 fs/proc/base.c:761 seq_read+0x4e4/0x1180 fs/seq_file.c:240 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3eb/0x5b0 fs/read_write.c:919 vfs_readv+0xc8/0x120 fs/read_write.c:981 do_preadv fs/read_write.c:1065 [inline] SYSC_preadv fs/read_write.c:1115 [inline] SyS_preadv+0x15a/0x200 fs/read_write.c:1110 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 RIP: 0033:0x7f6bf68680f9 RSP: 002b:00007f6bf4dda168 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00007f6bf6987f80 RCX: 00007f6bf68680f9 RDX: 0000000000000218 RSI: 00000000200017c0 RDI: 0000000000000005 RBP: 00007f6bf68c3ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffdb79abff R14: 00007f6bf4dda300 R15: 0000000000022000 The buggy address belongs to the page: page:ffffea00015b87c0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0xfff00000000000() raw: 00fff00000000000 0000000000000000 0000000000000000 00000000ffffffff raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888056e1fd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888056e1fd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888056e1fe00: 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 ^ ffff888056e1fe80: f1 00 00 f3 f3 00 00 00 00 00 00 00 00 00 00 00 ffff888056e1ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================