================================================================== BUG: KASAN: double-free or invalid-free in putname+0xee/0x130 fs/namei.c:258 CPU: 1 PID: 13445 Comm: kworker/u4:15 Not tainted 4.16.0-rc6+ #284 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_invalid_free+0x55/0x80 mm/kasan/report.c:336 __kasan_slab_free+0x145/0x170 mm/kasan/kasan.c:500 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527 __cache_free mm/slab.c:3485 [inline] kmem_cache_free+0x83/0x2a0 mm/slab.c:3743 putname+0xee/0x130 fs/namei.c:258 open_exec+0x41/0x60 fs/exec.c:882 load_elf_binary+0x1348/0x4c10 fs/binfmt_elf.c:775 search_binary_handler+0x142/0x6b0 fs/exec.c:1638 exec_binprm fs/exec.c:1680 [inline] do_execveat_common.isra.30+0x1754/0x23c0 fs/exec.c:1802 do_execve+0x31/0x40 fs/exec.c:1847 call_usermodehelper_exec_async+0x457/0x8f0 kernel/umh.c:100 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406 Allocated by task 13422: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3541 getname_flags+0xcb/0x580 fs/namei.c:138 getname fs/namei.c:209 [inline] SYSC_symlinkat fs/namei.c:4121 [inline] SyS_symlinkat fs/namei.c:4112 [inline] SYSC_symlink fs/namei.c:4145 [inline] SyS_symlink+0x7d/0x240 fs/namei.c:4143 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 13422: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527 __cache_free mm/slab.c:3485 [inline] kmem_cache_free+0x83/0x2a0 mm/slab.c:3743 putname+0xee/0x130 fs/namei.c:258 SYSC_symlinkat fs/namei.c:4139 [inline] SyS_symlinkat fs/namei.c:4112 [inline] SYSC_symlink fs/namei.c:4145 [inline] SyS_symlink+0x14e/0x240 fs/namei.c:4143 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff88016552a180 which belongs to the cache names_cache of size 4096 The buggy address is located 128 bytes inside of 4096-byte region [ffff88016552a180, ffff88016552b180) The buggy address belongs to the page: page:ffffea0005954a80 count:1 mapcount:0 mapping:ffff88016552a180 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff88016552a180 0000000000000000 0000000100000001 raw: ffffea00051e2220 ffffea00050b1c20 ffff8801da5da600 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88016552a100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88016552a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88016552a200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88016552a280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88016552a300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================