================================================================== BUG: KASAN: double-free in kfree+0xb8/0x19c mm/slab_common.c:1015 Free of addr ffff00013fc48000 by task syz-executor.1/6022 CPU: 0 PID: 6022 Comm: syz-executor.1 Not tainted 6.4.0-rc7-syzkaller-ge40939bbfc68 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:351 [inline] print_report+0x174/0x514 mm/kasan/report.c:462 kasan_report_invalid_free+0xc4/0x114 mm/kasan/report.c:537 ____kasan_slab_free+0x170/0x1c0 mm/kasan/common.c:225 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3786 [inline] __kmem_cache_free+0x2a8/0x49c mm/slub.c:3799 kfree+0xb8/0x19c mm/slab_common.c:1015 diUnmount+0xf4/0x10c fs/jfs/jfs_imap.c:195 jfs_umount+0x15c/0x360 fs/jfs/jfs_umount.c:63 jfs_put_super+0x90/0x188 fs/jfs/super.c:194 generic_shutdown_super+0x130/0x328 fs/super.c:500 kill_block_super+0x70/0xdc fs/super.c:1407 deactivate_locked_super+0xac/0x124 fs/super.c:331 deactivate_super+0xe0/0x100 fs/super.c:362 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1177 __cleanup_mnt+0x20/0x30 fs/namespace.c:1184 task_work_run+0x230/0x2e0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2180/0x3c90 arch/arm64/kernel/signal.c:1305 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:144 [inline] el0_svc+0x94/0x160 arch/arm64/kernel/entry-common.c:648 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Allocated by task 6022: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:510 __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook+0x80/0x488 mm/slab.h:711 slab_alloc_node mm/slub.c:3451 [inline] slab_alloc mm/slub.c:3459 [inline] __kmem_cache_alloc_lru mm/slub.c:3466 [inline] kmem_cache_alloc+0x2a4/0x434 mm/slub.c:3475 getname_flags+0xd0/0x480 fs/namei.c:140 user_path_at_empty+0x40/0x1a4 fs/namei.c:2906 user_path_at include/linux/namei.h:57 [inline] ksys_umount fs/namespace.c:1824 [inline] __do_sys_umount fs/namespace.c:1832 [inline] __se_sys_umount fs/namespace.c:1830 [inline] __arm64_sys_umount+0xf8/0x17c fs/namespace.c:1830 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x244 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:191 el0_svc+0x4c/0x160 arch/arm64/kernel/entry-common.c:647 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Freed by task 6022: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:521 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook mm/slub.c:1807 [inline] slab_free mm/slub.c:3786 [inline] kmem_cache_free+0x2dc/0x56c mm/slub.c:3808 putname fs/namei.c:273 [inline] user_path_at_empty+0x148/0x1a4 fs/namei.c:2909 user_path_at include/linux/namei.h:57 [inline] ksys_umount fs/namespace.c:1824 [inline] __do_sys_umount fs/namespace.c:1832 [inline] __se_sys_umount fs/namespace.c:1830 [inline] __arm64_sys_umount+0xf8/0x17c fs/namespace.c:1830 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x244 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:191 el0_svc+0x4c/0x160 arch/arm64/kernel/entry-common.c:647 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 The buggy address belongs to the object at ffff00013fc48000 which belongs to the cache names_cache of size 4096 The buggy address is located 0 bytes inside of 4096-byte region [ffff00013fc48000, ffff00013fc49000) The buggy address belongs to the physical page: page:00000000b8637e9d refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x17fc48 head:00000000b8637e9d order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 05ffc00000010200 ffff0000c184c600 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff00013fc47f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff00013fc47f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff00013fc48000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff00013fc48080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff00013fc48100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================