NILFS (loop5): discard dirty block: blocknr=0, size=4096 NILFS (loop5): discard dirty page: offset=61440, ino=15 NILFS (loop5): discard dirty block: blocknr=0, size=4096 NILFS (loop5): discard dirty page: offset=8192, ino=6 NILFS (loop5): discard dirty block: blocknr=25, size=4096 NILFS (loop5): disposed unprocessed dirty file(s) when detaching log writer ================================================================== BUG: KASAN: slab-use-after-free in nilfs_load_inode_block+0x11e/0x280 fs/nilfs2/inode.c:1030 Read of size 8 at addr ffff888020de4230 by task syz-executor.5/5033 CPU: 1 PID: 5033 Comm: syz-executor.5 Not tainted 6.4.0-rc6-syzkaller-00037-gb6dad5178cea #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:351 [inline] print_report+0x163/0x540 mm/kasan/report.c:462 kasan_report+0x176/0x1b0 mm/kasan/report.c:572 nilfs_load_inode_block+0x11e/0x280 fs/nilfs2/inode.c:1030 __nilfs_mark_inode_dirty+0xa5/0x280 fs/nilfs2/inode.c:1107 nilfs_dirty_inode+0x164/0x200 fs/nilfs2/inode.c:1148 __mark_inode_dirty+0x305/0xd90 fs/fs-writeback.c:2424 mark_inode_dirty_sync include/linux/fs.h:2149 [inline] iput+0x1f2/0x8f0 fs/inode.c:1770 nilfs_dispose_list+0x51d/0x5c0 fs/nilfs2/segment.c:816 nilfs_detach_log_writer+0xaf1/0xbb0 fs/nilfs2/segment.c:2852 nilfs_put_super+0x4d/0x160 fs/nilfs2/super.c:477 generic_shutdown_super+0x134/0x340 fs/super.c:500 kill_block_super+0x84/0xf0 fs/super.c:1407 deactivate_locked_super+0xa4/0x110 fs/super.c:331 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1177 task_work_run+0x24a/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:297 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fa2fba8d607 Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffd9927428 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fa2fba8d607 RDX: 00007fffd99274f9 RSI: 000000000000000a RDI: 00007fffd99274f0 RBP: 00007fffd99274f0 R08: 00000000ffffffff R09: 00007fffd99272c0 R10: 00005555563a7873 R11: 0000000000000246 R12: 00007fa2fbae6cdc R13: 00007fffd99285b0 R14: 00005555563a7810 R15: 00007fffd99285f0 Allocated by task 19975: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] nilfs_find_or_create_root+0x137/0x4e0 fs/nilfs2/the_nilfs.c:851 nilfs_attach_checkpoint+0x123/0x4d0 fs/nilfs2/super.c:529 nilfs_fill_super+0x321/0x600 fs/nilfs2/super.c:1074 nilfs_mount+0x67d/0x9a0 fs/nilfs2/super.c:1326 legacy_get_tree+0xef/0x190 fs/fs_context.c:610 vfs_get_tree+0x8c/0x270 fs/super.c:1510 do_new_mount+0x28f/0xae0 fs/namespace.c:3039 do_mount fs/namespace.c:3382 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5033: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:521 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 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+0x264/0x3c0 mm/slub.c:3799 nilfs_segctor_destroy fs/nilfs2/segment.c:2775 [inline] nilfs_detach_log_writer+0x8c1/0xbb0 fs/nilfs2/segment.c:2838 nilfs_put_super+0x4d/0x160 fs/nilfs2/super.c:477 generic_shutdown_super+0x134/0x340 fs/super.c:500 kill_block_super+0x84/0xf0 fs/super.c:1407 deactivate_locked_super+0xa4/0x110 fs/super.c:331 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1177 task_work_run+0x24a/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:297 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888020de4200 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 48 bytes inside of freed 256-byte region [ffff888020de4200, ffff888020de4300) The buggy address belongs to the physical page: page:ffffea0000837900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x20de4 head:ffffea0000837900 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888012441b40 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 6214, tgid 6214 (syz-executor.2), ts 317788558859, free_ts 317560511924 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1731 prep_new_page mm/page_alloc.c:1738 [inline] get_page_from_freelist+0x321c/0x33a0 mm/page_alloc.c:3502 __alloc_pages+0x255/0x670 mm/page_alloc.c:4768 alloc_slab_page+0x6a/0x160 mm/slub.c:1851 allocate_slab mm/slub.c:1998 [inline] new_slab+0x84/0x2f0 mm/slub.c:2051 ___slab_alloc+0xa85/0x10a0 mm/slub.c:3192 __slab_alloc mm/slub.c:3291 [inline] __slab_alloc_node mm/slub.c:3344 [inline] slab_alloc_node mm/slub.c:3441 [inline] __kmem_cache_alloc_node+0x1b8/0x290 mm/slub.c:3490 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1057 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] smk_fetch+0x92/0x140 security/smack/smack_lsm.c:291 smack_d_instantiate+0x8d7/0xb40 security/smack/smack_lsm.c:3518 security_d_instantiate+0x9b/0xf0 security/security.c:3760 d_instantiate_new+0x65/0x120 fs/dcache.c:2053 ext4_add_nondir+0x22d/0x290 fs/ext4/namei.c:2797 ext4_symlink+0x908/0xb30 fs/ext4/namei.c:3431 vfs_symlink+0x12f/0x2a0 fs/namei.c:4475 do_symlinkat+0x201/0x610 fs/namei.c:4501 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1302 [inline] free_unref_page_prepare+0x903/0xa30 mm/page_alloc.c:2564 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2659 qlist_free_all+0x22/0x60 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook+0x68/0x3a0 mm/slab.h:711 kmem_cache_alloc_bulk+0x3d2/0x4b0 mm/slub.c:4033 mt_alloc_bulk lib/maple_tree.c:164 [inline] mas_alloc_nodes+0x3df/0x800 lib/maple_tree.c:1309 mas_node_count_gfp lib/maple_tree.c:1367 [inline] mas_preallocate+0x131/0x350 lib/maple_tree.c:5775 vma_iter_prealloc mm/internal.h:1029 [inline] __split_vma+0x1e0/0x7f0 mm/mmap.c:2253 mprotect_fixup+0x5c5/0xa50 mm/mprotect.c:692 do_mprotect_pkey+0x8b0/0xdb0 mm/mprotect.c:860 __do_sys_mprotect mm/mprotect.c:881 [inline] __se_sys_mprotect mm/mprotect.c:878 [inline] __x64_sys_mprotect+0x80/0x90 mm/mprotect.c:878 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff888020de4100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888020de4180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888020de4200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888020de4280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888020de4300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================