loop5: detected capacity change from 0 to 77 ================================================================== BUG: KASAN: use-after-free in d_inode include/linux/dcache.h:516 [inline] BUG: KASAN: use-after-free in relay_switch_subbuf+0x837/0x900 kernel/relay.c:676 Read of size 8 at addr ffff888074f63c50 by task syz-executor.5/12350 CPU: 0 PID: 12350 Comm: syz-executor.5 Not tainted 5.19.0-rc4-next-20220628-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report+0xbe/0x1f0 mm/kasan/report.c:495 d_inode include/linux/dcache.h:516 [inline] relay_switch_subbuf+0x837/0x900 kernel/relay.c:676 relay_reserve include/linux/relay.h:248 [inline] trace_note+0x5af/0x720 kernel/trace/blktrace.c:95 trace_note_tsk kernel/trace/blktrace.c:126 [inline] __blk_add_trace+0xbfb/0xdf0 kernel/trace/blktrace.c:267 blk_add_trace_bio+0x326/0x4f0 kernel/trace/blktrace.c:905 trace_block_bio_queue include/trace/events/block.h:355 [inline] submit_bio_noacct+0x13ff/0x1b30 block/blk-core.c:843 submit_bio block/blk-core.c:901 [inline] submit_bio+0xd7/0x300 block/blk-core.c:873 submit_bh_wbc+0x4bc/0x670 fs/buffer.c:2718 submit_bh fs/buffer.c:2724 [inline] block_read_full_folio+0x6f5/0xa30 fs/buffer.c:2340 filemap_read_folio+0x3c/0x1d0 mm/filemap.c:2390 do_read_cache_folio+0x251/0x5b0 mm/filemap.c:3515 read_mapping_folio include/linux/pagemap.h:762 [inline] read_part_sector+0xf6/0x440 block/partitions/core.c:715 adfspart_check_ICS+0x9a/0x890 block/partitions/acorn.c:360 check_partition block/partitions/core.c:147 [inline] blk_add_partitions block/partitions/core.c:600 [inline] bdev_disk_changed block/partitions/core.c:686 [inline] bdev_disk_changed+0x629/0xf60 block/partitions/core.c:653 blkdev_get_whole+0x18a/0x2d0 block/bdev.c:686 blkdev_get_by_dev.part.0+0x5ec/0xb90 block/bdev.c:823 blkdev_get_by_dev block/bdev.c:891 [inline] blkdev_get_by_path+0x1b3/0x2e0 block/bdev.c:888 mount_bdev+0x5b/0x450 fs/super.c:1327 legacy_get_tree+0x105/0x220 fs/fs_context.c:610 vfs_get_tree+0x89/0x2f0 fs/super.c:1501 do_new_mount fs/namespace.c:3040 [inline] path_mount+0x1320/0x1fa0 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f7147e8a72a Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 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:00007f714908ff88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000300 RCX: 00007f7147e8a72a RDX: 0000000020000100 RSI: 0000000020000180 RDI: 00007f714908ffe0 RBP: 00007f7149090020 R08: 00007f7149090020 R09: 0000000020000100 R10: 0000000000000004 R11: 0000000000000206 R12: 0000000020000100 R13: 0000000020000180 R14: 00007f714908ffe0 R15: 0000000020000380 Allocated by task 11089: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:736 [inline] slab_alloc_node mm/slub.c:3243 [inline] slab_alloc mm/slub.c:3251 [inline] __kmem_cache_alloc_lru mm/slub.c:3258 [inline] kmem_cache_alloc_lru+0x376/0x720 mm/slub.c:3275 __d_alloc+0x32/0x960 fs/dcache.c:1769 d_alloc_pseudo+0x19/0x70 fs/dcache.c:1899 alloc_file_pseudo+0xc6/0x250 fs/file_table.c:262 __shmem_file_setup mm/shmem.c:4103 [inline] __shmem_file_setup+0x144/0x310 mm/shmem.c:4077 __do_sys_memfd_create+0x1c6/0x4e0 mm/memfd.c:321 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 call_rcu+0x99/0x790 kernel/rcu/tree.c:2793 dentry_free+0xc3/0x160 fs/dcache.c:377 __dentry_kill+0x4cb/0x640 fs/dcache.c:621 dentry_kill fs/dcache.c:745 [inline] dput+0x64d/0xdb0 fs/dcache.c:913 find_next_child fs/libfs.c:264 [inline] simple_recursive_removal+0x136/0x830 fs/libfs.c:279 debugfs_remove fs/debugfs/inode.c:742 [inline] debugfs_remove+0x59/0x80 fs/debugfs/inode.c:736 shrinker_debugfs_remove+0xb1/0x160 mm/shrinker_debug.c:258 unregister_shrinker mm/vmscan.c:728 [inline] unregister_shrinker+0x1cd/0x300 mm/vmscan.c:718 mb_cache_destroy+0x24/0x420 fs/mbcache.c:396 ext4_xattr_destroy_cache+0x1b/0x30 fs/ext4/xattr.c:3124 ext4_put_super+0x890/0x1160 fs/ext4/super.c:1294 generic_shutdown_super+0x14c/0x400 fs/super.c:462 kill_block_super+0x97/0xf0 fs/super.c:1398 deactivate_locked_super+0x94/0x160 fs/super.c:332 deactivate_super+0xad/0xd0 fs/super.c:363 cleanup_mnt+0x3a2/0x540 fs/namespace.c:1186 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Second to last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 call_rcu+0x99/0x790 kernel/rcu/tree.c:2793 dentry_free+0xc3/0x160 fs/dcache.c:377 __dentry_kill+0x4cb/0x640 fs/dcache.c:621 shrink_dentry_list+0x23c/0x800 fs/dcache.c:1201 shrink_dcache_parent+0x1fe/0x3c0 fs/dcache.c:1628 vfs_rmdir.part.0+0x272/0x5a0 fs/namei.c:4065 vfs_rmdir fs/namei.c:4046 [inline] do_rmdir+0x3a6/0x430 fs/namei.c:4122 __do_sys_unlinkat fs/namei.c:4302 [inline] __se_sys_unlinkat fs/namei.c:4296 [inline] __x64_sys_unlinkat+0xeb/0x130 fs/namei.c:4296 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The buggy address belongs to the object at ffff888074f63be8 which belongs to the cache dentry of size 312 The buggy address is located 104 bytes inside of 312-byte region [ffff888074f63be8, ffff888074f63d20) The buggy address belongs to the physical page: page:ffffea0001d3d880 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888074f638f8 pfn:0x74f62 head:ffffea0001d3d880 order:1 compound_mapcount:0 compound_pincount:0 memcg:ffff888020e75001 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001323b08 ffffea00011d0088 ffff888140007780 raw: ffff888074f638f8 000000000015000b 00000001ffffffff ffff888020e75001 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Reclaimable, gfp_mask 0xd20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_RECLAIMABLE), pid 3627, tgid 3627 (syz-executor.2), ts 106502308975, free_ts 12481134291 prep_new_page mm/page_alloc.c:2535 [inline] get_page_from_freelist+0x210d/0x3a30 mm/page_alloc.c:4282 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5506 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2280 alloc_slab_page mm/slub.c:1824 [inline] allocate_slab+0x27e/0x3d0 mm/slub.c:1969 new_slab mm/slub.c:2029 [inline] ___slab_alloc+0x89d/0xef0 mm/slub.c:3031 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118 slab_alloc_node mm/slub.c:3209 [inline] slab_alloc mm/slub.c:3251 [inline] __kmem_cache_alloc_lru mm/slub.c:3258 [inline] kmem_cache_alloc_lru+0x528/0x720 mm/slub.c:3275 __d_alloc+0x32/0x960 fs/dcache.c:1769 d_alloc_pseudo+0x19/0x70 fs/dcache.c:1899 alloc_file_pseudo+0xc6/0x250 fs/file_table.c:262 sock_alloc_file+0x4f/0x190 net/socket.c:463 sock_map_fd net/socket.c:487 [inline] __sys_socket+0x1a4/0x240 net/socket.c:1644 __do_sys_socket net/socket.c:1649 [inline] __se_sys_socket net/socket.c:1647 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1453 [inline] free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1503 free_unref_page_prepare mm/page_alloc.c:3383 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3479 free_contig_range+0xb1/0x180 mm/page_alloc.c:9400 destroy_args+0xa8/0x64c mm/debug_vm_pgtable.c:1031 debug_vm_pgtable+0x2954/0x29e5 mm/debug_vm_pgtable.c:1354 do_one_initcall+0xfe/0x650 init/main.c:1300 do_initcall_level init/main.c:1375 [inline] do_initcalls init/main.c:1391 [inline] do_basic_setup init/main.c:1410 [inline] kernel_init_freeable+0x6b1/0x73a init/main.c:1617 kernel_init+0x1a/0x1d0 init/main.c:1506 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Memory state around the buggy address: ffff888074f63b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888074f63b80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fb fb fb >ffff888074f63c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888074f63c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888074f63d00: fb fb fb fb fc fc fc fc fc fc fc fc fb fb fb fb ==================================================================