kworker/u17:8: attempt to access beyond end of device loop0: rw=1048577, sector=49152, nr_sectors = 4096 limit=40427 ================================================================== BUG: KASAN: use-after-free in rb_link_node include/linux/rbtree.h:65 [inline] BUG: KASAN: use-after-free in __attach_extent_node+0x50b/0x620 fs/f2fs/extent_cache.c:372 Write of size 8 at addr ffff888026565ba8 by task kworker/u17:8/5945 CPU: 2 PID: 5945 Comm: kworker/u17:8 Not tainted 6.2.0-rc8-syzkaller-00027-g033c40a89f55 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: writeback wb_workfn (flush-7:0) Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:306 [inline] print_report+0x15e/0x461 mm/kasan/report.c:417 kasan_report+0xbf/0x1f0 mm/kasan/report.c:517 rb_link_node include/linux/rbtree.h:65 [inline] __attach_extent_node+0x50b/0x620 fs/f2fs/extent_cache.c:372 __insert_extent_tree+0x1d6/0x670 fs/f2fs/extent_cache.c:655 __update_extent_tree_range+0x14ce/0x1740 fs/f2fs/extent_cache.c:795 __update_extent_cache+0x588/0x740 fs/f2fs/extent_cache.c:962 f2fs_outplace_write_data+0x1eb/0x280 fs/f2fs/segment.c:3453 f2fs_do_write_data_page+0x9c7/0x1e20 fs/f2fs/data.c:2745 f2fs_write_single_data_page+0x13f0/0x1920 fs/f2fs/data.c:2863 f2fs_write_cache_pages+0xaa8/0x2010 fs/f2fs/data.c:3115 __f2fs_write_data_pages fs/f2fs/data.c:3265 [inline] f2fs_write_data_pages+0xca8/0x1230 fs/f2fs/data.c:3292 do_writepages+0x1af/0x690 mm/page-writeback.c:2581 __writeback_single_inode+0x159/0x1440 fs/fs-writeback.c:1598 writeback_sb_inodes+0x54d/0xf90 fs/fs-writeback.c:1889 __writeback_inodes_wb+0xc6/0x280 fs/fs-writeback.c:1960 wb_writeback+0x8d6/0xd70 fs/fs-writeback.c:2065 wb_check_background_flush fs/fs-writeback.c:2131 [inline] wb_do_writeback fs/fs-writeback.c:2219 [inline] wb_workfn+0xa16/0x12f0 fs/fs-writeback.c:2246 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Allocated by task 6457: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:761 [inline] slab_alloc_node mm/slab.c:3263 [inline] slab_alloc mm/slab.c:3272 [inline] __kmem_cache_alloc_lru mm/slab.c:3449 [inline] kmem_cache_alloc+0x225/0x460 mm/slab.c:3458 f2fs_kmem_cache_alloc_nofail fs/f2fs/f2fs.h:2796 [inline] f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2806 [inline] __grab_extent_tree+0x278/0x5a0 fs/f2fs/extent_cache.c:423 f2fs_init_extent_tree+0x57/0x80 fs/f2fs/extent_cache.c:533 f2fs_new_inode+0xdfa/0x2760 fs/f2fs/namei.c:312 __f2fs_tmpfile+0xba/0x440 fs/f2fs/namei.c:852 f2fs_ioc_start_atomic_write+0x409/0x1260 fs/f2fs/file.c:2098 __f2fs_ioctl+0x3f2a/0xaaf0 fs/f2fs/file.c:4150 f2fs_ioctl+0x18e/0x220 fs/f2fs/file.c:4242 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 6456: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:523 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x13b/0x1a0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] __cache_free mm/slab.c:3396 [inline] __do_kmem_cache_free mm/slab.c:3582 [inline] kmem_cache_free mm/slab.c:3607 [inline] kmem_cache_free+0x108/0x4c0 mm/slab.c:3600 __destroy_extent_tree+0x1f8/0x7f0 fs/f2fs/extent_cache.c:1193 f2fs_destroy_extent_tree+0x17/0x30 fs/f2fs/extent_cache.c:1204 f2fs_evict_inode+0x38b/0x1df0 fs/f2fs/inode.c:789 evict+0x2ed/0x6b0 fs/inode.c:664 iput_final fs/inode.c:1747 [inline] iput.part.0+0x59b/0x880 fs/inode.c:1773 iput+0x5c/0x80 fs/inode.c:1763 f2fs_abort_atomic_write+0xea/0x4f0 fs/f2fs/segment.c:196 f2fs_release_file+0xc8/0xf0 fs/f2fs/file.c:1869 __fput+0x27c/0xa90 fs/file_table.c:320 task_work_run+0x16f/0x270 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888026565ba0 which belongs to the cache f2fs_extent_tree of size 144 The buggy address is located 8 bytes inside of 144-byte region [ffff888026565ba0, ffff888026565c30) The buggy address belongs to the physical page: page:ffffea0000995940 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26565 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffff88801a8de600 ffff88801a9fad50 ffff88801a9fad50 raw: 0000000000000000 ffff888026565040 0000000100000013 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x242050(__GFP_IO|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE|__GFP_RECLAIMABLE), pid 6457, tgid 6456 (syz-executor.0), ts 509360787281, free_ts 399996200122 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x119c/0x2ce0 mm/page_alloc.c:4283 __alloc_pages_slowpath.constprop.0+0x36b/0x23d0 mm/page_alloc.c:5084 __alloc_pages+0x4aa/0x5b0 mm/page_alloc.c:5562 __alloc_pages_node include/linux/gfp.h:237 [inline] kmem_getpages mm/slab.c:1363 [inline] cache_grow_begin+0x94/0x390 mm/slab.c:2576 cache_alloc_refill+0x27f/0x380 mm/slab.c:2949 ____cache_alloc mm/slab.c:3025 [inline] ____cache_alloc mm/slab.c:3008 [inline] __do_cache_alloc mm/slab.c:3208 [inline] slab_alloc_node mm/slab.c:3256 [inline] slab_alloc mm/slab.c:3272 [inline] __kmem_cache_alloc_lru mm/slab.c:3449 [inline] kmem_cache_alloc+0x366/0x460 mm/slab.c:3458 f2fs_kmem_cache_alloc_nofail fs/f2fs/f2fs.h:2796 [inline] f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2806 [inline] __grab_extent_tree+0x278/0x5a0 fs/f2fs/extent_cache.c:423 f2fs_init_extent_tree+0x57/0x80 fs/f2fs/extent_cache.c:533 f2fs_new_inode+0xdfa/0x2760 fs/f2fs/namei.c:312 f2fs_create+0x1db/0x670 fs/f2fs/namei.c:353 lookup_open.isra.0+0xee7/0x1270 fs/namei.c:3413 open_last_lookups fs/namei.c:3481 [inline] path_openat+0x975/0x2a50 fs/namei.c:3711 do_filp_open+0x1ba/0x410 fs/namei.c:3741 do_sys_openat2+0x16d/0x4c0 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __x64_sys_openat+0x143/0x1f0 fs/open.c:1337 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare+0x66a/0xc20 mm/page_alloc.c:1496 free_unref_page_prepare mm/page_alloc.c:3369 [inline] free_unref_page+0x1d/0x490 mm/page_alloc.c:3464 slab_destroy mm/slab.c:1619 [inline] drain_freelist.isra.0+0xdd/0x130 mm/slab.c:2212 cache_reap+0x1bd/0x2e0 mm/slab.c:3875 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffff888026565a80: fc fc fc fc fc fc fc fc fc fc fa fb fb fb fb fb ffff888026565b00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff888026565b80: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb ^ ffff888026565c00: fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00 00 ffff888026565c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================