u64s 8 type snapshot 0:4294967295:0 len 0 ver 0: is_subvol 1 deleted 0 parent 0 children 0 0 subvol 1 tree 0, fixing bcachefs (loop0): snapshot points to missing/incorrect tree: u64s 8 type snapshot 0:4294967295:0 len 0 ver 0: is_subvol 1 deleted 0 parent 0 children 0 0 subvol 1 tree 0, fixing done bcachefs (loop0): check_subvols... done bcachefs (loop0): check_subvol_children... done bcachefs (loop0): delete_dead_snapshots... done bcachefs (loop0): check_inodes... done bcachefs (loop0): check_extents... done bcachefs (loop0): check_indirect_extents... done bcachefs (loop0): check_dirents... done bcachefs (loop0): check_xattrs... done bcachefs (loop0): check_root... done bcachefs (loop0): check_unreachable_inodes... done bcachefs (loop0): check_subvolume_structure... done bcachefs (loop0): check_directory_structure... done bcachefs (loop0): check_nlinks... done bcachefs (loop0): resume_logged_ops... done bcachefs (loop0): delete_dead_inodes... done bcachefs (loop0): set_fs_needs_rebalance... done bcachefs (loop0): Fixed errors, running fsck a second time to verify fs is clean bcachefs (loop0): check_alloc_info... done bcachefs (loop0): check_lrus... done bcachefs (loop0): check_btree_backpointers... done bcachefs (loop0): check_backpointers_to_extents... done bcachefs (loop0): check_extents_to_backpointers... done bcachefs (loop0): check_alloc_to_lru_refs... done bcachefs (loop0): bucket_gens_init... done bcachefs (loop0): check_snapshot_trees... done bcachefs (loop0): check_snapshots... done bcachefs (loop0): check_subvols... done bcachefs (loop0): check_subvol_children... done bcachefs (loop0): delete_dead_snapshots... done bcachefs (loop0): check_inodes... done bcachefs (loop0): check_extents... done bcachefs (loop0): check_indirect_extents... done bcachefs (loop0): check_dirents... done bcachefs (loop0): check_xattrs... done bcachefs (loop0): check_root... done bcachefs (loop0): check_unreachable_inodes... done bcachefs (loop0): check_subvolume_structure... done bcachefs (loop0): check_directory_structure... done bcachefs (loop0): check_nlinks... done bcachefs (loop0): resume_logged_ops... done bcachefs (loop0): delete_dead_inodes... done bcachefs (loop0): set_fs_needs_rebalance... done bcachefs (loop0): reading quotas bcachefs (loop0): quotas done bcachefs (loop0): done starting filesystem ================================================================== BUG: KASAN: slab-use-after-free in bchfs_read+0x2ac0/0x3290 fs/bcachefs/fs-io-buffered.c:228 Read of size 4 at addr ffff8880123b1148 by task syz.0.0/5330 CPU: 0 UID: 0 PID: 5330 Comm: syz.0.0 Not tainted 6.15.0-rc1-syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 bchfs_read+0x2ac0/0x3290 fs/bcachefs/fs-io-buffered.c:228 bch2_readahead+0xe7a/0x12d0 fs/bcachefs/fs-io-buffered.c:301 read_pages+0x193/0x590 mm/readahead.c:160 page_cache_ra_unbounded+0x708/0x820 mm/readahead.c:297 filemap_get_pages+0x59f/0x1fc0 mm/filemap.c:2590 filemap_read+0x466/0x1260 mm/filemap.c:2701 bch2_read_iter+0x1179/0x14b0 fs/bcachefs/fs-io-direct.c:221 new_sync_read fs/read_write.c:489 [inline] vfs_read+0x9a0/0xb90 fs/read_write.c:570 ksys_read+0x19d/0x2d0 fs/read_write.c:713 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fde1a38d169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fde1b198038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007fde1a5a5fa0 RCX: 00007fde1a38d169 RDX: 0000000000002020 RSI: 0000200000000580 RDI: 0000000000000005 RBP: 00007fde1a40e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fde1a5a5fa0 R15: 00007ffe4aaede48 Allocated by task 5330: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_mempool_unpoison_object+0x9e/0x170 mm/kasan/common.c:547 kasan_unpoison_element mm/mempool.c:-1 [inline] remove_element+0x129/0x1a0 mm/mempool.c:150 mempool_alloc_noprof+0x552/0x5a0 mm/mempool.c:408 bio_alloc_bioset+0x26f/0x1130 block/bio.c:554 bch2_readahead+0xbaf/0x12d0 fs/bcachefs/fs-io-buffered.c:290 read_pages+0x193/0x590 mm/readahead.c:160 page_cache_ra_unbounded+0x708/0x820 mm/readahead.c:297 filemap_get_pages+0x59f/0x1fc0 mm/filemap.c:2590 filemap_read+0x466/0x1260 mm/filemap.c:2701 bch2_read_iter+0x1179/0x14b0 fs/bcachefs/fs-io-direct.c:221 new_sync_read fs/read_write.c:489 [inline] vfs_read+0x9a0/0xb90 fs/read_write.c:570 ksys_read+0x19d/0x2d0 fs/read_write.c:713 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5330: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_mempool_poison_object+0xaa/0x120 mm/kasan/common.c:522 kasan_mempool_poison_object include/linux/kasan.h:360 [inline] kasan_poison_element mm/mempool.c:118 [inline] add_element mm/mempool.c:141 [inline] mempool_free+0x1c8/0x390 mm/mempool.c:541 bch2_readpages_end_io+0x17c/0x1d0 fs/bcachefs/fs-io-buffered.c:36 bch2_rbio_done fs/bcachefs/io_read.c:430 [inline] __bch2_read_extent+0x1348/0x4400 fs/bcachefs/io_read.c:1257 bch2_read_extent fs/bcachefs/io_read.h:140 [inline] bchfs_read+0x2379/0x3290 fs/bcachefs/fs-io-buffered.c:226 bch2_readahead+0xe7a/0x12d0 fs/bcachefs/fs-io-buffered.c:301 read_pages+0x193/0x590 mm/readahead.c:160 page_cache_ra_unbounded+0x708/0x820 mm/readahead.c:297 filemap_get_pages+0x59f/0x1fc0 mm/filemap.c:2590 filemap_read+0x466/0x1260 mm/filemap.c:2701 bch2_read_iter+0x1179/0x14b0 fs/bcachefs/fs-io-direct.c:221 new_sync_read fs/read_write.c:489 [inline] vfs_read+0x9a0/0xb90 fs/read_write.c:570 ksys_read+0x19d/0x2d0 fs/read_write.c:713 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880123b1000 which belongs to the cache bio-488 of size 488 The buggy address is located 328 bytes inside of freed 488-byte region [ffff8880123b1000, ffff8880123b11e8) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x123b1 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff888051b973c0 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000060006 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x40cc0(GFP_KERNEL|__GFP_COMP), pid 5330, tgid 5329 (syz.0.0), ts 70437276765, free_ts 70405540707 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1717 prep_new_page mm/page_alloc.c:1725 [inline] get_page_from_freelist+0x352b/0x36c0 mm/page_alloc.c:3652 __alloc_pages_slowpath+0x436/0x1080 mm/page_alloc.c:4473 __alloc_frozen_pages_noprof+0x40d/0x5b0 mm/page_alloc.c:4947 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2459 [inline] allocate_slab+0xe9/0x3a0 mm/slub.c:2631 new_slab mm/slub.c:2676 [inline] ___slab_alloc+0xc3b/0x1500 mm/slub.c:3862 __slab_alloc+0x58/0xa0 mm/slub.c:3952 __slab_alloc_node mm/slub.c:4027 [inline] slab_alloc_node mm/slub.c:4188 [inline] kmem_cache_alloc_noprof+0x270/0x390 mm/slub.c:4207 mempool_init_node+0x1ee/0x4e0 mm/mempool.c:217 mempool_init_noprof+0x3a/0x50 mm/mempool.c:246 bioset_init+0x2ea/0x820 block/bio.c:1709 bch2_fs_io_read_init+0x29/0xc0 fs/bcachefs/io_read.c:1377 bch2_fs_alloc fs/bcachefs/super.c:953 [inline] bch2_fs_open+0x2f37/0x32a0 fs/bcachefs/super.c:2219 bch2_fs_get_tree+0x77b/0x18f0 fs/bcachefs/fs.c:2172 vfs_get_tree+0x90/0x2b0 fs/super.c:1759 page last free pid 1359 tgid 1359 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] __free_frozen_pages+0xde8/0x10a0 mm/page_alloc.c:2680 kasan_depopulate_vmalloc_pte+0x74/0x90 mm/kasan/shadow.c:408 apply_to_pte_range mm/memory.c:2941 [inline] apply_to_pmd_range mm/memory.c:2985 [inline] apply_to_pud_range mm/memory.c:3021 [inline] apply_to_p4d_range mm/memory.c:3057 [inline] __apply_to_page_range+0x808/0xde0 mm/memory.c:3093 kasan_release_vmalloc+0xa5/0xd0 mm/kasan/shadow.c:529 kasan_release_vmalloc_node mm/vmalloc.c:2196 [inline] purge_vmap_node+0x231/0x8e0 mm/vmalloc.c:2213 __purge_vmap_area_lazy+0x753/0xb20 mm/vmalloc.c:2304 drain_vmap_area_work+0x27/0x40 mm/vmalloc.c:2338 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd50 kernel/workqueue.c:3400 kthread+0x7b7/0x940 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff8880123b1000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880123b1080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880123b1100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880123b1180: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ffff8880123b1200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================