loop0: detected capacity change from 0 to 32768 bcachefs (loop0): starting version 1.7: mi_btree_bitmap opts=errors=continue,metadata_checksum=none,data_checksum=none,compression=lz4,foreground_target=invalid label 3838,background_target=invalid label 3838,promote_target=invalid label 3823,nojournal_transaction_names bcachefs (loop0): recovering from clean shutdown, journal seq 10 bcachefs (loop0): Version upgrade required: Version upgrade from 0.24: unwritten_extents to 1.7: mi_btree_bitmap incomplete Doing incompatible version upgrade from 0.24: unwritten_extents to 1.25: extent_flags running recovery passes: check_allocations,check_alloc_info,check_lrus,check_btree_backpointers,check_backpointers_to_extents,check_extents_to_backpointers,check_alloc_to_lru_refs,bucket_gens_init,check_snapshot_trees,check_snapshots,check_subvols,check_subvol_children,delete_dead_snapshots,check_inodes,check_extents,check_indirect_extents,check_dirents,check_xattrs,check_root,check_unreachable_inodes,check_subvolume_structure,check_directory_structure,check_nlinks,set_fs_needs_rebalance bcachefs (loop0): error validating btree node on loop0 at btree dirents level 0/0 u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 9aa2895aefce4bdf written 24 min_key POS_MIN durability: 1 ptr: 0:41:0 gen 0 node offset 16/24: btree node data missing: expected 24 sectors, found 16, fixing bcachefs (loop0): btree_node_read_work: rewriting btree node at due to error btree=dirents level=0 u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 9aa2895aefce4bdf written 24 min_key POS_MIN durability: 1 ptr: 0:41:0 gen 0 bcachefs (loop0): error validating btree node at btree alloc level 0/0 u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq ac62141f8dc7e261 written 24 min_key POS_MIN durability: 1 ptr: 0:26:0 gen 0 node offset 8/24 bset u64s 375 bset byte offset 184: keys out of order: u64s 11 type alloc_v4 0:32:0 len 0 ver 0 > u64s 11 type alloc_v4 0:2:0 len 0 ver 0, fixing bcachefs (loop0): btree_node_read_work: rewriting btree node at due to error btree=alloc level=0 u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq ac62141f8dc7e261 written 24 min_key POS_MIN durability: 1 ptr: 0:26:0 gen 0 ================================================================== BUG: KASAN: use-after-free in bch2_btree_node_read_done+0x116c/0x62d0 fs/bcachefs/btree_io.c:1084 Read of size 8 at addr ffff8880459c0010 by task syz.0.0/5324 CPU: 0 UID: 0 PID: 5324 Comm: syz.0.0 Not tainted 6.14.0-syzkaller-11125-g609706855d90 #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 bch2_btree_node_read_done+0x116c/0x62d0 fs/bcachefs/btree_io.c:1084 btree_node_read_work+0x6cb/0x1400 fs/bcachefs/btree_io.c:1365 bch2_btree_node_read+0x2427/0x29e0 fs/bcachefs/btree_io.c:-1 __bch2_btree_root_read fs/bcachefs/btree_io.c:1795 [inline] bch2_btree_root_read+0x656/0x7e0 fs/bcachefs/btree_io.c:1817 read_btree_roots+0x3d7/0xa80 fs/bcachefs/recovery.c:581 bch2_fs_recovery+0x28e4/0x3e20 fs/bcachefs/recovery.c:928 bch2_fs_start+0x37c/0x620 fs/bcachefs/super.c:1057 bch2_fs_get_tree+0x1270/0x18d0 fs/bcachefs/fs.c:2253 vfs_get_tree+0x90/0x2b0 fs/super.c:1759 do_new_mount+0x2cf/0xb70 fs/namespace.c:3878 do_mount fs/namespace.c:4218 [inline] __do_sys_mount fs/namespace.c:4429 [inline] __se_sys_mount+0x38c/0x400 fs/namespace.c:4406 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: 0033:0x7ff08258e90a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007ff0833f1e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ff0833f1ef0 RCX: 00007ff08258e90a RDX: 00002000000000c0 RSI: 0000200000000180 RDI: 00007ff0833f1eb0 RBP: 00002000000000c0 R08: 00007ff0833f1ef0 R09: 0000000001000410 R10: 0000000001000410 R11: 0000000000000246 R12: 0000200000000180 R13: 00007ff0833f1eb0 R14: 0000000000005966 R15: 0000200000005d40 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x459c0 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) raw: 04fff00000000000 ffffea0001167108 ffff88801fc3f8e0 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 2, migratetype Reclaimable, gfp_mask 0x452cd0(GFP_KERNEL_ACCOUNT|__GFP_RECLAIMABLE|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5324, tgid 5323 (syz.0.0), ts 69884583749, free_ts 70118528496 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1585 prep_new_page mm/page_alloc.c:1593 [inline] get_page_from_freelist+0x3ac1/0x3c60 mm/page_alloc.c:3538 __alloc_frozen_pages_noprof+0x266/0x580 mm/page_alloc.c:4806 __alloc_pages_noprof+0xa/0x30 mm/page_alloc.c:4840 __alloc_pages_node_noprof include/linux/gfp.h:284 [inline] alloc_pages_node_noprof include/linux/gfp.h:311 [inline] ___kmalloc_large_node+0x92/0x210 mm/slub.c:4262 __kmalloc_large_node_noprof+0x1a/0x80 mm/slub.c:4290 __do_kmalloc_node mm/slub.c:4306 [inline] __kvmalloc_node_noprof+0x7c/0x5a0 mm/slub.c:5003 btree_node_data_alloc+0xdb/0x260 fs/bcachefs/btree_cache.c:156 __bch2_btree_node_mem_alloc+0x201/0x420 fs/bcachefs/btree_cache.c:201 bch2_fs_btree_cache_init+0x27a/0x630 fs/bcachefs/btree_cache.c:656 bch2_fs_alloc fs/bcachefs/super.c:935 [inline] bch2_fs_open+0x2de2/0x32a0 fs/bcachefs/super.c:2182 bch2_fs_get_tree+0x77b/0x18d0 fs/bcachefs/fs.c:2172 vfs_get_tree+0x90/0x2b0 fs/super.c:1759 do_new_mount+0x2cf/0xb70 fs/namespace.c:3878 do_mount fs/namespace.c:4218 [inline] __do_sys_mount fs/namespace.c:4429 [inline] __se_sys_mount+0x38c/0x400 fs/namespace.c:4406 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 page last free pid 5324 tgid 5323 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1130 [inline] __free_frozen_pages+0xd85/0x1030 mm/page_alloc.c:2707 __folio_put+0x2b5/0x360 mm/swap.c:112 folio_put include/linux/mm.h:1477 [inline] free_large_kmalloc+0x143/0x1e0 mm/slub.c:4758 kfree+0x216/0x430 mm/slub.c:4826 btree_bounce_free fs/bcachefs/btree_io.c:112 [inline] bch2_btree_node_read_done+0x3dd1/0x62d0 fs/bcachefs/btree_io.c:1244 btree_node_read_work+0x6cb/0x1400 fs/bcachefs/btree_io.c:1365 bch2_btree_node_read+0x2427/0x29e0 fs/bcachefs/btree_io.c:-1 __bch2_btree_root_read fs/bcachefs/btree_io.c:1795 [inline] bch2_btree_root_read+0x656/0x7e0 fs/bcachefs/btree_io.c:1817 read_btree_roots+0x3d7/0xa80 fs/bcachefs/recovery.c:581 bch2_fs_recovery+0x28e4/0x3e20 fs/bcachefs/recovery.c:928 bch2_fs_start+0x37c/0x620 fs/bcachefs/super.c:1057 bch2_fs_get_tree+0x1270/0x18d0 fs/bcachefs/fs.c:2253 vfs_get_tree+0x90/0x2b0 fs/super.c:1759 do_new_mount+0x2cf/0xb70 fs/namespace.c:3878 do_mount fs/namespace.c:4218 [inline] __do_sys_mount fs/namespace.c:4429 [inline] __se_sys_mount+0x38c/0x400 fs/namespace.c:4406 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 Memory state around the buggy address: ffff8880459bff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880459bff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880459c0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8880459c0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8880459c0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================