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,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): invalid bkey in btree_node btree=extents level=0: u64s 10 type inode 4100:8:U32_MAX len 8 ver 0: (unpack error) invalid str hash type (6 >= 4), deleting bcachefs (loop0): running explicit recovery pass check_topology (2), currently at recovery_pass_empty (0) bcachefs (loop0): bcachefs (loop0): error validating btree node on loop0 at btree inodes level 0/0 u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 7589ab5e0c11cc7a written 24 min_key POS_MIN durability: 1 ptr: 0:38:0 gen 0 node offset 0/24 bset u64s 0: incorrect max key U64_MAX:18446462598733365247:U32_MAX, btree topology error: bcachefs (loop0): flagging btree inodes lost data bcachefs (loop0): running explicit recovery pass scan_for_btree_nodes (1), currently at recovery_pass_empty (0) bcachefs (loop0): error reading btree root btree=inodes level=0: btree_node_read_error, fixing bcachefs (loop0): 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 8/24 bset u64s 6: checksum error, type none: got should be , fixing bcachefs (loop0): 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): 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/0x62c0 fs/bcachefs/btree_io.c:1085 Read of size 8 at addr ffff888044a28010 by task syz.0.0/5329 CPU: 0 UID: 0 PID: 5329 Comm: syz.0.0 Not tainted 6.15.0-rc1-syzkaller-00095-g2eb959eeecc6 #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/0x62c0 fs/bcachefs/btree_io.c:1085 btree_node_read_work+0x6cb/0x1400 fs/bcachefs/btree_io.c:1366 bch2_btree_node_read+0x2427/0x29e0 fs/bcachefs/btree_io.c:-1 __bch2_btree_root_read fs/bcachefs/btree_io.c:1797 [inline] bch2_btree_root_read+0x656/0x7e0 fs/bcachefs/btree_io.c:1819 read_btree_roots+0x3d7/0xa80 fs/bcachefs/recovery.c:581 bch2_fs_recovery+0x28e4/0x3e20 fs/bcachefs/recovery.c:928 bch2_fs_start+0x310/0x620 fs/bcachefs/super.c:1069 bch2_fs_get_tree+0x113e/0x18f0 fs/bcachefs/fs.c:2253 vfs_get_tree+0x90/0x2b0 fs/super.c:1759 do_new_mount+0x2cf/0xb70 fs/namespace.c:3879 do_mount fs/namespace.c:4219 [inline] __do_sys_mount fs/namespace.c:4430 [inline] __se_sys_mount+0x38c/0x400 fs/namespace.c:4407 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: 0033:0x7f987e58e90a 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:00007f987f482e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f987f482ef0 RCX: 00007f987e58e90a RDX: 00002000000000c0 RSI: 0000200000000180 RDI: 00007f987f482eb0 RBP: 00002000000000c0 R08: 00007f987f482ef0 R09: 0000000000000010 R10: 0000000000000010 R11: 0000000000000246 R12: 0000200000000180 R13: 00007f987f482eb0 R14: 000000000000596c R15: 0000200000000480 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x44a28 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) raw: 04fff00000000000 ffffea0001128b08 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 5329, tgid 5328 (syz.0.0), ts 68954048629, free_ts 69261882637 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_frozen_pages_noprof+0x211/0x5b0 mm/page_alloc.c:4934 __alloc_pages_noprof+0xa/0x30 mm/page_alloc.c:4968 __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:4275 __kmalloc_large_node_noprof+0x1a/0x80 mm/slub.c:4303 __do_kmalloc_node mm/slub.c:4319 [inline] __kvmalloc_node_noprof+0x7c/0x5a0 mm/slub.c:5016 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:946 [inline] bch2_fs_open+0x2dea/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 do_new_mount+0x2cf/0xb70 fs/namespace.c:3879 do_mount fs/namespace.c:4219 [inline] __do_sys_mount fs/namespace.c:4430 [inline] __se_sys_mount+0x38c/0x400 fs/namespace.c:4407 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 5329 tgid 5328 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 __folio_put+0x2b5/0x360 mm/swap.c:112 folio_put include/linux/mm.h:1563 [inline] free_large_kmalloc+0x143/0x1e0 mm/slub.c:4771 kfree+0x216/0x430 mm/slub.c:4839 btree_bounce_free fs/bcachefs/btree_io.c:112 [inline] bch2_btree_node_read_done+0x3dcd/0x62c0 fs/bcachefs/btree_io.c:1245 btree_node_read_work+0x6cb/0x1400 fs/bcachefs/btree_io.c:1366 bch2_btree_node_read+0x2427/0x29e0 fs/bcachefs/btree_io.c:-1 __bch2_btree_root_read fs/bcachefs/btree_io.c:1797 [inline] bch2_btree_root_read+0x656/0x7e0 fs/bcachefs/btree_io.c:1819 read_btree_roots+0x3d7/0xa80 fs/bcachefs/recovery.c:581 bch2_fs_recovery+0x28e4/0x3e20 fs/bcachefs/recovery.c:928 bch2_fs_start+0x310/0x620 fs/bcachefs/super.c:1069 bch2_fs_get_tree+0x113e/0x18f0 fs/bcachefs/fs.c:2253 vfs_get_tree+0x90/0x2b0 fs/super.c:1759 do_new_mount+0x2cf/0xb70 fs/namespace.c:3879 do_mount fs/namespace.c:4219 [inline] __do_sys_mount fs/namespace.c:4430 [inline] __se_sys_mount+0x38c/0x400 fs/namespace.c:4407 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: ffff888044a27f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888044a27f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888044a28000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888044a28080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888044a28100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================