================================================================== BUG: KASAN: use-after-free in __extent_entry_type fs/bcachefs/extents.h:53 [inline] BUG: KASAN: use-after-free in extent_entry_is_crc fs/bcachefs/extents.h:120 [inline] BUG: KASAN: use-after-free in check_extent_overbig+0x27b/0x7d0 fs/bcachefs/fsck.c:1812 Read of size 8 at addr ffff8880687a0188 by task syz.3.393/9431 CPU: 1 UID: 0 PID: 9431 Comm: syz.3.393 Not tainted 6.14.0-rc1-syzkaller-00020-g0de63bb7d919 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 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:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 __extent_entry_type fs/bcachefs/extents.h:53 [inline] extent_entry_is_crc fs/bcachefs/extents.h:120 [inline] check_extent_overbig+0x27b/0x7d0 fs/bcachefs/fsck.c:1812 bch2_check_extents+0x9d0/0x60a0 fs/bcachefs/fsck.c:1945 bch2_run_recovery_pass+0xf0/0x1e0 fs/bcachefs/recovery_passes.c:226 bch2_run_recovery_passes+0x2ad/0xa90 fs/bcachefs/recovery_passes.c:291 bch2_fs_recovery+0x265a/0x3de0 fs/bcachefs/recovery.c:936 bch2_fs_start+0x37c/0x610 fs/bcachefs/super.c:1030 bch2_fs_get_tree+0xd8d/0x1740 fs/bcachefs/fs.c:2203 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3560 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdb8db8e54a 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:00007fdb8e9d9e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fdb8e9d9ef0 RCX: 00007fdb8db8e54a RDX: 0000000020000000 RSI: 0000000020000040 RDI: 00007fdb8e9d9eb0 RBP: 0000000020000000 R08: 00007fdb8e9d9ef0 R09: 0000000001000001 R10: 0000000001000001 R11: 0000000000000246 R12: 0000000020000040 R13: 00007fdb8e9d9eb0 R14: 00000000000059a0 R15: 0000000020000080 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x687a0 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffff8880b8644930 ffffea00014d5608 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 5, migratetype Unmovable, gfp_mask 0x52800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP), pid 9431, tgid 9430 (syz.3.393), ts 301432205402, free_ts 306569506146 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x3651/0x37a0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4739 __alloc_pages_noprof+0xa/0x30 mm/page_alloc.c:4773 __alloc_pages_node_noprof include/linux/gfp.h:265 [inline] alloc_pages_node_noprof include/linux/gfp.h:292 [inline] ___kmalloc_large_node+0x8b/0x1d0 mm/slub.c:4239 __kmalloc_large_node_noprof+0x1a/0x80 mm/slub.c:4266 __do_kmalloc_node mm/slub.c:4282 [inline] __kmalloc_node_noprof+0x33a/0x4d0 mm/slub.c:4300 __kvmalloc_node_noprof+0x72/0x190 mm/util.c:662 btree_bounce_alloc fs/bcachefs/btree_io.c:123 [inline] bch2_btree_node_read_done+0x36c1/0x5f70 fs/bcachefs/btree_io.c:1222 btree_node_read_work+0x6dc/0x1380 fs/bcachefs/btree_io.c:1358 bch2_btree_node_read+0x2433/0x29f0 __bch2_btree_root_read fs/bcachefs/btree_io.c:1789 [inline] bch2_btree_root_read+0x617/0x7a0 fs/bcachefs/btree_io.c:1811 read_btree_roots+0x3d3/0xa70 fs/bcachefs/recovery.c:581 bch2_fs_recovery+0x260f/0x3de0 fs/bcachefs/recovery.c:928 bch2_fs_start+0x37c/0x610 fs/bcachefs/super.c:1030 bch2_fs_get_tree+0xd8d/0x1740 fs/bcachefs/fs.c:2203 page last free pid 9431 tgid 9430 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] __free_pages_ok+0xbbc/0xe40 mm/page_alloc.c:1271 __folio_put+0x2b3/0x360 mm/swap.c:112 folio_put include/linux/mm.h:1489 [inline] free_large_kmalloc+0xfe/0x180 mm/slub.c:4728 kfree+0x212/0x430 mm/slub.c:4751 btree_bounce_free fs/bcachefs/btree_io.c:111 [inline] btree_node_sort+0x1100/0x1830 fs/bcachefs/btree_io.c:379 bch2_btree_post_write_cleanup+0x11a/0xa70 fs/bcachefs/btree_io.c:2293 bch2_btree_node_prep_for_write+0x55b/0x8f0 fs/bcachefs/btree_trans_commit.c:93 bch2_trans_lock_write+0x68e/0xc60 fs/bcachefs/btree_trans_commit.c:129 do_bch2_trans_commit fs/bcachefs/btree_trans_commit.c:862 [inline] __bch2_trans_commit+0x2595/0x97a0 fs/bcachefs/btree_trans_commit.c:1066 bch2_trans_commit fs/bcachefs/btree_update.h:183 [inline] check_extent fs/bcachefs/fsck.c:1902 [inline] bch2_check_extents+0x4131/0x60a0 fs/bcachefs/fsck.c:1945 bch2_run_recovery_pass+0xf0/0x1e0 fs/bcachefs/recovery_passes.c:226 bch2_run_recovery_passes+0x2ad/0xa90 fs/bcachefs/recovery_passes.c:291 bch2_fs_recovery+0x265a/0x3de0 fs/bcachefs/recovery.c:936 bch2_fs_start+0x37c/0x610 fs/bcachefs/super.c:1030 bch2_fs_get_tree+0xd8d/0x1740 fs/bcachefs/fs.c:2203 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 Memory state around the buggy address: ffff8880687a0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8880687a0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff8880687a0180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8880687a0200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8880687a0280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================