u64s 7 type extent 536870913:24:U32_MAX len 24 ver 0: durability: 1 crc: c_size 8 size 24 offset 0 nonce 0 csum none 0:0 compress lz4 ptr: 0:34:8 gen 0, fixing ================================================================== BUG: KASAN: use-after-free in __extent_entry_type fs/bcachefs/extents.h:54 [inline] BUG: KASAN: use-after-free in extent_entry_is_crc fs/bcachefs/extents.h:121 [inline] BUG: KASAN: use-after-free in check_extent_overbig+0x27b/0x7d0 fs/bcachefs/fsck.c:1904 Read of size 8 at addr ffff8880518a0188 by task syz-executor254/7637 CPU: 1 UID: 0 PID: 7637 Comm: syz-executor254 Not tainted 6.13.0-rc1-syzkaller-00025-gfeffde684ac2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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:54 [inline] extent_entry_is_crc fs/bcachefs/extents.h:121 [inline] check_extent_overbig+0x27b/0x7d0 fs/bcachefs/fsck.c:1904 bch2_check_extents+0xa23/0x65a0 fs/bcachefs/fsck.c:2037 bch2_run_recovery_pass+0xf0/0x1e0 fs/bcachefs/recovery_passes.c:191 bch2_run_recovery_passes+0x3a7/0x880 fs/bcachefs/recovery_passes.c:244 bch2_fs_recovery+0x25cc/0x39d0 fs/bcachefs/recovery.c:861 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1037 bch2_fs_get_tree+0xd68/0x1710 fs/bcachefs/fs.c:2170 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034 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: 0033:0x7fc6920b111a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 1e 09 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc691859048 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000000 RCX: 00007fc6920b111a RDX: 00000000200000c0 RSI: 0000000020000000 RDI: 00007fc6918590a0 RBP: 00000000200000c0 R08: 00007fc6918590e0 R09: 000000000000598a R10: 0000000000800000 R11: 0000000000000282 R12: 00007fc6918590a0 R13: 00007fc6918590e0 R14: 0000000000005991 R15: 0000000020006a00 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x518a0 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 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 7637, tgid 7636 (syz-executor254), ts 149145294872, free_ts 151843036086 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0x3651/0x37a0 mm/page_alloc.c:3474 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4751 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] ___kmalloc_large_node+0x8b/0x1d0 mm/slub.c:4228 __kmalloc_large_node_noprof+0x1a/0x80 mm/slub.c:4255 __do_kmalloc_node mm/slub.c:4271 [inline] __kmalloc_node_noprof+0x33a/0x4d0 mm/slub.c:4289 __kvmalloc_node_noprof+0x72/0x190 mm/util.c:650 btree_bounce_alloc fs/bcachefs/btree_io.c:124 [inline] bch2_btree_node_read_done+0x3808/0x5e90 fs/bcachefs/btree_io.c:1188 btree_node_read_work+0x68b/0x1260 fs/bcachefs/btree_io.c:1323 bch2_btree_node_read+0x2433/0x29f0 __bch2_btree_root_read fs/bcachefs/btree_io.c:1749 [inline] bch2_btree_root_read+0x617/0x7a0 fs/bcachefs/btree_io.c:1771 read_btree_roots+0x296/0x840 fs/bcachefs/recovery.c:523 bch2_fs_recovery+0x2585/0x39d0 fs/bcachefs/recovery.c:853 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1037 bch2_fs_get_tree+0xd68/0x1710 fs/bcachefs/fs.c:2170 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 page last free pid 7637 tgid 7636 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] __free_pages_ok+0xc87/0xf80 mm/page_alloc.c:1269 __folio_put+0x2c7/0x440 mm/swap.c:112 folio_put include/linux/mm.h:1488 [inline] free_large_kmalloc+0x105/0x1c0 mm/slub.c:4717 kfree+0x212/0x430 mm/slub.c:4740 btree_bounce_free fs/bcachefs/btree_io.c:112 [inline] btree_node_sort+0x1100/0x1830 fs/bcachefs/btree_io.c:380 bch2_btree_post_write_cleanup+0x11a/0xa70 fs/bcachefs/btree_io.c:2248 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:896 [inline] __bch2_trans_commit+0x26f2/0x93c0 fs/bcachefs/btree_trans_commit.c:1121 bch2_trans_commit fs/bcachefs/btree_update.h:184 [inline] check_extent fs/bcachefs/fsck.c:1994 [inline] bch2_check_extents+0x4579/0x65a0 fs/bcachefs/fsck.c:2037 bch2_run_recovery_pass+0xf0/0x1e0 fs/bcachefs/recovery_passes.c:191 bch2_run_recovery_passes+0x3a7/0x880 fs/bcachefs/recovery_passes.c:244 bch2_fs_recovery+0x25cc/0x39d0 fs/bcachefs/recovery.c:861 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1037 bch2_fs_get_tree+0xd68/0x1710 fs/bcachefs/fs.c:2170 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 Memory state around the buggy address: ffff8880518a0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8880518a0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff8880518a0180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8880518a0200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8880518a0280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================