bcachefs (loop0): backpointer doesn't match extent it points to: u64s 9 type backpointer 0:8921088:0 len 0 ver 0: bucket=0:34:8 btree=extents level=0 data_type=user suboffset=0 len=8 gen=0 pos=536870913:24:U32_MAX u64s 5 type deleted 536870913:24:U32_MAX len 0 ver 0, fixing done bcachefs (loop0): check_inodes... done bcachefs (loop0): check_extents... done bcachefs (loop0): check_dirents... bcachefs (loop0): hash table key at wrong offset: btree dirents inode 4096 offset 189491840996961599, hashed to 1984377310421975534 u64s 7 type dirent 4096:189491840996961599:U32_MAX len 0 ver 0: file0 -> 4098 type dir, fixing bcachefs (loop0): hash table key at wrong offset: btree dirents inode 4096 offset 1896155912177158345, hashed to 5199120007822187974 u64s 7 type dirent 4096:1896155912177158345:U32_MAX len 0 ver 0: file3 -> 536870913 type reg, fixing bcachefs (loop0): dirent points to missing inode: u64s 7 type dirent 4096:1984377310421975534:U32_MAX len 0 ver 0: file0 -> 4098 type dir, fixing bcachefs (loop0): hash table key at wrong offset: btree dirents inode 4096 offset 2695648408715017799, hashed to 8176558988515895811 u64s 7 type dirent 4096:2695648408715017799:U32_MAX len 0 ver 0: file2 -> 536870913 type reg, fixing bcachefs (loop0): hash table key at wrong offset: btree dirents inode 4096 offset 4330382808765825483, hashed to 516132292163856882 u64s 7 type dirent 4096:4330382808765825483:U32_MAX len 0 ver 0: file1 -> 536870912 type reg, fixing bcachefs (loop0): dirent points to missing inode: u64s 7 type dirent 4096:5199120007822187974:U32_MAX len 0 ver 0: file3 -> 536870913 type reg, fixing bcachefs (loop0): hash table key at wrong offset: btree dirents inode 4096 offset 8130059955150870709, hashed to 4872807008632140492 u64s 8 type dirent 4096:8130059955150870709:U32_MAX len 0 ver 0: lost+found -> 4097 type dir, fixing bcachefs (loop0): dirent points to missing inode: u64s 7 type dirent 4096:8176558988515895811:U32_MAX len 0 ver 0: file2 -> 536870913 type reg, fixing bcachefs (loop0): hash table key at wrong offset: btree dirents inode 4096 offset 9097378837824744618, hashed to 2037035455941237464 u64s 8 type dirent 4096:9097378837824744618:U32_MAX len 0 ver 0: file.cold -> 536870914 type reg, fixing bcachefs (loop0): hash table key at wrong offset: btree dirents inode 4098 offset 5675548428000973578, hashed to 4671699833422627963 u64s 7 type dirent 4098:5675548428000973578:U32_MAX len 0 ver 0: file1 -> 4100 type lnk, fixing bcachefs (loop0): hash table key at wrong offset: btree dirents inode 4098 offset 8977922886548783724, hashed to 3516506258108033895 u64s 7 type dirent 4098:8977922886548783724:U32_MAX len 0 ver 0: file0 -> 4099 type reg, fixing done bcachefs (loop0): resume_logged_ops... done bcachefs (loop0): delete_dead_inodes... done bcachefs (loop0): Fixed errors, running fsck a second time to verify fs is clean bcachefs (loop0): check_lrus... done bcachefs (loop0): check_backpointers_to_extents... done bcachefs (loop0): check_inodes... done bcachefs (loop0): check_extents... done bcachefs (loop0): check_dirents... bcachefs (loop0): dirent points to missing inode: u64s 7 type dirent 4096:516132292163856882:U32_MAX len 0 ver 0: file1 -> 536870912 type reg, fixing bcachefs (loop0): dirent points to missing inode: u64s 8 type dirent 4096:2037035455941237464:U32_MAX len 0 ver 0: file.cold -> 536870914 type reg, fixing bcachefs (loop0): dirent points to missing inode: u64s 8 type dirent 4096:4872807008632140492:U32_MAX len 0 ver 0: lost+found -> 4097 type dir, fixing bcachefs (loop0): fsck counted subdirectories wrong for inum 4096:4294967295: got 1 should be 0 bcachefs (loop0): dirent points to missing inode: u64s 7 type dirent 4098:3516506258108033895:U32_MAX len 0 ver 0: file0 -> 4099 type reg, fixing bcachefs (loop0): dirent points to missing inode: u64s 7 type dirent 4098:4671699833422627963:U32_MAX len 0 ver 0: file1 -> 4100 type lnk, fixing ================================================================== BUG: KASAN: use-after-free in check_dirent fs/bcachefs/fsck.c:2247 [inline] BUG: KASAN: use-after-free in bch2_check_dirents+0x1b5c/0x23e0 fs/bcachefs/fsck.c:2272 Read of size 1 at addr ffff888055780170 by task syz.0.0/5324 CPU: 0 UID: 0 PID: 5324 Comm: syz.0.0 Not tainted 6.15.0-rc3-syzkaller-00094-g02ddfb981de8 #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_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xb4/0x290 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 check_dirent fs/bcachefs/fsck.c:2247 [inline] bch2_check_dirents+0x1b5c/0x23e0 fs/bcachefs/fsck.c:2272 bch2_run_recovery_pass+0xdf/0x1d0 fs/bcachefs/recovery_passes.c:226 bch2_run_recovery_passes+0x2be/0xaf0 fs/bcachefs/recovery_passes.c:285 bch2_fs_recovery+0x26c8/0x37b0 fs/bcachefs/recovery.c:973 bch2_fs_start+0x32a/0x680 fs/bcachefs/super.c:1065 bch2_fs_get_tree+0xd99/0x1340 fs/bcachefs/fs.c:2253 vfs_get_tree+0x8f/0x2b0 fs/super.c:1759 do_new_mount+0x249/0xa50 fs/namespace.c:3881 do_mount fs/namespace.c:4221 [inline] __do_sys_mount fs/namespace.c:4432 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4409 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc13c79010a 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:00007fc13d654e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fc13d654ef0 RCX: 00007fc13c79010a RDX: 0000200000000000 RSI: 0000200000000040 RDI: 00007fc13d654eb0 RBP: 0000200000000000 R08: 00007fc13d654ef0 R09: 0000000001000001 R10: 0000000001000001 R11: 0000000000000246 R12: 0000200000000040 R13: 00007fc13d654eb0 R14: 0000000000005968 R15: 0000200000000300 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x55780 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) page_type: f0(buddy) raw: 04fff00000000000 ffff88805ffd6f08 ffff88805ffd6f08 0000000000000000 raw: 0000000000000000 0000000000000005 00000000f0000000 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 5335, tgid 5335 (bch-reclaim/loo), ts 71970739145, free_ts 72095148980 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1d8/0x230 mm/page_alloc.c:1718 prep_new_page mm/page_alloc.c:1726 [inline] get_page_from_freelist+0x21ce/0x22b0 mm/page_alloc.c:3688 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4970 __alloc_pages_noprof+0xa/0x30 mm/page_alloc.c:5004 __alloc_pages_node_noprof include/linux/gfp.h:284 [inline] alloc_pages_node_noprof include/linux/gfp.h:311 [inline] ___kmalloc_large_node+0x85/0x200 mm/slub.c:4285 __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:4313 __do_kmalloc_node mm/slub.c:4329 [inline] __kvmalloc_node_noprof+0x74/0x5e0 mm/slub.c:5026 btree_bounce_alloc fs/bcachefs/btree_io.c:124 [inline] btree_node_sort+0x65d/0x1790 fs/bcachefs/btree_io.c:323 bch2_btree_post_write_cleanup+0x11f/0xab0 fs/bcachefs/btree_io.c:2508 bch2_btree_node_write_trans+0x17b/0x760 fs/bcachefs/btree_io.c:2577 btree_node_write_if_need fs/bcachefs/btree_io.h:157 [inline] __btree_node_flush+0x323/0x430 fs/bcachefs/btree_trans_commit.c:253 bch2_btree_node_flush0+0x27/0x40 fs/bcachefs/btree_trans_commit.c:262 journal_flush_pins+0x8e0/0xe90 fs/bcachefs/journal_reclaim.c:589 __bch2_journal_reclaim+0x781/0xd10 fs/bcachefs/journal_reclaim.c:720 bch2_journal_reclaim_thread+0x177/0x4f0 fs/bcachefs/journal_reclaim.c:762 kthread+0x70e/0x8a0 kernel/kthread.c:464 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:1262 [inline] __free_pages_ok+0x916/0xac0 mm/page_alloc.c:1438 __folio_put+0x21b/0x2c0 mm/swap.c:112 folio_put include/linux/mm.h:1580 [inline] free_large_kmalloc+0x145/0x200 mm/slub.c:4781 btree_bounce_free fs/bcachefs/btree_io.c:112 [inline] btree_node_sort+0x1149/0x1790 fs/bcachefs/btree_io.c:380 bch2_btree_post_write_cleanup+0x11f/0xab0 fs/bcachefs/btree_io.c:2508 bch2_btree_node_prep_for_write+0x341/0x660 fs/bcachefs/btree_trans_commit.c:93 bch2_trans_lock_write+0x669/0xbb0 fs/bcachefs/btree_trans_commit.c:129 do_bch2_trans_commit fs/bcachefs/btree_trans_commit.c:840 [inline] __bch2_trans_commit+0x2cb3/0x8ae0 fs/bcachefs/btree_trans_commit.c:1050 bch2_trans_commit fs/bcachefs/btree_update.h:195 [inline] check_dirent fs/bcachefs/fsck.c:2242 [inline] bch2_check_dirents+0x195e/0x23e0 fs/bcachefs/fsck.c:2272 bch2_run_recovery_pass+0xdf/0x1d0 fs/bcachefs/recovery_passes.c:226 bch2_run_recovery_passes+0x2be/0xaf0 fs/bcachefs/recovery_passes.c:285 bch2_fs_recovery+0x26c8/0x37b0 fs/bcachefs/recovery.c:973 bch2_fs_start+0x32a/0x680 fs/bcachefs/super.c:1065 bch2_fs_get_tree+0xd99/0x1340 fs/bcachefs/fs.c:2253 vfs_get_tree+0x8f/0x2b0 fs/super.c:1759 do_new_mount+0x249/0xa50 fs/namespace.c:3881 Memory state around the buggy address: ffff888055780000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888055780080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888055780100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888055780180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888055780200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================