bcachefs (loop2): hash table key at wrong offset: should be at 8607060773457356477 u64s 7 type dirent 4096:4330382808765833931:U32_MAX len 0 ver 0:  -> 536870912 type unknown, fixing ================================================================== BUG: KASAN: slab-use-after-free in bch2_str_hash_repair_key+0x2d42/0x3fa0 fs/bcachefs/str_hash.c:335 Read of size 8 at addr ffff888026f4a928 by task syz-executor/5824 CPU: 1 UID: 0 PID: 5824 Comm: syz-executor Not tainted 6.16.0-rc1-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xd2/0x2b0 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 bch2_str_hash_repair_key+0x2d42/0x3fa0 fs/bcachefs/str_hash.c:335 __bch2_str_hash_check_key+0xa65/0xd40 fs/bcachefs/str_hash.c:394 bch2_str_hash_check_key fs/bcachefs/str_hash.h:429 [inline] bch2_readdir+0x11cd/0x16f0 fs/bcachefs/dirent.c:685 bch2_vfs_readdir+0x4d0/0x6c0 fs/bcachefs/fs.c:1581 iterate_dir+0x5af/0x770 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:410 [inline] __se_sys_getdents64+0xe4/0x260 fs/readdir.c:396 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2e233c1293 Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 72 3e f8 ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 a8 ff ff ff f7 d8 RSP: 002b:00007ffdb258dc28 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 000055557ee50600 RCX: 00007f2e233c1293 RDX: 0000000000008000 RSI: 000055557ee50600 RDI: 0000000000000005 RBP: 000055557ee505d4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffa8 R13: 0000000000000010 R14: 000055557ee505d0 R15: 00007ffdb258fee0 Allocated by task 5824: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4328 [inline] __kmalloc_node_track_caller_noprof+0x271/0x4e0 mm/slub.c:4347 __do_krealloc mm/slub.c:4905 [inline] krealloc_noprof+0x124/0x340 mm/slub.c:4958 __bch2_trans_kmalloc+0x26c/0xc80 fs/bcachefs/btree_iter.c:3187 bch2_trans_kmalloc_ip fs/bcachefs/btree_iter.h:604 [inline] bch2_trans_kmalloc fs/bcachefs/btree_iter.h:616 [inline] bch2_str_hash_repair_key+0x2a65/0x3fa0 fs/bcachefs/str_hash.c:251 __bch2_str_hash_check_key+0xa65/0xd40 fs/bcachefs/str_hash.c:394 bch2_str_hash_check_key fs/bcachefs/str_hash.h:429 [inline] bch2_readdir+0x11cd/0x16f0 fs/bcachefs/dirent.c:685 bch2_vfs_readdir+0x4d0/0x6c0 fs/bcachefs/fs.c:1581 iterate_dir+0x5af/0x770 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:410 [inline] __se_sys_getdents64+0xe4/0x260 fs/readdir.c:396 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5824: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2381 [inline] slab_free mm/slub.c:4643 [inline] kfree+0x18e/0x440 mm/slub.c:4842 krealloc_noprof+0x1cd/0x340 mm/slub.c:-1 __bch2_trans_kmalloc+0x26c/0xc80 fs/bcachefs/btree_iter.c:3187 bch2_trans_kmalloc_nomemzero_ip fs/bcachefs/btree_iter.h:586 [inline] bch2_trans_kmalloc_nomemzero fs/bcachefs/btree_iter.h:621 [inline] __bch2_bkey_make_mut_noupdate fs/bcachefs/btree_update.h:285 [inline] bch2_bkey_make_mut_noupdate fs/bcachefs/btree_update.h:300 [inline] bch2_str_hash_repair_key+0x2a96/0x3fa0 fs/bcachefs/str_hash.c:267 __bch2_str_hash_check_key+0xa65/0xd40 fs/bcachefs/str_hash.c:394 bch2_str_hash_check_key fs/bcachefs/str_hash.h:429 [inline] bch2_readdir+0x11cd/0x16f0 fs/bcachefs/dirent.c:685 bch2_vfs_readdir+0x4d0/0x6c0 fs/bcachefs/fs.c:1581 iterate_dir+0x5af/0x770 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:410 [inline] __se_sys_getdents64+0xe4/0x260 fs/readdir.c:396 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888026f4a900 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 40 bytes inside of freed 64-byte region [ffff888026f4a900, ffff888026f4a940) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26f4a ksm flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801a4418c0 ffffea0000bc4240 dead000000000007 raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 36, tgid 36 (kworker/u8:2), ts 10306401868, free_ts 10306377702 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x21d5/0x22b0 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419 alloc_slab_page mm/slub.c:2451 [inline] allocate_slab+0x8a/0x3b0 mm/slub.c:2619 new_slab mm/slub.c:2673 [inline] ___slab_alloc+0xbfc/0x1480 mm/slub.c:3859 __slab_alloc mm/slub.c:3949 [inline] __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kmalloc_node_noprof+0x2fd/0x4e0 mm/slub.c:4334 kmalloc_node_noprof include/linux/slab.h:932 [inline] __vmalloc_area_node mm/vmalloc.c:3690 [inline] __vmalloc_node_range_noprof+0x5a9/0x12f0 mm/vmalloc.c:3885 __vmalloc_node_noprof+0xc2/0x110 mm/vmalloc.c:3948 alloc_thread_stack_node kernel/fork.c:317 [inline] dup_task_struct+0x3e7/0x860 kernel/fork.c:877 copy_process+0x54b/0x3c00 kernel/fork.c:1999 kernel_clone+0x224/0x7f0 kernel/fork.c:2599 user_mode_thread+0xdd/0x140 kernel/fork.c:2677 call_usermodehelper_exec_work+0x5c/0x230 kernel/umh.c:171 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 page last free pid 36 tgid 36 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0xc65/0xe60 mm/page_alloc.c:2706 __kasan_populate_vmalloc mm/kasan/shadow.c:383 [inline] kasan_populate_vmalloc+0x18a/0x1a0 mm/kasan/shadow.c:417 alloc_vmap_area+0xd51/0x1490 mm/vmalloc.c:2084 __get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3179 __vmalloc_node_range_noprof+0x301/0x12f0 mm/vmalloc.c:3845 __vmalloc_node_noprof+0xc2/0x110 mm/vmalloc.c:3948 alloc_thread_stack_node kernel/fork.c:317 [inline] dup_task_struct+0x3e7/0x860 kernel/fork.c:877 copy_process+0x54b/0x3c00 kernel/fork.c:1999 kernel_clone+0x224/0x7f0 kernel/fork.c:2599 user_mode_thread+0xdd/0x140 kernel/fork.c:2677 call_usermodehelper_exec_work+0x5c/0x230 kernel/umh.c:171 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888026f4a800: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888026f4a880: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888026f4a900: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888026f4a980: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888026f4aa00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================