bcachefs (loop0): shutting down ================================================================== BUG: KASAN: slab-use-after-free in __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] BUG: KASAN: slab-use-after-free in _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 Read of size 1 at addr ffff8880449ee0d0 by task syz.0.0/5333 CPU: 0 UID: 0 PID: 5333 Comm: syz.0.0 Not tainted 6.14.0-syzkaller-10167-g93d52288679e #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 __kasan_check_byte+0x2c/0x40 mm/kasan/common.c:557 kasan_check_byte include/linux/kasan.h:399 [inline] lock_acquire+0x89/0x2f0 kernel/locking/lockdep.c:5840 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] lockref_get+0x15/0x60 lib/lockref.c:50 dget include/linux/dcache.h:351 [inline] simple_recursive_removal+0x35/0x8f0 fs/libfs.c:610 debugfs_remove+0x49/0x70 fs/debugfs/inode.c:805 __bch2_fs_stop+0x292/0x5b0 fs/bcachefs/super.c:640 bch2_fs_get_tree+0xd39/0x18d0 fs/bcachefs/fs.c:2293 vfs_get_tree+0x90/0x2b0 fs/super.c:1759 do_new_mount+0x2cf/0xb70 fs/namespace.c:3878 do_mount fs/namespace.c:4218 [inline] __do_sys_mount fs/namespace.c:4429 [inline] __se_sys_mount+0x38c/0x400 fs/namespace.c:4406 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: 0033:0x7fdd91b8d169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fdd929a0038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fdd91da6160 RCX: 00007fdd91b8d169 RDX: 00002000000000c0 RSI: 0000200000005b00 RDI: 0000200000005ac0 RBP: 00007fdd91c0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000018642 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fdd91da6160 R15: 00007fff79346128 Allocated by task 5320: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4138 [inline] slab_alloc_node mm/slub.c:4187 [inline] kmem_cache_alloc_lru_noprof+0x1e5/0x390 mm/slub.c:4206 __d_alloc+0x31/0x740 fs/dcache.c:1681 d_alloc fs/dcache.c:1760 [inline] d_alloc_parallel+0xe9/0x1660 fs/dcache.c:2525 __lookup_slow+0x127/0x400 fs/namei.c:1792 lookup_one_len+0x1f3/0x310 fs/namei.c:2920 start_creating+0x187/0x310 fs/debugfs/inode.c:391 debugfs_create_dir+0x25/0x430 fs/debugfs/inode.c:586 bch2_fs_debug_init+0xde/0x4a0 fs/bcachefs/debug.c:931 bch2_fs_online+0x291/0x6a0 fs/bcachefs/super.c:709 bch2_fs_alloc fs/bcachefs/super.c:971 [inline] bch2_fs_open+0x322a/0x32a0 fs/bcachefs/super.c:2182 bch2_fs_get_tree+0x77b/0x18d0 fs/bcachefs/fs.c:2172 vfs_get_tree+0x90/0x2b0 fs/super.c:1759 do_new_mount+0x2cf/0xb70 fs/namespace.c:3878 do_mount fs/namespace.c:4218 [inline] __do_sys_mount fs/namespace.c:4429 [inline] __se_sys_mount+0x38c/0x400 fs/namespace.c:4406 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 Freed by task 15: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2376 [inline] slab_free mm/slub.c:4633 [inline] kmem_cache_free+0x197/0x410 mm/slub.c:4735 rcu_do_batch kernel/rcu/tree.c:2568 [inline] rcu_core+0xaac/0x17a0 kernel/rcu/tree.c:2824 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:561 run_ksoftirqd+0xcf/0x130 kernel/softirq.c:950 smpboot_thread_fn+0x576/0xaa0 kernel/smpboot.c:164 kthread+0x7b7/0x940 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 kasan_record_aux_stack+0xbf/0xd0 mm/kasan/generic.c:548 __call_rcu_common kernel/rcu/tree.c:3082 [inline] call_rcu+0x172/0xad0 kernel/rcu/tree.c:3202 __dentry_kill+0x497/0x630 fs/dcache.c:679 dput+0x19f/0x2b0 fs/dcache.c:902 debugfs_remove+0x49/0x70 fs/debugfs/inode.c:805 __bch2_fs_stop+0x292/0x5b0 fs/bcachefs/super.c:640 bch2_fs_get_tree+0xd39/0x18d0 fs/bcachefs/fs.c:2293 vfs_get_tree+0x90/0x2b0 fs/super.c:1759 do_new_mount+0x2cf/0xb70 fs/namespace.c:3878 do_mount fs/namespace.c:4218 [inline] __do_sys_mount fs/namespace.c:4429 [inline] __se_sys_mount+0x38c/0x400 fs/namespace.c:4406 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 The buggy address belongs to the object at ffff8880449ee000 which belongs to the cache dentry of size 312 The buggy address is located 208 bytes inside of freed 312-byte region [ffff8880449ee000, ffff8880449ee138) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x449ee head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88805351db01 flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000040 ffff8880304098c0 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000150015 00000000f5000000 ffff88805351db01 head: 04fff00000000040 ffff8880304098c0 dead000000000122 0000000000000000 head: 0000000000000000 0000000000150015 00000000f5000000 ffff88805351db01 head: 04fff00000000001 ffffea0001127b81 ffffffffffffffff 0000000000000000 head: 0000000000000002 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Reclaimable, gfp_mask 0xd20d0(__GFP_RECLAIMABLE|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5320, tgid 5319 (syz.0.0), ts 59464851718, free_ts 0 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+0x3695/0x37e0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x2c5/0x7b0 mm/page_alloc.c:4740 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2446 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2610 new_slab mm/slub.c:2663 [inline] ___slab_alloc+0xc3b/0x1500 mm/slub.c:3849 __slab_alloc+0x58/0xa0 mm/slub.c:3939 __slab_alloc_node mm/slub.c:4014 [inline] slab_alloc_node mm/slub.c:4175 [inline] kmem_cache_alloc_lru_noprof+0x274/0x390 mm/slub.c:4206 __d_alloc+0x31/0x740 fs/dcache.c:1681 d_alloc fs/dcache.c:1760 [inline] d_alloc_parallel+0xe9/0x1660 fs/dcache.c:2525 __lookup_slow+0x127/0x400 fs/namei.c:1792 lookup_one_len+0x1f3/0x310 fs/namei.c:2920 start_creating+0x187/0x310 fs/debugfs/inode.c:391 debugfs_create_dir+0x25/0x430 fs/debugfs/inode.c:586 bch2_fs_debug_init+0xde/0x4a0 fs/bcachefs/debug.c:931 bch2_fs_online+0x291/0x6a0 fs/bcachefs/super.c:709 page_owner free stack trace missing Memory state around the buggy address: ffff8880449edf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880449ee000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880449ee080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880449ee100: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fa ffff8880449ee180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================