bcachefs (loop0): recovering from clean shutdown, journal seq 13 bcachefs (loop0): Doing compatible version upgrade from 1.7: mi_btree_bitmap to 1.9: disk_accounting_v2 running recovery passes: check_allocations ================================================================== BUG: KASAN: slab-use-after-free in bch2_fs_recovery+0xe85/0x38e0 fs/bcachefs/recovery.c:705 Read of size 8 at addr ffff88802cd0af98 by task syz-executor.0/7330 CPU: 0 UID: 0 PID: 7330 Comm: syz-executor.0 Not tainted 6.10.0-rc4-next-20240620-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 bch2_fs_recovery+0xe85/0x38e0 fs/bcachefs/recovery.c:705 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1034 bch2_fs_get_tree+0xd42/0x16c0 fs/bcachefs/fs.c:1921 vfs_get_tree+0x90/0x2a0 fs/super.c:1789 do_new_mount+0x2be/0xb40 fs/namespace.c:3379 do_mount fs/namespace.c:3719 [inline] __do_sys_mount fs/namespace.c:3925 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3902 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: 0033:0x7f9bc327e62a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 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:00007f9bc3f2aef8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f9bc3f2af80 RCX: 00007f9bc327e62a RDX: 000000002000f640 RSI: 000000002000f680 RDI: 00007f9bc3f2af40 RBP: 000000002000f640 R08: 00007f9bc3f2af80 R09: 0000000000200012 R10: 0000000000200012 R11: 0000000000000202 R12: 000000002000f680 R13: 00007f9bc3f2af40 R14: 000000000000f62a R15: 00000000200000c0 Allocated by task 7330: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4145 [inline] kmalloc_node_track_caller_noprof+0x225/0x440 mm/slub.c:4165 __do_krealloc mm/slab_common.c:1183 [inline] krealloc_noprof+0x7d/0x120 mm/slab_common.c:1216 bch2_sb_realloc+0x2f5/0x660 fs/bcachefs/super-io.c:189 __copy_super+0x5dc/0xe70 fs/bcachefs/super-io.c:579 bch2_sb_to_fs+0xab/0x150 fs/bcachefs/super-io.c:606 bch2_fs_alloc+0xd50/0x20a0 fs/bcachefs/super.c:826 bch2_fs_open+0x8cc/0xdf0 fs/bcachefs/super.c:2109 bch2_fs_get_tree+0x750/0x16c0 fs/bcachefs/fs.c:1908 vfs_get_tree+0x90/0x2a0 fs/super.c:1789 do_new_mount+0x2be/0xb40 fs/namespace.c:3379 do_mount fs/namespace.c:3719 [inline] __do_sys_mount fs/namespace.c:3925 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3902 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 Freed by task 7330: 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:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2218 [inline] slab_free mm/slub.c:4460 [inline] kfree+0x149/0x360 mm/slub.c:4581 krealloc_noprof+0xcf/0x120 bch2_sb_realloc+0x2f5/0x660 fs/bcachefs/super-io.c:189 bch2_sb_field_resize_id+0x140/0x7c0 fs/bcachefs/super-io.c:221 bch2_sb_counters_from_cpu+0xac/0x300 fs/bcachefs/sb-counters.c:67 bch2_write_super+0xe80/0x3c80 fs/bcachefs/super-io.c:967 bch2_fs_recovery+0xe6c/0x38e0 fs/bcachefs/recovery.c:703 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1034 bch2_fs_get_tree+0xd42/0x16c0 fs/bcachefs/fs.c:1921 vfs_get_tree+0x90/0x2a0 fs/super.c:1789 do_new_mount+0x2be/0xb40 fs/namespace.c:3379 do_mount fs/namespace.c:3719 [inline] __do_sys_mount fs/namespace.c:3925 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3902 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 The buggy address belongs to the object at ffff88802cd0a000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 3992 bytes inside of freed 4096-byte region [ffff88802cd0a000, ffff88802cd0b000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2cd08 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 00fff00000000040 ffff888015042140 ffffea00016c8800 dead000000000002 raw: 0000000000000000 0000000000040004 00000001ffffefff 0000000000000000 head: 00fff00000000040 ffff888015042140 ffffea00016c8800 dead000000000002 head: 0000000000000000 0000000000040004 00000001ffffefff 0000000000000000 head: 00fff00000000003 ffffea0000b34201 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 12182057446, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1495 prep_new_page mm/page_alloc.c:1503 [inline] get_page_from_freelist+0x2cbd/0x2d70 mm/page_alloc.c:3482 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4740 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2287 allocate_slab+0x5a/0x2f0 mm/slub.c:2450 new_slab mm/slub.c:2503 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3689 __slab_alloc+0x58/0xa0 mm/slub.c:3779 __slab_alloc_node mm/slub.c:3832 [inline] slab_alloc_node mm/slub.c:4012 [inline] __kmalloc_cache_noprof+0x1d5/0x2c0 mm/slub.c:4171 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] kobject_uevent_env+0x28b/0x8e0 lib/kobject_uevent.c:540 kernel_add_sysfs_param+0x10a/0x130 kernel/params.c:821 param_sysfs_builtin+0x16e/0x1f0 kernel/params.c:856 param_sysfs_builtin_init+0x31/0x40 kernel/params.c:990 do_one_initcall+0x248/0x880 init/main.c:1267 do_initcall_level+0x157/0x210 init/main.c:1329 do_initcalls+0x3f/0x80 init/main.c:1345 kernel_init_freeable+0x435/0x5d0 init/main.c:1578 page_owner free stack trace missing Memory state around the buggy address: ffff88802cd0ae80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802cd0af00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802cd0af80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802cd0b000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802cd0b080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================