================================================================== BUG: KASAN: slab-use-after-free in bch2_sb_errors_from_cpu+0x255/0x280 fs/bcachefs/sb-errors.c:122 Read of size 8 at addr ffff888020ee8d80 by task kworker/u32:9/1100 CPU: 0 PID: 1100 Comm: kworker/u32:9 Not tainted 6.10.0-rc4-syzkaller-00164-g66cc544fd75c #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Workqueue: btree_update btree_interior_update_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 bch2_sb_errors_from_cpu+0x255/0x280 fs/bcachefs/sb-errors.c:122 bch2_write_super+0x12b2/0x37a0 fs/bcachefs/super-io.c:969 btree_update_new_nodes_mark_sb fs/bcachefs/btree_update_interior.c:626 [inline] btree_update_nodes_written fs/bcachefs/btree_update_interior.c:688 [inline] btree_interior_update_work+0x46e/0x2cb0 fs/bcachefs/btree_update_interior.c:859 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 5402: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4122 [inline] __kmalloc_node_noprof+0x215/0x440 mm/slub.c:4129 kmalloc_node_noprof include/linux/slab.h:681 [inline] kvmalloc_node_noprof+0x9d/0x1a0 mm/util.c:634 kvmalloc_array_node_noprof include/linux/slab.h:800 [inline] __bch2_darray_resize+0xd8/0x250 fs/bcachefs/darray.c:12 __darray_resize fs/bcachefs/darray.h:31 [inline] __darray_make_room fs/bcachefs/darray.h:43 [inline] bch2_sb_error_count+0x34f/0x4e0 fs/bcachefs/sb-errors.c:102 __bch2_inode_invalid+0x2c6/0x4d0 fs/bcachefs/inode.c:441 bch2_inode_v3_invalid+0x1f1/0x2e0 fs/bcachefs/inode.c:529 bch2_bkey_val_invalid+0x222/0x2f0 fs/bcachefs/bkey_methods.c:143 bch2_btree_node_read_done+0x3294/0x4fe0 fs/bcachefs/btree_io.c:1232 btree_node_read_work+0x567/0x1060 fs/bcachefs/btree_io.c:1345 bch2_btree_node_read+0x8b3/0xe40 fs/bcachefs/btree_io.c:1730 __bch2_btree_root_read fs/bcachefs/btree_io.c:1769 [inline] bch2_btree_root_read+0x2ca/0x690 fs/bcachefs/btree_io.c:1793 read_btree_roots fs/bcachefs/recovery.c:475 [inline] bch2_fs_recovery+0x1ba8/0x3db0 fs/bcachefs/recovery.c:803 bch2_fs_start+0x2e9/0x600 fs/bcachefs/super.c:1035 bch2_fs_open+0xfa0/0x1110 fs/bcachefs/super.c:2127 bch2_mount+0xe2c/0x1230 fs/bcachefs/fs.c:1919 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1780 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x14e6/0x1f20 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __x64_sys_mount+0x297/0x320 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5402: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2196 [inline] slab_free mm/slub.c:4437 [inline] kfree+0x12a/0x3b0 mm/slub.c:4558 kvfree+0x47/0x50 mm/util.c:680 __bch2_darray_resize+0x185/0x250 fs/bcachefs/darray.c:18 __darray_resize fs/bcachefs/darray.h:31 [inline] __darray_make_room fs/bcachefs/darray.h:43 [inline] bch2_sb_error_count+0x34f/0x4e0 fs/bcachefs/sb-errors.c:102 bch2_fsck_err+0x180/0x1730 fs/bcachefs/error.c:210 bch2_bucket_ref_update+0xcd3/0xf80 fs/bcachefs/buckets.c:834 __mark_pointer+0x10c/0x410 fs/bcachefs/buckets.c:1000 bch2_trigger_pointer.constprop.0+0xce4/0x25c0 fs/bcachefs/buckets.c:1037 __trigger_extent+0x414/0xc00 fs/bcachefs/buckets.c:1176 bch2_trigger_extent+0x4ee/0x5d0 fs/bcachefs/buckets.c:1261 bch2_key_trigger fs/bcachefs/bkey_methods.h:88 [inline] bch2_key_trigger_new fs/bcachefs/bkey_methods.h:116 [inline] run_one_trans_trigger fs/bcachefs/btree_trans_commit.c:517 [inline] run_btree_triggers+0x6f1/0xd10 fs/bcachefs/btree_trans_commit.c:544 bch2_trans_commit_run_triggers fs/bcachefs/btree_trans_commit.c:576 [inline] __bch2_trans_commit+0x366/0x7ad0 fs/bcachefs/btree_trans_commit.c:1022 bch2_trans_commit fs/bcachefs/btree_update.h:170 [inline] bch2_extent_update+0x494/0xa40 fs/bcachefs/io_write.c:326 bch2_fpunch_at+0x7e6/0xbc0 fs/bcachefs/io_misc.c:184 __bch2_resume_logged_op_truncate+0x4ce/0x7a0 fs/bcachefs/io_misc.c:260 bch2_truncate+0x1e1/0x220 fs/bcachefs/io_misc.c:291 bchfs_truncate+0x90c/0xd70 fs/bcachefs/fs-io.c:476 bch2_setattr+0x1ab/0x250 fs/bcachefs/fs.c:918 notify_change+0x742/0x11f0 fs/attr.c:497 do_truncate+0x15c/0x220 fs/open.c:65 vfs_truncate+0x3ef/0x4e0 fs/open.c:111 do_sys_truncate fs/open.c:134 [inline] __do_sys_truncate fs/open.c:146 [inline] __se_sys_truncate fs/open.c:144 [inline] __x64_sys_truncate+0x177/0x1f0 fs/open.c:144 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888020ee8d80 which belongs to the cache kmalloc-16 of size 16 The buggy address is located 0 bytes inside of freed 16-byte region [ffff888020ee8d80, ffff888020ee8d90) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888020ee8040 pfn:0x20ee8 flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 00fff00000000200 ffff888015442640 ffffea000098db50 ffffea0000a6e950 raw: ffff888020ee8040 0000000000800068 00000001ffffefff 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 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 21361014922, free_ts 21352580976 create_dummy_stack mm/page_owner.c:94 [inline] register_dummy_stack+0x8a/0xd0 mm/page_owner.c:100 init_page_owner+0x48/0xbf0 mm/page_owner.c:118 invoke_init_callbacks mm/page_ext.c:148 [inline] page_ext_init+0x6af/0xaa0 mm/page_ext.c:493 mm_core_init+0x68d/0x740 mm/mm_init.c:2725 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1088 [inline] free_unref_page+0x64a/0xe40 mm/page_alloc.c:2583 __put_partials+0x14c/0x170 mm/slub.c:2995 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3941 [inline] slab_alloc_node mm/slub.c:4001 [inline] __do_kmalloc_node mm/slub.c:4121 [inline] kmalloc_node_track_caller_noprof+0x1c1/0x430 mm/slub.c:4142 __do_krealloc mm/slab_common.c:1183 [inline] krealloc_noprof+0x5d/0x100 mm/slab_common.c:1216 add_sysfs_param+0xcb/0x960 kernel/params.c:654 kernel_add_sysfs_param kernel/params.c:817 [inline] param_sysfs_builtin kernel/params.c:856 [inline] param_sysfs_builtin_init+0x2ce/0x460 kernel/params.c:990 do_one_initcall+0x128/0x700 init/main.c:1267 do_initcall_level init/main.c:1329 [inline] do_initcalls init/main.c:1345 [inline] do_basic_setup init/main.c:1364 [inline] kernel_init_freeable+0x69d/0xca0 init/main.c:1578 kernel_init+0x1c/0x2b0 init/main.c:1467 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff888020ee8c80: 00 00 fc fc 00 00 fc fc fa fb fc fc 00 00 fc fc ffff888020ee8d00: 00 00 fc fc 00 00 fc fc 00 00 fc fc 00 00 fc fc >ffff888020ee8d80: fa fb fc fc fa fb fc fc 00 00 fc fc 00 00 fc fc ^ ffff888020ee8e00: 00 00 fc fc fa fb fc fc fa fb fc fc fa fb fc fc ffff888020ee8e80: 00 00 fc fc fa fb fc fc 00 00 fc fc fa fb fc fc ==================================================================