loop3: detected capacity change from 0 to 32768
bcachefs (/dev/loop3): error reading default superblock: checksum error, type none: got  should be 
==================================================================
BUG: KASAN: slab-out-of-bounds in journal_entry_dev_usage_to_text+0x120/0x1b4 fs/bcachefs/journal_io.c:717
Read of size 8 at addr ffff0000cd506000 by task syz.3.213/7329

CPU: 1 UID: 0 PID: 7329 Comm: syz.3.213 Not tainted 6.12.0-rc7-syzkaller-g887407160d72 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:484 (C)
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x198/0x538 mm/kasan/report.c:488
 kasan_report+0xd8/0x138 mm/kasan/report.c:601
 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381
 journal_entry_dev_usage_to_text+0x120/0x1b4 fs/bcachefs/journal_io.c:717
 bch2_journal_entry_to_text+0x2fc/0x5a8 fs/bcachefs/journal_io.c:842
 bch2_sb_clean_to_text+0x130/0x224 fs/bcachefs/sb-clean.c:252
 __bch2_sb_field_to_text fs/bcachefs/super-io.c:1261 [inline]
 bch2_sb_field_to_text+0x1a4/0x234 fs/bcachefs/super-io.c:1277
 bch2_sb_field_validate+0x1d8/0x2a8 fs/bcachefs/super-io.c:1244
 bch2_sb_validate+0x9f0/0xd04 fs/bcachefs/super-io.c:480
 __bch2_read_super+0xa18/0x1020 fs/bcachefs/super-io.c:837
 bch2_read_super+0x38/0x4c fs/bcachefs/super-io.c:857
 bch2_fs_open+0x20c/0x27c4 fs/bcachefs/super.c:2032
 bch2_fs_get_tree+0x53c/0x1030 fs/bcachefs/fs.c:2157
 vfs_get_tree+0x90/0x28c fs/super.c:1814
 do_new_mount+0x278/0x900 fs/namespace.c:3507
 path_mount+0x590/0xe04 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount fs/namespace.c:4034 [inline]
 __arm64_sys_mount+0x4d4/0x5ac fs/namespace.c:4034
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

Allocated by task 7329:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:68
 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:257 [inline]
 __do_kmalloc_node mm/slub.c:4264 [inline]
 __kmalloc_node_track_caller_noprof+0x2d0/0x4d8 mm/slub.c:4283
 __do_krealloc mm/slab_common.c:1229 [inline]
 krealloc_noprof+0x94/0x170 mm/slab_common.c:1278
 bch2_sb_realloc+0x25c/0x53c fs/bcachefs/super-io.c:189
 read_one_super+0x690/0x2310 fs/bcachefs/super-io.c:672
 __bch2_read_super+0x718/0x1020 fs/bcachefs/super-io.c:763
 bch2_read_super+0x38/0x4c fs/bcachefs/super-io.c:857
 bch2_fs_open+0x20c/0x27c4 fs/bcachefs/super.c:2032
 bch2_fs_get_tree+0x53c/0x1030 fs/bcachefs/fs.c:2157
 vfs_get_tree+0x90/0x28c fs/super.c:1814
 do_new_mount+0x278/0x900 fs/namespace.c:3507
 path_mount+0x590/0xe04 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount fs/namespace.c:4034 [inline]
 __arm64_sys_mount+0x4d4/0x5ac fs/namespace.c:4034
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

The buggy address belongs to the object at ffff0000cd504000
 which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 0 bytes to the right of
 allocated 8192-byte region [ffff0000cd504000, ffff0000cd506000)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10d500
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
ksm flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 05ffc00000000040 ffff0000c0002280 fffffdffc362a200 dead000000000003
raw: 0000000000000000 0000000000020002 00000001f5000000 0000000000000000
head: 05ffc00000000040 ffff0000c0002280 fffffdffc362a200 dead000000000003
head: 0000000000000000 0000000000020002 00000001f5000000 0000000000000000
head: 05ffc00000000003 fffffdffc3354001 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000cd505f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000cd505f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000cd506000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff0000cd506080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000cd506100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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