loop0: detected capacity change from 0 to 32768
==================================================================
BUG: KASAN: slab-out-of-bounds in bch2_sb_downgrade_to_text+0x5c3/0x970 fs/bcachefs/sb-downgrade.c:182
Read of size 2 at addr ffff88802ba62000 by task syz-executor113/5090

CPU: 1 PID: 5090 Comm: syz-executor113 Not tainted 6.9.0-rc6-next-20240503-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 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_sb_downgrade_to_text+0x5c3/0x970 fs/bcachefs/sb-downgrade.c:182
 bch2_sb_field_validate+0x1f7/0x2d0 fs/bcachefs/super-io.c:1208
 bch2_sb_validate+0xa61/0xdf0 fs/bcachefs/super-io.c:468
 __bch2_read_super+0xc9a/0x1460 fs/bcachefs/super-io.c:822
 bch2_fs_open+0x246/0xdf0 fs/bcachefs/super.c:2052
 bch2_mount+0x71d/0x1320 fs/bcachefs/fs.c:1917
 legacy_get_tree+0xee/0x190 fs/fs_context.c:662
 vfs_get_tree+0x90/0x2a0 fs/super.c:1780
 do_new_mount+0x2be/0xb40 fs/namespace.c:3352
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f487ca75b4a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc2cd8eee8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc2cd8ef00 RCX: 00007f487ca75b4a
RDX: 0000000020011a00 RSI: 0000000020000000 RDI: 00007ffc2cd8ef00
RBP: 0000000000000004 R08: 00007ffc2cd8ef40 R09: 00000000000119fe
R10: 0000000003a04000 R11: 0000000000000282 R12: 0000000003a04000
R13: 00007ffc2cd8ef40 R14: 0000000000000003 R15: 0000000001000000
 </TASK>

Allocated by task 5090:
 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:4121 [inline]
 kmalloc_node_track_caller_noprof+0x22a/0x450 mm/slub.c:4141
 __do_krealloc mm/slab_common.c:1183 [inline]
 krealloc_noprof+0x7d/0x120 mm/slab_common.c:1216
 bch2_sb_realloc+0x2fc/0x660 fs/bcachefs/super-io.c:189
 read_one_super+0x77a/0x1080 fs/bcachefs/super-io.c:659
 __bch2_read_super+0x65a/0x1460 fs/bcachefs/super-io.c:750
 bch2_fs_open+0x246/0xdf0 fs/bcachefs/super.c:2052
 bch2_mount+0x71d/0x1320 fs/bcachefs/fs.c:1917
 legacy_get_tree+0xee/0x190 fs/fs_context.c:662
 vfs_get_tree+0x90/0x2a0 fs/super.c:1780
 do_new_mount+0x2be/0xb40 fs/namespace.c:3352
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88802ba60000
 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 [ffff88802ba60000, ffff88802ba62000)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2ba60
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
ksm flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffefff(slab)
raw: 00fff00000000040 ffff888015042280 ffffea0000ad6e00 dead000000000003
raw: 0000000000000000 0000000080020002 00000001ffffefff 0000000000000000
head: 00fff00000000040 ffff888015042280 ffffea0000ad6e00 dead000000000003
head: 0000000000000000 0000000080020002 00000001ffffefff 0000000000000000
head: 00fff00000000003 ffffea0000ae9801 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 10746014565, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1468
 prep_new_page mm/page_alloc.c:1476 [inline]
 get_page_from_freelist+0x2ce2/0x2d90 mm/page_alloc.c:3438
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4696
 __alloc_pages_node_noprof include/linux/gfp.h:244 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:271 [inline]
 alloc_slab_page+0x5f/0x120 mm/slub.c:2264
 allocate_slab+0x5a/0x2e0 mm/slub.c:2427
 new_slab mm/slub.c:2480 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3666
 __slab_alloc+0x58/0xa0 mm/slub.c:3756
 __slab_alloc_node mm/slub.c:3809 [inline]
 slab_alloc_node mm/slub.c:3988 [inline]
 kmalloc_trace_noprof+0x1d5/0x2c0 mm/slub.c:4147
 kmalloc_noprof include/linux/slab.h:660 [inline]
 kzalloc_noprof include/linux/slab.h:778 [inline]
 cryptomgr_schedule_probe crypto/algboss.c:85 [inline]
 cryptomgr_notify+0x84/0xb10 crypto/algboss.c:223
 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
 blocking_notifier_call_chain+0x69/0x90 kernel/notifier.c:388
 crypto_probing_notify crypto/api.c:305 [inline]
 crypto_alg_mod_lookup+0x4ea/0x720 crypto/api.c:335
 crypto_find_alg crypto/api.c:580 [inline]
 crypto_alloc_tfm_node+0x130/0x360 crypto/api.c:617
 crypto_alloc_tfm crypto/internal.h:151 [inline]
 crypto_alloc_sync_skcipher+0x35/0xc0 crypto/skcipher.c:848
 rxkad_init+0x20/0xf0 net/rxrpc/rxkad.c:1221
 rxrpc_init_security+0x8a/0x180 net/rxrpc/security.c:31
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88802ba61f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88802ba61f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88802ba62000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88802ba62080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802ba62100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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