loop0: detected capacity change from 0 to 32768
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BUG: KASAN: slab-out-of-bounds in bch2_sb_downgrade_to_text+0x15ab/0x1f70 fs/bcachefs/sb-downgrade.c:185
Read of size 2 at addr ffff88801bfe2000 by task syz-executor220/5085

CPU: 0 PID: 5085 Comm: syz-executor220 Not tainted 6.9.0-rc7-syzkaller-00183-gcf87f46fd34d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
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+0x15ab/0x1f70 fs/bcachefs/sb-downgrade.c:185
 bch2_sb_field_validate+0x1f7/0x2d0 fs/bcachefs/super-io.c:1228
 bch2_sb_validate+0xa79/0xe10 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:1903
 legacy_get_tree+0xee/0x190 fs/fs_context.c:662
 vfs_get_tree+0x90/0x2a0 fs/super.c:1779
 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: 0033:0x7f6b90edd8ba
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:00007ffc62a5ccd8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc62a5ccf0 RCX: 00007f6b90edd8ba
RDX: 0000000020011a00 RSI: 0000000020011a40 RDI: 00007ffc62a5ccf0
RBP: 0000000000000010 R08: 00007ffc62a5cd30 R09: 00000000000119ef
R10: 0000000000000010 R11: 0000000000000282 R12: 0000000000000004
R13: 00007ffc62a5cd30 R14: 0000000000000003 R15: 0000000001000000
 </TASK>

Allocated by task 5085:
 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:3972 [inline]
 __kmalloc_node_track_caller+0x24e/0x4f0 mm/slub.c:3992
 __do_krealloc mm/slab_common.c:1192 [inline]
 krealloc+0x7d/0x120 mm/slab_common.c:1225
 bch2_sb_realloc+0x2fc/0x660 fs/bcachefs/super-io.c:189
 read_one_super+0x757/0x3400 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:1903
 legacy_get_tree+0xee/0x190 fs/fs_context.c:662
 vfs_get_tree+0x90/0x2a0 fs/super.c:1779
 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 ffff88801bfe0000
 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 [ffff88801bfe0000, ffff88801bfe2000)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1bfe0
head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888015042280 ffffea00006ff000 dead000000000004
raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000
head: 00fff00000000840 ffff888015042280 ffffea00006ff000 dead000000000004
head: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000
head: 00fff00000000003 ffffea00006ff801 ffffea00006ff848 00000000ffffffff
head: 0000000800000000 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 8266774310, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1534
 prep_new_page mm/page_alloc.c:1541 [inline]
 get_page_from_freelist+0x3410/0x35b0 mm/page_alloc.c:3317
 __alloc_pages+0x256/0x6c0 mm/page_alloc.c:4575
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page+0x5f/0x160 mm/slub.c:2180
 allocate_slab mm/slub.c:2343 [inline]
 new_slab+0x84/0x2f0 mm/slub.c:2396
 ___slab_alloc+0xc73/0x1260 mm/slub.c:3530
 __slab_alloc mm/slub.c:3615 [inline]
 __slab_alloc_node mm/slub.c:3668 [inline]
 slab_alloc_node mm/slub.c:3841 [inline]
 __do_kmalloc_node mm/slub.c:3971 [inline]
 __kmalloc+0x2e5/0x4a0 mm/slub.c:3985
 acpi_ut_initialize_buffer+0x1d1/0x2c0
 acpi_rs_create_pci_routing_table+0x116/0xa50 drivers/acpi/acpica/rscreate.c:212
 acpi_rs_get_prt_method_data+0xe8/0x140 drivers/acpi/acpica/rsutils.c:456
 acpi_pci_irq_find_prt_entry+0x16e/0xdf0 drivers/acpi/pci_irq.c:214
 acpi_pci_irq_lookup+0xb0/0x7b0 drivers/acpi/pci_irq.c:298
 acpi_pci_irq_enable+0x23a/0x9a0 drivers/acpi/pci_irq.c:413
 do_pci_enable_device+0x214/0x4a0 drivers/pci/pci.c:2022
 pci_enable_device_flags+0x590/0x720 drivers/pci/pci.c:2107
 virtio_pci_probe+0x15e/0x300 drivers/virtio/virtio_pci_common.c:574
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88801bfe1f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88801bfe1f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88801bfe2000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88801bfe2080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801bfe2100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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