loop0: detected capacity change from 0 to 32768 ================================================================== BUG: KASAN: slab-out-of-bounds in bch2_sb_downgrade_to_text+0xe67/0x1e10 fs/bcachefs/sb-downgrade.c:104 Read of size 2 at addr ffff8881772f2000 by task syz-executor.0/2377 CPU: 1 PID: 2377 Comm: syz-executor.0 Not tainted 6.7.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xf8/0x260 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x167/0x540 mm/kasan/report.c:475 kasan_report+0x142/0x180 mm/kasan/report.c:588 bch2_sb_downgrade_to_text+0xe67/0x1e10 fs/bcachefs/sb-downgrade.c:104 bch2_sb_field_to_text+0x162/0x200 fs/bcachefs/super-io.c:1194 bch2_sb_field_validate+0x1b5/0x270 fs/bcachefs/super-io.c:1168 bch2_sb_validate+0x73d/0x910 fs/bcachefs/super-io.c:489 bch2_read_super+0x69a/0x11a0 fs/bcachefs/super-io.c:823 bch2_fs_open+0x2c7/0x2b10 fs/bcachefs/super.c:1922 bch2_mount+0x561/0x1080 fs/bcachefs/fs.c:1835 legacy_get_tree+0xe9/0x180 fs/fs_context.c:662 vfs_get_tree+0x82/0x190 fs/super.c:1771 do_new_mount+0x1e5/0x930 fs/namespace.c:3337 do_mount fs/namespace.c:3677 [inline] __do_sys_mount fs/namespace.c:3886 [inline] __se_sys_mount+0x242/0x2e0 fs/namespace.c:3863 do_syscall_64+0x4d/0x120 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f596627f3aa 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:00007f59670c6ef8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f59670c6f80 RCX: 00007f596627f3aa RDX: 0000000020011a00 RSI: 0000000020000000 RDI: 00007f59670c6f40 RBP: 0000000020011a00 R08: 00007f59670c6f80 R09: 0000000003a04000 R10: 0000000003a04000 R11: 0000000000000246 R12: 0000000020000000 R13: 00007f59670c6f40 R14: 0000000000011a04 R15: 0000000020000600 Allocated by task 2377: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x80 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc_node_track_caller+0xab/0x1d0 mm/slab_common.c:1027 __do_krealloc mm/slab_common.c:1395 [inline] krealloc+0x7d/0x120 mm/slab_common.c:1428 bch2_sb_realloc+0x1bd/0x370 fs/bcachefs/super-io.c:207 read_one_super+0x6c2/0xd90 fs/bcachefs/super-io.c:670 bch2_read_super+0x54d/0x11a0 fs/bcachefs/super-io.c:756 bch2_fs_open+0x2c7/0x2b10 fs/bcachefs/super.c:1922 bch2_mount+0x561/0x1080 fs/bcachefs/fs.c:1835 legacy_get_tree+0xe9/0x180 fs/fs_context.c:662 vfs_get_tree+0x82/0x190 fs/super.c:1771 do_new_mount+0x1e5/0x930 fs/namespace.c:3337 do_mount fs/namespace.c:3677 [inline] __do_sys_mount fs/namespace.c:3886 [inline] __se_sys_mount+0x242/0x2e0 fs/namespace.c:3863 do_syscall_64+0x4d/0x120 entry_SYSCALL_64_after_hwframe+0x6f/0x77 The buggy address belongs to the object at ffff8881772f0000 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 [ffff8881772f0000, ffff8881772f2000) The buggy address belongs to the physical page: page:ffffea0005dcbc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1772f0 head:ffffea0005dcbc00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0x100000000000840(slab|head|node=0|zone=2) page_type: 0xffffffff() raw: 0100000000000840 ffff888100042280 0000000000000000 0000000000000001 raw: 0000000000000000 0000000000020002 00000001ffffffff 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 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1451, tgid 1451 (sh), ts 25066330815, free_ts 25029055594 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x10f/0x130 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1544 [inline] get_page_from_freelist+0x3e5f/0x4080 mm/page_alloc.c:3312 __alloc_pages+0x255/0x650 mm/page_alloc.c:4568 alloc_pages_mpol+0x27f/0x4d0 mm/mempolicy.c:2133 alloc_slab_page+0x6a/0x170 mm/slub.c:1870 allocate_slab mm/slub.c:2017 [inline] new_slab+0x70/0x270 mm/slub.c:2070 ___slab_alloc+0x94b/0xee0 mm/slub.c:3223 __slab_alloc mm/slub.c:3322 [inline] __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] __kmem_cache_alloc_node+0x1fb/0x2c0 mm/slub.c:3517 kmalloc_trace+0x2a/0xc0 mm/slab_common.c:1098 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] tomoyo_print_bprm security/tomoyo/audit.c:26 [inline] tomoyo_init_log+0x10ad/0x1fe0 security/tomoyo/audit.c:264 tomoyo_supervisor+0x316/0xfb0 security/tomoyo/common.c:2089 tomoyo_find_next_domain+0x2c7/0x1700 security/tomoyo/domain.c:752 tomoyo_bprm_check_security+0xfa/0x130 security/tomoyo/tomoyo.c:101 security_bprm_check+0x2a/0x80 security/security.c:1103 search_binary_handler fs/exec.c:1725 [inline] exec_binprm fs/exec.c:1779 [inline] bprm_execve+0x87f/0x13b0 fs/exec.c:1854 do_execveat_common+0x44f/0x620 fs/exec.c:1962 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1137 [inline] free_unref_page_prepare+0x7e7/0x900 mm/page_alloc.c:2347 free_unref_page+0x37/0x3a0 mm/page_alloc.c:2487 discard_slab mm/slub.c:2116 [inline] __unfreeze_partials+0x1b1/0x200 mm/slub.c:2655 put_cpu_partial+0x150/0x1b0 mm/slub.c:2731 __slab_free+0x26f/0x330 mm/slub.c:3679 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x67/0x3c0 mm/slab.h:763 slab_alloc_node mm/slub.c:3478 [inline] __kmem_cache_alloc_node+0x1b2/0x2c0 mm/slub.c:3517 kmalloc_trace+0x2a/0xc0 mm/slab_common.c:1098 kmalloc include/linux/slab.h:600 [inline] tomoyo_print_header security/tomoyo/audit.c:156 [inline] tomoyo_init_log+0x1d2/0x1fe0 security/tomoyo/audit.c:255 tomoyo_supervisor+0x316/0xfb0 security/tomoyo/common.c:2089 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline] tomoyo_path_permission security/tomoyo/file.c:587 [inline] tomoyo_check_open_permission+0x679/0x960 security/tomoyo/file.c:780 security_file_open+0x2a/0x90 security/security.c:2836 do_dentry_open+0x2ee/0x11c0 fs/open.c:935 Memory state around the buggy address: ffff8881772f1f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881772f1f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881772f2000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881772f2080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881772f2100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================