loop3: 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 ffff88807cde2000 by task syz-executor.3/5225 CPU: 0 PID: 5225 Comm: syz-executor.3 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: __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: 0033:0x7f01f807f3aa 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:00007f01f8d0def8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f01f8d0df80 RCX: 00007f01f807f3aa RDX: 0000000020011a00 RSI: 0000000020000000 RDI: 00007f01f8d0df40 RBP: 0000000020011a00 R08: 00007f01f8d0df80 R09: 0000000003a04000 R10: 0000000003a04000 R11: 0000000000000202 R12: 0000000020000000 R13: 00007f01f8d0df40 R14: 0000000000011a04 R15: 0000000020000600 Allocated by task 5225: 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 ffff88807cde0000 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 [ffff88807cde0000, ffff88807cde2000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7cde0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 00fff00000000040 ffff888015042280 ffffea0001fc1600 0000000000000004 raw: 0000000000000000 0000000000020002 00000001ffffefff 0000000000000000 head: 00fff00000000040 ffff888015042280 ffffea0001fc1600 0000000000000004 head: 0000000000000000 0000000000020002 00000001ffffefff 0000000000000000 head: 00fff00000000003 ffffea0001f37801 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 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4942, tgid 4942 (sshd), ts 43348699595, free_ts 35121084695 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] tomoyo_print_bprm security/tomoyo/audit.c:26 [inline] tomoyo_init_log+0x11ce/0x2050 security/tomoyo/audit.c:264 tomoyo_supervisor+0x38a/0x11f0 security/tomoyo/common.c:2089 tomoyo_audit_env_log security/tomoyo/environ.c:36 [inline] tomoyo_env_perm+0x178/0x210 security/tomoyo/environ.c:63 tomoyo_environ security/tomoyo/domain.c:672 [inline] tomoyo_find_next_domain+0x1384/0x1cf0 security/tomoyo/domain.c:878 tomoyo_bprm_check_security+0x115/0x180 security/tomoyo/tomoyo.c:102 security_bprm_check+0x65/0x90 security/security.c:1191 search_binary_handler fs/exec.c:1785 [inline] exec_binprm fs/exec.c:1839 [inline] bprm_execve+0xa56/0x17c0 fs/exec.c:1891 do_execveat_common+0x553/0x700 fs/exec.c:1998 page last free pid 4897 tgid 4897 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1088 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2601 discard_slab mm/slub.c:2526 [inline] __put_partials+0xeb/0x130 mm/slub.c:2994 put_cpu_partial+0x17c/0x250 mm/slub.c:3069 __slab_free+0x2ea/0x3d0 mm/slub.c:4306 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3940 [inline] slab_alloc_node mm/slub.c:4000 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4007 vm_area_alloc+0x24/0x1d0 kernel/fork.c:467 __install_special_mapping+0x2f/0x350 mm/mmap.c:3641 map_vdso+0x164/0x3a0 arch/x86/entry/vdso/vma.c:245 load_elf_binary+0x1ba4/0x2620 fs/binfmt_elf.c:1237 search_binary_handler fs/exec.c:1797 [inline] exec_binprm fs/exec.c:1839 [inline] bprm_execve+0xaf8/0x17c0 fs/exec.c:1891 do_execveat_common+0x553/0x700 fs/exec.c:1998 do_execve fs/exec.c:2072 [inline] __do_sys_execve fs/exec.c:2148 [inline] __se_sys_execve fs/exec.c:2143 [inline] __x64_sys_execve+0x92/0xb0 fs/exec.c:2143 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 Memory state around the buggy address: ffff88807cde1f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807cde1f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807cde2000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88807cde2080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807cde2100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================