loop0: detected capacity change from 0 to 32768 bcachefs (loop0): mounting version 1.7: (unknown version) opts=metadata_checksum=none,data_checksum=xxhash,str_hash=crc32c,nojournal_transaction_names,reconstruct_alloc,version_upgrade=none bcachefs (loop0): recovering from clean shutdown, journal seq 8 bcachefs (loop0): Version downgrade required: ================================================================== BUG: KASAN: slab-use-after-free in bch2_fs_recovery+0xab5/0x4d80 fs/bcachefs/recovery.c:775 Read of size 8 at addr ffff888172f38f50 by task syz.0.15/3311 CPU: 1 PID: 3311 Comm: syz.0.15 Not tainted 6.7.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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_fs_recovery+0xab5/0x4d80 fs/bcachefs/recovery.c:775 bch2_fs_start+0x5f1/0x7c0 fs/bcachefs/super.c:978 bch2_fs_open+0x1f18/0x2b10 fs/bcachefs/super.c:1968 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: 0033:0x7f0109d7f79a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f010ac4ce68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f010ac4cef0 RCX: 00007f0109d7f79a RDX: 0000000020005b00 RSI: 0000000020005b40 RDI: 00007f010ac4ceb0 RBP: 0000000020005b00 R08: 00007f010ac4cef0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020005b40 R13: 00007f010ac4ceb0 R14: 0000000000005b2d R15: 00000000200003c0 Allocated by task 3311: 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 __copy_super+0x4fc/0xd20 fs/bcachefs/super-io.c:591 bch2_sb_to_fs+0x66/0xc0 fs/bcachefs/super-io.c:618 bch2_fs_alloc fs/bcachefs/super.c:778 [inline] bch2_fs_open+0x12bd/0x2b10 fs/bcachefs/super.c:1947 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 Freed by task 3311: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522 ____kasan_slab_free+0x122/0x1f0 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook mm/slub.c:1826 [inline] slab_free mm/slub.c:3809 [inline] __kmem_cache_free+0x2bc/0x470 mm/slub.c:3822 krealloc+0xcf/0x120 bch2_sb_realloc+0x1bd/0x370 fs/bcachefs/super-io.c:207 bch2_sb_field_resize_id+0x17e/0xbc0 fs/bcachefs/super-io.c:239 bch2_sb_counters_from_cpu+0x89/0x240 fs/bcachefs/counters.c:75 bch2_write_super+0x824/0x2bf0 fs/bcachefs/super-io.c:939 bch2_fs_recovery+0xaa1/0x4d80 fs/bcachefs/recovery.c:773 bch2_fs_start+0x5f1/0x7c0 fs/bcachefs/super.c:978 bch2_fs_open+0x1f18/0x2b10 fs/bcachefs/super.c:1968 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 ffff888172f38000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 3920 bytes inside of freed 4096-byte region [ffff888172f38000, ffff888172f39000) The buggy address belongs to the physical page: page:ffffea0005cbce00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x172f38 head:ffffea0005cbce00 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 ffff888100042140 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000040004 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 0x1d2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 2455, tgid 2455 (kworker/u4:3), ts 60092508914, free_ts 60077080637 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_environ security/tomoyo/domain.c:633 [inline] tomoyo_find_next_domain+0xd20/0x1700 security/tomoyo/domain.c:878 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 kernel_execve+0x543/0x620 fs/exec.c:2022 call_usermodehelper_exec_async+0x203/0x310 kernel/umh.c:110 ret_from_fork+0x32/0x60 arch/x86/kernel/process.c:147 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+0x7f8/0x910 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 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc+0x99/0x1d0 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] load_elf_phdrs fs/binfmt_elf.c:526 [inline] load_elf_binary+0x22b/0x2150 fs/binfmt_elf.c:855 search_binary_handler fs/exec.c:1737 [inline] exec_binprm fs/exec.c:1779 [inline] bprm_execve+0x93b/0x13b0 fs/exec.c:1854 kernel_execve+0x543/0x620 fs/exec.c:2022 call_usermodehelper_exec_async+0x203/0x310 kernel/umh.c:110 ret_from_fork+0x32/0x60 arch/x86/kernel/process.c:147 Memory state around the buggy address: ffff888172f38e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888172f38e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888172f38f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888172f38f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888172f39000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================