loop0: detected capacity change from 0 to 128 loop0: detected capacity change from 0 to 32768 ======================================================= WARNING: The mand mount option has been deprecated and and is ignored by this kernel. Remove the mand option from the mount to silence this warning. ======================================================= ocfs2: Mounting device (7,0) on (node local, slot 0) with writeback data mode. ================================================================== BUG: KASAN: use-after-free in ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1447 [inline] BUG: KASAN: use-after-free in ocfs2_claim_suballoc_bits+0x8b2/0x2450 fs/ocfs2/suballoc.c:1996 Read of size 4 at addr ffff888053d9d000 by task syz.0.0/5327 CPU: 0 UID: 0 PID: 5327 Comm: syz.0.0 Not tainted 6.16.0-rc1-syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xd2/0x2b0 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 ocfs2_find_victim_chain fs/ocfs2/suballoc.c:1447 [inline] ocfs2_claim_suballoc_bits+0x8b2/0x2450 fs/ocfs2/suballoc.c:1996 __ocfs2_claim_clusters+0x303/0x8f0 fs/ocfs2/suballoc.c:2421 ocfs2_add_clusters_in_btree+0x336/0xf80 fs/ocfs2/alloc.c:4834 ocfs2_add_inode_data+0xce/0x120 fs/ocfs2/file.c:550 ocfs2_write_cluster fs/ocfs2/aops.c:1114 [inline] ocfs2_write_cluster_by_desc+0x547/0x1cf0 fs/ocfs2/aops.c:1218 ocfs2_write_begin_nolock+0x31a3/0x4340 fs/ocfs2/aops.c:1795 ocfs2_dio_wr_get_block+0xb6f/0x1770 fs/ocfs2/aops.c:2211 get_more_blocks fs/direct-io.c:648 [inline] do_direct_IO fs/direct-io.c:936 [inline] __blockdev_direct_IO+0x16da/0x33d0 fs/direct-io.c:1243 ocfs2_direct_IO+0x25f/0x2d0 fs/ocfs2/aops.c:2438 generic_file_direct_write+0x1db/0x3e0 mm/filemap.c:4046 __generic_file_write_iter+0x11d/0x230 mm/filemap.c:4215 ocfs2_file_write_iter+0x157a/0x1d10 fs/ocfs2/file.c:2469 aio_write+0x535/0x7a0 fs/aio.c:1634 __io_submit_one fs/aio.c:-1 [inline] io_submit_one+0x78b/0x1310 fs/aio.c:2053 __do_sys_io_submit fs/aio.c:2112 [inline] __se_sys_io_submit+0x185/0x2f0 fs/aio.c:2082 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f371e78e929 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f371f5b7038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1 RAX: ffffffffffffffda RBX: 00007f371e9b5fa0 RCX: 00007f371e78e929 RDX: 0000200000000540 RSI: 000000000000003b RDI: 00007f371f56d000 RBP: 00007f371e810b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f371e9b5fa0 R15: 00007ffd24c23c98 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f7e18fec pfn:0x53d9d flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) raw: 04fff00000000000 ffffea00014f6548 ffffea00014f6788 0000000000000000 raw: 00000007f7e18fec 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|__GFP_COMP), pid 5302, tgid 5302 (udevd), ts 89730393972, free_ts 89777486933 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419 folio_alloc_mpol_noprof mm/mempolicy.c:2438 [inline] vma_alloc_folio_noprof+0xe4/0x200 mm/mempolicy.c:2473 folio_prealloc+0x30/0x180 mm/memory.c:-1 alloc_anon_folio mm/memory.c:5034 [inline] do_anonymous_page mm/memory.c:5091 [inline] do_pte_missing mm/memory.c:4249 [inline] handle_pte_fault mm/memory.c:6089 [inline] __handle_mm_fault+0x2c88/0x5620 mm/memory.c:6232 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6401 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 page last free pid 5302 tgid 5302 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] free_unref_folios+0xc66/0x14d0 mm/page_alloc.c:2763 folios_put_refs+0x559/0x640 mm/swap.c:992 free_pages_and_swap_cache+0x4be/0x520 mm/swap_state.c:267 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:397 [inline] tlb_flush_mmu+0x3a0/0x680 mm/mmu_gather.c:404 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:497 vms_clear_ptes+0x42c/0x540 mm/vma.c:1244 vms_complete_munmap_vmas+0x206/0x8a0 mm/vma.c:1286 do_vmi_align_munmap+0x358/0x420 mm/vma.c:1545 do_vmi_munmap+0x253/0x2e0 mm/vma.c:1593 __vm_munmap+0x23b/0x3d0 mm/vma.c:3122 __do_sys_munmap mm/mmap.c:1084 [inline] __se_sys_munmap mm/mmap.c:1081 [inline] __x64_sys_munmap+0x60/0x70 mm/mmap.c:1081 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888053d9cf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888053d9cf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888053d9d000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888053d9d080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888053d9d100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================