================================================================== BUG: KASAN: use-after-free in f2fs_truncate_data_blocks_range+0x829/0xec0 fs/f2fs/file.c:599 Read of size 4 at addr ffff88811d2b9008 by task syz.3.1356/5493 CPU: 0 PID: 5493 Comm: syz.3.1356 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x169/0x1d8 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 f2fs_truncate_data_blocks_range+0x829/0xec0 fs/f2fs/file.c:599 f2fs_truncate_data_blocks+0xf7/0x140 fs/f2fs/file.c:656 truncate_dnode fs/f2fs/node.c:953 [inline] f2fs_truncate_inode_blocks+0x63b/0xfb0 fs/f2fs/node.c:1172 f2fs_do_truncate_blocks+0x6bc/0x9a0 fs/f2fs/file.c:745 f2fs_truncate_blocks+0x115/0x310 fs/f2fs/file.c:773 f2fs_truncate+0x1d7/0x3d0 fs/f2fs/file.c:825 f2fs_evict_inode+0x699/0x14b0 fs/f2fs/inode.c:807 evict+0x478/0x910 fs/inode.c:612 iput_final fs/inode.c:1736 [inline] iput+0x638/0x7c0 fs/inode.c:1762 f2fs_fill_super+0x5310/0x6c70 fs/f2fs/super.c:4364 mount_bdev+0x28b/0x3a0 fs/super.c:1442 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4595 legacy_get_tree+0xed/0x190 fs/fs_context.c:593 vfs_get_tree+0x89/0x260 fs/super.c:1572 do_new_mount+0x25a/0xa20 fs/namespace.c:2997 path_mount+0x572/0xc80 fs/namespace.c:3327 do_mount fs/namespace.c:3340 [inline] __do_sys_mount fs/namespace.c:3548 [inline] __se_sys_mount+0x318/0x380 fs/namespace.c:3525 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3525 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fa391a1476a 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:00007fa39047ae68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fa39047aef0 RCX: 00007fa391a1476a RDX: 0000200000000000 RSI: 0000200000000080 RDI: 00007fa39047aeb0 RBP: 0000200000000000 R08: 00007fa39047aef0 R09: 000000000000001f R10: 000000000000001f R11: 0000000000000246 R12: 0000200000000080 R13: 00007fa39047aeb0 R14: 0000000000005531 R15: 00002000000004c0 The buggy address belongs to the page: page:ffffea000474ae40 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11d2b9 flags: 0x4000000000000000() raw: 4000000000000000 ffffea0004aef848 ffffea00045cb048 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Unmovable, gfp_mask 0x500dc0(GFP_USER|__GFP_ZERO|__GFP_ACCOUNT), pid 279, ts 334490198599, free_ts 334568635241 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2235/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5370 __alloc_pages include/linux/gfp.h:544 [inline] __alloc_pages_node include/linux/gfp.h:557 [inline] alloc_pages_node include/linux/gfp.h:571 [inline] alloc_pages include/linux/gfp.h:590 [inline] __pte_alloc_one include/asm-generic/pgalloc.h:63 [inline] pte_alloc_one+0x1f/0xc0 arch/x86/mm/pgtable.c:33 __pte_alloc+0x24/0x1d0 mm/memory.c:448 copy_pte_range mm/memory.c:977 [inline] copy_pmd_range mm/memory.c:1095 [inline] copy_pud_range mm/memory.c:1132 [inline] copy_p4d_range mm/memory.c:1156 [inline] copy_page_range+0x23ad/0x2870 mm/memory.c:1229 dup_mmap kernel/fork.c:620 [inline] dup_mm kernel/fork.c:1435 [inline] copy_mm+0xc65/0x1480 kernel/fork.c:1491 copy_process+0x1187/0x32c0 kernel/fork.c:2268 kernel_clone+0x23f/0x940 kernel/fork.c:2650 __do_sys_clone kernel/fork.c:2776 [inline] __se_sys_clone kernel/fork.c:2760 [inline] __x64_sys_clone+0x176/0x1d0 kernel/fork.c:2760 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] free_pcp_prepare mm/page_alloc.c:1421 [inline] free_unref_page_prepare+0x2b7/0x2d0 mm/page_alloc.c:3336 free_unref_page_list+0x12e/0x9b0 mm/page_alloc.c:3443 release_pages+0xe38/0xe80 mm/swap.c:1103 free_pages_and_swap_cache+0x86/0xa0 mm/swap_state.c:356 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:240 [inline] tlb_flush_mmu mm/mmu_gather.c:247 [inline] tlb_finish_mmu+0x175/0x300 mm/mmu_gather.c:326 exit_mmap+0x2fc/0x540 mm/mmap.c:3387 __mmput+0x93/0x2f0 kernel/fork.c:1153 mmput+0x4e/0x150 kernel/fork.c:1176 exit_mm kernel/exit.c:539 [inline] do_exit+0x9ae/0x2480 kernel/exit.c:859 do_group_exit+0x141/0x310 kernel/exit.c:986 get_signal+0xf7d/0x12e0 kernel/signal.c:2793 arch_do_signal_or_restart+0xbf/0x10f0 arch/x86/kernel/signal.c:805 handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop+0xa2/0xe0 kernel/entry/common.c:169 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199 syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56 Memory state around the buggy address: ffff88811d2b8f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811d2b8f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88811d2b9000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88811d2b9080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88811d2b9100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== F2FS-fs (loop3): access invalid blkaddr:550789127 CPU: 1 PID: 5493 Comm: syz.3.1356 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x169/0x1d8 lib/dump_stack.c:118 dump_stack+0x15/0x1c lib/dump_stack.c:135 f2fs_is_valid_blkaddr+0xc8c/0x1360 fs/f2fs/checkpoint.c:205 f2fs_truncate_data_blocks_range+0x67f/0xec0 fs/f2fs/file.c:617 f2fs_truncate_data_blocks+0xf7/0x140 fs/f2fs/file.c:656 truncate_dnode fs/f2fs/node.c:953 [inline] f2fs_truncate_inode_blocks+0x63b/0xfb0 fs/f2fs/node.c:1172 f2fs_do_truncate_blocks+0x6bc/0x9a0 fs/f2fs/file.c:745 f2fs_truncate_blocks+0x115/0x310 fs/f2fs/file.c:773 f2fs_truncate+0x1d7/0x3d0 fs/f2fs/file.c:825 f2fs_evict_inode+0x699/0x14b0 fs/f2fs/inode.c:807 evict+0x478/0x910 fs/inode.c:612 iput_final fs/inode.c:1736 [inline] iput+0x638/0x7c0 fs/inode.c:1762 f2fs_fill_super+0x5310/0x6c70 fs/f2fs/super.c:4364 mount_bdev+0x28b/0x3a0 fs/super.c:1442 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4595 legacy_get_tree+0xed/0x190 fs/fs_context.c:593 vfs_get_tree+0x89/0x260 fs/super.c:1572 do_new_mount+0x25a/0xa20 fs/namespace.c:2997 path_mount+0x572/0xc80 fs/namespace.c:3327 do_mount fs/namespace.c:3340 [inline] __do_sys_mount fs/namespace.c:3548 [inline] __se_sys_mount+0x318/0x380 fs/namespace.c:3525 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3525 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fa391a1476a 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:00007fa39047ae68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fa39047aef0 RCX: 00007fa391a1476a RDX: 0000200000000000 RSI: 0000200000000080 RDI: 00007fa39047aeb0 RBP: 0000200000000000 R08: 00007fa39047aef0 R09: 000000000000001f R10: 000000000000001f R11: 0000000000000246 R12: 0000200000000080 R13: 00007fa39047aeb0 R14: 0000000000005531 R15: 00002000000004c0 F2FS-fs (loop3): dec_valid_node_count: inconsistent i_blocks, ino:3, iblocks:0