EXT4-fs (loop5): mounted filesystem without journal. Opts: delalloc,data_err=abort,barrier=0x0000000000000002,sysvgroups,nojournal_checksum,lazytime,jqfmt=vfsv0,grpquota,nobh,jqfmt=vfsold,bh,usrquota,,errors=continue ================================================================== BUG: KASAN: use-after-free in ext4_ext_binsearch fs/ext4/extents.c:826 [inline] BUG: KASAN: use-after-free in ext4_find_extent+0xbeb/0xe20 fs/ext4/extents.c:945 Read of size 4 at addr ffff888144e5a018 by task syz.5.2554/8463 CPU: 1 PID: 8463 Comm: syz.5.2554 Not tainted 5.10.240-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 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 ext4_ext_binsearch fs/ext4/extents.c:826 [inline] ext4_find_extent+0xbeb/0xe20 fs/ext4/extents.c:945 ext4_ext_map_blocks+0x1de/0x5d40 fs/ext4/extents.c:4160 ext4_map_blocks+0x978/0x1bc0 fs/ext4/inode.c:674 _ext4_get_block+0x1bb/0x4b0 fs/ext4/inode.c:817 ext4_get_block+0x39/0x50 fs/ext4/inode.c:834 ext4_block_write_begin+0x567/0x1330 fs/ext4/inode.c:1101 ext4_write_begin+0x651/0x1550 fs/ext4/ext4_jbd2.h:-1 ext4_da_write_begin+0x455/0xe80 fs/ext4/inode.c:3033 generic_perform_write+0x2be/0x510 mm/filemap.c:3509 ext4_buffered_write_iter+0x4b8/0x640 fs/ext4/file.c:271 ext4_file_write_iter+0x536/0x1980 fs/ext4/file.c:-1 do_iter_readv_writev+0x491/0x600 fs/read_write.c:-1 do_iter_write+0x189/0x630 fs/read_write.c:866 vfs_writev+0x293/0x4f0 fs/read_write.c:939 do_pwritev fs/read_write.c:1036 [inline] __do_sys_pwritev2 fs/read_write.c:1095 [inline] __se_sys_pwritev2+0x1a9/0x2b0 fs/read_write.c:1086 __x64_sys_pwritev2+0xbf/0xd0 fs/read_write.c:1086 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fe306e06be9 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:00007fe30586f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007fe30702dfa0 RCX: 00007fe306e06be9 RDX: 0000000000000001 RSI: 0000200000000100 RDI: 0000000000000007 RBP: 00007fe306e89e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000005412 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe30702e038 R14: 00007fe30702dfa0 R15: 00007ffc460b10d8 The buggy address belongs to the page: page:ffffea0005139680 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x144e5a flags: 0x4000000000000000() raw: 4000000000000000 ffffea00051396c8 ffffea0005139648 0000000000000000 raw: 0000000000000001 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 0x100cca(GFP_HIGHUSER_MOVABLE), pid 8426, ts 381041594543, free_ts 381870898945 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:5357 __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] shmem_alloc_page+0x1b1/0x300 mm/shmem.c:1584 shmem_alloc_and_acct_page+0x36f/0x7b0 mm/shmem.c:1609 shmem_getpage_gfp+0x625/0x2110 mm/shmem.c:1922 shmem_fault+0x2b7/0x640 mm/shmem.c:2143 __do_fault mm/memory.c:4064 [inline] do_read_fault mm/memory.c:4399 [inline] do_fault mm/memory.c:4527 [inline] handle_pte_fault+0x1fa5/0x3750 mm/memory.c:4791 __handle_mm_fault mm/memory.c:4944 [inline] handle_mm_fault+0xf3f/0x16a0 mm/memory.c:5358 faultin_page mm/gup.c:902 [inline] __get_user_pages+0xbe9/0x13e0 mm/gup.c:1121 populate_vma_page_range mm/gup.c:1454 [inline] __mm_populate+0x33b/0x420 mm/gup.c:1502 mm_populate include/linux/mm.h:2782 [inline] vm_mmap_pgoff+0x223/0x340 mm/util.c:548 ksys_mmap_pgoff+0xfd/0x1e0 mm/mmap.c:1708 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:95 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __x64_sys_mmap+0xfa/0x110 arch/x86/kernel/sys_x86_64.c:86 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 __pagevec_release+0x71/0xe0 mm/swap.c:1123 pagevec_release include/linux/pagevec.h:88 [inline] shmem_undo_range+0x6e1/0x1760 mm/shmem.c:969 shmem_truncate_range mm/shmem.c:1073 [inline] shmem_evict_inode+0x1fd/0x9c0 mm/shmem.c:1173 evict+0x478/0x910 fs/inode.c:612 iput_final fs/inode.c:1736 [inline] iput+0x638/0x7c0 fs/inode.c:1762 dentry_unlink_inode+0x2cf/0x380 fs/dcache.c:378 __dentry_kill+0x44f/0x650 fs/dcache.c:583 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1 dput+0x42/0x80 fs/dcache.c:883 __fput+0x4fe/0x770 fs/file_table.c:294 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x127/0x190 kernel/task_work.c:189 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xa4f/0x2480 kernel/exit.c:872 Memory state around the buggy address: ffff888144e59f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888144e59f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888144e5a000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888144e5a080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888144e5a100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================