EXT4-fs (loop2): mounted filesystem without journal. Opts: discard,nodiscard,noquota,noinit_itable,stripe=0x0000000000000079,resgid=0x0000000000000000,sysvgroups,delalloc,delalloc,,errors=continue ext4 filesystem being mounted at /0/file1 supports timestamps until 2038-01-19 (0x7fffffff) ================================================================== 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 ffff88812c602ccc by task syz.2.16/478 CPU: 0 PID: 478 Comm: syz.2.16 Not tainted 5.10.237-syzkaller-1007464-g7e2543346ff7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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_remove_space+0x306/0x4910 fs/ext4/extents.c:2826 ext4_punch_hole+0x6f8/0xad0 fs/ext4/inode.c:4217 ext4_fallocate+0x271/0x1a70 fs/ext4/extents.c:4756 vfs_fallocate+0x4b4/0x590 fs/open.c:310 ksys_fallocate fs/open.c:333 [inline] __do_sys_fallocate fs/open.c:341 [inline] __se_sys_fallocate fs/open.c:339 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:339 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fa6cbbc3de9 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:00007fa6cb636038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fa6cbddcfa0 RCX: 00007fa6cbbc3de9 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: 00007fa6cbc452a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001a00 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fa6cbddcfa0 R15: 00007ffc4dd20248 The buggy address belongs to the page: page:ffffea0004b18080 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x12c602 flags: 0x4000000000000000() raw: 4000000000000000 ffffea0004b180c8 ffffea0004b18048 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 0x8100dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|0x8000000), pid 418, ts 54516613677, free_ts 54517422774 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:5349 __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] do_anonymous_page mm/memory.c:3963 [inline] handle_pte_fault+0x1719/0x3750 mm/memory.c:4786 __handle_mm_fault mm/memory.c:4944 [inline] handle_mm_fault+0xf3f/0x16a0 mm/memory.c:5358 do_user_addr_fault+0x5a2/0xc80 arch/x86/mm/fault.c:1362 handle_page_fault arch/x86/mm/fault.c:1428 [inline] exc_page_fault+0x5a/0xc0 arch/x86/mm/fault.c:1484 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571 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 unmap_region+0x32c/0x380 mm/mmap.c:2799 __do_munmap+0x63c/0x850 mm/mmap.c:3029 __vm_munmap mm/mmap.c:3082 [inline] __do_sys_munmap mm/mmap.c:3108 [inline] __se_sys_munmap+0x127/0x1b0 mm/mmap.c:3104 __x64_sys_munmap+0x5b/0x70 mm/mmap.c:3104 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff88812c602b80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88812c602c00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88812c602c80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88812c602d00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88812c602d80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== ------------[ cut here ]------------ kernel BUG at fs/ext4/extents.c:3180! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 478 Comm: syz.2.16 Tainted: G B 5.10.237-syzkaller-1007464-g7e2543346ff7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:ext4_split_extent_at+0xe6e/0xe90 fs/ext4/extents.c:3180 Code: 48 89 df 48 89 74 24 68 e8 ef 8b d3 ff 48 8b 74 24 68 e9 5a fb ff ff e8 60 9c 99 ff 0f 0b e8 59 9c 99 ff 0f 0b e8 52 9c 99 ff <0f> 0b e8 4b 9c 99 ff 0f 0b e8 44 9c 99 ff 0f 0b e8 3d 9c 99 ff 0f RSP: 0018:ffffc90002f87900 EFLAGS: 00010293 RAX: ffffffff81c9f6ae RBX: 0000000000000000 RCX: ffff888129e9bb40 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffffc90002f87a70 R08: 0000000000000000 R09: 0000000050000028 R10: fffffbfff0d8e248 R11: 1ffffffff0d8e248 R12: 0000000000000000 R13: 0000000000000000 R14: 1ffff110258c0d30 R15: 0000000000000000 FS: 00007fa6cb6366c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005597fe983410 CR3: 0000000116846000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ext4_force_split_extent_at fs/ext4/extents.c:318 [inline] ext4_ext_remove_space+0x677/0x4910 fs/ext4/extents.c:2873 ext4_punch_hole+0x6f8/0xad0 fs/ext4/inode.c:4217 ext4_fallocate+0x271/0x1a70 fs/ext4/extents.c:4756 vfs_fallocate+0x4b4/0x590 fs/open.c:310 ksys_fallocate fs/open.c:333 [inline] __do_sys_fallocate fs/open.c:341 [inline] __se_sys_fallocate fs/open.c:339 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:339 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fa6cbbc3de9 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:00007fa6cb636038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fa6cbddcfa0 RCX: 00007fa6cbbc3de9 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000005 RBP: 00007fa6cbc452a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001a00 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fa6cbddcfa0 R15: 00007ffc4dd20248 Modules linked in: ---[ end trace 6829ca62e27cf694 ]--- RIP: 0010:ext4_split_extent_at+0xe6e/0xe90 fs/ext4/extents.c:3180 Code: 48 89 df 48 89 74 24 68 e8 ef 8b d3 ff 48 8b 74 24 68 e9 5a fb ff ff e8 60 9c 99 ff 0f 0b e8 59 9c 99 ff 0f 0b e8 52 9c 99 ff <0f> 0b e8 4b 9c 99 ff 0f 0b e8 44 9c 99 ff 0f 0b e8 3d 9c 99 ff 0f RSP: 0018:ffffc90002f87900 EFLAGS: 00010293 RAX: ffffffff81c9f6ae RBX: 0000000000000000 RCX: ffff888129e9bb40 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffffc90002f87a70 R08: 0000000000000000 R09: 0000000050000028 R10: fffffbfff0d8e248 R11: 1ffffffff0d8e248 R12: 0000000000000000 R13: 0000000000000000 R14: 1ffff110258c0d30 R15: 0000000000000000 FS: 00007fa6cb6366c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005597fe983410 CR3: 0000000116846000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400