loop0: detected capacity change from 0 to 512 EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /0/file1 supports timestamps until 2038-01-19 (0x7fffffff) loop0: detected capacity change from 512 to 64 EXT4-fs error (device loop0) in ext4_reserve_inode_write:6298: Out of memory EXT4-fs error (device loop0): ext4_splice_branch:479: inode #18: comm syz.0.0: mark_inode_dirty error EXT4-fs error (device loop0) in ext4_reserve_inode_write:6298: Out of memory EXT4-fs error (device loop0): ext4_dirty_inode:6502: inode #18: comm syz.0.0: mark_inode_dirty error EXT4-fs error (device loop0) in ext4_reserve_inode_write:6298: Out of memory EXT4-fs error (device loop0): ext4_dirty_inode:6502: inode #18: comm syz.0.0: mark_inode_dirty error EXT4-fs error (device loop0) in ext4_reserve_inode_write:6298: Out of memory EXT4-fs error (device loop0): ext4_dirty_inode:6502: inode #18: comm syz.0.0: mark_inode_dirty error syz.0.0: attempt to access beyond end of device loop0: rw=2049, sector=258, nr_sectors = 24 limit=64 EXT4-fs warning (device loop0): ext4_end_bio:372: I/O error 10 writing to inode 18 starting block 129) Buffer I/O error on device loop0, logical block 129 Buffer I/O error on device loop0, logical block 130 Buffer I/O error on device loop0, logical block 131 Buffer I/O error on device loop0, logical block 132 Buffer I/O error on device loop0, logical block 133 Buffer I/O error on device loop0, logical block 134 Buffer I/O error on device loop0, logical block 135 Buffer I/O error on device loop0, logical block 136 Buffer I/O error on device loop0, logical block 137 Buffer I/O error on device loop0, logical block 138 ------------[ cut here ]------------ kernel BUG at fs/ext4/mballoc.c:4787! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5332 Comm: syz.0.0 Not tainted 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 RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4787 Code: e8 c4 4b a8 ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 60 6f 40 ff 90 0f 0b e8 58 6f 40 ff 90 0f 0b e8 50 6f 40 ff 90 <0f> 0b e8 48 6f 40 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc9000c5bec28 EFLAGS: 00010283 RAX: ffffffff82815100 RBX: 00000000fffffff2 RCX: 0000000000100000 RDX: ffffc90021172000 RSI: 000000000000b15c RDI: 000000000000b15d RBP: 1ffff11008e95f0c R08: ffff8880474b0503 R09: 1ffff11008e960a0 R10: dffffc0000000000 R11: ffffed1008e960a1 R12: 0000000000000000 R13: 000000000000002e R14: 1ffff11008e960a3 R15: ffff8880474b0518 FS: 00007fd801ff86c0(0000) GS:ffff88808d22f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f915ab85d50 CR3: 0000000037e85000 CR4: 0000000000352ef0 Call Trace: ext4_mb_use_preallocated+0x660/0x13f0 fs/ext4/mballoc.c:5004 ext4_mb_new_blocks+0x5a1/0x46a0 fs/ext4/mballoc.c:6308 ext4_alloc_branch fs/ext4/indirect.c:340 [inline] ext4_ind_map_blocks+0xe22/0x2190 fs/ext4/indirect.c:635 ext4_map_create_blocks fs/ext4/inode.c:615 [inline] ext4_map_blocks+0x7d2/0x16f0 fs/ext4/inode.c:816 mpage_map_one_extent fs/ext4/inode.c:2380 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2474 [inline] ext4_do_writepages+0x18bb/0x4500 fs/ext4/inode.c:2932 ext4_writepages+0x203/0x350 fs/ext4/inode.c:3026 do_writepages+0x32e/0x550 mm/page-writeback.c:2598 __writeback_single_inode+0x133/0x1240 fs/fs-writeback.c:1737 writeback_single_inode+0x493/0xc70 fs/fs-writeback.c:1858 write_inode_now+0x160/0x1d0 fs/fs-writeback.c:2924 iput_final fs/inode.c:1941 [inline] iput+0xa77/0x1030 fs/inode.c:2003 __dentry_kill+0x209/0x660 fs/dcache.c:670 finish_dput+0xc9/0x480 fs/dcache.c:879 __fput+0x68e/0xa70 fs/file_table.c:476 fput_close_sync+0x113/0x220 fs/file_table.c:573 __do_sys_close fs/open.c:1573 [inline] __se_sys_close fs/open.c:1558 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1558 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd80118f7c9 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:00007fd801ff8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 00007fd8013e5fa0 RCX: 00007fd80118f7c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007fd801213f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd8013e6038 R14: 00007fd8013e5fa0 R15: 00007ffcab9bbc08 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4787 Code: e8 c4 4b a8 ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 60 6f 40 ff 90 0f 0b e8 58 6f 40 ff 90 0f 0b e8 50 6f 40 ff 90 <0f> 0b e8 48 6f 40 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc9000c5bec28 EFLAGS: 00010283 RAX: ffffffff82815100 RBX: 00000000fffffff2 RCX: 0000000000100000 RDX: ffffc90021172000 RSI: 000000000000b15c RDI: 000000000000b15d RBP: 1ffff11008e95f0c R08: ffff8880474b0503 R09: 1ffff11008e960a0 R10: dffffc0000000000 R11: ffffed1008e960a1 R12: 0000000000000000 R13: 000000000000002e R14: 1ffff11008e960a3 R15: ffff8880474b0518 FS: 00007fd801ff86c0(0000) GS:ffff88808d22f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f915ab85d50 CR3: 0000000037e85000 CR4: 0000000000352ef0