EXT4-fs error (device loop0) in ext4_reserve_inode_write:6305: Out of memory EXT4-fs error (device loop0): ext4_dirty_inode:6509: inode #18: comm syz.0.0: mark_inode_dirty error EXT4-fs error (device loop0) in ext4_reserve_inode_write:6305: Out of memory EXT4-fs error (device loop0): ext4_dirty_inode:6509: inode #18: comm syz.0.0: mark_inode_dirty error EXT4-fs error (device loop0) in ext4_reserve_inode_write:6305: Out of memory EXT4-fs error (device loop0): ext4_dirty_inode:6509: 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:4765! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5327 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:4765 Code: e8 64 ee a9 ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 a0 b4 42 ff 90 0f 0b e8 98 b4 42 ff 90 0f 0b e8 90 b4 42 ff 90 <0f> 0b e8 88 b4 42 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc9000d416c28 EFLAGS: 00010293 RAX: ffffffff827d9f00 RBX: 00000000fffffffc RCX: ffff88801c49a480 RDX: 0000000000000000 RSI: 0000000000000034 RDI: 0000000000000030 RBP: 1ffff110085eea07 R08: ffff888042f76333 R09: 1ffff110085eec66 R10: dffffc0000000000 R11: ffffed10085eec67 R12: 0000000000000000 R13: 0000000000000034 R14: 1ffff110085eec69 R15: ffff888042f76348 FS: 00007f623cdd46c0(0000) GS:ffff88808d301000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6241715698 CR3: 0000000011154000 CR4: 0000000000352ef0 Call Trace: ext4_mb_use_preallocated+0x660/0x13f0 fs/ext4/mballoc.c:4982 ext4_mb_new_blocks+0x5b4/0x4720 fs/ext4/mballoc.c:6286 ext4_alloc_branch fs/ext4/indirect.c:340 [inline] ext4_ind_map_blocks+0xe42/0x21c0 fs/ext4/indirect.c:635 ext4_map_create_blocks fs/ext4/inode.c:611 [inline] ext4_map_blocks+0x7fe/0x1740 fs/ext4/inode.c:811 mpage_map_one_extent fs/ext4/inode.c:2374 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2468 [inline] ext4_do_writepages+0x16a1/0x4610 fs/ext4/inode.c:2931 ext4_writepages+0x205/0x350 fs/ext4/inode.c:3025 do_writepages+0x32e/0x550 mm/page-writeback.c:2604 __writeback_single_inode+0x145/0xff0 fs/fs-writeback.c:1719 writeback_single_inode+0x1f9/0x6a0 fs/fs-writeback.c:1840 write_inode_now+0x160/0x1d0 fs/fs-writeback.c:2903 iput_final fs/inode.c:1901 [inline] iput+0x830/0xc50 fs/inode.c:1966 __dentry_kill+0x209/0x660 fs/dcache.c:669 dput+0x19f/0x2b0 fs/dcache.c:911 __fput+0x68e/0xa70 fs/file_table.c:476 task_work_run+0x1d4/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xe9/0x130 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f624098eec9 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:00007f623cdd4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: 000000000001040c RBX: 00007f6240be6090 RCX: 00007f624098eec9 RDX: 000000000001040c RSI: 0000200000000380 RDI: 0000000000000004 RBP: 00007f6240a11f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6240be6128 R14: 00007f6240be6090 R15: 00007fffe542dc68 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4765 Code: e8 64 ee a9 ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 a0 b4 42 ff 90 0f 0b e8 98 b4 42 ff 90 0f 0b e8 90 b4 42 ff 90 <0f> 0b e8 88 b4 42 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc9000d416c28 EFLAGS: 00010293 RAX: ffffffff827d9f00 RBX: 00000000fffffffc RCX: ffff88801c49a480 RDX: 0000000000000000 RSI: 0000000000000034 RDI: 0000000000000030 RBP: 1ffff110085eea07 R08: ffff888042f76333 R09: 1ffff110085eec66 R10: dffffc0000000000 R11: ffffed10085eec67 R12: 0000000000000000 R13: 0000000000000034 R14: 1ffff110085eec69 R15: ffff888042f76348 FS: 00007f623cdd46c0(0000) GS:ffff88808d301000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6241715698 CR3: 0000000011154000 CR4: 0000000000352ef0