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 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=104, nr_sectors = 24 limit=64 EXT4-fs warning (device loop0): ext4_end_bio:372: I/O error 10 writing to inode 18 starting block 52) Buffer I/O error on device loop0, logical block 52 Buffer I/O error on device loop0, logical block 53 Buffer I/O error on device loop0, logical block 54 Buffer I/O error on device loop0, logical block 55 Buffer I/O error on device loop0, logical block 56 Buffer I/O error on device loop0, logical block 57 Buffer I/O error on device loop0, logical block 58 Buffer I/O error on device loop0, logical block 59 Buffer I/O error on device loop0, logical block 60 Buffer I/O error on device loop0, logical block 61 ------------[ cut here ]------------ kernel BUG at fs/ext4/mballoc.c:4787! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5342 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 64 61 a8 ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 e0 b6 40 ff 90 0f 0b e8 d8 b6 40 ff 90 0f 0b e8 d0 b6 40 ff 90 <0f> 0b e8 c8 b6 40 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc9000b6fe848 EFLAGS: 00010293 RAX: ffffffff82805090 RBX: 00000000fffffffc RCX: ffff8880008ca4c0 RDX: 0000000000000000 RSI: 0000000000000044 RDI: 0000000000000040 RBP: 1ffff1100640eab5 R08: ffff8880320766d3 R09: 1ffff1100640ecda R10: dffffc0000000000 R11: ffffed100640ecdb R12: 0000000000000000 R13: 0000000000000044 R14: 1ffff1100640ecdd R15: ffff8880320766e8 FS: 0000000000000000(0000) GS:ffff88808d414000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055adcc32d168 CR3: 0000000043d0f000 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 task_work_run+0x1d4/0x260 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x694/0x22f0 kernel/exit.c:971 do_group_exit+0x21c/0x2d0 kernel/exit.c:1112 get_signal+0x1285/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline] exit_to_user_mode_loop+0x87/0x4e0 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x2c1/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f688258f7c9 Code: Unable to access opcode bytes at 0x7f688258f79f. RSP: 002b:00007f687e9d4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00007f68827e6090 RCX: 00007f688258f7c9 RDX: 0000200000000540 RSI: 0000000000004c04 RDI: 000000000000004d RBP: 00007f6882613f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f68827e6128 R14: 00007f68827e6090 R15: 00007ffd54134f78 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4787 Code: e8 64 61 a8 ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 e0 b6 40 ff 90 0f 0b e8 d8 b6 40 ff 90 0f 0b e8 d0 b6 40 ff 90 <0f> 0b e8 c8 b6 40 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc9000b6fe848 EFLAGS: 00010293 RAX: ffffffff82805090 RBX: 00000000fffffffc RCX: ffff8880008ca4c0 RDX: 0000000000000000 RSI: 0000000000000044 RDI: 0000000000000040 RBP: 1ffff1100640eab5 R08: ffff8880320766d3 R09: 1ffff1100640ecda R10: dffffc0000000000 R11: ffffed100640ecdb R12: 0000000000000000 R13: 0000000000000044 R14: 1ffff1100640ecdd R15: ffff8880320766e8 FS: 0000000000000000(0000) GS:ffff88808d414000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055adcc32d168 CR3: 0000000043d0f000 CR4: 0000000000352ef0