syz.0.0: attempt to access beyond end of device loop0: rw=1, 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:4755! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5360 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:4755 Code: e8 04 ba aa ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 20 be 45 ff 90 0f 0b e8 18 be 45 ff 90 0f 0b e8 10 be 45 ff 90 <0f> 0b e8 08 be 45 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc9000d356868 EFLAGS: 00010293 RAX: ffffffff8279ff30 RBX: 00000000ffffffdc RCX: ffff888000214880 RDX: 0000000000000000 RSI: 000000000000002c RDI: 0000000000000008 RBP: 1ffff1100881d07b R08: ffff8880440e9503 R09: 1ffff1100881d2a0 R10: dffffc0000000000 R11: ffffed100881d2a1 R12: 0000000000000000 R13: 000000000000002c R14: 1ffff1100881d2a3 R15: ffff8880440e9518 FS: 0000000000000000(0000) GS:ffff88808d007000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fceab582000 CR3: 00000000516ae000 CR4: 0000000000352ef0 Call Trace: ext4_mb_use_preallocated+0x660/0x13f0 fs/ext4/mballoc.c:4972 ext4_mb_new_blocks+0x5b4/0x4720 fs/ext4/mballoc.c:6276 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:2634 __writeback_single_inode+0x145/0xff0 fs/fs-writeback.c:1680 writeback_single_inode+0x1f3/0x6a0 fs/fs-writeback.c:1801 write_inode_now+0x160/0x1d0 fs/fs-writeback.c:2864 iput_final fs/inode.c:1884 [inline] iput+0x5b9/0x9d0 fs/inode.c:1923 __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+0x1d1/0x260 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x6b5/0x2300 kernel/exit.c:961 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102 get_signal+0x1286/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:40 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/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdf7158ec29 Code: Unable to access opcode bytes at 0x7fdf7158ebff. RSP: 002b:00007fdf72383038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: 000000000000e000 RBX: 00007fdf717d6090 RCX: 00007fdf7158ec29 RDX: 000000000001040c RSI: 0000200000000380 RDI: 0000000000000005 RBP: 00007fdf71611e41 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fdf717d6128 R14: 00007fdf717d6090 R15: 00007ffc3ef39458 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4755 Code: e8 04 ba aa ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 20 be 45 ff 90 0f 0b e8 18 be 45 ff 90 0f 0b e8 10 be 45 ff 90 <0f> 0b e8 08 be 45 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc9000d356868 EFLAGS: 00010293 RAX: ffffffff8279ff30 RBX: 00000000ffffffdc RCX: ffff888000214880 RDX: 0000000000000000 RSI: 000000000000002c RDI: 0000000000000008 RBP: 1ffff1100881d07b R08: ffff8880440e9503 R09: 1ffff1100881d2a0 R10: dffffc0000000000 R11: ffffed100881d2a1 R12: 0000000000000000 R13: 000000000000002c R14: 1ffff1100881d2a3 R15: ffff8880440e9518 FS: 0000000000000000(0000) GS:ffff88808d007000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fceab582000 CR3: 00000000516ae000 CR4: 0000000000352ef0