Hello! On Fri 20-12-24 00:24:50, Zhiyu Zhang wrote: > We would like to report a Linux kernel bug titled "INFO: task hung in > inode_sleep_on_writeback" on Linux-6.13-rc3 through our syzkaller. > > We noticed that there was also a report in Linux-5.15 with the same title > in November 2021 ( > https://syzkaller.appspot.com/bug?id=db653376de6a338b4a3c492b95634d6cabbdd68d), > but it did not have any reproductors. We found the lacking Syz and C > reproducers and can reproduce the issue in kernel 6.13-rc3 (see the > reproduction log). But I am not sure if they share the same root cause. > Here are the relevant attachments: > > kernel config: > https://drive.google.com/file/d/1d_Wuer-ZN1HELwDCoUHbWdlf8cIdRWOn/view?usp=sharing > manual reproduction log: > https://drive.google.com/file/d/1ZBshikZqJ78LHl7C3d4UOzPJE1konn9m/view?usp=sharing > repro report: > https://drive.google.com/file/d/1Nacupxxgcm6g3LZ95yADh7T9i20OFmM6/view?usp=sharing > repro log: > https://drive.google.com/file/d/1FlZPy9AJ9bu7MTEANszRV6IPo7dTe63G/view?usp=sharing > syz reproducer: > https://drive.google.com/file/d/1JA2KRWpLHglRGt2bgruYSgRrcDDE4fD3/view?usp=sharing > C reproducer: > https://drive.google.com/file/d/16AyJ0A-xXq32vXDbz714rmHuel9jvxyF/view?usp=sharing Well, the reproducers are hardly relevant for this. The syz reproducer is: r0 = socket$unix(0x1, 0x5, 0x0) ioctl$sock_SIOCETHTOOL(r0, 0x89f0, ...) and that's all... Definitely not a VFS bug, perhaps ask networking people whether fuzzing SIOCETHTOOL ioctl makes sense. Honza -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR