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charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:HwANtY5pHX9qYll2jJJf4uOJIN+l61iXICErTSTzPZFd3Vw2k/u N1hnYThu6D0Km2BQUPRL5mUUfHMNfwVEgAbF1CZIeHZFIg8ncO4e3JTKGyHcwTroK23ibQA rE7IhaMGYIUrgTnljq/YB/bdaXefSM3CvV7JPwYb7uvdWmPSRsVYQ+qaoReJ5m5G5RW9Ghf /s2NNjCj0JSmKT7LjGvuQ== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:jG/myljbTF4=;XPgAA4qo5ZIYpJtOlwbLSQBsokR 6qH4ow+QPVJ+ryv/KBeGIP0ttNGiSC8lizgwQxwCRRct7do+0/oiRTFX+1onIOtT8z4QBIl07 UgzY9stE243qLk2UXNHvnNX2CLA8N+rztXofZoekxibMOZyfxrsx8wQ/uSohxV2Jg7+zRocA1 35flv2MaiKB9dBe4VS7Fscg0S9I3rEjfcikxNJ6orik0v+AjNmf8i1yT48ljDCb3pjL9usdES 56B4Cx7Az16c4AjkxdW14F/fTKX9SQAWCogHGks9/F3tbNVlZ8eic1oEvzMXsHtBylmjkYGpB IQ7mk7/2n9dg/IrxExBMT6bBWcW6bxDW+lePowFjUO3RwxbVOWoQrIj8S53IKoemvuaI/baBn GTdVBp36Ut6+K/X9KXiw3a5lfrnzBG9a1pOFh0Muy/apVFZjdqx5RVDubXDH8k1K2W5HgUmmt PY6lEN+9nJ77iD2Myi7uPM98nzpTgYOmsFYTXLGT6faFnh/h6sgzYY+kmppE+kKEqk+tESiXM YyG48Hq7Gx8WfKiZVQ6j8MD61U2qdOwiU9ELeIX/ipatw9+NzlGhYxcn7KGmZdv+KpfWW1qCW hmqTQnaxuWOKyfsz8CbAWryRK0R4TAfCqe/0XAeU6VsrElkEf3g2aO8hI3zoC0YoDJDbGdqmU j4Xttq98kVKPZYNYkXa9m/LT+QPumgaebWxv/qe1NBQSbE6BcwrSJO/j1dfZ1f6oEj4K990tN Z/AjgoygKtKeeEFX/jWv2miNB/2yGa08gF7EUjKJbqTFpqZIZc0CEUtAfCoBahUjuvxJunEtc 08RK2hk3ZyTqpITWf8ciiSZaCO6iCoaQuX4pP4n45UAic= On 4/18/24 16:26, Takashi Iwai wrote: > On Thu, 18 Apr 2024 16:06:52 +0200, > Nam Cao wrote: >> >> On 2024-04-18 Harshit Mogalapalli wrote: >>> While fuzzing 5.15.y kernel with Syzkaller, we noticed a INFO: task hu= ng >>> bug in fb_deferred_io_work() >> >> Which framebuffer device are you using exactly? It is possible that >> the problem is with the device driver, not core framebuffer. > > Note that it was already known that using flush_delayed_work() caused > a problem. See the thread of the fix patch: > https://lore.kernel.org/all/20230129082856.22113-1-tiwai@suse.de/ Harshit reported the hung tasks with kernel v5.15-stable, and can even rep= roduce that issue with kernel v6.9-rc4 although it has all of your patches from that referenced mail thread applied. So, what does your statement that "it was already known that it causes pro= blems" exactly mean? Can it be fixed? Is someone looking into fixing it? > BTW, the problem is seen with bochs drm. Helge