Hello, When fuzzing the Linux kernel driver v6.0-rc6, the following crash was triggered. HEAD commit: 521a547ced6477c54b4b0cc206000406c221b4d6 git tree: upstream kernel config: https://pastebin.com/raw/hekxU61F console output: https://pastebin.com/raw/r045maxd Sorry for failing to extract the reproducer. But on other versions of Linux, I also triggered this crash. I would appreciate it if you have any idea how to solve this bug. The crash report is as follows: ------------[ cut here ]------------ do not call blocking ops when !TASK_RUNNING; state=1 set at [<ffffffff815b0c88>] prepare_to_wait_event+0x68/0x680 kernel/sched/wait.c:329 WARNING: CPU: 0 PID: 20443 at kernel/sched/core.c:9815 __might_sleep+0x105/0x150 kernel/sched/core.c:9815 Modules linked in: CPU: 0 PID: 20443 Comm: syz-executor.2 Not tainted 6.0.0-rc6+ #3 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:__might_sleep+0x105/0x150 kernel/sched/core.c:9815 Code: 6f 02 00 48 8d bb c8 16 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 75 34 48 8b 93 c8 16 00 00 48 c7 c7 60 22 cc 89 e8 ce 04 d5 07 <0f> 0b e9 75 ff ff ff e8 3f 7d 76 00 e9 26 ff ff ff 89 34 24 e8 42 RSP: 0018:ffffc90003537ac8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff888041fcd7c0 RCX: 0000000000000000 RDX: ffffc9000f67a000 RSI: ffff888041fcd7c0 RDI: fffff520006a6f4b RBP: ffffffff89cc8840 R08: ffffffff816154d8 R09: 0000000000000000 R10: 0000000000000005 R11: ffffed1005984f2d R12: 000000000000003a R13: 0000000000000000 R14: 0000000000000000 R15: ffff888061936260 FS: 00007ff9a1382700(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbdcc616000 CR3: 0000000052e2c000 CR4: 0000000000350ef0 Call Trace: <TASK> down+0x19/0x90 kernel/locking/semaphore.c:58 dvb_frontend_test_event drivers/media/dvb-core/dvb_frontend.c:277 [inline] dvb_frontend_get_event.isra.0+0x523/0x670 drivers/media/dvb-core/dvb_frontend.c:301 dvb_frontend_handle_ioctl+0x1bf4/0x2f00 drivers/media/dvb-core/dvb_frontend.c:2715 dvb_frontend_do_ioctl+0x1c0/0x2e0 drivers/media/dvb-core/dvb_frontend.c:2089 dvb_usercopy+0xb9/0x270 drivers/media/dvb-core/dvbdev.c:941 dvb_frontend_ioctl+0x55/0x80 drivers/media/dvb-core/dvb_frontend.c:2103 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7ff9a0ca80fd Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff9a1381bf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff9a0d9c410 RCX: 00007ff9a0ca80fd RDX: 00000000200001c0 RSI: 0000000080286f4e RDI: 0000000000000003 RBP: 00007ff9a0d0b606 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc30899fcf R14: 00007ffc3089a170 R15: 00007ff9a1381d80 </TASK>
