Hello, syzbot found the following issue on: HEAD commit: f7efed9f38f8 Add linux-next specific files for 20230616 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=11ec12f3280000 kernel config: https://syzkaller.appspot.com/x/.config?x=60b1a32485a77c16 dashboard link: https://syzkaller.appspot.com/bug?extid=8fe2d362af0e1cba8735 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=152875ef280000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1629f75b280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/95bcbee03439/disk-f7efed9f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6fd295caa4de/vmlinux-f7efed9f.xz kernel image: https://storage.googleapis.com/syzbot-assets/69c038a34b5f/bzImage-f7efed9f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8fe2d362af0e1cba8735@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task syz-executor188:5032 blocked for more than 143 seconds. Not tainted 6.4.0-rc6-next-20230616-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor188 state:D stack:27424 pid:5032 ppid:5028 flags:0x00004002 Call Trace: <TASK> context_switch kernel/sched/core.c:5380 [inline] __schedule+0x1d15/0x5790 kernel/sched/core.c:6709 schedule+0xde/0x1a0 kernel/sched/core.c:6785 schedule_timeout+0x276/0x2b0 kernel/time/timer.c:2143 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x1ce/0x5c0 kernel/sched/completion.c:106 __flush_work+0x595/0xb60 kernel/workqueue.c:3383 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3470 uhid_dev_destroy drivers/hid/uhid.c:585 [inline] uhid_char_release+0xca/0x210 drivers/hid/uhid.c:663 __fput+0x289/0xac0 fs/file_table.c:378 task_work_run+0x16f/0x270 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xadc/0x2a30 kernel/exit.c:874 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024 __do_sys_exit_group kernel/exit.c:1035 [inline] __se_sys_exit_group kernel/exit.c:1033 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1033 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fa196a81b19 RSP: 002b:00007ffc33991898 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fa196af5330 RCX: 00007fa196a81b19 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000001 R10: 00007ffc33991360 R11: 0000000000000246 R12: 00007fa196af5330 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 </TASK> INFO: task syz-executor188:5038 blocked for more than 145 seconds. Not tainted 6.4.0-rc6-next-20230616-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor188 state:D stack:28176 pid:5038 ppid:5036 flags:0x00004002 Call Trace: <TASK> context_switch kernel/sched/core.c:5380 [inline] __schedule+0x1d15/0x5790 kernel/sched/core.c:6709 schedule+0xde/0x1a0 kernel/sched/core.c:6785 schedule_timeout+0x276/0x2b0 kernel/time/timer.c:2143 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x1ce/0x5c0 kernel/sched/completion.c:106 __flush_work+0x595/0xb60 kernel/workqueue.c:3383 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3470 uhid_dev_destroy drivers/hid/uhid.c:585 [inline] uhid_char_release+0xca/0x210 drivers/hid/uhid.c:663 __fput+0x289/0xac0 fs/file_table.c:378 task_work_run+0x16f/0x270 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xadc/0x2a30 kernel/exit.c:874 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024 __do_sys_exit_group kernel/exit.c:1035 [inline] __se_sys_exit_group kernel/exit.c:1033 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1033 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fa196a81b19 RSP: 002b:00007ffc33991898 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fa196af5330 RCX: 00007fa196a81b19 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000001 R10: 00007ffc33991360 R11: 0000000000000246 R12: 00007fa196af5330 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 </TASK> INFO: task syz-executor188:5042 blocked for more than 147 seconds. Not tainted 6.4.0-rc6-next-20230616-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor188 state:D stack:27136 pid:5042 ppid:5037 flags:0x00004002 Call Trace: <TASK> context_switch kernel/sched/core.c:5380 [inline] __schedule+0x1d15/0x5790 kernel/sched/core.c:6709 schedule+0xde/0x1a0 kernel/sched/core.c:6785 schedule_timeout+0x276/0x2b0 kernel/time/timer.c:2143 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x1ce/0x5c0 kernel/sched/completion.c:106 __flush_work+0x595/0xb60 kernel/workqueue.c:3383 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3470 uhid_dev_destroy drivers/hid/uhid.c:585 [inline] uhid_char_release+0xca/0x210 drivers/hid/uhid.c:663 __fput+0x289/0xac0 fs/file_table.c:378 task_work_run+0x16f/0x270 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xadc/0x2a30 kernel/exit.c:874 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024 __do_sys_exit_group kernel/exit.c:1035 [inline] __se_sys_exit_group kernel/exit.c:1033 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1033 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fa196a81b19 RSP: 002b:00007ffc33991898 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fa196af5330 RCX: 00007fa196a81b19 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000001 R10: 00007ffc33991360 R11: 0000000000000246 R12: 00007fa196af5330 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 </TASK> INFO: task syz-executor188:5046 blocked for more than 150 seconds. Not tainted 6.4.0-rc6-next-20230616-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor188 state:D stack:28048 pid:5046 ppid:5029 flags:0x00004002 Call Trace: <TASK> context_switch kernel/sched/core.c:5380 [inline] __schedule+0x1d15/0x5790 kernel/sched/core.c:6709 schedule+0xde/0x1a0 kernel/sched/core.c:6785 schedule_timeout+0x276/0x2b0 kernel/time/timer.c:2143 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x1ce/0x5c0 kernel/sched/completion.c:106 __flush_work+0x595/0xb60 kernel/workqueue.c:3383 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3470 uhid_dev_destroy drivers/hid/uhid.c:585 [inline] uhid_char_release+0xca/0x210 drivers/hid/uhid.c:663 __fput+0x289/0xac0 fs/file_table.c:378 task_work_run+0x16f/0x270 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xadc/0x2a30 kernel/exit.c:874 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024 __do_sys_exit_group kernel/exit.c:1035 [inline] __se_sys_exit_group kernel/exit.c:1033 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1033 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fa196a81b19 RSP: 002b:00007ffc33991898 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fa196af5330 RCX: 00007fa196a81b19 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000001 R10: 00007ffc33991360 R11: 0000000000000246 R12: 00007fa196af5330 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 </TASK> Showing all locks held in the system: 3 locks held by kworker/0:0/7: 1 lock held by rcu_tasks_kthre/13: #0: ffffffff8c9a1ab0 ( rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xe60 kernel/rcu/tasks.h:568 1 lock held by rcu_tasks_trace/14: #0: ffffffff8c9a1770 ( rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3} , at: rcu_tasks_one_gp+0x31/0xe60 kernel/rcu/tasks.h:568 3 locks held by kworker/1:0/22: 1 lock held by khungtaskd/28: #0: ffffffff8c9a26c0 (rcu_read_lock ){....}-{1:2} , at: debug_show_all_locks+0x51/0x390 kernel/locking/lockdep.c:6615 3 locks held by kworker/1:2/776: 3 locks held by kworker/0:2/919: 3 locks held by kworker/0:3/3948: 2 locks held by getty/4779: #0: ffff88814a6b7098 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
