INFO: task syz-executor.0:11097 blocked for more than 143 seconds. Not tainted 5.7.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28560 11097 7002 0x00004004 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x805/0xc90 kernel/sched/core.c:4083 schedule+0x188/0x220 kernel/sched/core.c:4158 schedule_timeout+0x43/0x250 kernel/time/timer.c:1874 pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:650 [inline] queued_spin_unlock arch/x86/include/asm/qspinlock.h:55 [inline] do_raw_spin_unlock+0x134/0x8d0 kernel/locking/spinlock_debug.c:139 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] _raw_spin_unlock_irq+0x1f/0x80 kernel/locking/spinlock.c:199 do_wait_for_common+0x232/0x370 kernel/sched/completion.c:85 console_conditional_schedule+0x30/0x30 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion_timeout+0x41/0x60 kernel/sched/completion.c:157 usb_start_wait_urb+0x10d/0x2a0 drivers/usb/core/message.c:63 proc_bulk+0xa28/0x1070 drivers/usb/core/devio.c:1225 usbdev_do_ioctl drivers/usb/core/devio.c:2529 [inline] usbdev_ioctl+0xf10/0x6520 drivers/usb/core/devio.c:2695 do_vfs_ioctl+0x6ea/0x1a00 fs/ioctl.c:749 usbdev_poll+0x1e0/0x1e0 drivers/usb/core/devio.c:170 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl fs/ioctl.c:771 [inline] __do_sys_ioctl fs/ioctl.c:780 [inline] __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:778 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Showing all locks held in the system: 3 locks held by kworker/u4:5/390: #0: ffff8880ae937518 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x664/0xb20 kernel/sched/fair.c:10512 #1: ffffffff892e8550 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 net/mptcp/pm_netlink.c:860 #2: ffff88804ffa56d8 (key#16){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:358 [inline] #2: ffff88804ffa56d8 (key#16){+...}-{2:2}, at: batadv_nc_purge_paths+0xe0/0x400 net/batman-adv/network-coding.c:441 1 lock held by khungtaskd/1133: #0: ffffffff892e8550 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 net/mptcp/pm_netlink.c:860 1 lock held by in:imklog/6638: #0: ffff88809b43c3b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x25d/0x2f0 fs/file.c:826 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1133 Comm: khungtaskd Not tainted 5.7.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1e9/0x30e lib/dump_stack.c:118 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101 arch_trigger_cpumask_backtrace+0x10/0x10 arch/x86/kernel/apic/hw_nmi.c:38 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xd2a/0xd40 kernel/hung_task.c:289 kthread+0x353/0x380 kernel/kthread.c:268 hungtask_pm_notify+0x50/0x50 kernel/hung_task.c:265 kthread_blkcg+0xd0/0xd0 kernel/kthread.c:1247 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4109 Comm: systemd-journal Not tainted 5.7.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:156 [inline] RIP: 0010:unwind_next_frame+0x1d0/0x1f70 arch/x86/kernel/unwind_orc.c:439 Code: c1 ed 08 48 c7 c0 6c bc 67 8a 48 c7 c1 e4 bc 84 8a 48 29 c1 48 8d 41 03 48 85 c9 48 0f 49 c1 40 8a 35 d4 54 d8 07 48 c1 e8 02 c8 40 84 f6 b9 ff ff ff ff 0f 45 c8 39 e9 0f 86 74 08 00 00 89 RSP: 0018:ffffc90001677970 EFLAGS: 00000006 RAX: 000000000007401e RBX: ffffc90001677b10 RCX: 00000000001d0078 RDX: ffffc90001677ab8 RSI: ffffc90001677a01 RDI: ffffffff8132abbe RBP: 0000000000002aaa R08: dffffc0000000000 R09: ffffc90001677b18 R10: fffff520002cef65 R11: 0000000000000000 R12: ffffffff812aaa27 R13: ffffc90001677ac8 R14: dffffc0000000000 R15: 1ffff920002cef5f FS: 00007f1dd2d388c0(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1dd0355028 CR3: 00000000928da000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: unwind_start arch/x86/include/asm/unwind.h:60 [inline] arch_stack_walk+0x78/0xe0 arch/x86/kernel/stacktrace.c:24 __unwind_start+0x53a/0x630 arch/x86/kernel/unwind_orc.c:690 stack_trace_save+0x150/0x150 kernel/stacktrace.c:124 unwind_start arch/x86/include/asm/unwind.h:60 [inline] arch_stack_walk+0x78/0xe0 arch/x86/kernel/stacktrace.c:24 unwind_start arch/x86/include/asm/unwind.h:60 [inline] arch_stack_walk+0x78/0xe0 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0xad/0x150 kernel/stacktrace.c:123 save_stack mm/kasan/common.c:49 [inline] set_track mm/kasan/common.c:57 [inline] kasan_set_free_info mm/kasan/common.c:317 [inline] __kasan_slab_free+0x125/0x190 mm/kasan/common.c:456 __kasan_slab_free+0x155/0x190 mm/kasan/common.c:458 save_stack mm/kasan/common.c:49 [inline] set_track mm/kasan/common.c:57 [inline] kasan_set_free_info mm/kasan/common.c:317 [inline] __kasan_slab_free+0x125/0x190 mm/kasan/common.c:456 __cache_free mm/slab.c:3426 [inline] kmem_cache_free+0x7e/0xf0 mm/slab.c:3694 do_sys_openat2+0x605/0x770 fs/open.c:1157 do_sys_open fs/open.c:1164 [inline] ksys_open include/linux/syscalls.h:1386 [inline] __do_sys_open fs/open.c:1170 [inline] __se_sys_open fs/open.c:1168 [inline] __x64_sys_open+0x1af/0x1e0 fs/open.c:1168 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:650 [inline] queued_spin_unlock arch/x86/include/asm/qspinlock.h:55 [inline] do_raw_spin_unlock+0x134/0x8d0 kernel/locking/spinlock_debug.c:139 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0xb4/0xd0 kernel/locking/spinlock.c:191 __debug_check_no_obj_freed lib/debugobjects.c:977 [inline] debug_check_no_obj_freed+0x592/0x640 lib/debugobjects.c:998 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0xb4/0xd0 kernel/locking/spinlock.c:191 file_free fs/file_table.c:55 [inline] __fput+0x51c/0x750 fs/file_table.c:298 __cache_free mm/slab.c:3426 [inline] kmem_cache_free+0x7e/0xf0 mm/slab.c:3694 file_free fs/file_table.c:55 [inline] __fput+0x51c/0x750 fs/file_table.c:298 task_work_run+0x147/0x1d0 kernel/task_work.c:123 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:165 [inline] prepare_exit_to_usermode+0x48e/0x600 arch/x86/entry/common.c:196 syscall_return_slowpath+0xf9/0x420 arch/x86/entry/common.c:278 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x7f1dd22c8840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007fff439999c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: fffffffffffffffe RBX: 00007fff43999cd0 RCX: 00007f1dd22c8840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 00005583decc6350 RBP: 000000000000000d R08: 00000000000001e0 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 00005583decc2040 R14: 00007fff43999c90 R15: 00005583decccbc0