On Mon, 4 Mar 2024 20:10:02 +0800 Sam Sun <samsun1006219@xxxxxxxxx> > Dear developers and maintainers, > > We encountered a task hung in function hub_activate(). It was reported > before by Syzbot several years ago > (https://groups.google.com/g/syzkaller-lts-bugs/c/_komEgHj03Y/m/rbcVKyLXBwAJ), > but no repro at that time. We have a C repro this time and kernel > config is attached to this email. The bug report is listed below. Thanks for your report. > > ``` > INFO: task kworker/0:3:4535 blocked for more than 143 seconds. > Not tainted 6.7.0-rc7 #1 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:kworker/0:3 state:D stack:28176 pid:4535 tgid:4535 ppid:2 > flags:0x00004000 > Workqueue: events_power_efficient hub_init_func2 > Call Trace: > <TASK> > context_switch kernel/sched/core.c:5376 [inline] > __schedule+0xcea/0x59e0 kernel/sched/core.c:6688 > __schedule_loop kernel/sched/core.c:6763 [inline] > schedule+0xe9/0x270 kernel/sched/core.c:6778 > schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835 > __mutex_lock_common kernel/locking/mutex.c:679 [inline] > __mutex_lock+0x509/0x940 kernel/locking/mutex.c:747 > device_lock include/linux/device.h:992 [inline] > hub_activate+0x320/0x1df0 drivers/usb/core/hub.c:1048 > process_one_work+0x878/0x15c0 kernel/workqueue.c:2627 > process_scheduled_works kernel/workqueue.c:2700 [inline] > worker_thread+0x855/0x1200 kernel/workqueue.c:2781 > kthread+0x2cc/0x3b0 kernel/kthread.c:388 > ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 > ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 > </TASK> > INFO: task kworker/0:4:7627 blocked for more than 143 seconds. > Not tainted 6.7.0-rc7 #1 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:kworker/0:4 state:D stack:28176 pid:7627 tgid:7627 ppid:2 > flags:0x00004000 > Workqueue: usb_hub_wq hub_event > Call Trace: > <TASK> > context_switch kernel/sched/core.c:5376 [inline] > __schedule+0xcea/0x59e0 kernel/sched/core.c:6688 > __schedule_loop kernel/sched/core.c:6763 [inline] > schedule+0xe9/0x270 kernel/sched/core.c:6778 > schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835 > __mutex_lock_common kernel/locking/mutex.c:679 [inline] > __mutex_lock+0x509/0x940 kernel/locking/mutex.c:747 > device_lock include/linux/device.h:992 [inline] > hub_event+0x1b0/0x4cd0 drivers/usb/core/hub.c:5768 > process_one_work+0x878/0x15c0 kernel/workqueue.c:2627 > process_scheduled_works kernel/workqueue.c:2700 [inline] > worker_thread+0x855/0x1200 kernel/workqueue.c:2781 > kthread+0x2cc/0x3b0 kernel/kthread.c:388 > ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 > ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 > </TASK> > INFO: task syz-executor111:8108 blocked for more than 143 seconds. > Not tainted 6.7.0-rc7 #1 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor111 state:D stack:25600 pid:8108 tgid:8108 > ppid:8106 flags:0x00000006 > Call Trace: > <TASK> > context_switch kernel/sched/core.c:5376 [inline] > __schedule+0xcea/0x59e0 kernel/sched/core.c:6688 > __schedule_loop kernel/sched/core.c:6763 [inline] > schedule+0xe9/0x270 kernel/sched/core.c:6778 > schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835 > __mutex_lock_common kernel/locking/mutex.c:679 [inline] > __mutex_lock+0x509/0x940 kernel/locking/mutex.c:747 > device_lock include/linux/device.h:992 [inline] > usb_deauthorize_interface+0x4d/0x130 drivers/usb/core/message.c:1789 > interface_authorized_store+0xaf/0x110 drivers/usb/core/sysfs.c:1178 > dev_attr_store+0x54/0x80 drivers/base/core.c:2366 > sysfs_kf_write+0x114/0x170 fs/sysfs/file.c:136 > kernfs_fop_write_iter+0x337/0x500 fs/kernfs/file.c:334 > call_write_iter include/linux/fs.h:2020 [inline] > new_sync_write fs/read_write.c:491 [inline] > vfs_write+0x96a/0xd80 fs/read_write.c:584 > ksys_write+0x122/0x250 fs/read_write.c:637 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x63/0x6b > RIP: 0033:0x7f78ff4f187d > RSP: 002b:00007ffdb1de8df8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007f78ff4f187d > RDX: 0000000000000015 RSI: 0000000020000040 RDI: 0000000000000004 > RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f78ff546bb5 > R10: 0000000000000011 R11: 0000000000000246 R12: 00007f78ff54204e > R13: 00007ffdb1de9058 R14: 00007ffdb1de8e20 R15: 00007ffdb1de8e10 > </TASK> > INFO: task syz-executor111:8110 blocked for more than 143 seconds. > Not tainted 6.7.0-rc7 #1 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor111 state:D stack:28096 pid:8110 tgid:8110 > ppid:8107 flags:0x00004006 > Call Trace: > <TASK> > context_switch kernel/sched/core.c:5376 [inline] > __schedule+0xcea/0x59e0 kernel/sched/core.c:6688 > __schedule_loop kernel/sched/core.c:6763 [inline] > schedule+0xe9/0x270 kernel/sched/core.c:6778 > schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835 > __mutex_lock_common kernel/locking/mutex.c:679 [inline] > __mutex_lock+0x509/0x940 kernel/locking/mutex.c:747 > device_lock include/linux/device.h:992 [inline] > usb_deauthorize_device+0x2a/0x110 drivers/usb/core/hub.c:2633 > authorized_store+0x122/0x140 drivers/usb/core/sysfs.c:747 > dev_attr_store+0x54/0x80 drivers/base/core.c:2366 > sysfs_kf_write+0x114/0x170 fs/sysfs/file.c:136 > kernfs_fop_write_iter+0x337/0x500 fs/kernfs/file.c:334 > call_write_iter include/linux/fs.h:2020 [inline] > new_sync_write fs/read_write.c:491 [inline] > vfs_write+0x96a/0xd80 fs/read_write.c:584 > ksys_write+0x122/0x250 fs/read_write.c:637 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x63/0x6b > RIP: 0033:0x7f78ff4f187d > RSP: 002b:00007ffdb1de8df8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007f78ff4f187d > RDX: 0000000000000015 RSI: 0000000020000040 RDI: 0000000000000003 > RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f78ff546bb5 > R10: 0000000000000013 R11: 0000000000000246 R12: 00007f78ff54204e > R13: 00007ffdb1de9058 R14: 00007ffdb1de8e20 R15: 00007ffdb1de8e10 > </TASK> > INFO: task syz-executor111:8113 blocked for more than 143 seconds. > Not tainted 6.7.0-rc7 #1 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor111 state:D stack:27984 pid:8113 tgid:8113 > ppid:8109 flags:0x00004006 > Call Trace: > <TASK> > context_switch kernel/sched/core.c:5376 [inline] > __schedule+0xcea/0x59e0 kernel/sched/core.c:6688 > __schedule_loop kernel/sched/core.c:6763 [inline] > schedule+0xe9/0x270 kernel/sched/core.c:6778 > kernfs_drain+0x36c/0x550 fs/kernfs/dir.c:505 > __kernfs_remove+0x280/0x650 fs/kernfs/dir.c:1465 > kernfs_remove_by_name_ns+0xb4/0x130 fs/kernfs/dir.c:1673 > kernfs_remove_by_name include/linux/kernfs.h:623 [inline] > remove_files+0x96/0x1c0 fs/sysfs/group.c:28 > sysfs_remove_group+0x8b/0x180 fs/sysfs/group.c:292 > sysfs_remove_groups fs/sysfs/group.c:316 [inline] > sysfs_remove_groups+0x60/0xa0 fs/sysfs/group.c:308 > device_remove_groups drivers/base/core.c:2734 [inline] > device_remove_attrs+0x192/0x290 drivers/base/core.c:2909 > device_del+0x391/0xa30 drivers/base/core.c:3813 > usb_disable_device+0x360/0x7b0 drivers/usb/core/message.c:1416 > usb_set_configuration+0x1243/0x1c40 drivers/usb/core/message.c:2063 > usb_deauthorize_device+0xe4/0x110 drivers/usb/core/hub.c:2638 > authorized_store+0x122/0x140 drivers/usb/core/sysfs.c:747 > dev_attr_store+0x54/0x80 drivers/base/core.c:2366 > sysfs_kf_write+0x114/0x170 fs/sysfs/file.c:136 > kernfs_fop_write_iter+0x337/0x500 fs/kernfs/file.c:334 > call_write_iter include/linux/fs.h:2020 [inline] > new_sync_write fs/read_write.c:491 [inline] > vfs_write+0x96a/0xd80 fs/read_write.c:584 > ksys_write+0x122/0x250 fs/read_write.c:637 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x63/0x6b > RIP: 0033:0x7f78ff4f187d > RSP: 002b:00007ffdb1de8df8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007f78ff4f187d > RDX: 0000000000000015 RSI: 0000000020000040 RDI: 0000000000000003 > RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f78ff546bb5 > R10: 0000000000000013 R11: 0000000000000246 R12: 00007f78ff54204e > R13: 00007ffdb1de9058 R14: 00007ffdb1de8e20 R15: 00007ffdb1de8e10 > </TASK> > INFO: task syz-executor111:8112 blocked for more than 143 seconds. > Not tainted 6.7.0-rc7 #1 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor111 state:D stack:28224 pid:8112 tgid:8112 > ppid:8111 flags:0x00000006 > Call Trace: > <TASK> > context_switch kernel/sched/core.c:5376 [inline] > __schedule+0xcea/0x59e0 kernel/sched/core.c:6688 > __schedule_loop kernel/sched/core.c:6763 [inline] > schedule+0xe9/0x270 kernel/sched/core.c:6778 > schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835 > __mutex_lock_common kernel/locking/mutex.c:679 [inline] > __mutex_lock+0x509/0x940 kernel/locking/mutex.c:747 > device_lock include/linux/device.h:992 [inline] > usb_deauthorize_device+0x2a/0x110 drivers/usb/core/hub.c:2633 > authorized_store+0x122/0x140 drivers/usb/core/sysfs.c:747 > dev_attr_store+0x54/0x80 drivers/base/core.c:2366 > sysfs_kf_write+0x114/0x170 fs/sysfs/file.c:136 > kernfs_fop_write_iter+0x337/0x500 fs/kernfs/file.c:334 > call_write_iter include/linux/fs.h:2020 [inline] > new_sync_write fs/read_write.c:491 [inline] > vfs_write+0x96a/0xd80 fs/read_write.c:584 > ksys_write+0x122/0x250 fs/read_write.c:637 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x63/0x6b > RIP: 0033:0x7f78ff4f187d > RSP: 002b:00007ffdb1de8df8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007f78ff4f187d > RDX: 0000000000000015 RSI: 0000000020000040 RDI: 0000000000000003 > RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f78ff546bb5 > R10: 0000000000000013 R11: 0000000000000246 R12: 00007f78ff54204e > R13: 00007ffdb1de9058 R14: 00007ffdb1de8e20 R15: 00007ffdb1de8e10 > </TASK> > > Showing all locks held in the system: > 1 lock held by khungtaskd/32: > #0: ffffffff8cfa9a60 (rcu_read_lock){....}-{1:2}, at: > rcu_lock_acquire include/linux/rcupdate.h:301 [inline] > #0: ffffffff8cfa9a60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock > include/linux/rcupdate.h:747 [inline] > #0: ffffffff8cfa9a60 (rcu_read_lock){....}-{1:2}, at: > debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614 > 3 locks held by kworker/0:3/4535: > #0: ffff88801307a138 > ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: > process_one_work+0x77b/0x15c0 kernel/workqueue.c:2602 > #1: ffffc90002a1fd88 > ((work_completion)(&(&hub->init_work)->work)){+.+.}-{0:0}, at: > process_one_work+0x7dd/0x15c0 kernel/workqueue.c:2603 > #2: ffff88801c280190 (&dev->mutex){....}-{3:3}, at: device_lock > include/linux/device.h:992 [inline] > #2: ffff88801c280190 (&dev->mutex){....}-{3:3}, at: > hub_activate+0x320/0x1df0 drivers/usb/core/hub.c:1048 > 3 locks held by kworker/0:4/7627: > #0: ffff888013f4ed38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: > process_one_work+0x77b/0x15c0 kernel/workqueue.c:2602 > #1: ffffc9000fe27d88 ((work_completion)(&hub->events)){+.+.}-{0:0}, > at: process_one_work+0x7dd/0x15c0 kernel/workqueue.c:2603 > #2: ffff88801c280190 (&dev->mutex){....}-{3:3}, at: device_lock > include/linux/device.h:992 [inline] > #2: ffff88801c280190 (&dev->mutex){....}-{3:3}, at: > hub_event+0x1b0/0x4cd0 drivers/usb/core/hub.c:5768 > 4 locks held by syz-executor111/8108: > #0: ffff88801d00a418 (sb_writers#5){.+.+}-{0:0}, at: > ksys_write+0x122/0x250 fs/read_write.c:637 > #1: ffff88801d83d488 (&of->mutex){+.+.}-{3:3}, at: > kernfs_fop_write_iter+0x27c/0x500 fs/kernfs/file.c:325 > #2: ffff888019fd5e88 (kn->active#63){++++}-{0:0}, at: > kernfs_fop_write_iter+0x2a0/0x500 fs/kernfs/file.c:326 > #3: ffff88801c280190 (&dev->mutex){....}-{3:3}, at: device_lock > include/linux/device.h:992 [inline] > #3: ffff88801c280190 (&dev->mutex){....}-{3:3}, at: > usb_deauthorize_interface+0x4d/0x130 drivers/usb/core/message.c:1789 > 3 locks held by syz-executor111/8110: > #0: ffff88801d00a418 (sb_writers#5){.+.+}-{0:0}, at: > ksys_write+0x122/0x250 fs/read_write.c:637 > #1: ffff888019becc88 (&of->mutex){+.+.}-{3:3}, at: > kernfs_fop_write_iter+0x27c/0x500 fs/kernfs/file.c:325 > #2: ffff88801c280190 (&dev->mutex){....}-{3:3}, at: device_lock > include/linux/device.h:992 [inline] > #2: ffff88801c280190 (&dev->mutex){....}-{3:3}, at: > usb_deauthorize_device+0x2a/0x110 drivers/usb/core/hub.c:2633 > 4 locks held by syz-executor111/8113: > #0: ffff88801d00a418 (sb_writers#5){.+.+}-{0:0}, at: > ksys_write+0x122/0x250 fs/read_write.c:637 > #1: ffff8881098b4c88 (&of->mutex){+.+.}-{3:3}, at: > kernfs_fop_write_iter+0x27c/0x500 fs/kernfs/file.c:325 > #2: ffff88801c280190 (&dev->mutex){....}-{3:3}, at: device_lock > include/linux/device.h:992 [inline] > #2: ffff88801c280190 (&dev->mutex){....}-{3:3}, at: > usb_deauthorize_device+0x2a/0x110 drivers/usb/core/hub.c:2633 > #3: ffff888019fd5e88 (kn->active#63){++++}-{0:0}, at: > __kernfs_remove+0x280/0x650 fs/kernfs/dir.c:1465 > 3 locks held by syz-executor111/8112: > #0: ffff88801d00a418 (sb_writers#5){.+.+}-{0:0}, at: > ksys_write+0x122/0x250 fs/read_write.c:637 > #1: ffff88810503f488 (&of->mutex){+.+.}-{3:3}, at: > kernfs_fop_write_iter+0x27c/0x500 fs/kernfs/file.c:325 > #2: ffff88801c280190 (&dev->mutex){....}-{3:3}, at: device_lock > include/linux/device.h:992 [inline] > #2: ffff88801c280190 (&dev->mutex){....}-{3:3}, at: > usb_deauthorize_device+0x2a/0x110 drivers/usb/core/hub.c:2633 > > ============================================= > > NMI backtrace for cpu 1 > CPU: 1 PID: 32 Comm: khungtaskd Not tainted 6.7.0-rc7 #1 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 > Call Trace: > <TASK> > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 > nmi_cpu_backtrace+0x29c/0x350 lib/nmi_backtrace.c:113 > nmi_trigger_cpumask_backtrace+0x299/0x300 lib/nmi_backtrace.c:62 > trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] > check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] > watchdog+0xe7a/0x1100 kernel/hung_task.c:379 > kthread+0x2cc/0x3b0 kernel/kthread.c:388 > ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 > ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 > </TASK> > Sending NMI from CPU 1 to CPUs 0: > NMI backtrace for cpu 0 > CPU: 0 PID: 4522 Comm: systemd-journal Not tainted 6.7.0-rc7 #1 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 > RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:85 [inline] > RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline] > RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:127 [inline] > RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] > RIP: 0010:check_region_inline mm/kasan/generic.c:178 [inline] > RIP: 0010:kasan_check_range+0x10e/0x190 mm/kasan/generic.c:187 > Code: 5d 41 5c c3 44 89 c2 e8 f0 ed ff ff 83 f0 01 5b 5d 41 5c c3 48 > 85 d2 74 e1 48 01 ea eb 09 48 83 c0 01 48 39 d0 74 d3 80 38 00 <74> f2 > eb b1 41 bc 08 00 00 00 45 29 dc 49 8d 14 2c eb 0c 48 83 c0 > RSP: 0018:ffffc9000273fa88 EFLAGS: 00000046 > RAX: fffffbfff23e55d2 RBX: fffffbfff23e55d3 RCX: ffffffff816515ee > RDX: fffffbfff23e55d3 RSI: 0000000000000008 RDI: ffffffff91f2ae90 > RBP: fffffbfff23e55d2 R08: 0000000000000000 R09: fffffbfff23e55d2 > R10: ffffffff91f2ae97 R11: 0000000000000000 R12: ffff8881078d0b80 > R13: 0000000000000000 R14: ffff8881078d00c0 R15: 00000000000400b2 > FS: 00007f26bae49900(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f26b911d000 CR3: 000000001b582000 CR4: 0000000000750ef0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > PKRU: 55555554 > Call Trace: > <NMI> > </NMI> > <TASK> > instrument_atomic_read include/linux/instrumented.h:68 [inline] > _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] > hlock_class+0x4e/0x120 kernel/locking/lockdep.c:228 > check_wait_context kernel/locking/lockdep.c:4774 [inline] > __lock_acquire+0x42d/0x3bb0 kernel/locking/lockdep.c:5087 > lock_acquire kernel/locking/lockdep.c:5754 [inline] > lock_acquire+0x1b1/0x530 kernel/locking/lockdep.c:5719 > __fs_reclaim_acquire mm/page_alloc.c:3693 [inline] > fs_reclaim_acquire+0x100/0x150 mm/page_alloc.c:3707 > might_alloc include/linux/sched/mm.h:303 [inline] > slab_pre_alloc_hook mm/slab.h:710 [inline] > slab_alloc_node mm/slab.c:3221 [inline] > slab_alloc mm/slab.c:3246 [inline] > __kmem_cache_alloc_lru mm/slab.c:3423 [inline] > kmem_cache_alloc+0x3d/0x370 mm/slab.c:3432 > getname_flags.part.0+0x50/0x4f0 fs/namei.c:140 > getname_flags include/linux/audit.h:321 [inline] > getname+0x92/0xd0 fs/namei.c:219 > do_sys_openat2+0xe8/0x1c0 fs/open.c:1431 > do_sys_open fs/open.c:1452 [inline] > __do_sys_openat fs/open.c:1468 [inline] > __se_sys_openat fs/open.c:1463 [inline] > __x64_sys_openat+0x140/0x1f0 fs/open.c:1463 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x63/0x6b > RIP: 0033:0x7f26bb3171a4 > Code: 84 00 00 00 00 00 44 89 54 24 0c e8 36 58 f9 ff 44 8b 54 24 0c > 44 89 e2 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d > 00 f0 ff ff 77 34 44 89 c7 89 44 24 0c e8 68 58 f9 ff 8b 44 > RSP: 002b:00007ffdb19f8290 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 > RAX: ffffffffffffffda RBX: 0000555698ac1590 RCX: 00007f26bb3171a4 > RDX: 0000000000080802 RSI: 0000555698af7f50 RDI: 00000000ffffff9c > RBP: 0000555698af7f50 R08: 0000000000000000 R09: ffffffffffffff01 > R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000080802 > R13: 00000000fffffffa R14: 0000555698ac5eb0 R15: 0000000000000002 > </TASK> > INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.608 msecs > ``` > > If you have any questions, please contact us. > > Reported by Yue Sun <samsun1006219@xxxxxxxxx> > Reported by xingwei lee <xrivendell7@xxxxxxxxx> > > Best Regards, > Yue syz-executor111/8108 syz-executor111/8113: #2: ffff888019fd5e88 (kn->active#63) #2: ffff88801c280190 (&dev->mutex) #3: ffff888019fd5e88 (kn->active#63) #3: ffff88801c280190 (&dev->mutex) deadlock behind task hung cause of dev->mutex, another case of known issue [1]. [1] https://lore.kernel.org/lkml/d314e471-0251-461e-988d-70add0c6ebf6@xxxxxxxxxxxxxxxxxxx/
