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. ``` 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
// autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include <dirent.h> #include <endian.h> #include <errno.h> #include <fcntl.h> #include <signal.h> #include <stdarg.h> #include <stdbool.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/prctl.h> #include <sys/stat.h> #include <sys/syscall.h> #include <sys/types.h> #include <sys/wait.h> #include <time.h> #include <unistd.h> static unsigned long long procid; static void sleep_ms(uint64_t ms) { usleep(ms * 1000); } static uint64_t current_time_ms(void) { struct timespec ts; if (clock_gettime(CLOCK_MONOTONIC, &ts)) exit(1); return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; } static bool write_file(const char* file, const char* what, ...) { char buf[1024]; va_list args; va_start(args, what); vsnprintf(buf, sizeof(buf), what, args); va_end(args); buf[sizeof(buf) - 1] = 0; int len = strlen(buf); int fd = open(file, O_WRONLY | O_CLOEXEC); if (fd == -1) return false; if (write(fd, buf, len) != len) { int err = errno; close(fd); errno = err; return false; } close(fd); return true; } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); for (int i = 0; i < 100; i++) { if (waitpid(-1, status, WNOHANG | __WALL) == pid) return; usleep(1000); } DIR* dir = opendir("/sys/fs/fuse/connections"); if (dir) { for (;;) { struct dirent* ent = readdir(dir); if (!ent) break; if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) continue; char abort[300]; snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", ent->d_name); int fd = open(abort, O_WRONLY); if (fd == -1) { continue; } if (write(fd, abort, 1) < 0) { } close(fd); } closedir(dir); } else { } while (waitpid(-1, status, __WALL) != pid) { } } static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); write_file("/proc/self/oom_score_adj", "1000"); } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter = 0; for (;; iter++) { int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { setup_test(); execute_one(); exit(0); } int status = 0; uint64_t start = current_time_ms(); for (;;) { if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; sleep_ms(1); if (current_time_ms() - start < 5000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; memcpy((void*)0x20000000, "/sys/devices/platform/dummy_hcd.7/usb8/authorized\000", 50); res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000000ul, /*flags=*/2ul, /*mode=*/0ul); if (res != -1) r[0] = res; sprintf((char*)0x20000040, "%020llu", (long long)0); *(uint8_t*)0x20000054 = 0; syscall(__NR_write, /*fd=*/r[0], /*buf=*/0x20000040ul, /*len=*/0x15ul); syscall(__NR_sendmsg, /*fd=*/-1, /*msg=*/0ul, /*f=*/0ul); syscall(__NR_write, /*fd=*/-1, /*buf=*/0ul, /*len=*/0ul); sprintf((char*)0x20000080, "%020llu", (long long)0x890000000); *(uint8_t*)0x20000094 = 0; syscall(__NR_write, /*fd=*/r[0], /*buf=*/0x20000080ul, /*len=*/0x15ul); memcpy((void*)0x20000080, "/sys/devices/platform/dummy_hcd.7/usb8/8-0:1.0/authorized\000", 58); res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000080ul, /*flags=*/2ul, /*mode=*/0ul); if (res != -1) r[1] = res; sprintf((char*)0x20000040, "%020llu", (long long)0x74); *(uint8_t*)0x20000054 = 0; syscall(__NR_write, /*fd=*/r[1], /*buf=*/0x20000040ul, /*len=*/0x15ul); } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); for (procid = 0; procid < 4; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }
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