[Bug] INFO: task hung in hub_activate

From: Sam Sun
Date: Mon Mar 04 2024 - 07:10:44 EST

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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;
}

Attachment: config
Description: Binary data

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