INFO: task kworker/1:4:2562 blocked for more than 143 seconds.
Not tainted 5.8.0-rc3-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/1:4 D23384 2562 2 0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
context_switch kernel/sched/core.c:3453 [inline]
__schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178
schedule+0xd0/0x2a0 kernel/sched/core.c:4253
schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1873
__down_common kernel/locking/semaphore.c:220 [inline]
__down+0x183/0x2a0 kernel/locking/semaphore.c:237
down+0x57/0x80 kernel/locking/semaphore.c:61
console_lock+0x25/0x80 kernel/printk/printk.c:2309
do_register_framebuffer drivers/video/fbdev/core/fbmem.c:1660 [inline]
register_framebuffer+0x570/0x980 drivers/video/fbdev/core/fbmem.c:1832
dlfb_usb_probe.cold+0x1ae6/0x1f4d drivers/video/fbdev/udlfb.c:1735
usb_probe_interface+0x2f7/0x780 drivers/usb/core/driver.c:374
really_probe+0x282/0x8a0 drivers/base/dd.c:525
driver_probe_device+0xfe/0x1d0 drivers/base/dd.c:701
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:807
bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
__device_attach+0x28d/0x3f0 drivers/base/dd.c:873
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
device_add+0xacf/0x1b00 drivers/base/core.c:2680
usb_set_configuration+0xef6/0x17a0 drivers/usb/core/message.c:2032
usb_generic_driver_probe+0xba/0xf2 drivers/usb/core/generic.c:241
usb_probe_device+0xc6/0x210 drivers/usb/core/driver.c:272
really_probe+0x282/0x8a0 drivers/base/dd.c:525
driver_probe_device+0xfe/0x1d0 drivers/base/dd.c:701
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:807
bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431
__device_attach+0x28d/0x3f0 drivers/base/dd.c:873
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491
device_add+0xacf/0x1b00 drivers/base/core.c:2680
usb_new_device.cold+0x748/0x103b drivers/usb/core/hub.c:2554
hub_port_connect drivers/usb/core/hub.c:5208 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5348 [inline]
port_event drivers/usb/core/hub.c:5494 [inline]
hub_event+0x2033/0x3e40 drivers/usb/core/hub.c:5576
process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
process_scheduled_works kernel/workqueue.c:2331 [inline]
worker_thread+0x82b/0x1120 kernel/workqueue.c:2417
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
INFO: task syz-executor.0:20434 blocked for more than 143 seconds.
Not tainted 5.8.0-rc3-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D28712 20434 6818 0x00004004
Call Trace:
context_switch kernel/sched/core.c:3453 [inline]
__schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178
schedule+0xd0/0x2a0 kernel/sched/core.c:4253
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4312
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103
get_fb_info.part.0+0x18/0x80 drivers/video/fbdev/core/fbmem.c:67
get_fb_info include/linux/fs.h:902 [inline]
fb_open+0x8c/0x430 drivers/video/fbdev/core/fbmem.c:1408
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x501/0x1290 fs/open.c:828
do_open fs/namei.c:3243 [inline]
path_openat+0x1bb9/0x2750 fs/namei.c:3360
do_filp_open+0x17e/0x3c0 fs/namei.c:3387
do_sys_openat2+0x16f/0x3b0 fs/open.c:1179
do_sys_open fs/open.c:1195 [inline]
__do_sys_openat fs/open.c:1209 [inline]
__se_sys_openat fs/open.c:1204 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1204
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb29
Code: Bad RIP value.
RSP: 002b:00007fd52bd89c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00000000004f86e0 RCX: 000000000045cb29
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000007c1 R14: 00000000004caafb R15: 00007fd52bd8a6d4
Showing all locks held in the system:
1 lock held by khungtaskd/1139:
#0: ffffffff89bc1180 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779
6 locks held by kworker/1:4/2562:
#0: ffff8880a6729938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8880a6729938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
#0: ffff8880a6729938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
#0: ffff8880a6729938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
#0: ffff8880a6729938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
#0: ffff8880a6729938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240
#1: ffffc9000850fda8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244
#2: ffff88821877d218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline]
#2: ffff88821877d218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1b6/0x3e40 drivers/usb/core/hub.c:5522
#3: ffff888097ddf218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline]
#3: ffff888097ddf218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x3f0 drivers/base/dd.c:850
#4: ffff8880a22f01a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:768 [inline]
#4: ffff8880a22f01a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x3f0 drivers/base/dd.c:850
#5: ffffffff8a0f8a08 (registration_lock){+.+.}-{3:3}, at: register_framebuffer+0x79/0x980 drivers/video/fbdev/core/fbmem.c:1831
1 lock held by in:imklog/6508:
#0: ffff8880a78ebb30 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826
2 locks held by syz-executor.0/20392:
1 lock held by syz-executor.0/20434:
#0: ffffffff8a0f8a08 (registration_lock){+.+.}-{3:3}, at: get_fb_info.part.0+0x18/0x80 drivers/video/fbdev/core/fbmem.c:67
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1139 Comm: khungtaskd Not tainted 5.8.0-rc3-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+0x18f/0x20d lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
watchdog+0xd7d/0x1000 kernel/hung_task.c:295
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 20392 Comm: syz-executor.0 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__sanitizer_cov_trace_pc+0x30/0x60 kernel/kcov.c:197
Code: ff 01 00 65 8b 05 50 47 8e 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 35 8b 82 04 14 00 00 85 c0 74 2b 8b 82 e0 13 00 00 <83> f8 02 75 20 48 8b 8a e8 13 00 00 8b 92 e4 13 00 00 48 8b 01 48
RSP: 0018:ffffc900081175a8 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 0000000000000050 RCX: ffffffff83c646a4
RDX: ffff88803b150400 RSI: ffffffff83c646b2 RDI: 0000000000000004
RBP: 0000000000000050 R08: 0000000000000001 R09: ffff8880a3afa75f
R10: 0000000000000050 R11: 0000000000000000 R12: ffff8880000a0050
R13: ffff8880000a0050 R14: 0000000000000000 R15: 00000000efc02b7a
FS: 00007fd52bdcc700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c00fd0e3c0 CR3: 00000000a15b9000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
vga16fb_fillrect+0x9e2/0x193b drivers/video/fbdev/vga16fb.c:926
bit_clear_margins+0x2d5/0x4a0 drivers/video/fbdev/core/bitblit.c:232
fbcon_clear_margins+0x1d5/0x230 drivers/video/fbdev/core/fbcon.c:1381
fbcon_switch+0xb6e/0x16c0 drivers/video/fbdev/core/fbcon.c:2363
redraw_screen+0x2ae/0x770 drivers/tty/vt/vt.c:1015
fbcon_modechanged+0x575/0x710 drivers/video/fbdev/core/fbcon.c:3001
fbcon_update_vcs+0x3a/0x50 drivers/video/fbdev/core/fbcon.c:3048
fb_set_var+0xae8/0xd60 drivers/video/fbdev/core/fbmem.c:1056
do_fb_ioctl+0x33f/0x6c0 drivers/video/fbdev/core/fbmem.c:1109
fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1185
vfs_ioctl fs/ioctl.c:48 [inline]
ksys_ioctl+0x11a/0x180 fs/ioctl.c:753
__do_sys_ioctl fs/ioctl.c:762 [inline]
__se_sys_ioctl fs/ioctl.c:760 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb29
Code: Bad RIP value.
RSP: 002b:00007fd52bdcbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e55e0 RCX: 000000000045cb29
RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000005
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000002fd R14: 00000000004c58a5 R15: 00007fd52bdcc6d4