INFO: task syz-executor:2646 blocked for more than 143 seconds.
Not tainted 6.11.0-rc1-syzkaller-00033-g25f51b76f90f #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D
stack:24240 pid:2646 tgid:2646 ppid:1 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5188 [inline]
__schedule+0xcda/0x2f80 kernel/sched/core.c:6529
__schedule_loop kernel/sched/core.c:6606 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6621
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
rwsem_down_read_slowpath+0x61e/0xb20 kernel/locking/rwsem.c:1086
__down_read_common kernel/locking/rwsem.c:1250 [inline]
__down_read kernel/locking/rwsem.c:1263 [inline]
down_read+0x124/0x330 kernel/locking/rwsem.c:1528
kernfs_dop_revalidate+0xf0/0x5a0 fs/kernfs/dir.c:1159
d_revalidate fs/namei.c:868 [inline]
d_revalidate fs/namei.c:865 [inline]
lookup_fast+0x239/0x540 fs/namei.c:1679
walk_component+0x5b/0x5b0 fs/namei.c:2035
link_path_walk.part.0.constprop.0+0x669/0xd40 fs/namei.c:2404
link_path_walk fs/namei.c:2336 [inline]
path_openat+0x238/0x2d20 fs/namei.c:3882
do_filp_open+0x1dc/0x430 fs/namei.c:3913
do_sys_openat2+0x17a/0x1e0 fs/open.c:1416
do_sys_open fs/open.c:1431 [inline]
__do_sys_openat fs/open.c:1447 [inline]
__se_sys_openat fs/open.c:1442 [inline]
__x64_sys_openat+0x175/0x210 fs/open.c:1442
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3d8c2492f1
RSP: 002b:00007fff3da7f7f0 EFLAGS: 00000287
ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00000000000001fa RCX: 00007f3d8c2492f1
RDX: 0000000000090800 RSI: 00007f3d8c2b7e04 RDI: 00000000ffffff9c
RBP: 00007fff3da7f88c R08: 0000000000015db4 R09: 00007f3d8cf25080
R10: 0000000000000000 R11: 0000000000000287 R12: 0000000000000000
R13: 0000000000070f03 R14: 0000000000070f03 R15: 00007fff3da7f8e0
Showing all locks held in the system:
3 locks held by kworker/1:0/24:
1 lock held by khungtaskd/30:
#0: ffffffff88cb68a0
(
rcu_read_lock
){....}-{1:2}
, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6620
5 locks held by kworker/0:2/2075:
2 locks held by getty/2605:
#0:
ffff88810e7c40a0
(&tty->ldisc_sem){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1:
ffffc900000432f0
(
&ldata->atomic_read_lock
){+.+.}-{3:3}
, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/2647:
#0: ffffffff88cc2038
(
rcu_state.exp_mutex
){+.+.}-{3:3}
, at: exp_funnel_lock+0x282/0x3b0 kernel/rcu/tree_exp.h:296
1 lock held by syz-executor/2654:
#0: ffffffff88cc2038
(
rcu_state.exp_mutex
){+.+.}-{3:3}
, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:328
5 locks held by kworker/0:4/4923:
3 locks held by kworker/0:5/4926:
4 locks held by udevd/4936:
#0:
ffff888104725e80
(
&p->lock
){+.+.}-{3:3}
, at: seq_read_iter+0xde/0x12c0 fs/seq_file.c:182
#1: ffff8881043bf088
(
&of->mutex
#2
){+.+.}-{3:3}
, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2:
ffff888105b6d3c8
(
kn->active
#5
){++++}-{0:0}
, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3:
ffff888108f0b190
(
&dev->mutex
){....}-{3:3}
, at: device_lock include/linux/device.h:1009 [inline]
, at: uevent_show+0x188/0x3b0 drivers/base/core.c:2743
3 locks held by kworker/0:6/5079:
1 lock held by udevd/7900:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc1-syzkaller-00033-g25f51b76f90f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
watchdog+0xf4e/0x1280 kernel/hung_task.c:379
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
gspca_pac7302 1-1:0.0: URB error -71, resubmitting
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5079 Comm: kworker/0:6 Not tainted 6.11.0-rc1-syzkaller-00033-g25f51b76f90f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Workqueue: usb_hub_wq hub_event
RIP: 0010:io_serial_in+0x87/0xb0 drivers/tty/serial/8250/8250_port.c:407
Code: d8 ba fe 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 1a 66 03 5d 40 89 da ec <5b> 0f b6 c0 5d 41 5c c3 cc cc cc cc e8 08 c9 0f ff eb a2 e8 91 c9
RSP: 0018:ffffc900000076e0 EFLAGS: 00000002
RAX: dffffc0000000060 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: ffffffff82988c40 RDI: ffffffff8dfc8700
RBP: ffffffff8dfc86c0 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000020 R14: fffffbfff1bf9132 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8881f6200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f00de432000 CR3: 000000011dde6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
serial_in drivers/tty/serial/8250/8250.h:137 [inline]
serial_lsr_in drivers/tty/serial/8250/8250.h:159 [inline]
wait_for_lsr+0xda/0x180 drivers/tty/serial/8250/8250_port.c:2068
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3315 [inline]
serial8250_console_write+0xca3/0x1090 drivers/tty/serial/8250/8250_port.c:3393
console_emit_next_record kernel/printk/printk.c:2983 [inline]
console_flush_all+0x53c/0xd70 kernel/printk/printk.c:3049
console_unlock+0xae/0x290 kernel/printk/printk.c:3118
vprintk_emit kernel/printk/printk.c:2348 [inline]
vprintk_emit+0x11a/0x5a0 kernel/printk/printk.c:2303
vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
_printk+0xc8/0x100 kernel/printk/printk.c:2373
int_irq+0x1b7/0x270 drivers/media/usb/gspca/gspca.c:104
__usb_hcd_giveback_urb+0x466/0x6e0 drivers/usb/core/hcd.c:1650
usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1734
dummy_timer+0x17c3/0x38d0 drivers/usb/gadget/udc/dummy_hcd.c:1987
__run_hrtimer kernel/time/hrtimer.c:1689 [inline]
__hrtimer_run_queues+0x20c/0xcc0 kernel/time/hrtimer.c:1753
hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1815
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
__sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1049
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0x8b/0xb0 arch/x86/kernel/apic/apic.c:1043
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_release+0x4/0x6f0 kernel/locking/lockdep.c:5767
Code: 54 6d 32 8a e8 fd d6 76 00 e9 cb fe ff ff 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <48> b8 00 00 00 00 00 fc ff df 41 57 41 56 41 55 41 54 49 89 fc 55
RSP: 0018:ffffc900042b72a8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff88eb16e0 RCX: 0000000000000000
RDX: 1ffff11020e62e31 RSI: ffffffff81d3e58a RDI: ffffffff88eb1748
RBP: 1ffff92000856e5b R08: 0000000000000000 R09: fffffbfff1464bfb
R10: ffffc900042b73b0 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffffc900042b7338
__mutex_unlock_slowpath+0xa3/0x650 kernel/locking/mutex.c:912
__kernfs_iattrs fs/kernfs/inode.c:54 [inline]
kernfs_iattrs_noalloc fs/kernfs/inode.c:65 [inline]
kernfs_xattr_get+0x5a/0xa0 fs/kernfs/inode.c:298
selinux_kernfs_init_security+0x11a/0x4d0 security/selinux/hooks.c:3560
security_kernfs_init_security+0x6d/0xc0 security/security.c:2698
__kernfs_new_node+0x564/0x890 fs/kernfs/dir.c:663
kernfs_new_node+0x186/0x240 fs/kernfs/dir.c:700
__kernfs_create_file+0x53/0x350 fs/kernfs/file.c:1034
sysfs_add_file_mode_ns+0x1ff/0x3b0 fs/sysfs/file.c:307
create_files fs/sysfs/group.c:76 [inline]
internal_create_group+0x565/0xe50 fs/sysfs/group.c:180
internal_create_groups+0x9d/0x150 fs/sysfs/group.c:220
device_add_groups drivers/base/core.c:2826 [inline]
device_add_attrs drivers/base/core.c:2901 [inline]
device_add+0x781/0x1a70 drivers/base/core.c:3633
usb_create_ep_devs+0x160/0x2b0 drivers/usb/core/endpoint.c:169
usb_new_device+0x104a/0x1a10 drivers/usb/core/hub.c:2681
hub_port_connect drivers/usb/core/hub.c:5521 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5661 [inline]
port_event drivers/usb/core/hub.c:5821 [inline]
hub_event+0x2e66/0x4f50 drivers/usb/core/hub.c:5903
process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xf20 kernel/workqueue.c:3390
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244