syzbot


INFO: task hung in rfkill_unregister (2)

Status: auto-closed as invalid on 2022/08/27 03:13
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 242d, last: 188d
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in rfkill_unregister 2 367d 369d 0/24 auto-closed as invalid on 2022/01/29 14:25
linux-4.14 INFO: task hung in rfkill_unregister 1 930d 930d 0/1 auto-closed as invalid on 2020/09/13 12:44

Sample crash report:
INFO: task kworker/1:4:2934 blocked for more than 143 seconds.
      Not tainted 5.18.0-syzkaller-10643-g9d004b2f4fea #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:4     state:D stack:23216 pid: 2934 ppid:     2 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5116 [inline]
 __schedule+0xa00/0x4b30 kernel/sched/core.c:6431
 schedule+0xd2/0x1f0 kernel/sched/core.c:6503
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6562
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0xa70/0x1350 kernel/locking/mutex.c:747
 rfkill_unregister+0xda/0x2c0 net/rfkill/core.c:1130
 nfc_unregister_device+0x9c/0x340 net/nfc/core.c:1167
 nfcmrvl_nci_unregister_dev+0x38/0x180 drivers/nfc/nfcmrvl/main.c:186
 nfcmrvl_disconnect.cold+0x66/0xca drivers/nfc/nfcmrvl/usb.c:354
 usb_unbind_interface+0x1d8/0x8e0 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:532 [inline]
 device_remove+0x11f/0x170 drivers/base/dd.c:524
 __device_release_driver drivers/base/dd.c:1200 [inline]
 device_release_driver_internal+0x4a3/0x680 drivers/base/dd.c:1223
 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:529
 device_del+0x4f3/0xc80 drivers/base/core.c:3589
 usb_disable_device+0x35b/0x7b0 drivers/usb/core/message.c:1419
 usb_disconnect.cold+0x278/0x6ec drivers/usb/core/hub.c:2228
 hub_port_connect drivers/usb/core/hub.c:5207 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5507 [inline]
 port_event drivers/usb/core/hub.c:5665 [inline]
 hub_event+0x1e74/0x4680 drivers/usb/core/hub.c:5747
 process_one_work+0x996/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
 </TASK>
INFO: task kworker/0:9:4936 blocked for more than 143 seconds.
      Not tainted 5.18.0-syzkaller-10643-g9d004b2f4fea #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:9     state:D stack:24640 pid: 4936 ppid:     2 flags:0x00004000
Workqueue: events rfkill_global_led_trigger_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5116 [inline]
 __schedule+0xa00/0x4b30 kernel/sched/core.c:6431
 schedule+0xd2/0x1f0 kernel/sched/core.c:6503
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6562
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0xa70/0x1350 kernel/locking/mutex.c:747
 rfkill_global_led_trigger_worker+0x17/0x110 net/rfkill/core.c:181
 process_one_work+0x996/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
 </TASK>
INFO: task syz-executor.0:5538 blocked for more than 143 seconds.
      Not tainted 5.18.0-syzkaller-10643-g9d004b2f4fea #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:26056 pid: 5538 ppid:  3654 flags:0x00004004
Call Trace:
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5116 [inline]
 __schedule+0xa00/0x4b30 kernel/sched/core.c:6431
 schedule+0xd2/0x1f0 kernel/sched/core.c:6503
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6562
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0xa70/0x1350 kernel/locking/mutex.c:747
 device_lock include/linux/device.h:762 [inline]
 nfc_dev_down+0x2e/0x2e0 net/nfc/core.c:143
 nfc_rfkill_set_block+0x34/0xd0 net/nfc/core.c:179
 rfkill_set_block+0x1f9/0x540 net/rfkill/core.c:345
 rfkill_fop_write+0x2c3/0x570 net/rfkill/core.c:1286
 vfs_write+0x269/0xac0 fs/read_write.c:589
 ksys_write+0x1e8/0x250 fs/read_write.c:644
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f0944089109
RSP: 002b:00007f09452c5168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f094419bf60 RCX: 00007f0944089109
RDX: 0000000000000008 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 00007f09440e308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f09446cfb1f R14: 00007f09452c5300 R15: 0000000000022000
 </TASK>

Showing all locks held in the system:
2 locks held by pr/ttyS0/16:
1 lock held by khungtaskd/29:
 #0: ffffffff8bd86860 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6491
7 locks held by kworker/1:4/2934:
 #0: ffff888016d10138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888016d10138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff888016d10138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
 #0: ffff888016d10138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline]
 #0: ffff888016d10138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
 #0: ffff888016d10138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260
 #1: ffffc9000d787da8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264
 #2: ffff888148c63190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:762 [inline]
 #2: ffff888148c63190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c1/0x4680 drivers/usb/core/hub.c:5693
 #3: ffff88823bcec190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:762 [inline]
 #3: ffff88823bcec190 (&dev->mutex){....}-{3:3}, at: usb_disconnect.cold+0x43/0x6ec drivers/usb/core/hub.c:2219
 #4: ffff888046d9a118 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:762 [inline]
 #4: ffff888046d9a118 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1033 [inline]
 #4: ffff888046d9a118 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa0/0x680 drivers/base/dd.c:1220
 #5: ffff888046d9f100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:762 [inline]
 #5: ffff888046d9f100 (&dev->mutex){....}-{3:3}, at: nfc_unregister_device+0x68/0x340 net/nfc/core.c:1165
 #6: ffffffff8d996828 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_unregister+0xda/0x2c0 net/rfkill/core.c:1130
2 locks held by getty/3281:
 #0: ffff88814ba4f098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244
 #1: ffffc90002cd62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcea/0x1230 drivers/tty/n_tty.c:2075
3 locks held by kworker/0:9/4936:
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
 #0: ffff888010c64d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260
 #1: ffffc90002f9fda8 ((work_completion)(&rfkill_global_led_trigger_work)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264
 #2: ffffffff8d996828 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_global_led_trigger_worker+0x17/0x110 net/rfkill/core.c:181
2 locks held by syz-executor.0/5538:
 #0: ffffffff8d996828 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0x15c/0x570 net/rfkill/core.c:1278
 #1: ffff888046d9f100 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:762 [inline]
 #1: ffff888046d9f100 (&dev->mutex){....}-{3:3}, at: nfc_dev_down+0x2e/0x2e0 net/nfc/core.c:143

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 5.18.0-syzkaller-10643-g9d004b2f4fea #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
 watchdog+0xc22/0xf90 kernel/hung_task.c:378
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 16 Comm: pr/ttyS0 Not tainted 5.18.0-syzkaller-10643-g9d004b2f4fea #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:io_serial_in+0x83/0xa0 drivers/tty/serial/8250/8250_port.c:461
Code: 53 1a fd 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 16 66 03 5d 40 89 da ec <5b> 0f b6 c0 5d 41 5c c3 e8 20 10 67 fd eb a6 e8 49 10 67 fd eb e3
RSP: 0018:ffffc90000157ac0 EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: ffffffff84601dcc RDI: ffffffff908cd3a0
RBP: ffffffff908cd360 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: fffffbfff2119abf R14: fffffbfff2119a76 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d851178918 CR3: 00000000240e0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 serial_in drivers/tty/serial/8250/8250.h:115 [inline]
 wait_for_xmitr+0x9a/0x210 drivers/tty/serial/8250/8250_port.c:2089
 serial8250_console_putchar+0x1d/0x60 drivers/tty/serial/8250/8250_port.c:3310
 uart_console_write+0xb1/0x100 drivers/tty/serial/serial_core.c:1934
 serial8250_console_write+0xa57/0xc30 drivers/tty/serial/8250/8250_port.c:3382
 call_console_driver kernel/printk/printk.c:2075 [inline]
 __console_emit_next_record+0x896/0xa60 kernel/printk/printk.c:2916
 console_emit_next_record kernel/printk/printk.c:3721 [inline]
 printk_kthread_func.cold+0x702/0x73d kernel/printk/printk.c:3837
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
 </TASK>
----------------
Code disassembly (best guess):
   0:	53                   	push   %rbx
   1:	1a fd                	sbb    %ch,%bh
   3:	48 8d 7d 40          	lea    0x40(%rbp),%rdi
   7:	44 89 e1             	mov    %r12d,%ecx
   a:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  11:	fc ff df
  14:	48 89 fa             	mov    %rdi,%rdx
  17:	d3 e3                	shl    %cl,%ebx
  19:	48 c1 ea 03          	shr    $0x3,%rdx
  1d:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
  21:	75 16                	jne    0x39
  23:	66 03 5d 40          	add    0x40(%rbp),%bx
  27:	89 da                	mov    %ebx,%edx
  29:	ec                   	in     (%dx),%al
* 2a:	5b                   	pop    %rbx <-- trapping instruction
  2b:	0f b6 c0             	movzbl %al,%eax
  2e:	5d                   	pop    %rbp
  2f:	41 5c                	pop    %r12
  31:	c3                   	retq
  32:	e8 20 10 67 fd       	callq  0xfd671057
  37:	eb a6                	jmp    0xffffffdf
  39:	e8 49 10 67 fd       	callq  0xfd671087
  3e:	eb e3                	jmp    0x23

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce 2022/05/29 03:07 upstream 9d004b2f4fea a46af346 .config log report info INFO: task hung in rfkill_unregister
ci-upstream-kasan-gce-386 2022/04/04 16:22 upstream 312310928417 5915c2cb .config log report info INFO: task hung in rfkill_unregister
* Struck through repros no longer work on HEAD.