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Date: Fri, 29 Jul 2022 21:24:13 +0200
From: Greg Tulli <greg.iforce@...il.com>
To: Randy Dunlap <rdunlap@...radead.org>
Cc: linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Subject: Re: [Question] iforce_serio lockup
I was advised to use a vanilla kernel with CONFIG_PROVE_LOCKING and
decode the symbols in the report. So I followed
https://kernelnewbies.org/OutreachyfirstpatchSetup and here's the
result. Thanks, Tetsuo Handa.
WARNING: possible circular locking dependency detected
5.19.0-rc6iforce-00194-gf3a76018dd55 #2 Not tainted
------------------------------------------------------
kworker/1:4/392 is trying to acquire lock:
ffff8e358419e030 (&iforce->xmit_lock){-...}-{2:2}, at:
iforce_serio_xmit (drivers/input/joystick/iforce/iforce-serio.c:38)
iforce_serio
but task is already holding lock:
ffff8e3586c6dec8 (&serport->lock){-...}-{2:2}, at:
serport_ldisc_write_wakeup (drivers/input/serio/serport.c:263) serport
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&serport->lock){-...}-{2:2}:
_raw_spin_lock_irqsave (./include/linux/spinlock_api_smp.h:111
kernel/locking/spinlock.c:162)
serport_ldisc_write_wakeup (drivers/input/serio/serport.c:263) serport
tty_wakeup (drivers/tty/tty_io.c:531)
tty_port_default_wakeup (drivers/tty/tty_port.c:52)
tty_port_tty_wakeup (drivers/tty/tty_port.c:415)
uart_write_wakeup (drivers/tty/serial/serial_core.c:113 (discriminator 2))
serial8250_tx_chars (drivers/tty/serial/8250/8250_port.c:1864)
serial8250_handle_irq.part.0 (./include/linux/serial_core.h:531
drivers/tty/serial/8250/8250_port.c:1956)
serial8250_default_handle_irq
(drivers/tty/serial/8250/8250_port.c:1924
drivers/tty/serial/8250/8250_port.c:1971)
serial8250_interrupt (drivers/tty/serial/8250/8250_core.c:125)
__handle_irq_event_percpu (kernel/irq/handle.c:158)
handle_irq_event_percpu (kernel/irq/handle.c:195)
handle_irq_event (kernel/irq/handle.c:212)
handle_edge_irq (kernel/irq/chip.c:820)
__common_interrupt (./include/asm-generic/irq_regs.h:28 (discriminator
22) arch/x86/kernel/irq.c:263 (discriminator 22))
common_interrupt (arch/x86/kernel/irq.c:240 (discriminator 14))
asm_common_interrupt (./arch/x86/include/asm/idtentry.h:640)
__cond_resched (kernel/sched/core.c:8228)
iforce_init_device (drivers/input/joystick/iforce/iforce.h:118
drivers/input/joystick/iforce/iforce-main.c:261) iforce
iforce_serio_connect
(drivers/input/joystick/iforce/iforce-serio.c:207) iforce_serio
serio_connect_driver (drivers/input/serio/serio.c:48)
serio_driver_probe (drivers/input/serio/serio.c:779)
really_probe (drivers/base/dd.c:555 drivers/base/dd.c:634
drivers/base/dd.c:579)
__driver_probe_device (drivers/base/dd.c:764)
driver_probe_device (drivers/base/dd.c:794)
__driver_attach (drivers/base/dd.c:1164)
bus_for_each_dev (drivers/base/bus.c:301)
driver_attach (drivers/base/dd.c:1181)
serio_handle_event (drivers/input/serio/serio.c:808
drivers/input/serio/serio.c:227)
process_one_work (./arch/x86/include/asm/jump_label.h:27
./include/linux/jump_label.h:207
./include/trace/events/workqueue.h:108 kernel/workqueue.c:2294)
worker_thread (./include/linux/list.h:292 kernel/workqueue.c:2437)
kthread (kernel/kthread.c:376)
ret_from_fork (arch/x86/entry/entry_64.S:308)
-> #1 (&port_lock_key){-...}-{2:2}:
_raw_spin_lock_irqsave (./include/linux/spinlock_api_smp.h:111
kernel/locking/spinlock.c:162)
uart_write (drivers/tty/serial/serial_core.c:577 (discriminator 1))
serport_serio_write (drivers/input/serio/serport.c:48) serport
iforce_serio_xmit (drivers/input/joystick/iforce/iforce-serio.c:51) iforce_serio
iforce_send_packet (drivers/input/joystick/iforce/iforce-packets.c:84) iforce
iforce_serio_get_id (./include/linux/kernel.h:110
drivers/input/joystick/iforce/iforce-serio.c:84) iforce_serio
iforce_init_device (drivers/input/joystick/iforce/iforce.h:118
drivers/input/joystick/iforce/iforce-main.c:261) iforce
iforce_serio_connect
(drivers/input/joystick/iforce/iforce-serio.c:207) iforce_serio
serio_connect_driver (drivers/input/serio/serio.c:48)
serio_driver_probe (drivers/input/serio/serio.c:779)
really_probe (drivers/base/dd.c:555 drivers/base/dd.c:634
drivers/base/dd.c:579)
__driver_probe_device (drivers/base/dd.c:764)
driver_probe_device (drivers/base/dd.c:794)
__driver_attach (drivers/base/dd.c:1164)
bus_for_each_dev (drivers/base/bus.c:301)
driver_attach (drivers/base/dd.c:1181)
serio_handle_event (drivers/input/serio/serio.c:808
drivers/input/serio/serio.c:227)
process_one_work (./arch/x86/include/asm/jump_label.h:27
./include/linux/jump_label.h:207
./include/trace/events/workqueue.h:108 kernel/workqueue.c:2294)
worker_thread (./include/linux/list.h:292 kernel/workqueue.c:2437)
kthread (kernel/kthread.c:376)
ret_from_fork (arch/x86/entry/entry_64.S:308)
-> #0 (&iforce->xmit_lock){-...}-{2:2}:
__lock_acquire (kernel/locking/lockdep.c:3096
kernel/locking/lockdep.c:3214 kernel/locking/lockdep.c:3829
kernel/locking/lockdep.c:5053)
lock_acquire (kernel/locking/lockdep.c:466
kernel/locking/lockdep.c:5667 kernel/locking/lockdep.c:5630)
_raw_spin_lock_irqsave (./include/linux/spinlock_api_smp.h:111
kernel/locking/spinlock.c:162)
iforce_serio_xmit (drivers/input/joystick/iforce/iforce-serio.c:38) iforce_serio
iforce_serio_write_wakeup
(drivers/input/joystick/iforce/iforce-serio.c:125) iforce_serio
serport_ldisc_write_wakeup (./include/linux/serio.h:133
drivers/input/serio/serport.c:265) serport
tty_wakeup (drivers/tty/tty_io.c:531)
tty_port_default_wakeup (drivers/tty/tty_port.c:52)
tty_port_tty_wakeup (drivers/tty/tty_port.c:415)
uart_write_wakeup (drivers/tty/serial/serial_core.c:113 (discriminator 2))
serial8250_tx_chars (drivers/tty/serial/8250/8250_port.c:1864)
serial8250_handle_irq.part.0 (./include/linux/serial_core.h:531
drivers/tty/serial/8250/8250_port.c:1956)
serial8250_default_handle_irq
(drivers/tty/serial/8250/8250_port.c:1924
drivers/tty/serial/8250/8250_port.c:1971)
serial8250_interrupt (drivers/tty/serial/8250/8250_core.c:125)
__handle_irq_event_percpu (kernel/irq/handle.c:158)
handle_irq_event_percpu (kernel/irq/handle.c:195)
handle_irq_event (kernel/irq/handle.c:212)
handle_edge_irq (kernel/irq/chip.c:820)
__common_interrupt (./include/asm-generic/irq_regs.h:28 (discriminator
22) arch/x86/kernel/irq.c:263 (discriminator 22))
common_interrupt (arch/x86/kernel/irq.c:240 (discriminator 14))
asm_common_interrupt (./arch/x86/include/asm/idtentry.h:640)
__cond_resched (kernel/sched/core.c:8228)
iforce_init_device (drivers/input/joystick/iforce/iforce.h:118
drivers/input/joystick/iforce/iforce-main.c:261) iforce
iforce_serio_connect
(drivers/input/joystick/iforce/iforce-serio.c:207) iforce_serio
serio_connect_driver (drivers/input/serio/serio.c:48)
serio_driver_probe (drivers/input/serio/serio.c:779)
really_probe (drivers/base/dd.c:555 drivers/base/dd.c:634
drivers/base/dd.c:579)
__driver_probe_device (drivers/base/dd.c:764)
driver_probe_device (drivers/base/dd.c:794)
__driver_attach (drivers/base/dd.c:1164)
bus_for_each_dev (drivers/base/bus.c:301)
driver_attach (drivers/base/dd.c:1181)
serio_handle_event (drivers/input/serio/serio.c:808
drivers/input/serio/serio.c:227)
process_one_work (./arch/x86/include/asm/jump_label.h:27
./include/linux/jump_label.h:207
./include/trace/events/workqueue.h:108 kernel/workqueue.c:2294)
worker_thread (./include/linux/list.h:292 kernel/workqueue.c:2437)
kthread (kernel/kthread.c:376)
ret_from_fork (arch/x86/entry/entry_64.S:308)
other info that might help us debug this:
Chain exists of:
&iforce->xmit_lock --> &port_lock_key --> &serport->lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&serport->lock);
lock(&port_lock_key);
lock(&serport->lock);
lock(&iforce->xmit_lock);
*** DEADLOCK ***
9 locks held by kworker/1:4/392:
#0: ffff8e358104f548 ((wq_completion)events_long){+.+.}-{0:0}, at:
process_one_work (./arch/x86/include/asm/atomic64_64.h:34
./include/linux/atomic/atomic-long.h:41
./include/linux/atomic/atomic-instrumented.h:1280
kernel/workqueue.c:636 kernel/workqueue.c:663 kernel/workqueue.c:2260)
#1: ffffb437c0efbe48 (serio_event_work){+.+.}-{0:0}, at:
process_one_work (./arch/x86/include/asm/atomic64_64.h:34
./include/linux/atomic/atomic-long.h:41
./include/linux/atomic/atomic-instrumented.h:1280
kernel/workqueue.c:636 kernel/workqueue.c:663 kernel/workqueue.c:2260)
#2: ffffffffae31dd90 (serio_mutex){+.+.}-{3:3}, at: serio_handle_event
(drivers/input/serio/serio.c:155 drivers/input/serio/serio.c:205)
#3: ffff8e3599326308 (&dev->mutex){....}-{3:3}, at:
__device_driver_lock (drivers/base/dd.c:1055)
#4: ffff8e35993261e8 (&serio->drv_mutex){+.+.}-{3:3}, at:
serio_connect_driver (drivers/input/serio/serio.c:47)
#5: ffff8e359e3d5f30 (&i->lock){-...}-{2:2}, at: serial8250_interrupt
(drivers/tty/serial/8250/8250_core.c:117)
#6: ffffffffaf3c1fb8 (&port_lock_key){-...}-{2:2}, at:
serial8250_handle_irq.part.0 (./include/linux/serial_core.h:265
drivers/tty/serial/8250/8250_port.c:1929)
#7: ffff8e35833b48a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref
(drivers/tty/tty_ldisc.c:264)
#8: ffff8e3586c6dec8 (&serport->lock){-...}-{2:2}, at:
serport_ldisc_write_wakeup (drivers/input/serio/serport.c:263) serport
stack backtrace:
CPU: 1 PID: 392 Comm: kworker/1:4 Not tainted
5.19.0-rc6iforce-00194-gf3a76018dd55 #2
Hardware name: System manufacturer System Product Name/V-P5G41E, BIOS
0204 12/21/2009
Workqueue: events_long serio_handle_event
Call Trace:
<IRQ>
dump_stack_lvl (lib/dump_stack.c:107)
dump_stack (lib/dump_stack.c:114)
print_circular_bug.isra.0.cold (kernel/locking/lockdep.c:2053)
check_noncircular (kernel/locking/lockdep.c:2178)
__lock_acquire (kernel/locking/lockdep.c:3096
kernel/locking/lockdep.c:3214 kernel/locking/lockdep.c:3829
kernel/locking/lockdep.c:5053)
lock_acquire (kernel/locking/lockdep.c:466
kernel/locking/lockdep.c:5667 kernel/locking/lockdep.c:5630)
? iforce_serio_xmit (drivers/input/joystick/iforce/iforce-serio.c:38)
iforce_serio
? find_held_lock (kernel/locking/lockdep.c:5156)
_raw_spin_lock_irqsave (./include/linux/spinlock_api_smp.h:111
kernel/locking/spinlock.c:162)
? iforce_serio_xmit (drivers/input/joystick/iforce/iforce-serio.c:38)
iforce_serio
iforce_serio_xmit (drivers/input/joystick/iforce/iforce-serio.c:38) iforce_serio
iforce_serio_write_wakeup
(drivers/input/joystick/iforce/iforce-serio.c:125) iforce_serio
serport_ldisc_write_wakeup (./include/linux/serio.h:133
drivers/input/serio/serport.c:265) serport
tty_wakeup (drivers/tty/tty_io.c:531)
tty_port_default_wakeup (drivers/tty/tty_port.c:52)
tty_port_tty_wakeup (drivers/tty/tty_port.c:415)
uart_write_wakeup (drivers/tty/serial/serial_core.c:113 (discriminator 2))
serial8250_tx_chars (drivers/tty/serial/8250/8250_port.c:1864)
serial8250_handle_irq.part.0 (./include/linux/serial_core.h:531
drivers/tty/serial/8250/8250_port.c:1956)
serial8250_default_handle_irq
(drivers/tty/serial/8250/8250_port.c:1924
drivers/tty/serial/8250/8250_port.c:1971)
serial8250_interrupt (drivers/tty/serial/8250/8250_core.c:125)
__handle_irq_event_percpu (kernel/irq/handle.c:158)
handle_irq_event_percpu (kernel/irq/handle.c:195)
handle_irq_event (kernel/irq/handle.c:212)
handle_edge_irq (kernel/irq/chip.c:820)
__common_interrupt (./include/asm-generic/irq_regs.h:28 (discriminator
22) arch/x86/kernel/irq.c:263 (discriminator 22))
common_interrupt (arch/x86/kernel/irq.c:240 (discriminator 14))
</IRQ>
<TASK>
asm_common_interrupt (./arch/x86/include/asm/idtentry.h:640)
RIP: 0010:__cond_resched (kernel/sched/core.c:8228)
Code: 52 a9 ff ff ff 7f 74 01 c3 9c 58 f6 c4 02 74 f8 55 48 89 e5 e8
51 ff ff ff 5d c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <0f> 1f
44 00 00 65 8b 15 14 60 ab 52 85 d2 74 03 31 c0 c3 55 48 89
All code
========
0: 52 push %rdx
1: a9 ff ff ff 7f test $0x7fffffff,%eax
6: 74 01 je 0x9
8: c3 retq
9: 9c pushfq
a: 58 pop %rax
b: f6 c4 02 test $0x2,%ah
e: 74 f8 je 0x8
10: 55 push %rbp
11: 48 89 e5 mov %rsp,%rbp
14: e8 51 ff ff ff callq 0xffffffffffffff6a
19: 5d pop %rbp
1a: c3 retq
1b: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)
22: 00 00 00 00
26: 0f 1f 40 00 nopl 0x0(%rax)
2a:* 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) <-- trapping instruction
2f: 65 8b 15 14 60 ab 52 mov %gs:0x52ab6014(%rip),%edx # 0x52ab604a
36: 85 d2 test %edx,%edx
38: 74 03 je 0x3d
3a: 31 c0 xor %eax,%eax
3c: c3 retq
3d: 55 push %rbp
3e: 48 rex.W
3f: 89 .byte 0x89
Code starting with the faulting instruction
===========================================
0: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
5: 65 8b 15 14 60 ab 52 mov %gs:0x52ab6014(%rip),%edx # 0x52ab6020
c: 85 d2 test %edx,%edx
e: 74 03 je 0x13
10: 31 c0 xor %eax,%eax
12: c3 retq
13: 55 push %rbp
14: 48 rex.W
15: 89 .byte 0x89
RSP: 0018:ffffb437c0efbbb8 EFLAGS: 00000286
RAX: 0000000000000000 RBX: ffff8e358419e000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffffaddc1e7a RDI: 00000000ffffffff
RBP: ffffb437c0efbc20 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000253 R12: 0000000000000014
R13: ffffb437c0efbc48 R14: ffff8e35841c6000 R15: ffffb437c0efbc38
? iforce_serio_get_id
(drivers/input/joystick/iforce/iforce-serio.c:84) iforce_serio
? debug_mutex_init (kernel/locking/mutex-debug.c:89)
iforce_init_device (drivers/input/joystick/iforce/iforce.h:118
drivers/input/joystick/iforce/iforce-main.c:261) iforce
? serport_serio_open (drivers/input/serio/serport.c:60) serport
iforce_serio_connect
(drivers/input/joystick/iforce/iforce-serio.c:207) iforce_serio
serio_connect_driver (drivers/input/serio/serio.c:48)
serio_driver_probe (drivers/input/serio/serio.c:779)
really_probe (drivers/base/dd.c:555 drivers/base/dd.c:634
drivers/base/dd.c:579)
__driver_probe_device (drivers/base/dd.c:764)
driver_probe_device (drivers/base/dd.c:794)
__driver_attach (drivers/base/dd.c:1164)
? __device_attach_driver (drivers/base/dd.c:1116)
bus_for_each_dev (drivers/base/bus.c:301)
driver_attach (drivers/base/dd.c:1181)
serio_handle_event (drivers/input/serio/serio.c:808
drivers/input/serio/serio.c:227)
process_one_work (./arch/x86/include/asm/jump_label.h:27
./include/linux/jump_label.h:207
./include/trace/events/workqueue.h:108 kernel/workqueue.c:2294)
worker_thread (./include/linux/list.h:292 kernel/workqueue.c:2437)
? process_one_work (kernel/workqueue.c:2379)
kthread (kernel/kthread.c:376)
? kthread_complete_and_exit (kernel/kthread.c:331)
ret_from_fork (arch/x86/entry/entry_64.S:308)
</TASK>
2022-07-11 11:32 GMT+02:00, Greg T <greg.iforce@...il.com>:
> That problem vanishes if we don't call iforce_process_packet directly
> from iforce_serio_irq, but from a tasklet. Is that a right approach?
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