INFO: task syz.4.14371:586 blocked for more than 430 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.14371     state:D stack:0     pid:586   tgid:585   ppid:31890  task_flags:0x400040 flags:0x00000001
Call trace: 
[<81b1b7bc>] (__schedule) from [<802966c8>] (__schedule_loop kernel/sched/core.c:7268 [inline])
[<81b1b7bc>] (__schedule) from [<802966c8>] (rt_mutex_schedule+0x20/0x38 kernel/sched/core.c:7564)
 r10:00000000 r9:851dbe80 r8:ecac9de0 r7:ecac9de8 r6:851dbe80 r5:851aa580
 r4:851aa580
[<802966a8>] (rt_mutex_schedule) from [<81b22dbc>] (rt_mutex_slowlock_block.constprop.0+0x16c/0x1e4 kernel/locking/rtmutex.c:1662)
 r5:851aa580 r4:830bd054
[<81b22c50>] (rt_mutex_slowlock_block.constprop.0) from [<81b241f4>] (__rt_mutex_slowlock kernel/locking/rtmutex.c:1739 [inline])
[<81b22c50>] (rt_mutex_slowlock_block.constprop.0) from [<81b241f4>] (__rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1779 [inline])
[<81b22c50>] (rt_mutex_slowlock_block.constprop.0) from [<81b241f4>] (rt_mutex_slowlock.constprop.0+0xcc/0x3d0 kernel/locking/rtmutex.c:1819)
 r10:86cfc800 r9:60000013 r8:ecac9de8 r7:ecac9de0 r6:00000002 r5:830bd054
 r4:851aa580
[<81b24128>] (rt_mutex_slowlock.constprop.0) from [<81b245dc>] (__rt_mutex_lock kernel/locking/rtmutex.c:1834 [inline])
[<81b24128>] (rt_mutex_slowlock.constprop.0) from [<81b245dc>] (__rt_mutex_lock_common kernel/locking/rtmutex_api.c:49 [inline])
[<81b24128>] (rt_mutex_slowlock.constprop.0) from [<81b245dc>] (rt_mutex_lock+0x44/0x48 kernel/locking/rtmutex_api.c:89)
 r10:86cfc800 r9:00000001 r8:8982f040 r7:8987e400 r6:8982f040 r5:00000001
 r4:830bd040
[<81b24598>] (rt_mutex_lock) from [<81164c04>] (i2c_adapter_lock_bus+0x14/0x18 drivers/i2c/i2c-core-base.c:848)
[<81164bf0>] (i2c_adapter_lock_bus) from [<81166bf8>] (i2c_lock_bus include/linux/i2c.h:809 [inline])
[<81164bf0>] (i2c_adapter_lock_bus) from [<81166bf8>] (__i2c_lock_bus_helper drivers/i2c/i2c-core.h:46 [inline])
[<81164bf0>] (i2c_adapter_lock_bus) from [<81166bf8>] (i2c_transfer+0xc8/0x108 drivers/i2c/i2c-core-base.c:2312)
[<81166b30>] (i2c_transfer) from [<8116c43c>] (i2cdev_ioctl_rdwr+0x140/0x238 drivers/i2c/i2c-dev.c:306)
 r6:00000001 r5:0000000c r4:8982f04c
[<8116c2fc>] (i2cdev_ioctl_rdwr) from [<8116ccb8>] (i2cdev_ioctl+0x28c/0x3b4 drivers/i2c/i2c-dev.c:467)
 r10:851aa580 r9:00000005 r8:86b66d00 r7:20000000 r6:86cfc800 r5:8982f040
 r4:20000000
[<8116ca2c>] (i2cdev_ioctl) from [<805a1e5c>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<8116ca2c>] (i2cdev_ioctl) from [<805a1e5c>] (do_vfs_ioctl fs/ioctl.c:551 [inline])
[<8116ca2c>] (i2cdev_ioctl) from [<805a1e5c>] (__do_sys_ioctl fs/ioctl.c:595 [inline])
[<8116ca2c>] (i2cdev_ioctl) from [<805a1e5c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583)
 r7:20000000 r6:00000707 r5:86b66d01 r4:00000000
[<805a1c18>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xecac9fa8 to 0xecac9ff0)
9fa0:                   00000000 00000000 00000005 00000707 20000000 00000000
9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f480dc
9fe0: 76f47e88 76f47e78 00018ebc 00130810
 r10:00000036 r9:851aa580 r8:8020029c r7:00000036 r6:00346310 r5:00000000
 r4:00000000
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 29 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: ARM-Versatile Express
Call trace: 
[<80201a14>] (dump_backtrace) from [<80201b08>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:60080093 r6:60080093 r5:8231eb0c r4:00000000
[<80201af0>] (show_stack) from [<8021e384>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201af0>] (show_stack) from [<8021e384>] (dump_stack_lvl+0x5c/0x70 lib/dump_stack.c:120)
[<8021e328>] (dump_stack_lvl) from [<8021e3b0>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r7:00000000 r6:00080013 r5:00000001 r4:00000001
[<8021e398>] (dump_stack) from [<81b05094>] (nmi_cpu_backtrace+0x150/0x170 lib/nmi_backtrace.c:113)
[<81b04f44>] (nmi_cpu_backtrace) from [<81b051e4>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62)
 r7:00000001 r6:82a0b550 r5:82a1a2b8 r4:ffffffff
[<81b050b4>] (nmi_trigger_cpumask_backtrace) from [<8022f104>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:852)
 r9:82a0b6d8 r8:00000048 r7:0000000a r6:82a03d80 r5:00007ef3 r4:00000048
[<8022f0ec>] (arch_trigger_cpumask_backtrace) from [<81b0cd30>] (trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline])
[<8022f0ec>] (arch_trigger_cpumask_backtrace) from [<81b0cd30>] (__sys_info lib/sys_info.c:157 [inline])
[<8022f0ec>] (arch_trigger_cpumask_backtrace) from [<81b0cd30>] (sys_info+0x68/0xa8 lib/sys_info.c:165)
[<81b0ccc8>] (sys_info) from [<8038acd4>] (check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline])
[<81b0ccc8>] (sys_info) from [<8038acd4>] (watchdog+0x3ac/0x858 kernel/hung_task.c:561)
 r5:00007ef3 r4:00000001
[<8038a928>] (watchdog) from [<80281550>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:df819e58 r8:83113580 r7:00000000 r6:8038a928 r5:83178000
 r4:838868c0
[<80281434>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdf8d5fb0 to 0xdf8d5ff8)
5fa0:                                     00000000 00000000 00000000 00000000
5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80281434 r4:838868c0
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 2825 Comm: pr/ttyAMA-1 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: ARM-Versatile Express
PC is at __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
PC is at _raw_spin_unlock_irqrestore+0x28/0x54 kernel/locking/spinlock.c:198
LR is at spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
LR is at __uart_port_unlock_irqrestore include/linux/serial_core.h:616 [inline]
LR is at pl011_console_device_unlock+0x20/0x24 drivers/tty/serial/amba-pl011.c:2668
pc : [<81b26078>]    lr : [<80ae8f4c>]    psr: 60000113
sp : eb411ec8  ip : eb411ed8  fp : eb411ed4
r10: 82b59724  r9 : 00000000  r8 : 00000000
r7 : 00000117  r6 : 82b59688  r5 : 00000000  r4 : 00000001
r3 : 000098c1  r2 : 00000000  r1 : 60000113  r0 : 850c1040
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 87183700  DAC: fffffffd
Call trace: 
[<81b26050>] (_raw_spin_unlock_irqrestore) from [<80ae8f4c>] (spin_unlock_irqrestore include/linux/spinlock.h:408 [inline])
[<81b26050>] (_raw_spin_unlock_irqrestore) from [<80ae8f4c>] (__uart_port_unlock_irqrestore include/linux/serial_core.h:616 [inline])
[<81b26050>] (_raw_spin_unlock_irqrestore) from [<80ae8f4c>] (pl011_console_device_unlock+0x20/0x24 drivers/tty/serial/amba-pl011.c:2668)
[<80ae8f2c>] (pl011_console_device_unlock) from [<802e8ae8>] (nbcon_emit_one+0x88/0x100 kernel/printk/nbcon.c:1165)
[<802e8a60>] (nbcon_emit_one) from [<802e8d68>] (nbcon_kthread_func+0x208/0x2ec kernel/printk/nbcon.c:1271)
 r6:82cc02d4 r5:82b59688 r4:84679900
[<802e8b60>] (nbcon_kthread_func) from [<80281550>] (kthread+0x11c/0x154 kernel/kthread.c:436)
 r10:00000000 r9:e03d1b38 r8:8484bb80 r7:82b59688 r6:802e8b60 r5:84679900
 r4:838b2840
[<80281434>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xeb411fb0 to 0xeb411ff8)
1fa0:                                     00000000 00000000 00000000 00000000
1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80281434 r4:838b2840