INFO: task syz-executor:10475 blocked for more than 430 seconds.
      Not tainted 6.11.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:0     pid:10475 tgid:10475 ppid:10474  flags:0x00000000
Call trace: 
[<8197ecc8>] (__schedule) from [<8197f860>] (__schedule_loop kernel/sched/core.c:6606 [inline])
[<8197ecc8>] (__schedule) from [<8197f860>] (schedule+0x2c/0xfc kernel/sched/core.c:6621)
 r10:84fa9e10 r9:00000000 r8:8277ab8c r7:00000002 r6:eb3f9dec r5:856aa400
 r4:856aa400
[<8197f834>] (schedule) from [<8197fc14>] (schedule_preempt_disabled+0x18/0x24 kernel/sched/core.c:6678)
 r5:856aa400 r4:8277ab88
[<8197fbfc>] (schedule_preempt_disabled) from [<819826ec>] (__mutex_lock_common kernel/locking/mutex.c:684 [inline])
[<8197fbfc>] (schedule_preempt_disabled) from [<819826ec>] (__mutex_lock.constprop.0+0x2e8/0xae0 kernel/locking/mutex.c:752)
[<81982404>] (__mutex_lock.constprop.0) from [<81982fb8>] (__mutex_lock_slowpath+0x14/0x18 kernel/locking/mutex.c:1040)
 r10:84fa9e10 r9:00000000 r8:00000000 r7:eb3f9f08 r6:84fa9e00 r5:00000001
 r4:8277ab88
[<81982fa4>] (__mutex_lock_slowpath) from [<81982ff8>] (mutex_lock+0x3c/0x40 kernel/locking/mutex.c:286)
[<81982fbc>] (mutex_lock) from [<80d714fc>] (del_device_store+0x60/0x188 drivers/net/netdevsim/bus.c:216)
[<80d7149c>] (del_device_store) from [<80a7aaa0>] (bus_attr_store+0x2c/0x38 drivers/base/bus.c:170)
 r5:00000001 r4:80d7149c
[<80a7aa74>] (bus_attr_store) from [<805c8cb8>] (sysfs_kf_write+0x40/0x4c fs/sysfs/file.c:136)
 r5:00000001 r4:80a7aa74
[<805c8c78>] (sysfs_kf_write) from [<805c7fb8>] (kernfs_fop_write_iter+0x114/0x200 fs/kernfs/file.c:334)
 r5:00000001 r4:85327880
[<805c7ea4>] (kernfs_fop_write_iter) from [<80507f54>] (new_sync_write fs/read_write.c:497 [inline])
[<805c7ea4>] (kernfs_fop_write_iter) from [<80507f54>] (vfs_write+0x274/0x44c fs/read_write.c:590)
 r10:81a22608 r9:7e81d168 r8:eb3f9f68 r7:856aa400 r6:00000001 r5:852263c0
 r4:805c7ea4
[<80507ce0>] (vfs_write) from [<805082b0>] (ksys_write+0x78/0xf8 fs/read_write.c:643)
 r10:00000004 r9:856aa400 r8:8020029c r7:00000000 r6:00000000 r5:852263c0
 r4:852263c0
[<80508238>] (ksys_write) from [<80508340>] (__do_sys_write fs/read_write.c:655 [inline])
[<80508238>] (ksys_write) from [<80508340>] (sys_write+0x10/0x14 fs/read_write.c:652)
 r7:00000004 r6:00000001 r5:00189350 r4:00000005
[<80508330>] (sys_write) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xeb3f9fa8 to 0xeb3f9ff0)
9fa0:                   00000005 00189350 00000005 7e81d168 00000001 00000001
9fc0: 00000005 00189350 00000001 00000004 00000002 0018909c 7e81d834 00000003
9fe0: 00000158 7e81d148 00013ab8 00130d30
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 32 Comm: khungtaskd Not tainted 6.11.0-rc6-syzkaller #0
Hardware name: ARM-Versatile Express
Call trace: 
[<8195d0e0>] (dump_backtrace) from [<8195d1dc>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:00000000 r6:00000013 r5:60000093 r4:8200ca8c
[<8195d1c4>] (show_stack) from [<8197af1c>] (__dump_stack lib/dump_stack.c:93 [inline])
[<8195d1c4>] (show_stack) from [<8197af1c>] (dump_stack_lvl+0x70/0x7c lib/dump_stack.c:119)
[<8197aeac>] (dump_stack_lvl) from [<8197af40>] (dump_stack+0x18/0x1c lib/dump_stack.c:128)
 r5:00000001 r4:00000001
[<8197af28>] (dump_stack) from [<8194a3d0>] (nmi_cpu_backtrace+0x160/0x17c lib/nmi_backtrace.c:113)
[<8194a270>] (nmi_cpu_backtrace) from [<8194a51c>] (nmi_trigger_cpumask_backtrace+0x130/0x1d8 lib/nmi_backtrace.c:62)
 r7:00000001 r6:8260c5d0 r5:8261a88c r4:ffffffff
[<8194a3ec>] (nmi_trigger_cpumask_backtrace) from [<802103c8>] (arch_trigger_cpumask_backtrace+0x18/0x1c arch/arm/kernel/smp.c:851)
 r9:00013c0f r8:828b3130 r7:8260c734 r6:00007e3f r5:8261ae48 r4:85e71a1c
[<802103b0>] (arch_trigger_cpumask_backtrace) from [<80350e30>] (trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline])
[<802103b0>] (arch_trigger_cpumask_backtrace) from [<80350e30>] (check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline])
[<802103b0>] (arch_trigger_cpumask_backtrace) from [<80350e30>] (watchdog+0x498/0x5b8 kernel/hung_task.c:379)
[<80350998>] (watchdog) from [<8026fb04>] (kthread+0x104/0x134 kernel/kthread.c:389)
 r10:00000000 r9:df819e58 r8:82e9e240 r7:00000000 r6:80350998 r5:82ee0c00
 r4:82f3a040
[<8026fa00>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdf8e1fb0 to 0xdf8e1ff8)
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 r5:8026fa00 r4:82f3a040
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 3100 Comm: sshd Not tainted 6.11.0-rc6-syzkaller #0
Hardware name: ARM-Versatile Express
PC is at receive_mergeable drivers/net/virtio_net.c:2259 [inline]
PC is at receive_buf+0x2ac/0x118c drivers/net/virtio_net.c:2394
LR is at 0x10000
pc : [<80c73590>]    lr : [<00010000>]    psr: 20000113
sp : df801cd0  ip : 00000014  fp : df801d74
r10: 828bdf40  r9 : 00000001  r8 : 84656c10
r7 : 0009e418  r6 : dde97340  r5 : 83e49680  r4 : df801dc8
r3 : dde9735c  r2 : 00000003  r1 : 00000000  r0 : 846e8900
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 84646140  DAC: fffffffd
Call trace: frame pointer underflow
[<80c732e4>] (receive_buf) from [<80c75924>] (virtnet_receive_packets drivers/net/virtio_net.c:2699 [inline])
[<80c732e4>] (receive_buf) from [<80c75924>] (virtnet_receive drivers/net/virtio_net.c:2723 [inline])
[<80c732e4>] (receive_buf) from [<80c75924>] (virtnet_poll+0x9c8/0xef8 drivers/net/virtio_net.c:2818)
 r10:83e49680 r9:82f03808 r8:df801dc0 r7:84656c10 r6:82f03800 r5:00000001
 r4:df801dbc
[<80c74f5c>] (virtnet_poll) from [<81486550>] (__napi_poll+0x34/0x240 net/core/dev.c:6772)
 r10:dddd0f80 r9:dddd11c0 r8:df801ea0 r7:df801e9b r6:00000040 r5:82f03808
 r4:00000001
[<8148651c>] (__napi_poll) from [<81486d88>] (napi_poll net/core/dev.c:6841 [inline])
[<8148651c>] (__napi_poll) from [<81486d88>] (net_rx_action+0x338/0x420 net/core/dev.c:6963)
 r9:dddd11c0 r8:df801ea0 r7:0000012c r6:00013c11 r5:82f03808 r4:00000000
[<81486a50>] (net_rx_action) from [<8024b5e8>] (handle_softirqs+0x15c/0x468 kernel/softirq.c:554)
 r10:00000008 r9:83db1800 r8:00000100 r7:00400100 r6:00000003 r5:00000004
 r4:8260408c
[<8024b48c>] (handle_softirqs) from [<8024b9e4>] (__do_softirq kernel/softirq.c:588 [inline])
[<8024b48c>] (handle_softirqs) from [<8024b9e4>] (invoke_softirq kernel/softirq.c:428 [inline])
[<8024b48c>] (handle_softirqs) from [<8024b9e4>] (__irq_exit_rcu+0xa4/0x164 kernel/softirq.c:637)
 r10:7ec5027c r9:7ec501fc r8:00000000 r7:df971fb0 r6:821ad868 r5:821ed8f0
 r4:83db1800
[<8024b940>] (__irq_exit_rcu) from [<8024bce4>] (irq_exit+0x10/0x18 kernel/softirq.c:661)
 r5:821ed8f0 r4:824b8c1c
[<8024bcd4>] (irq_exit) from [<8197b7fc>] (generic_handle_arch_irq+0x7c/0x80 kernel/irq/handle.c:240)
[<8197b780>] (generic_handle_arch_irq) from [<8192cb7c>] (call_with_stack+0x1c/0x20 arch/arm/lib/call_with_stack.S:40)
 r9:7ec501fc r8:824ae044 r7:83db1800 r6:ffffffff r5:60000010 r4:76bbb39c
[<8192cb60>] (call_with_stack) from [<80200f48>] (__irq_usr+0x88/0xa0 arch/arm/kernel/entry-armv.S:436)
Exception stack(0xdf971fb0 to 0xdf971ff8)
1fa0:                                     000000c4 01bc4780 000000c4 00000000
1fc0: 01b9ed88 76fc7c80 00000455 00000004 00000001 7ec501fc 7ec5027c 00000000
1fe0: 00560db0 7ec50180 004e3adc 76bbb39c 60000010 ffffffff