syzbot

Freezing user space processes ... (elapsed 0.009 seconds) done.
OOM killer disabled.
Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
printk: Suspending console(s) (use no_console_suspend to debug)
==================================================================
BUG: KCSAN: data-race in __device_suspend_noirq / dpm_wait_fn

write to 0xffff88810094835c of 2 bytes by task 16111 on cpu 0:
 __device_suspend_noirq+0x992/0xcd0 drivers/base/power/main.c:1241
 async_suspend_noirq+0x2b/0x1c0 drivers/base/power/main.c:1268
 async_run_entry_fn+0x4a/0x170 kernel/async.c:127
 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2276
 worker_thread+0x636/0xae0 kernel/workqueue.c:2422
 kthread+0x1d0/0x1f0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff88810094835c of 2 bytes by task 29049 on cpu 1:
 dpm_wait drivers/base/power/main.c:245 [inline]
 dpm_wait_fn+0x77/0xb0 drivers/base/power/main.c:251
 device_for_each_child+0x81/0xe0 drivers/base/core.c:3645
 dpm_wait_for_children drivers/base/power/main.c:257 [inline]
 dpm_wait_for_subordinate drivers/base/power/main.c:340 [inline]
 __device_suspend_noirq+0xb7/0xcd0 drivers/base/power/main.c:1201
 device_suspend_noirq drivers/base/power/main.c:1282 [inline]
 dpm_noirq_suspend_devices+0x15a/0x790 drivers/base/power/main.c:1301
 dpm_suspend_noirq+0x1f/0x80 drivers/base/power/main.c:1347
 suspend_enter+0x144/0x8f0 kernel/power/suspend.c:408
 suspend_devices_and_enter+0x1cb/0x500 kernel/power/suspend.c:505
 enter_state+0x274/0x530 kernel/power/suspend.c:586
 pm_suspend+0x4b/0x130 kernel/power/suspend.c:613
 state_store+0x1f2/0x210 kernel/power/main.c:658
 kobj_attr_store+0x40/0x60 lib/kobject.c:856
 sysfs_kf_write+0xa6/0xc0 fs/sysfs/file.c:139
 kernfs_fop_write_iter+0x1d3/0x2d0 fs/kernfs/file.c:296
 call_write_iter include/linux/fs.h:2114 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4c0 fs/read_write.c:866
 vfs_iter_write+0x4c/0x70 fs/read_write.c:907
 iter_file_splice_write+0x40a/0x750 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x650 fs/splice.c:891
 do_splice_direct+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x773/0xda0 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1319 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1311
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x015e -> 0x017e

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 29049 Comm: syz-executor.0 Tainted: G        W         5.13.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
ACPI: Preparing to enter system sleep state S3
PM: Saving platform NVS memory
Disabling non-boot CPUs ...
smpboot: CPU 1 is now offline
kvm-clock: cpu 0, msr 4506001, primary cpu clock, resume
ACPI: Low-level resume complete
PM: Restoring platform NVS memory
kvm-guest: stealtime: cpu 0, msr 237c170c0
Enabling non-boot CPUs ...
x86: Booting SMP configuration:
smpboot: Booting Node 0 Processor 1 APIC 0x1
CPU1 is up
ACPI: Waking up from system sleep state S3
OOM killer enabled.
Restarting tasks ... done.
PM: suspend exit