Re: [lkp-robot] 9ddf3ebd04 [ 0.004000] BUG: scheduling while atomic: swapper/0/0x00000002

[Paul E. McKenney <paulmck@linux.vnet.ibm.com>]

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On Thu, Apr 12, 2018 at 12:57:07PM +0800, Boqun Feng wrote:
>  (Cc Paul and Peter)
> 
> On Thu, Apr 12, 2018 at 09:47:10AM +0800, kernel test robot wrote:
> > Greetings,
> > 
> > 0day kernel testing robot got the below dmesg and the first bad commit is
> > 
> > https://git.kernel.org/pub/scm/linux/kernel/git/boqun/linux.git arr-rfc-v6-rc1
> > 
> > commit 9ddf3ebd041d33b9de0e63a81e933774787c29d3
> > Author:     Boqun Feng <boqun.feng@gmail.com>
> > AuthorDate: Wed Apr 11 18:29:34 2018 +0800
> > Commit:     Boqun Feng <boqun.feng@gmail.com>
> > CommitDate: Wed Apr 11 19:58:05 2018 +0800
> > 
> >     lockdep/selftest: Add a test case for SRCU
> >     
> >     Since we now could detect deadlock cases for sleepable RCU, a self test
> >     case is added. More other complex scenarios may be added later to
> >     srcu_tests().
> >     
> >     Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
> >     Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
> > 
> > 4f30fa8872  rcu: Equip sleepable RCU with lockdep dependency graph checks
> > 9ddf3ebd04  lockdep/selftest: Add a test case for SRCU
> > +------------------------------------------------------+------------+------------+
> > |                                                      | 4f30fa8872 | 9ddf3ebd04 |
> > +------------------------------------------------------+------------+------------+
> > | boot_successes                                       | 22         | 0          |
> > | boot_failures                                        | 0          | 15         |
> > | BUG:scheduling_while_atomic                          | 0          | 15         |
> > | WARNING:at_kernel/locking/lockdep.c:#lock_release    | 0          | 15         |
> > | EIP:lock_release                                     | 0          | 15         |
> > | WARNING:at_kernel/locking/lockdep.c:#lock_unpin_lock | 0          | 15         |
> > | EIP:lock_unpin_lock                                  | 0          | 15         |
> > +------------------------------------------------------+------------+------------+
> > 
> > [    0.004000]   --------------------------------------------------------------------------
> > [    0.004000]   | SRCU tests |
> > [    0.004000]   ---------------
> > [    0.004000]          ABBA read-sync/read-sync:
> > [    0.004000] workqueue: round-robin CPU selection forced, expect performance impact
> > [    0.004000] BUG: scheduling while atomic: swapper/0/0x00000002
> > [    0.004000] 1 lock held by swapper/0:
> > [    0.004000]  #0:  (&srcu_A){.+.+}, at: [<(ptrval)>] srcu_ABBA+0x0/0x100
> > [    0.004000] Modules linked in:
> > [    0.004000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.16.0-00020-g9ddf3eb #1
> > [    0.004000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
> > [    0.004000] Call Trace:
> > [    0.004000]  dump_stack+0x16/0x19
> > [    0.004000]  __schedule_bug+0x67/0x90
> > [    0.004000]  __schedule+0x4ac/0x580
> > [    0.004000]  ? sched_clock+0x9/0x10
> > [    0.004000]  schedule+0x2d/0x80
> > [    0.004000]  schedule_timeout+0x155/0x1f0
> > [    0.004000]  ? mark_held_locks+0x74/0xa0
> > [    0.004000]  ? _raw_spin_unlock_irq+0x22/0x40
> > [    0.004000]  ? trace_hardirqs_on_caller+0xca/0x1d0
> > [    0.004000]  wait_for_common+0xff/0x1b0
> > [    0.004000]  ? wake_up_q+0x60/0x60
> > [    0.004000]  wait_for_completion+0x12/0x20
> > [    0.004000]  synchronize_srcu+0x83/0xa0
> > [    0.004000]  ? srcu_drive_gp+0x140/0x140
> > [    0.004000]  ? rcu_read_lock_held+0x50/0x50
> > [    0.004000]  ? wait_for_common+0x3b/0x1b0
> > [    0.004000]  ? ww_test_normal+0x270/0x270
> > [    0.004000]  srcu_ABBA+0x5b/0x100
> > [    0.004000]  ? ww_test_normal+0x270/0x270
> > [    0.004000]  dotest+0x2b/0x572
> > [    0.004000]  locking_selftest+0x29b6/0x2a50
> > [    0.004000]  start_kernel+0x321/0x47a
> > [    0.004000]  i386_start_kernel+0xb5/0xcd
> > [    0.004000]  startup_32_smp+0x164/0x168
> 
> So we met this problem because:
> 
> a)	all the lock selftest cases are called with preemption off,
> 	because locking_selftest() is called in start_kernel() with
> 	preemption off. (Note that the preemption off is actually fine
> 	for the selftest because the whole selftest is single-threaded,
> 	so all the acquisitions of locks will succeed in fast path, so
> 	no block. And if we hit a self deadlock, which will trigger a
> 	real block, the lockdep should report it, and we skip to the
> 	next test case with preempt count recoverd)
> 
> and
> 
> b)	we do a schedule() in srcu_ABBA() because we call
> 	synchronize_srcu(), note that SMP=n, so means we hit this for
> 	tiny SRCU. And I don't think we have a similar problem for tree
> 	SRCU.
> 
> So the problem is basically caused by an unconditional
> wait_for_completion() in tiny SRCU, which I think could be fixed by
> adding the rcu_scheduler_state check as the same for tree SRCU, like:
> 
> 	diff --git a/kernel/rcu/srcutiny.c b/kernel/rcu/srcutiny.c
> 	index bc89cb48d800..21f4765ef8ee 100644
> 	--- a/kernel/rcu/srcutiny.c
> 	+++ b/kernel/rcu/srcutiny.c
> 	@@ -190,6 +190,9 @@ void synchronize_srcu(struct srcu_struct *sp)
> 	 
> 		srcu_lock_sync(&sp->dep_map);
> 	 
> 	+	if (rcu_scheduler_active == RCU_SCHEDULER_INACTIVE)
> 	+		return;
> 	+
> 		init_rcu_head_on_stack(&rs.head);
> 		init_completion(&rs.completion);
> 		call_srcu(sp, &rs.head, wakeme_after_rcu);
> 
> I think this not only fixes the problem here, but also is the right way
> to do because for tiny SRCU, synchronize_srcu() should be a no-op if
> rcu scheduler is inactive, right?

Makes sense to me.

Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

> Thoughts?
> 
> Regards,
> Boqun
> 
> 
> > [    0.004000] ------------[ cut here ]------------
> > [    0.004000] releasing a pinned lock
> > [    0.004000] WARNING: CPU: 0 PID: 0 at kernel/locking/lockdep.c:3961 lock_release+0x294/0x2d0
> > [    0.004000] Modules linked in:
> > [    0.004000] CPU: 0 PID: 0 Comm: swapper Tainted: G        W        4.16.0-00020-g9ddf3eb #1
> > [    0.004000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
> > [    0.004000] EIP: lock_release+0x294/0x2d0
> > [    0.004000] EFLAGS: 00210096 CPU: 0
> > [    0.004000] EAX: 00000017 EBX: c1d4f4c0 ECX: c1d4f4c0 EDX: 00000120
> > [    0.004000] ESI: 00000002 EDI: c1d4f684 EBP: c1d41db4 ESP: c1d41d88
> > [    0.004000]  DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068
> > [    0.004000] CR0: 80050033 CR2: ffffffff CR3: 02002000 CR4: 000406b0
> > [    0.004000] Call Trace:
> > [    0.004000]  ? dequeue_task_idle+0xe/0x30
> > [    0.004000]  _raw_spin_unlock_irq+0x16/0x40
> > [    0.004000]  dequeue_task_idle+0xe/0x30
> > [    0.004000]  deactivate_task+0x3e/0x60
> > [    0.004000]  __schedule+0x2af/0x580
> > [    0.004000]  ? sched_clock+0x9/0x10
> > [    0.004000]  schedule+0x2d/0x80
> > [    0.004000]  schedule_timeout+0x155/0x1f0
> > [    0.004000]  ? mark_held_locks+0x74/0xa0
> > [    0.004000]  ? _raw_spin_unlock_irq+0x22/0x40
> > [    0.004000]  ? trace_hardirqs_on_caller+0xca/0x1d0
> > [    0.004000]  wait_for_common+0xff/0x1b0
> > [    0.004000]  ? wake_up_q+0x60/0x60
> > [    0.004000]  wait_for_completion+0x12/0x20
> > [    0.004000]  synchronize_srcu+0x83/0xa0
> > [    0.004000]  ? srcu_drive_gp+0x140/0x140
> > [    0.004000]  ? rcu_read_lock_held+0x50/0x50
> > [    0.004000]  ? wait_for_common+0x3b/0x1b0
> > [    0.004000]  ? ww_test_normal+0x270/0x270
> > [    0.004000]  srcu_ABBA+0x5b/0x100
> > [    0.004000]  ? ww_test_normal+0x270/0x270
> > [    0.004000]  dotest+0x2b/0x572
> > [    0.004000]  locking_selftest+0x29b6/0x2a50
> > [    0.004000]  start_kernel+0x321/0x47a
> > [    0.004000]  i386_start_kernel+0xb5/0xcd
> > [    0.004000]  startup_32_smp+0x164/0x168
> > [    0.004000] Code: 04 d3 c1 c2 c1 c7 04 24 77 f6 c0 c1 e8 16 bf fc ff 0f 0b 8b 45 dc e9 49 ff ff ff 8d 74 26 00 c7 04 24 14 cd c1 c1 e8 fc be fc ff <0f> 0b e9 06 fe ff ff 89 c1 c1 e1 04 c1 e0 08 29 c8 05 b0 a5 41
> > [    0.004000] ---[ end trace bb6731d7f8bef4b6 ]---
> > [    0.004000] bad: scheduling from the idle thread!
> > 
> >                                                           # HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD
> > git bisect start 731a8d48294ebee3dfa007533ff133a157364c39 0adb32858b0bddf4ada5f364a84ed60b196dbcda --
> > git bisect good 151cfecc709cae8004857cf4d3969de64b99dfc3  # 01:09  G     11     0    7   7  Merge 'linux-review/Jia-Ju-Bai/net-samsung-sxgbe-Replace-mdelay-with-usleep_range-in-sxgbe_sw_reset/20180411-225900' into devel-catchup-201804112323
> > git bisect  bad 0b02457602420fd0e2c34b05eec23c86f9296779  # 01:21  B      0    11   25   0  Merge 'powerpc/merge' into devel-catchup-201804112323
> > git bisect  bad 795173a818d1d584db3d94871f1d3ad39894b4cf  # 01:46  B      0    11   29   4  Merge 'linux-review/Xin-Long/sctp-do-not-check-port-in-sctp_inet6_cmp_addr/20180411-223639' into devel-catchup-201804112323
> > git bisect  bad 2a0a68336ae9a14f92fa549cd371b085d2b81974  # 01:58  B      0     8   25   3  Merge 'boqun/arr-rfc-v6-rc1' into devel-catchup-201804112323
> > git bisect good 4d9461b4080f42b26e61adfa1478ad8160e9b52f  # 02:16  G     11     0    4   4  lockdep: Adjust check_redundant() for recursive read change
> > git bisect good 51d4cdb55dfa83318c3e5f34d13ec5d7cffc9b11  # 02:28  G     10     0   10  10  lockdep/selftest: Unleash irq_read_recursion2 and add more
> > git bisect good 6120c8e00676b55c51721bd1c5c6e4fe004bb1b2  # 02:40  G     11     0    1   1  MAINTAINERS: Add myself as a LOCKING PRIMITIVES reviewer
> > git bisect  bad 9ddf3ebd041d33b9de0e63a81e933774787c29d3  # 02:52  B      0    11   27   2  lockdep/selftest: Add a test case for SRCU
> > git bisect good 4f30fa88728f28578e29e43cc7a78a29635d9981  # 03:12  G     11     0    6   6  rcu: Equip sleepable RCU with lockdep dependency graph checks
> > # first bad commit: [9ddf3ebd041d33b9de0e63a81e933774787c29d3] lockdep/selftest: Add a test case for SRCU
> > git bisect good 4f30fa88728f28578e29e43cc7a78a29635d9981  # 03:15  G     30     0   12  18  rcu: Equip sleepable RCU with lockdep dependency graph checks
> > # extra tests with debug options
> > git bisect  bad 9ddf3ebd041d33b9de0e63a81e933774787c29d3  # 03:29  B      0     1   15   0  lockdep/selftest: Add a test case for SRCU
> > # extra tests on HEAD of linux-devel/devel-catchup-201804112323
> > git bisect  bad 731a8d48294ebee3dfa007533ff133a157364c39  # 03:34  B      0   455  472   0  0day head guard for 'devel-catchup-201804112323'
> > # extra tests on tree/branch boqun/arr-rfc-v6-rc1
> > git bisect  bad 9ddf3ebd041d33b9de0e63a81e933774787c29d3  # 03:36  B      0    15   29   0  lockdep/selftest: Add a test case for SRCU
> > # extra tests with first bad commit reverted
> > git bisect good c7e1c792bddecd67873582dc6c3c7a6883ead09c  # 03:49  G     10     0    7   7  Revert "lockdep/selftest: Add a test case for SRCU"
> > 
> > ---
> > 0-DAY kernel test infrastructure                Open Source Technology Center
> > https://lists.01.org/pipermail/lkp                          Intel Corporation
> 
> 
> 
> > #!/bin/bash
> > 
> > kernel=$1
> > 
> > kvm=(
> > 	qemu-system-x86_64
> > 	-enable-kvm
> > 	-cpu Haswell,+smep,+smap
> > 	-kernel $kernel
> > 	-m 256
> > 	-smp 1
> > 	-device e1000,netdev=net0
> > 	-netdev user,id=net0
> > 	-boot order=nc
> > 	-no-reboot
> > 	-watchdog i6300esb
> > 	-watchdog-action debug
> > 	-rtc base=localtime
> > 	-serial stdio
> > 	-display none
> > 	-monitor null
> > )
> > 
> > append=(
> > 	root=/dev/ram0
> > 	hung_task_panic=1
> > 	debug
> > 	apic=debug
> > 	sysrq_always_enabled
> > 	rcupdate.rcu_cpu_stall_timeout=100
> > 	net.ifnames=0
> > 	printk.devkmsg=on
> > 	panic=-1
> > 	softlockup_panic=1
> > 	nmi_watchdog=panic
> > 	oops=panic
> > 	load_ramdisk=2
> > 	prompt_ramdisk=0
> > 	drbd.minor_count=8
> > 	systemd.log_level=err
> > 	ignore_loglevel
> > 	console=tty0
> > 	earlyprintk=ttyS0,115200
> > 	console=ttyS0,115200
> > 	vga=normal
> > 	rw
> > 	drbd.minor_count=8
> > 	rcuperf.shutdown=0
> > )
> > 
> > "${kvm[@]}" -append "${append[*]}"
> 
> > #
> > # Automatically generated file; DO NOT EDIT.
> > # Linux/i386 4.16.0 Kernel Configuration
> > #
> > # CONFIG_64BIT is not set
> > CONFIG_X86_32=y
> > CONFIG_X86=y
> > CONFIG_INSTRUCTION_DECODER=y
> > CONFIG_OUTPUT_FORMAT="elf32-i386"
> > CONFIG_ARCH_DEFCONFIG="arch/x86/configs/i386_defconfig"
> > CONFIG_LOCKDEP_SUPPORT=y
> > CONFIG_STACKTRACE_SUPPORT=y
> > CONFIG_MMU=y
> > CONFIG_ARCH_MMAP_RND_BITS_MIN=8
> > CONFIG_ARCH_MMAP_RND_BITS_MAX=16
> > CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MIN=8
> > CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MAX=16
> > CONFIG_NEED_DMA_MAP_STATE=y
> > CONFIG_NEED_SG_DMA_LENGTH=y
> > CONFIG_GENERIC_ISA_DMA=y
> > CONFIG_GENERIC_BUG=y
> > CONFIG_GENERIC_HWEIGHT=y
> > CONFIG_ARCH_MAY_HAVE_PC_FDC=y
> > CONFIG_RWSEM_XCHGADD_ALGORITHM=y
> > CONFIG_GENERIC_CALIBRATE_DELAY=y
> > CONFIG_ARCH_HAS_CPU_RELAX=y
> > CONFIG_ARCH_HAS_CACHE_LINE_SIZE=y
> > CONFIG_HAVE_SETUP_PER_CPU_AREA=y
> > CONFIG_NEED_PER_CPU_EMBED_FIRST_CHUNK=y
> > CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK=y
> > CONFIG_ARCH_HIBERNATION_POSSIBLE=y
> > CONFIG_ARCH_SUSPEND_POSSIBLE=y
> > CONFIG_ARCH_WANT_HUGE_PMD_SHARE=y
> > CONFIG_ARCH_WANT_GENERAL_HUGETLB=y
> > CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING=y
> > CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC=y
> > CONFIG_ARCH_SUPPORTS_UPROBES=y
> > CONFIG_FIX_EARLYCON_MEM=y
> > CONFIG_PGTABLE_LEVELS=3
> > CONFIG_IRQ_WORK=y
> > CONFIG_BUILDTIME_EXTABLE_SORT=y
> > CONFIG_THREAD_INFO_IN_TASK=y
> > 
> > #
> > # General setup
> > #
> > CONFIG_BROKEN_ON_SMP=y
> > CONFIG_INIT_ENV_ARG_LIMIT=32
> > CONFIG_CROSS_COMPILE=""
> > # CONFIG_COMPILE_TEST is not set
> > CONFIG_LOCALVERSION=""
> > CONFIG_LOCALVERSION_AUTO=y
> > CONFIG_HAVE_KERNEL_GZIP=y
> > CONFIG_HAVE_KERNEL_BZIP2=y
> > CONFIG_HAVE_KERNEL_LZMA=y
> > CONFIG_HAVE_KERNEL_XZ=y
> > CONFIG_HAVE_KERNEL_LZO=y
> > CONFIG_HAVE_KERNEL_LZ4=y
> > # CONFIG_KERNEL_GZIP is not set
> > # CONFIG_KERNEL_BZIP2 is not set
> > # CONFIG_KERNEL_LZMA is not set
> > # CONFIG_KERNEL_XZ is not set
> > CONFIG_KERNEL_LZO=y
> > # CONFIG_KERNEL_LZ4 is not set
> > CONFIG_DEFAULT_HOSTNAME="(none)"
> > CONFIG_SWAP=y
> > CONFIG_SYSVIPC=y
> > CONFIG_SYSVIPC_SYSCTL=y
> > # CONFIG_POSIX_MQUEUE is not set
> > # CONFIG_CROSS_MEMORY_ATTACH is not set
> > CONFIG_USELIB=y
> > CONFIG_AUDIT=y
> > CONFIG_HAVE_ARCH_AUDITSYSCALL=y
> > CONFIG_AUDITSYSCALL=y
> > CONFIG_AUDIT_WATCH=y
> > CONFIG_AUDIT_TREE=y
> > 
> > #
> > # IRQ subsystem
> > #
> > CONFIG_GENERIC_IRQ_PROBE=y
> > CONFIG_GENERIC_IRQ_SHOW=y
> > CONFIG_GENERIC_IRQ_CHIP=y
> > CONFIG_IRQ_DOMAIN=y
> > CONFIG_IRQ_SIM=y
> > CONFIG_GENERIC_IRQ_RESERVATION_MODE=y
> > CONFIG_IRQ_FORCED_THREADING=y
> > CONFIG_SPARSE_IRQ=y
> > CONFIG_GENERIC_IRQ_DEBUGFS=y
> > CONFIG_CLOCKSOURCE_WATCHDOG=y
> > CONFIG_ARCH_CLOCKSOURCE_DATA=y
> > CONFIG_CLOCKSOURCE_VALIDATE_LAST_CYCLE=y
> > CONFIG_GENERIC_TIME_VSYSCALL=y
> > CONFIG_GENERIC_CLOCKEVENTS=y
> > CONFIG_GENERIC_CLOCKEVENTS_MIN_ADJUST=y
> > CONFIG_GENERIC_CMOS_UPDATE=y
> > 
> > #
> > # Timers subsystem
> > #
> > CONFIG_TICK_ONESHOT=y
> > CONFIG_HZ_PERIODIC=y
> > # CONFIG_NO_HZ_IDLE is not set
> > CONFIG_NO_HZ=y
> > CONFIG_HIGH_RES_TIMERS=y
> > 
> > #
> > # CPU/Task time and stats accounting
> > #
> > CONFIG_TICK_CPU_ACCOUNTING=y
> > CONFIG_IRQ_TIME_ACCOUNTING=y
> > # CONFIG_BSD_PROCESS_ACCT is not set
> > # CONFIG_TASKSTATS is not set
> > 
> > #
> > # RCU Subsystem
> > #
> > CONFIG_TINY_RCU=y
> > CONFIG_RCU_EXPERT=y
> > CONFIG_SRCU=y
> > CONFIG_TINY_SRCU=y
> > CONFIG_TASKS_RCU=y
> > # CONFIG_RCU_STALL_COMMON is not set
> > # CONFIG_RCU_NEED_SEGCBLIST is not set
> > CONFIG_BUILD_BIN2C=y
> > CONFIG_IKCONFIG=y
> > CONFIG_IKCONFIG_PROC=y
> > CONFIG_LOG_BUF_SHIFT=20
> > CONFIG_PRINTK_SAFE_LOG_BUF_SHIFT=13
> > CONFIG_HAVE_UNSTABLE_SCHED_CLOCK=y
> > CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH=y
> > CONFIG_CGROUPS=y
> > # CONFIG_MEMCG is not set
> > # CONFIG_BLK_CGROUP is not set
> > # CONFIG_CGROUP_SCHED is not set
> > # CONFIG_CGROUP_PIDS is not set
> > # CONFIG_CGROUP_RDMA is not set
> > # CONFIG_CGROUP_FREEZER is not set
> > # CONFIG_CGROUP_HUGETLB is not set
> > # CONFIG_CGROUP_DEVICE is not set
> > # CONFIG_CGROUP_CPUACCT is not set
> > # CONFIG_CGROUP_PERF is not set
> > # CONFIG_CGROUP_BPF is not set
> > # CONFIG_CGROUP_DEBUG is not set
> > # CONFIG_SOCK_CGROUP_DATA is not set
> > CONFIG_NAMESPACES=y
> > CONFIG_UTS_NS=y
> > # CONFIG_IPC_NS is not set
> > # CONFIG_USER_NS is not set
> > # CONFIG_PID_NS is not set
> > # CONFIG_NET_NS is not set
> > # CONFIG_SCHED_AUTOGROUP is not set
> > # CONFIG_SYSFS_DEPRECATED is not set
> > CONFIG_RELAY=y
> > CONFIG_BLK_DEV_INITRD=y
> > CONFIG_INITRAMFS_SOURCE=""
> > CONFIG_RD_GZIP=y
> > CONFIG_RD_BZIP2=y
> > CONFIG_RD_LZMA=y
> > CONFIG_RD_XZ=y
> > CONFIG_RD_LZO=y
> > CONFIG_RD_LZ4=y
> > CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE=y
> > # CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
> > CONFIG_SYSCTL=y
> > CONFIG_ANON_INODES=y
> > CONFIG_HAVE_UID16=y
> > CONFIG_SYSCTL_EXCEPTION_TRACE=y
> > CONFIG_HAVE_PCSPKR_PLATFORM=y
> > CONFIG_BPF=y
> > # CONFIG_EXPERT is not set
> > CONFIG_UID16=y
> > CONFIG_MULTIUSER=y
> > CONFIG_SGETMASK_SYSCALL=y
> > CONFIG_SYSFS_SYSCALL=y
> > # CONFIG_SYSCTL_SYSCALL is not set
> > CONFIG_FHANDLE=y
> > CONFIG_POSIX_TIMERS=y
> > CONFIG_PRINTK=y
> > CONFIG_PRINTK_NMI=y
> > CONFIG_BUG=y
> > CONFIG_ELF_CORE=y
> > CONFIG_PCSPKR_PLATFORM=y
> > CONFIG_BASE_FULL=y
> > CONFIG_FUTEX=y
> > CONFIG_FUTEX_PI=y
> > CONFIG_EPOLL=y
> > CONFIG_SIGNALFD=y
> > CONFIG_TIMERFD=y
> > CONFIG_EVENTFD=y
> > CONFIG_SHMEM=y
> > CONFIG_AIO=y
> > CONFIG_ADVISE_SYSCALLS=y
> > CONFIG_MEMBARRIER=y
> > # CONFIG_CHECKPOINT_RESTORE is not set
> > CONFIG_KALLSYMS=y
> > CONFIG_KALLSYMS_ALL=y
> > # CONFIG_KALLSYMS_ABSOLUTE_PERCPU is not set
> > CONFIG_KALLSYMS_BASE_RELATIVE=y
> > CONFIG_BPF_SYSCALL=y
> > CONFIG_USERFAULTFD=y
> > CONFIG_ARCH_HAS_MEMBARRIER_SYNC_CORE=y
> > # CONFIG_EMBEDDED is not set
> > CONFIG_HAVE_PERF_EVENTS=y
> > CONFIG_PC104=y
> > 
> > #
> > # Kernel Performance Events And Counters
> > #
> > CONFIG_PERF_EVENTS=y
> > # CONFIG_DEBUG_PERF_USE_VMALLOC is not set
> > CONFIG_VM_EVENT_COUNTERS=y
> > CONFIG_SLUB_DEBUG=y
> > CONFIG_COMPAT_BRK=y
> > # CONFIG_SLAB is not set
> > CONFIG_SLUB=y
> > # CONFIG_SLAB_MERGE_DEFAULT is not set
> > CONFIG_SLAB_FREELIST_RANDOM=y
> > CONFIG_SLAB_FREELIST_HARDENED=y
> > # CONFIG_SYSTEM_DATA_VERIFICATION is not set
> > CONFIG_PROFILING=y
> > CONFIG_CRASH_CORE=y
> > CONFIG_KEXEC_CORE=y
> > CONFIG_OPROFILE=y
> > CONFIG_OPROFILE_EVENT_MULTIPLEX=y
> > CONFIG_HAVE_OPROFILE=y
> > CONFIG_OPROFILE_NMI_TIMER=y
> > # CONFIG_KPROBES is not set
> > CONFIG_JUMP_LABEL=y
> > CONFIG_STATIC_KEYS_SELFTEST=y
> > # CONFIG_UPROBES is not set
> > # CONFIG_HAVE_64BIT_ALIGNED_ACCESS is not set
> > CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS=y
> > CONFIG_ARCH_USE_BUILTIN_BSWAP=y
> > CONFIG_HAVE_IOREMAP_PROT=y
> > CONFIG_HAVE_KPROBES=y
> > CONFIG_HAVE_KRETPROBES=y
> > CONFIG_HAVE_OPTPROBES=y
> > CONFIG_HAVE_KPROBES_ON_FTRACE=y
> > CONFIG_HAVE_FUNCTION_ERROR_INJECTION=y
> > CONFIG_HAVE_NMI=y
> > CONFIG_HAVE_ARCH_TRACEHOOK=y
> > CONFIG_HAVE_DMA_CONTIGUOUS=y
> > CONFIG_GENERIC_SMP_IDLE_THREAD=y
> > CONFIG_ARCH_HAS_FORTIFY_SOURCE=y
> > CONFIG_ARCH_HAS_SET_MEMORY=y
> > CONFIG_HAVE_ARCH_THREAD_STRUCT_WHITELIST=y
> > CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT=y
> > CONFIG_HAVE_REGS_AND_STACK_ACCESS_API=y
> > CONFIG_HAVE_CLK=y
> > CONFIG_HAVE_DMA_API_DEBUG=y
> > CONFIG_HAVE_HW_BREAKPOINT=y
> > CONFIG_HAVE_MIXED_BREAKPOINTS_REGS=y
> > CONFIG_HAVE_USER_RETURN_NOTIFIER=y
> > CONFIG_HAVE_PERF_EVENTS_NMI=y
> > CONFIG_HAVE_HARDLOCKUP_DETECTOR_PERF=y
> > CONFIG_HAVE_PERF_REGS=y
> > CONFIG_HAVE_PERF_USER_STACK_DUMP=y
> > CONFIG_HAVE_ARCH_JUMP_LABEL=y
> > CONFIG_HAVE_RCU_TABLE_FREE=y
> > CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG=y
> > CONFIG_HAVE_ALIGNED_STRUCT_PAGE=y
> > CONFIG_HAVE_CMPXCHG_LOCAL=y
> > CONFIG_HAVE_CMPXCHG_DOUBLE=y
> > CONFIG_ARCH_WANT_IPC_PARSE_VERSION=y
> > CONFIG_HAVE_ARCH_SECCOMP_FILTER=y
> > CONFIG_HAVE_GCC_PLUGINS=y
> > CONFIG_GCC_PLUGINS=y
> > CONFIG_GCC_PLUGIN_LATENT_ENTROPY=y
> > CONFIG_GCC_PLUGIN_STRUCTLEAK=y
> > # CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL is not set
> > # CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE is not set
> > CONFIG_GCC_PLUGIN_RANDSTRUCT=y
> > CONFIG_GCC_PLUGIN_RANDSTRUCT_PERFORMANCE=y
> > CONFIG_HAVE_CC_STACKPROTECTOR=y
> > # CONFIG_CC_STACKPROTECTOR_NONE is not set
> > # CONFIG_CC_STACKPROTECTOR_REGULAR is not set
> > CONFIG_CC_STACKPROTECTOR_STRONG=y
> > # CONFIG_CC_STACKPROTECTOR_AUTO is not set
> > CONFIG_THIN_ARCHIVES=y
> > CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES=y
> > CONFIG_HAVE_IRQ_TIME_ACCOUNTING=y
> > CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE=y
> > CONFIG_HAVE_ARCH_HUGE_VMAP=y
> > CONFIG_HAVE_MOD_ARCH_SPECIFIC=y
> > CONFIG_MODULES_USE_ELF_REL=y
> > CONFIG_ARCH_HAS_ELF_RANDOMIZE=y
> > CONFIG_HAVE_ARCH_MMAP_RND_BITS=y
> > CONFIG_HAVE_EXIT_THREAD=y
> > CONFIG_ARCH_MMAP_RND_BITS=8
> > CONFIG_HAVE_COPY_THREAD_TLS=y
> > # CONFIG_HAVE_ARCH_HASH is not set
> > # CONFIG_ISA_BUS_API is not set
> > CONFIG_CLONE_BACKWARDS=y
> > CONFIG_OLD_SIGSUSPEND3=y
> > CONFIG_OLD_SIGACTION=y
> > # CONFIG_CPU_NO_EFFICIENT_FFS is not set
> > # CONFIG_HAVE_ARCH_VMAP_STACK is not set
> > # CONFIG_ARCH_OPTIONAL_KERNEL_RWX is not set
> > # CONFIG_ARCH_OPTIONAL_KERNEL_RWX_DEFAULT is not set
> > CONFIG_ARCH_HAS_STRICT_KERNEL_RWX=y
> > CONFIG_STRICT_KERNEL_RWX=y
> > CONFIG_ARCH_HAS_STRICT_MODULE_RWX=y
> > CONFIG_STRICT_MODULE_RWX=y
> > CONFIG_ARCH_HAS_PHYS_TO_DMA=y
> > CONFIG_ARCH_HAS_REFCOUNT=y
> > # CONFIG_REFCOUNT_FULL is not set
> > 
> > #
> > # GCOV-based kernel profiling
> > #
> > # CONFIG_GCOV_KERNEL is not set
> > CONFIG_ARCH_HAS_GCOV_PROFILE_ALL=y
> > CONFIG_HAVE_GENERIC_DMA_COHERENT=y
> > CONFIG_RT_MUTEXES=y
> > CONFIG_BASE_SMALL=0
> > CONFIG_MODULES=y
> > CONFIG_MODULE_FORCE_LOAD=y
> > # CONFIG_MODULE_UNLOAD is not set
> > CONFIG_MODVERSIONS=y
> > # CONFIG_MODULE_SRCVERSION_ALL is not set
> > # CONFIG_MODULE_SIG is not set
> > CONFIG_MODULE_COMPRESS=y
> > # CONFIG_MODULE_COMPRESS_GZIP is not set
> > CONFIG_MODULE_COMPRESS_XZ=y
> > CONFIG_MODULES_TREE_LOOKUP=y
> > CONFIG_BLOCK=y
> > # CONFIG_LBDAF is not set
> > CONFIG_BLK_SCSI_REQUEST=y
> > CONFIG_BLK_DEV_BSG=y
> > CONFIG_BLK_DEV_BSGLIB=y
> > CONFIG_BLK_DEV_INTEGRITY=y
> > CONFIG_BLK_DEV_ZONED=y
> > # CONFIG_BLK_CMDLINE_PARSER is not set
> > CONFIG_BLK_WBT=y
> > CONFIG_BLK_WBT_SQ=y
> > # CONFIG_BLK_WBT_MQ is not set
> > CONFIG_BLK_DEBUG_FS=y
> > CONFIG_BLK_SED_OPAL=y
> > 
> > #
> > # Partition Types
> > #
> > # CONFIG_PARTITION_ADVANCED is not set
> > CONFIG_AMIGA_PARTITION=y
> > CONFIG_MSDOS_PARTITION=y
> > CONFIG_EFI_PARTITION=y
> > CONFIG_BLK_MQ_PCI=y
> > CONFIG_BLK_MQ_VIRTIO=y
> > 
> > #
> > # IO Schedulers
> > #
> > CONFIG_IOSCHED_NOOP=y
> > CONFIG_IOSCHED_DEADLINE=y
> > # CONFIG_IOSCHED_CFQ is not set
> > CONFIG_DEFAULT_DEADLINE=y
> > # CONFIG_DEFAULT_NOOP is not set
> > CONFIG_DEFAULT_IOSCHED="deadline"
> > CONFIG_MQ_IOSCHED_DEADLINE=m
> > # CONFIG_MQ_IOSCHED_KYBER is not set
> > # CONFIG_IOSCHED_BFQ is not set
> > CONFIG_ASN1=y
> > CONFIG_UNINLINE_SPIN_UNLOCK=y
> > CONFIG_ARCH_SUPPORTS_ATOMIC_RMW=y
> > CONFIG_ARCH_USE_QUEUED_SPINLOCKS=y
> > CONFIG_ARCH_USE_QUEUED_RWLOCKS=y
> > CONFIG_ARCH_HAS_SYNC_CORE_BEFORE_USERMODE=y
> > # CONFIG_FREEZER is not set
> > 
> > #
> > # Processor type and features
> > #
> > CONFIG_ZONE_DMA=y
> > # CONFIG_SMP is not set
> > CONFIG_X86_FEATURE_NAMES=y
> > CONFIG_X86_FAST_FEATURE_TESTS=y
> > # CONFIG_GOLDFISH is not set
> > CONFIG_RETPOLINE=y
> > CONFIG_INTEL_RDT=y
> > # CONFIG_X86_EXTENDED_PLATFORM is not set
> > CONFIG_X86_INTEL_LPSS=y
> > # CONFIG_X86_AMD_PLATFORM_DEVICE is not set
> > CONFIG_IOSF_MBI=y
> > CONFIG_IOSF_MBI_DEBUG=y
> > CONFIG_X86_SUPPORTS_MEMORY_FAILURE=y
> > CONFIG_X86_32_IRIS=m
> > # CONFIG_SCHED_OMIT_FRAME_POINTER is not set
> > CONFIG_HYPERVISOR_GUEST=y
> > CONFIG_PARAVIRT=y
> > # CONFIG_PARAVIRT_DEBUG is not set
> > CONFIG_KVM_GUEST=y
> > # CONFIG_KVM_DEBUG_FS is not set
> > # CONFIG_PARAVIRT_TIME_ACCOUNTING is not set
> > CONFIG_PARAVIRT_CLOCK=y
> > CONFIG_NO_BOOTMEM=y
> > # CONFIG_M486 is not set
> > # CONFIG_M586 is not set
> > # CONFIG_M586TSC is not set
> > # CONFIG_M586MMX is not set
> > # CONFIG_M686 is not set
> > CONFIG_MPENTIUMII=y
> > # CONFIG_MPENTIUMIII is not set
> > # CONFIG_MPENTIUMM is not set
> > # CONFIG_MPENTIUM4 is not set
> > # CONFIG_MK6 is not set
> > # CONFIG_MK7 is not set
> > # CONFIG_MK8 is not set
> > # CONFIG_MCRUSOE is not set
> > # CONFIG_MEFFICEON is not set
> > # CONFIG_MWINCHIPC6 is not set
> > # CONFIG_MWINCHIP3D is not set
> > # CONFIG_MELAN is not set
> > # CONFIG_MGEODEGX1 is not set
> > # CONFIG_MGEODE_LX is not set
> > # CONFIG_MCYRIXIII is not set
> > # CONFIG_MVIAC3_2 is not set
> > # CONFIG_MVIAC7 is not set
> > # CONFIG_MCORE2 is not set
> > # CONFIG_MATOM is not set
> > # CONFIG_X86_GENERIC is not set
> > CONFIG_X86_INTERNODE_CACHE_SHIFT=5
> > CONFIG_X86_L1_CACHE_SHIFT=5
> > CONFIG_X86_INTEL_USERCOPY=y
> > CONFIG_X86_USE_PPRO_CHECKSUM=y
> > CONFIG_X86_TSC=y
> > CONFIG_X86_CMPXCHG64=y
> > CONFIG_X86_CMOV=y
> > CONFIG_X86_MINIMUM_CPU_FAMILY=6
> > CONFIG_X86_DEBUGCTLMSR=y
> > CONFIG_CPU_SUP_INTEL=y
> > CONFIG_CPU_SUP_AMD=y
> > CONFIG_CPU_SUP_CENTAUR=y
> > CONFIG_CPU_SUP_TRANSMETA_32=y
> > CONFIG_HPET_TIMER=y
> > CONFIG_HPET_EMULATE_RTC=y
> > CONFIG_DMI=y
> > CONFIG_SWIOTLB=y
> > CONFIG_IOMMU_HELPER=y
> > CONFIG_NR_CPUS_RANGE_BEGIN=1
> > CONFIG_NR_CPUS_RANGE_END=1
> > CONFIG_NR_CPUS_DEFAULT=1
> > CONFIG_NR_CPUS=1
> > # CONFIG_PREEMPT_NONE is not set
> > CONFIG_PREEMPT_VOLUNTARY=y
> > # CONFIG_PREEMPT is not set
> > CONFIG_PREEMPT_COUNT=y
> [...]