Greeting,

FYI, we noticed the following commit (built with gcc-11):

commit: 38a12ad69d86f801fac544e6e50cca2a0a8b040b ("lib/dump_stack: add dump_stack_print_cmdline() and wire up in dump_stack_print_info()")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

in testcase: trinity
version: trinity-static-x86_64-x86_64-1c734c75-1_2020-01-06
with following parameters:

	runtime: 300s
	group: group-00

test-description: Trinity is a linux system call fuzz tester.
test-url: http://codemonkey.org.uk/projects/trinity/


on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@intel.com>


[   85.432613][ T3396] BUG: KCSAN: data-race in __d_add / __d_add
[   85.433883][ T3396]
[   85.434366][ T3396] write (marked) to 0xffff888100411fe8 of 4 bytes by task 3397 on cpu 0:
[ 85.435783][ T3396] __d_add (fs/dcache.c:2594 fs/dcache.c:2779) 
[ 85.436597][ T3396] d_add (fs/dcache.c:2801) 
[ 85.437344][ T3396] simple_lookup (fs/libfs.c:76 fs/libfs.c:69) 
[ 85.438231][ T3396] lookup_open+0x400/0x9c0 
[ 85.439214][ T3396] open_last_lookups (fs/namei.c:3482) 
[ 85.440097][ T3396] path_openat (fs/namei.c:3688 (discriminator 1)) 
[ 85.441034][ T3396] do_filp_open (fs/namei.c:3718) 
[ 85.441929][ T3396] do_sys_openat2 (fs/open.c:1312) 
[ 85.442778][ T3396] __x64_sys_openat (fs/open.c:1338) 
[ 85.443664][ T3396] do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80) 
[ 85.444522][ T3396] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120) 
[   85.446278][ T3396]
[   85.446735][ T3396] read to 0xffff888100411fe8 of 4 bytes by task 3396 on cpu 1:
[ 85.448192][ T3396] __d_add (fs/dcache.c:2584 fs/dcache.c:2766) 
[ 85.448949][ T3396] d_add (fs/dcache.c:2801) 
[ 85.449661][ T3396] simple_lookup (fs/libfs.c:76 fs/libfs.c:69) 
[ 85.462985][ T3396] __lookup_slow (include/linux/dcache.h:358 include/linux/dcache.h:363 fs/namei.c:1686) 
[ 85.478814][ T3396] walk_component (include/linux/fs.h:771 fs/namei.c:1703 fs/namei.c:1993) 
[ 85.491602][ T3396] link_path_walk+0x4b9/0x830 
[ 85.504683][ T3396] path_openat (fs/namei.c:3687 fs/namei.c:3687) 
[ 85.517679][ T3396] do_filp_open (fs/namei.c:3718) 
[ 85.530891][ T3396] do_sys_openat2 (fs/open.c:1312) 
[ 85.543268][ T3396] __x64_sys_openat (fs/open.c:1338) 
[ 85.555899][ T3396] do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80) 
[ 85.568696][ T3396] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120) 
[   85.583627][ T3396]
[   85.597341][ T3396] value changed: 0x0000c04d -> 0x0000c04e
[   85.609190][ T3396]
[   85.624644][ T3396] Reported by Kernel Concurrency Sanitizer on:
[   85.636543][ T3396] CPU: 1 PID: 3396 Comm: md5sum Not tainted 6.0.0-rc1-00030-g38a12ad69d86 #1
[   85.649959][ T3396] BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1521
[   85.664326][ T3396] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 3396, name: md5sum
[   85.679581][ T3396] preempt_count: 2, expected: 0
[   85.691944][ T3396] CPU: 1 PID: 3396 Comm: md5sum Not tainted 6.0.0-rc1-00030-g38a12ad69d86 #1
[   85.707643][ T3396] md5sum[3396] cmdline: md5sum
[   85.719880][ T3396] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-4 04/01/2014
[   85.732840][ T3396] Call Trace:
[   85.745164][ T3396]  <TASK>
[ 85.760123][ T3396] dump_stack_lvl (lib/dump_stack.c:141 (discriminator 1)) 
[ 85.772205][ T3396] dump_stack (lib/dump_stack.c:148) 
[ 85.783949][ T3396] __might_resched.cold (kernel/sched/core.c:9893) 
[ 85.796594][ T3396] down_read_killable (kernel/locking/rwsem.c:1521) 
[ 85.808427][ T3396] ? desc_read_finalized_seq (kernel/printk/printk_ringbuffer.c:1788) 
[ 85.822620][ T3396] __access_remote_vm (include/linux/mmap_lock.h:126 mm/memory.c:5439) 
[ 85.837807][ T3396] ? desc_read (kernel/printk/printk_ringbuffer.c:536) 
[ 85.849076][ T3396] access_remote_vm (mm/memory.c:5511) 
[ 85.862938][ T3396] get_mm_cmdline+0x179/0x500 
[ 85.878072][ T3396] ? write_comp_data (kernel/kcov.c:229) 
[ 85.888643][ T3396] get_task_cmdline_kernel (fs/proc/base.c:367 fs/proc/base.c:367) 
[ 85.899354][ T3396] dump_stack_print_cmdline (lib/dump_stack.c:78 (discriminator 1)) 
[ 85.910049][ T3396] dump_stack_print_info (lib/dump_stack.c:105 lib/dump_stack.c:97) 
[ 85.920667][ T3396] ? __d_add (fs/dcache.c:2594 fs/dcache.c:2779) 
[ 85.931191][ T3396] print_report.cold (kernel/kcsan/report.c:493) 
[ 85.941628][ T3396] ? __d_add (fs/dcache.c:2594 fs/dcache.c:2779) 
[ 85.956243][ T3396] ? kcsan_report_known_origin (kernel/kcsan/report.c:693) 
[ 85.967078][ T3396] ? kcsan_setup_watchpoint (kernel/kcsan/core.c:667) 
[ 85.977766][ T3396] ? __d_add (fs/dcache.c:2584 fs/dcache.c:2766) 
[ 85.988428][ T3396] ? d_add (fs/dcache.c:2801) 
[ 85.998787][ T3396] ? simple_lookup (fs/libfs.c:76 fs/libfs.c:69) 
[ 86.009466][ T3396] ? __lookup_slow (include/linux/dcache.h:358 include/linux/dcache.h:363 fs/namei.c:1686) 
[ 86.020166][ T3396] ? walk_component (include/linux/fs.h:771 fs/namei.c:1703 fs/namei.c:1993) 
[ 86.034736][ T3396] ? link_path_walk+0x4b9/0x830 
[ 86.047554][ T3396] ? path_openat (fs/namei.c:3687 fs/namei.c:3687) 
[ 86.057856][ T3396] ? do_filp_open (fs/namei.c:3718) 
[ 86.068332][ T3396] ? do_sys_openat2 (fs/open.c:1312) 
[ 86.078592][ T3396] ? __x64_sys_openat (fs/open.c:1338) 
[ 86.089065][ T3396] ? do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80) 
[ 86.100363][ T3396] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120) 
[ 86.110794][ T3396] ? rb_insert_color (lib/rbtree.c:110 lib/rbtree.c:436) 
[ 86.121069][ T3396] ? __list_add_valid (lib/list_debug.c:30 (discriminator 8)) 
[ 86.131589][ T3396] ? __create_object+0x216/0x3c0 
[ 86.144410][ T3396] kcsan_report_known_origin (kernel/kcsan/report.c:693) 
[ 86.159807][ T3396] kcsan_setup_watchpoint (kernel/kcsan/core.c:667) 
[ 86.170312][ T3396] ? __d_add (fs/dcache.c:2584 fs/dcache.c:2766) 
[ 86.180749][ T3396] __d_add (fs/dcache.c:2584 fs/dcache.c:2766) 
[ 86.191132][ T3396] ? write_comp_data (kernel/kcov.c:229) 
[ 86.203311][ T3396] d_add (fs/dcache.c:2801) 
[ 86.216293][ T3396] simple_lookup (fs/libfs.c:76 fs/libfs.c:69) 
[ 86.226457][ T3396] __lookup_slow (include/linux/dcache.h:358 include/linux/dcache.h:363 fs/namei.c:1686) 
[ 86.236465][ T3396] walk_component (include/linux/fs.h:771 fs/namei.c:1703 fs/namei.c:1993) 
[ 86.246249][ T3396] link_path_walk+0x4b9/0x830 
[ 86.260069][ T3396] path_openat (fs/namei.c:3687 fs/namei.c:3687) 
[ 86.269582][ T3396] ? write_comp_data (kernel/kcov.c:229) 
[ 86.279972][ T3396] do_filp_open (fs/namei.c:3718) 
[ 86.292414][ T3396] ? _find_next_bit (lib/find_bit.c:70) 
[ 86.302682][ T3396] ? write_comp_data (kernel/kcov.c:229) 
[ 86.311257][ T3396] ? alloc_fd (arch/x86/include/asm/paravirt.h:596 (discriminator 10) arch/x86/include/asm/qspinlock.h:57 (discriminator 10) include/linux/spinlock.h:202 (discriminator 10) include/linux/spinlock_api_smp.h:142 (discriminator 10) include/linux/spinlock.h:389 (discriminator 10) fs/file.c:553 (discriminator 10)) 
[ 86.319885][ T3396] do_sys_openat2 (fs/open.c:1312) 
[ 86.328559][ T3396] ? blkcg_maybe_throttle_current (block/blk-cgroup.c:1835) 
[ 86.337698][ T3396] __x64_sys_openat (fs/open.c:1338) 
[ 86.346690][ T3396] do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80) 
[ 86.357529][ T3396] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120) 
[   86.366643][ T3396] RIP: 0033:0x7fdd4c70365d
[ 86.375410][ T3396] Code: 48 89 54 24 e0 41 83 e2 40 75 32 89 f0 25 00 00 41 00 3d 00 00 41 00 74 24 89 f2 b8 01 01 00 00 48 89 fe bf 9c ff ff ff 0f 05 <48> 3d 00 f0 ff ff 77 33 c3 66 2e 0f 1f 84 00 00 00 00 00 48 8d 44
All code
========
   0:	48 89 54 24 e0       	mov    %rdx,-0x20(%rsp)
   5:	41 83 e2 40          	and    $0x40,%r10d
   9:	75 32                	jne    0x3d
   b:	89 f0                	mov    %esi,%eax
   d:	25 00 00 41 00       	and    $0x410000,%eax
  12:	3d 00 00 41 00       	cmp    $0x410000,%eax
  17:	74 24                	je     0x3d
  19:	89 f2                	mov    %esi,%edx
  1b:	b8 01 01 00 00       	mov    $0x101,%eax
  20:	48 89 fe             	mov    %rdi,%rsi
  23:	bf 9c ff ff ff       	mov    $0xffffff9c,%edi
  28:	0f 05                	syscall 
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 33                	ja     0x65
  32:	c3                   	retq   
  33:	66 2e 0f 1f 84 00 00 	nopw   %cs:0x0(%rax,%rax,1)
  3a:	00 00 00 
  3d:	48                   	rex.W
  3e:	8d                   	.byte 0x8d
  3f:	44                   	rex.R

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 33                	ja     0x3b
   8:	c3                   	retq   
   9:	66 2e 0f 1f 84 00 00 	nopw   %cs:0x0(%rax,%rax,1)
  10:	00 00 00 
  13:	48                   	rex.W
  14:	8d                   	.byte 0x8d
  15:	44                   	rex.R
[   86.397505][ T3396] RSP: 002b:00007ffc1d091f68 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
[   86.410198][ T3396] RAX: ffffffffffffffda RBX: 0000000000000011 RCX: 00007fdd4c70365d
[   86.420956][ T3396] RDX: 0000000000080000 RSI: 00007ffc1d092000 RDI: 00000000ffffff9c
[   86.432607][ T3396] RBP: 00007ffc1d091fe0 R08: 0000000000000000 R09: 00007ffc1d0921ff
[   86.443609][ T3396] R10: 0000000000000000 R11: 0000000000000287 R12: 00007ffc1d092210
[   86.456723][ T3396] R13: 0000000000000006 R14: 00007ffc1d0921ff R15: 0000000000000000
[   86.469996][ T3396]  </TASK>
[   86.480303][ T3396] md5sum[3396] cmdline: md5sum
[   86.493511][ T3396] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-4 04/01/2014
[   86.508870][ T3396] ==================================================================
[  104.056829][ T3700] sctp: Hash tables configured (bind 256/256)
[  104.085093][ T3645] trinity-main uses obsolete (PF_INET,SOCK_PACKET)
[  104.297267][ T3716] NET: Registered PF_ATMPVC protocol family
[  104.327671][ T3716] NET: Registered PF_ATMSVC protocol family
[  104.709220][ T3728] Loading iSCSI transport class v2.0-870.
[  105.546910][ T3770] can: controller area network core
[  105.572749][ T3770] NET: Registered PF_CAN protocol family
[  105.629961][ T3771] can: raw protocol
[  105.687681][ T3772] can: broadcast manager protocol
[  105.797817][ T3776] Bluetooth: RFCOMM TTY layer initialized
[  105.818963][ T3776] Bluetooth: RFCOMM socket layer initialized
[  105.843680][ T3776] Bluetooth: RFCOMM ver 1.11
[  105.906851][ T3778] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[  105.927252][ T3778] Bluetooth: BNEP filters: protocol multicast
[  105.949430][ T3778] Bluetooth: BNEP socket layer initialized
[  106.020379][ T3780] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
[  106.041721][ T3780] Bluetooth: HIDP socket layer initialized
[  106.405731][ T3818] VFS: Warning: trinity-c7 using old stat() call. Recompile your binary.
[  106.441679][ T3818] raw_sendmsg: trinity-c7 forgot to set AF_INET. Fix it!
[  106.485818][ T3818] Zero length message leads to an empty skb
[  106.588164][ T3819] Guest personality initialized and is inactive
[  106.614660][ T3819] VMCI host device registered (name=vmci, major=10, minor=124)
[  106.640596][ T3819] Initialized host personality
[  106.704604][ T3819] NET: Registered PF_VSOCK protocol family
[  106.961049][ T3818] VFS: Warning: trinity-c7 using old stat() call. Recompile your binary.
[  107.316143][ T3818] VFS: Warning: trinity-c7 using old stat() call. Recompile your binary.
[  107.340298][ T3818] VFS: Warning: trinity-c7 using old stat() call. Recompile your binary.
[  107.459492][ T3823] NET: Registered PF_IEEE802154 protocol family
[  107.704743][ T3814] VFS: Warning: trinity-c3 using old stat() call. Recompile your binary.
[  109.827821][ T3851] NET: Registered PF_KEY protocol family
[  113.211528][ T3900] can: request_module (can-proto-3) failed.
[  119.409606][ T3895] mmap: trinity-c3 (3895): VmData 15736832 exceed data ulimit 0. Update limits or use boot option ignore_rlimit_data.

Kboot worker: lkp-worker08
Elapsed time: 120

kvm=(
qemu-system-x86_64
-enable-kvm
-cpu SandyBridge
-kernel $kernel
-initrd initrd-vm-meta-159.cgz
-m 16384
-smp 2


To reproduce:

        # build kernel
	cd linux
	cp config-6.0.0-rc1-00030-g38a12ad69d86 .config
	make HOSTCC=gcc-11 CC=gcc-11 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules
	make HOSTCC=gcc-11 CC=gcc-11 ARCH=x86_64 INSTALL_MOD_PATH=<mod-install-dir> modules_install
	cd <mod-install-dir>
	find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz


        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email

        # if come across any failure that blocks the test,
        # please remove ~/.lkp and /lkp dir to run from a clean state.



-- 
0-DAY CI Kernel Test Service
https://01.org/lkp