Greeting,

FYI, we noticed the following commit (built with gcc-9):

commit: 5fc11eebb4a98df5324a4de369bb5ab7f0007ff7 ("block: open code create_task_io_context in set_task_ioprio")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

in testcase: trinity
version: trinity-x86_64-608712d8-1_20211217
with following parameters:

	runtime: 300s
	group: group-03

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 Icelake-Server -smp 4 -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>


[  199.732063][  T304]
[  200.732109][  T304] [main] 2042923 iterations. [F:1789119 S:257831 HI:137772]
[  200.732134][  T304]
[  201.732199][  T304] [main] 2058410 iterations. [F:1802841 S:259626 HI:139072]
[  201.732222][  T304]
[  202.194980][ T3822] general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN PTI
[  202.199740][ T3822] KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
[  202.203804][ T3822] CPU: 0 PID: 3822 Comm: trinity-c5 Not tainted 5.16.0-rc3-00106-g5fc11eebb4a9 #1
[  202.207941][ T3822] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[ 202.212006][ T3822] RIP: 0010:set_task_ioprio (kbuild/src/consumer/block/blk-ioc.c:307 kbuild/src/consumer/block/blk-ioc.c:271) 
[ 202.215715][ T3822] Code: 3c 02 00 0f 85 63 01 00 00 4c 8b b3 e0 0c 00 00 4d 85 f6 74 67 48 b8 00 00 00 00 00 fc ff df 49 8d 7e 10 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 01 0f 8e 28 01 00 00 66 41 89 6e 10 4c
All code
========
   0:	3c 02                	cmp    $0x2,%al
   2:	00 0f                	add    %cl,(%rdi)
   4:	85 63 01             	test   %esp,0x1(%rbx)
   7:	00 00                	add    %al,(%rax)
   9:	4c 8b b3 e0 0c 00 00 	mov    0xce0(%rbx),%r14
  10:	4d 85 f6             	test   %r14,%r14
  13:	74 67                	je     0x7c
  15:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1c:	fc ff df 
  1f:	49 8d 7e 10          	lea    0x10(%r14),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
  2a:*	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax		<-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 08                	je     0x3a
  32:	3c 01                	cmp    $0x1,%al
  34:	0f 8e 28 01 00 00    	jle    0x162
  3a:	66 41 89 6e 10       	mov    %bp,0x10(%r14)
  3f:	4c                   	rex.WR

Code starting with the faulting instruction
===========================================
   0:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax
   4:	84 c0                	test   %al,%al
   6:	74 08                	je     0x10
   8:	3c 01                	cmp    $0x1,%al
   a:	0f 8e 28 01 00 00    	jle    0x138
  10:	66 41 89 6e 10       	mov    %bp,0x10(%r14)
  15:	4c                   	rex.WR
[  202.224166][ T3822] RSP: 0018:ffffc90000bb7ea0 EFLAGS: 00010202
[  202.227972][ T3822] RAX: dffffc0000000000 RBX: ffff888161970000 RCX: ffff88813c9e60a0
[  202.231988][ T3822] RDX: 0000000000000002 RSI: ffff88816cbeba50 RDI: 0000000000000010
[  202.235967][ T3822] RBP: 0000000049e6748d R08: 0000000000000001 R09: 00000000800000cd
[  202.239986][ T3822] R10: ffff888165a0c000 R11: fffff52000176f64 R12: 0000000000000000
[  202.243894][ T3822] R13: ffff888161970c80 R14: 0000000000000000 R15: ffff888161970ce0
[  202.247875][ T3822] FS:  00007f4487917740(0000) GS:ffff8883dd600000(0000) knlGS:0000000000000000
[  202.251972][ T3822] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  202.255792][ T3822] CR2: 0000000000000001 CR3: 0000000111d46005 CR4: 0000000000370ef0
[  202.259884][ T3822] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  202.264043][ T3822] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  202.268188][ T3822] Call Trace:
[  202.271645][ T3822]  <TASK>
[ 202.275242][ T3822] __x64_sys_ioprio_set (kbuild/src/consumer/block/ioprio.c:99 kbuild/src/consumer/block/ioprio.c:68 kbuild/src/consumer/block/ioprio.c:68) 
[ 202.279213][ T3822] do_syscall_64 (kbuild/src/consumer/arch/x86/entry/common.c:50 kbuild/src/consumer/arch/x86/entry/common.c:80) 
[ 202.282703][ T3822] entry_SYSCALL_64_after_hwframe (kbuild/src/consumer/arch/x86/entry/entry_64.S:113) 
[  202.286328][ T3822] RIP: 0033:0x7f4487a2ef59
[ 202.289794][ T3822] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 07 6f 0c 00 f7 d8 64 89 01 48
All code
========
   0:	00 c3                	add    %al,%bl
   2:	66 2e 0f 1f 84 00 00 	nopw   %cs:0x0(%rax,%rax,1)
   9:	00 00 00 
   c:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  11:	48 89 f8             	mov    %rdi,%rax
  14:	48 89 f7             	mov    %rsi,%rdi
  17:	48 89 d6             	mov    %rdx,%rsi
  1a:	48 89 ca             	mov    %rcx,%rdx
  1d:	4d 89 c2             	mov    %r8,%r10
  20:	4d 89 c8             	mov    %r9,%r8
  23:	4c 8b 4c 24 08       	mov    0x8(%rsp),%r9
  28:	0f 05                	syscall 
  2a:*	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax		<-- trapping instruction
  30:	73 01                	jae    0x33
  32:	c3                   	retq   
  33:	48 8b 0d 07 6f 0c 00 	mov    0xc6f07(%rip),%rcx        # 0xc6f41
  3a:	f7 d8                	neg    %eax
  3c:	64 89 01             	mov    %eax,%fs:(%rcx)
  3f:	48                   	rex.W

Code starting with the faulting instruction
===========================================
   0:	48 3d 01 f0 ff ff    	cmp    $0xfffffffffffff001,%rax
   6:	73 01                	jae    0x9
   8:	c3                   	retq   
   9:	48 8b 0d 07 6f 0c 00 	mov    0xc6f07(%rip),%rcx        # 0xc6f17
  10:	f7 d8                	neg    %eax
  12:	64 89 01             	mov    %eax,%fs:(%rcx)
  15:	48                   	rex.W
[  202.297968][ T3822] RSP: 002b:00007ffcbe0d2e88 EFLAGS: 00000246 ORIG_RAX: 00000000000000fb
[  202.302094][ T3822] RAX: ffffffffffffffda RBX: 00000000000000fb RCX: 00007f4487a2ef59
[  202.306071][ T3822] RDX: 000cce0d49e6748d RSI: 0000000000000000 RDI: 0000000000000002
[  202.309972][ T3822] RBP: 00000000000000fb R08: 006663fb7a93f088 R09: 000000d002a1b7fa
[  202.313922][ T3822] R10: 01448cd5553d0d0b R11: 0000000000000246 R12: 0000000000000002
[  202.317885][ T3822] R13: 00007f4486398058 R14: 00007f44879176c0 R15: 00007f4486398000
[  202.321930][ T3822]  </TASK>
[  202.325418][ T3822] Modules linked in: hidp bnep rfcomm bluetooth ecdh_generic ecc rfkill can_bcm can_raw can crypto_user ib_core nfnetlink scsi_transport_iscsi atm sctp ip6_udp_tunnel udp_tunnel libcrc32c sr_mod cdrom sg bochs drm_vram_helper ata_generic drm_ttm_helper intel_rapl_msr ttm ppdev intel_rapl_common drm_kms_helper crct10dif_pclmul crc32_pclmul syscopyarea crc32c_intel sysfillrect ata_piix ghash_clmulni_intel sysimgblt parport_pc fb_sys_fops ipmi_devintf joydev ipmi_msghandler drm libata parport serio_raw i2c_piix4 ip_tables
[  202.347317][ T3822] ---[ end trace 1a338450ee2dcc21 ]---
[ 202.351377][ T3822] RIP: 0010:set_task_ioprio (kbuild/src/consumer/block/blk-ioc.c:307 kbuild/src/consumer/block/blk-ioc.c:271) 
[ 202.355399][ T3822] Code: 3c 02 00 0f 85 63 01 00 00 4c 8b b3 e0 0c 00 00 4d 85 f6 74 67 48 b8 00 00 00 00 00 fc ff df 49 8d 7e 10 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 01 0f 8e 28 01 00 00 66 41 89 6e 10 4c
All code
========
   0:	3c 02                	cmp    $0x2,%al
   2:	00 0f                	add    %cl,(%rdi)
   4:	85 63 01             	test   %esp,0x1(%rbx)
   7:	00 00                	add    %al,(%rax)
   9:	4c 8b b3 e0 0c 00 00 	mov    0xce0(%rbx),%r14
  10:	4d 85 f6             	test   %r14,%r14
  13:	74 67                	je     0x7c
  15:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1c:	fc ff df 
  1f:	49 8d 7e 10          	lea    0x10(%r14),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
  2a:*	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax		<-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 08                	je     0x3a
  32:	3c 01                	cmp    $0x1,%al
  34:	0f 8e 28 01 00 00    	jle    0x162
  3a:	66 41 89 6e 10       	mov    %bp,0x10(%r14)
  3f:	4c                   	rex.WR

Code starting with the faulting instruction
===========================================
   0:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax
   4:	84 c0                	test   %al,%al
   6:	74 08                	je     0x10
   8:	3c 01                	cmp    $0x1,%al
   a:	0f 8e 28 01 00 00    	jle    0x138
  10:	66 41 89 6e 10       	mov    %bp,0x10(%r14)
  15:	4c                   	rex.WR
[  202.365062][ T3822] RSP: 0018:ffffc90000bb7ea0 EFLAGS: 00010202
[  202.369287][ T3822] RAX: dffffc0000000000 RBX: ffff888161970000 RCX: ffff88813c9e60a0
[  202.373596][ T3822] RDX: 0000000000000002 RSI: ffff88816cbeba50 RDI: 0000000000000010
[  202.377890][ T3822] RBP: 0000000049e6748d R08: 0000000000000001 R09: 00000000800000cd
[  202.382415][ T3822] R10: ffff888165a0c000 R11: fffff52000176f64 R12: 0000000000000000
[  202.386872][ T3822] R13: ffff888161970c80 R14: 0000000000000000 R15: ffff888161970ce0
[  202.391351][ T3822] FS:  00007f4487917740(0000) GS:ffff8883dd600000(0000) knlGS:0000000000000000
[  202.395763][ T3822] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  202.399916][ T3822] CR2: 0000000000000001 CR3: 0000000111d46005 CR4: 0000000000370ef0
[  202.404185][ T3822] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  202.408395][ T3822] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  202.412492][ T3822] Kernel panic - not syncing: Fatal exception
[  203.531249][ T3822] Shutting down cpus with NMI
[  203.535909][ T3822] Kernel Offset: 0x9a00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)

Kboot worker: lkp-worker41
Elapsed time: 240


To reproduce:

        # build kernel
	cd linux
	cp config-5.16.0-rc3-00106-g5fc11eebb4a9 .config
	make HOSTCC=gcc-9 CC=gcc-9 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules
	make HOSTCC=gcc-9 CC=gcc-9 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.



---
0DAY/LKP+ Test Infrastructure                   Open Source Technology Center
https://lists.01.org/hyperkitty/list/lkp@lists.01.org       Intel Corporation

Thanks,
Oliver Sang