On 4/17/20 11:23 AM, kernel test robot wrote:
> Greeting,
> > FYI, we noticed the following commit (built with gcc-7):
>
> commit: a2ab7a1a38f4448a65b92bb1089f4feeb66f2015 ("[PATCH] scsi: iscsi: register sysfs for iscsi workqueue")
> url: https://urldefense.com/v3/__https://github.com/0day-ci/linux/commits/Bob-Liu/scsi-iscsi-register-sysfs-for-iscsi-workqueue/20200416-103108__;!!GqivPVa7Brio!Jjn2aP2TksliGs__LTE_GWRKPf7Vaiffy8tHW75AVPbDpSMnIP8aYAX9TnD7Vw$
> base: https://urldefense.com/v3/__https://git.kernel.org/cgit/linux/kernel/git/mkp/scsi.git__;!!GqivPVa7Brio!Jjn2aP2TksliGs__LTE_GWRKPf7Vaiffy8tHW75AVPbDpSMnIP8aYAVNDDBj1g$ for-next
>
Thanks, let me check how to workaround this.
> in testcase: boot
>
> on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 8G
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
> +---------------------------------------------------------+------------+------------+
> | | 1e4ffb8344 | a2ab7a1a38 |
> +---------------------------------------------------------+------------+------------+
> | boot_successes | 16 | 0 |
> | boot_failures | 0 | 12 |
> | WARNING:at_kernel/workqueue.c:#workqueue_sysfs_register | 0 | 11 |
> | RIP:workqueue_sysfs_register | 0 | 11 |
> | BUG:kernel_hang_in_boot_stage | 0 | 1 |
> +---------------------------------------------------------+------------+------------+
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
>
>
> [ 6.127134] WARNING: CPU: 1 PID: 1 at kernel/workqueue.c:5642 workqueue_sysfs_register+0x18/0x103
> [ 6.128910] Modules linked in:
> [ 6.128910] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.7.0-rc1-00026-ga2ab7a1a38f44 #1
> [ 6.128910] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
> [ 6.128910] RIP: 0010:workqueue_sysfs_register+0x18/0x103
> [ 6.128910] Code: 00 48 89 d8 74 05 e8 38 51 fe ff 48 83 c4 48 5b 5d c3 66 66 66 66 90 41 57 41 56 41 55 41 54 55 53 f6 87 02 01 00 00 08 74 0d <0f> 0b 41 bd ea ff ff ff e9 d0 00 00 00 48 89 fd bf e8 02 00 00 41
> [ 6.128910] RSP: 0000:ffffc90000013d80 EFLAGS: 00010202
> [ 6.128910] RAX: 0000000000000000 RBX: ffff88820bf61a00 RCX: 0000000000000000
> [ 6.128910] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88820bf61a00
> [ 6.128910] RBP: ffffc90000013e48 R08: 000000000000000c R09: ffff88820befdc10
> [ 6.128910] R10: ffff888226031080 R11: ffff88822a550800 R12: 0000000000000000
> [ 6.128910] R13: ffff88820bf61a20 R14: ffff88820bf61a10 R15: ffff88820bf61ab0
> [ 6.128910] FS: 0000000000000000(0000) GS:ffff88823fd00000(0000) knlGS:0000000000000000
> [ 6.128910] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 6.128910] CR2: 00000000ffaddf14 CR3: 000000000280a000 CR4: 00000000000406e0
> [ 6.128910] Call Trace:
> [ 6.128910] alloc_workqueue+0x36c/0x41f
> [ 6.128910] ? rdinit_setup+0x2b/0x2b
> [ 6.128910] ? fc_transport_init+0x8e/0x8e
> [ 6.128910] iscsi_transport_init+0x141/0x20b
> [ 6.128910] ? iscsi_free_session+0x6b/0x6b
> [ 6.128910] do_one_initcall+0x9d/0x1c0
> [ 6.128910] kernel_init_freeable+0x1e3/0x246
> [ 6.128910] ? rest_init+0xc6/0xc6
> [ 6.128910] kernel_init+0xa/0xff
> [ 6.128910] ret_from_fork+0x3a/0x50
> [ 6.128910] ---[ end trace 4d791dec3fcee1ed ]---
>
>
> To reproduce:
>
> # build kernel
> cd linux
> cp config-5.7.0-rc1-00026-ga2ab7a1a38f44 .config
> make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage
>
> git clone https://urldefense.com/v3/__https://github.com/intel/lkp-tests.git__;!!GqivPVa7Brio!Jjn2aP2TksliGs__LTE_GWRKPf7Vaiffy8tHW75AVPbDpSMnIP8aYAVgkKitTA$
> cd lkp-tests
> bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email
>
>
>
> Thanks,
> lkp
>
