Re: [lkp] [blk] ee5c4fef9f: BUG: unable to handle kernel NULL pointer dereference at 0000010b

2016-07-29 Thread Minfei Huang 
Hi, Xiaolong.

I think it’s the correct behaviour for my patch to handle bio, and there is 
something
wrong with floppy driver. I will post a patch to fix this floppy’s bug soon.

Thanks
Minfei

> On Jul 29, 2016, at 10:21, kernel test robot  wrote:
> 
> 
> FYI, we noticed the following commit:
> 
> https://github.com/0day-ci/linux 
> Minfei-Huang/blk-core-Fix-the-bad-IO-during-checking-bio/20160728-182758
> commit ee5c4fef9f2ef03ee8f283a5b24192df00e17f0f ("blk-core: Fix the bad IO 
> during checking bio")
> 
> in testcase: boot
> 
> on test machine: 2 threads qemu-system-i386 -enable-kvm with 320M memory
> 
> caused below changes:
> 
> 
> ++++
> || b013517951 | ee5c4fef9f |
> ++++
> | boot_successes | 11 | 2  |
> | boot_failures  | 1  | 10 |
> | BUG:kernel_test_crashed| 1  ||
> | BUG:unable_to_handle_kernel| 0  | 8  |
> | Oops   | 0  | 8  |
> | EIP_is_at__lock_acquire| 0  | 8  |
> | Kernel_panic-not_syncing:Fatal_exception   | 0  | 8  |
> | IP-Config:Auto-configuration_of_network_failed | 0  | 2  |
> ++++
> 
> 
> 
> [   24.378591] attempt to access beyond end of device
> [   24.378593] fd0: rw=0, want=8, limit=0
> [   24.378594] floppy: error -5 while reading block 0
> [   24.378600] BUG: unable to handle kernel NULL pointer dereference at 
> 010b
> [   24.378605] IP: [<7906d275>] __lock_acquire+0xa7/0x612
> [   24.378606] *pde =  
> [   24.378608] Oops: 0002 [#1] SMP
> [   24.378611] CPU: 1 PID: 574 Comm: mount Not tainted 
> 4.7.0-rc2-00241-gee5c4fe #4
> [   24.378612] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
> Debian-1.8.2-1 04/01/2014
> [   24.378614] task: 87152c80 ti: 883f task.ti: 883f
> [   24.378615] EIP: 0060:[<7906d275>] EFLAGS: 00010002 CPU: 1
> [   24.378617] EIP is at __lock_acquire+0xa7/0x612
> [   24.378618] EAX: 0007 EBX: 0002 ECX:  EDX: 
> [   24.378619] ESI: 0001 EDI: 87152c80 EBP: 883f1c2c ESP: 883f1c00
> [   24.378620]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
> [   24.378621] CR0: 80050033 CR2: 010b CR3: 0f8bd000 CR4: 0690
> [   24.378625] Stack:
> [   24.378630]   7a267440 0202 883f1c1c   
> 883f1d74 883f1c2c
> [   24.378634]  0002 87152c80 883f1d74 883f1c64 7906da8d  
> 0001 0001
> [   24.378637]   79066107     
> 883f1d64 0202
> [   24.378638] Call Trace:
> [   24.378640]  [<7906da8d>] lock_acquire+0x60/0x7c
> [   24.378644]  [<79066107>] ? complete+0x12/0x35
> [   24.378648]  [<79b9a42a>] _raw_spin_lock_irqsave+0x34/0x44
> [   24.378650]  [<79066107>] ? complete+0x12/0x35
> [   24.378651]  [<79066107>] complete+0x12/0x35
> [   24.378654]  [<79467b9a>] floppy_rb0_cb+0x31/0x38
> [   24.378656]  [<7932d102>] bio_endio+0x39/0x51
> [   24.378659]  [<7932ec47>] generic_make_request_checks+0x13a/0x144
> [   24.378661]  [<793300ae>] generic_make_request+0x11/0x12a
> [   24.378663]  [<79330293>] submit_bio+0xcc/0xd3
> [   24.378665]  [<79468347>] __floppy_read_block_0+0xbc/0xfe
> [   24.378668]  [<7906bfa3>] ? mark_held_locks+0x4b/0x65
> [   24.378671]  [<79b9a5de>] ? _raw_spin_unlock_irqrestore+0x39/0x4b
> [   24.378672]  [<79467b69>] ? floppy_find+0x3b/0x3b
> [   24.378674]  [<79468955>] floppy_revalidate+0x104/0x171
> [   24.378678]  [<79117276>] check_disk_change+0x41/0x4e
> [   24.378680]  [<79467e9a>] floppy_open+0x20c/0x28d
> [   24.378682]  [<7911697b>] __blkdev_get+0xf9/0x34f
> [   24.378684]  [<79116d39>] blkdev_get+0x168/0x25c
> [   24.378689]  [<790f8206>] ? path_put+0x15/0x18
> [   24.378691]  [<79117061>] ? lookup_bdev+0x62/0x72
> [   24.378693]  [<79117094>] blkdev_get_by_path+0x23/0x53
> [   24.378696]  [<790f2820>] mount_bdev+0x2a/0x157
> [   24.378700]  [<7917748a>] ext4_mount+0x10/0x12
> [   24.378702]  [<7917af40>] ? ext4_calculate_overhead+0x30e/0x30e
> [   24.378704]  [<790f2ad3>] mount_fs+0x53/0x110
> [   24.378708]  [<79107ab4>] vfs_kern_mount+0x47/0xaa
> [   24.378710]  [<79108d9b>] do_mount+0x7a6/0x8a6
> [   24.378714]  [<790c35c2>] ? strndup_user+0x27/0x3f
> [   24.378717]  [<79109040>] SyS_mount+0x52/0x76
> [   24.378720]  [<79000f2e>] do_int80_syscall_32+0x48/0x5a
> [   24.378722]  [<79b9ab2c>] entry_INT80_32+0x2c/0x2c
> [   24.378747] Code: 80 08 48 7a 74 03 8b 75 0c 83 fa 01 77 0b 8b 45 ec 8b 44 
> 90 04 85 c0 75 12 31 c9 8b 45 ec e8 8f cc ff ff 85 c0 0f 84 f2 04 00 00  
> ff 80 04 01 00 00 8b 9f 58 04 00

Re: [lkp] [blk] ee5c4fef9f: BUG: unable to handle kernel NULL pointer dereference at 0000010b

2016-07-29 Thread Minfei Huang 
Hi, Xiaolong.

I think it’s the correct behaviour for my patch to handle bio, and there is 
something
wrong with floppy driver. I will post a patch to fix this floppy’s bug soon.

Thanks
Minfei

> On Jul 29, 2016, at 10:21, kernel test robot  wrote:
> 
> 
> FYI, we noticed the following commit:
> 
> https://github.com/0day-ci/linux 
> Minfei-Huang/blk-core-Fix-the-bad-IO-during-checking-bio/20160728-182758
> commit ee5c4fef9f2ef03ee8f283a5b24192df00e17f0f ("blk-core: Fix the bad IO 
> during checking bio")
> 
> in testcase: boot
> 
> on test machine: 2 threads qemu-system-i386 -enable-kvm with 320M memory
> 
> caused below changes:
> 
> 
> ++++
> || b013517951 | ee5c4fef9f |
> ++++
> | boot_successes | 11 | 2  |
> | boot_failures  | 1  | 10 |
> | BUG:kernel_test_crashed| 1  ||
> | BUG:unable_to_handle_kernel| 0  | 8  |
> | Oops   | 0  | 8  |
> | EIP_is_at__lock_acquire| 0  | 8  |
> | Kernel_panic-not_syncing:Fatal_exception   | 0  | 8  |
> | IP-Config:Auto-configuration_of_network_failed | 0  | 2  |
> ++++
> 
> 
> 
> [   24.378591] attempt to access beyond end of device
> [   24.378593] fd0: rw=0, want=8, limit=0
> [   24.378594] floppy: error -5 while reading block 0
> [   24.378600] BUG: unable to handle kernel NULL pointer dereference at 
> 010b
> [   24.378605] IP: [<7906d275>] __lock_acquire+0xa7/0x612
> [   24.378606] *pde =  
> [   24.378608] Oops: 0002 [#1] SMP
> [   24.378611] CPU: 1 PID: 574 Comm: mount Not tainted 
> 4.7.0-rc2-00241-gee5c4fe #4
> [   24.378612] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
> Debian-1.8.2-1 04/01/2014
> [   24.378614] task: 87152c80 ti: 883f task.ti: 883f
> [   24.378615] EIP: 0060:[<7906d275>] EFLAGS: 00010002 CPU: 1
> [   24.378617] EIP is at __lock_acquire+0xa7/0x612
> [   24.378618] EAX: 0007 EBX: 0002 ECX:  EDX: 
> [   24.378619] ESI: 0001 EDI: 87152c80 EBP: 883f1c2c ESP: 883f1c00
> [   24.378620]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
> [   24.378621] CR0: 80050033 CR2: 010b CR3: 0f8bd000 CR4: 0690
> [   24.378625] Stack:
> [   24.378630]   7a267440 0202 883f1c1c   
> 883f1d74 883f1c2c
> [   24.378634]  0002 87152c80 883f1d74 883f1c64 7906da8d  
> 0001 0001
> [   24.378637]   79066107     
> 883f1d64 0202
> [   24.378638] Call Trace:
> [   24.378640]  [<7906da8d>] lock_acquire+0x60/0x7c
> [   24.378644]  [<79066107>] ? complete+0x12/0x35
> [   24.378648]  [<79b9a42a>] _raw_spin_lock_irqsave+0x34/0x44
> [   24.378650]  [<79066107>] ? complete+0x12/0x35
> [   24.378651]  [<79066107>] complete+0x12/0x35
> [   24.378654]  [<79467b9a>] floppy_rb0_cb+0x31/0x38
> [   24.378656]  [<7932d102>] bio_endio+0x39/0x51
> [   24.378659]  [<7932ec47>] generic_make_request_checks+0x13a/0x144
> [   24.378661]  [<793300ae>] generic_make_request+0x11/0x12a
> [   24.378663]  [<79330293>] submit_bio+0xcc/0xd3
> [   24.378665]  [<79468347>] __floppy_read_block_0+0xbc/0xfe
> [   24.378668]  [<7906bfa3>] ? mark_held_locks+0x4b/0x65
> [   24.378671]  [<79b9a5de>] ? _raw_spin_unlock_irqrestore+0x39/0x4b
> [   24.378672]  [<79467b69>] ? floppy_find+0x3b/0x3b
> [   24.378674]  [<79468955>] floppy_revalidate+0x104/0x171
> [   24.378678]  [<79117276>] check_disk_change+0x41/0x4e
> [   24.378680]  [<79467e9a>] floppy_open+0x20c/0x28d
> [   24.378682]  [<7911697b>] __blkdev_get+0xf9/0x34f
> [   24.378684]  [<79116d39>] blkdev_get+0x168/0x25c
> [   24.378689]  [<790f8206>] ? path_put+0x15/0x18
> [   24.378691]  [<79117061>] ? lookup_bdev+0x62/0x72
> [   24.378693]  [<79117094>] blkdev_get_by_path+0x23/0x53
> [   24.378696]  [<790f2820>] mount_bdev+0x2a/0x157
> [   24.378700]  [<7917748a>] ext4_mount+0x10/0x12
> [   24.378702]  [<7917af40>] ? ext4_calculate_overhead+0x30e/0x30e
> [   24.378704]  [<790f2ad3>] mount_fs+0x53/0x110
> [   24.378708]  [<79107ab4>] vfs_kern_mount+0x47/0xaa
> [   24.378710]  [<79108d9b>] do_mount+0x7a6/0x8a6
> [   24.378714]  [<790c35c2>] ? strndup_user+0x27/0x3f
> [   24.378717]  [<79109040>] SyS_mount+0x52/0x76
> [   24.378720]  [<79000f2e>] do_int80_syscall_32+0x48/0x5a
> [   24.378722]  [<79b9ab2c>] entry_INT80_32+0x2c/0x2c
> [   24.378747] Code: 80 08 48 7a 74 03 8b 75 0c 83 fa 01 77 0b 8b 45 ec 8b 44 
> 90 04 85 c0 75 12 31 c9 8b 45 ec e8 8f cc ff ff 85 c0 0f 84 f2 04 00 00  
> ff 80 04 01 00 00 8b 9f 58 04 00 00 89 5d e4 83 3d 08