Re: Bug_ON with patch: bio: modify __bio_add_page() to accept pages that don't start a new segment
From: Maurizio Lombardi
Date: Tue Jul 15 2014 - 07:38:54 EST
On 07/15/2014 10:14 AM, Mike Qiu wrote:
> My Power7 box boot fail with commit:
>
> 254c4407cb84a6dec90336054615b0f0e996bb7c
> bio: modify __bio_add_page() to accept pages that don't start a new segment
>
> Just revert it will works for me.
This looks strange to me because, even after reverting my patch, the kernel still panics
with a different call trace:
[ 68.999477] BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
[ 69.007411] IP: [<ffffffff81322238>] blk_throtl_drain+0x28/0x110
[ 69.013510] PGD 222e5f067 PUD 21bdab067 PMD 0
[ 69.018051] Oops: 0000 [#1] SMP
[ 69.021335] Modules linked in: serpent_avx_x86_64 serpent_sse2_x86_64 serpent_generic dm_crypt loop iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi cfg80211 rfkill x86_pkg_temp_thermal coretemp kvm_intel bnx2x kvm crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel e1000e tpm_infineon ptp iTCO_wdt pcspkr iTCO_vendor_support tpm_tis pps_core microcode ipmi_si serio_raw i2c_i801 ipmi_msghandler mdio tpm ie31200_edac video lpc_ich mfd_core shpchp edac_core xfs libcrc32c ast i2c_algo_bit drm_kms_helper ttm drm ata_generic pata_acpi
[ 69.070767] CPU: 3 PID: 11130 Comm: cryptsetup Not tainted 3.16.0-rc5-next-20140714+ #2
[ 69.078862] Hardware name: wortmann To be filled by O.E.M./P8B-M Series, BIOS 6103 12/06/2012
[ 69.087413] task: ffff8802225c0930 ti: ffff88021bda0000 task.ti: ffff88021bda0000
[ 69.094977] RIP: 0010:[<ffffffff81322238>] [<ffffffff81322238>] blk_throtl_drain+0x28/0x110
[ 69.103529] RSP: 0018:ffff88021bda3b60 EFLAGS: 00010046
[ 69.108866] RAX: 0000000000000000 RBX: ffff880222001638 RCX: 000000007fffffff
[ 69.116110] RDX: 000000000000000b RSI: 0000000000000000 RDI: 0000000000000000
[ 69.123337] RBP: ffff88021bda3b78 R08: 0000000000000000 R09: ffff8800c9011ff0
[ 69.130562] R10: ffff88021bda3b78 R11: ffffffff8132fd61 R12: ffff880222001638
[ 69.137764] R13: ffff88021c84e600 R14: ffff880222001c30 R15: 0000000000000000
[ 69.144981] FS: 00007f81fd8fb840(0000) GS:ffff88022fd80000(0000) knlGS:0000000000000000
[ 69.153144] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 69.158931] CR2: 0000000000000028 CR3: 000000021bdac000 CR4: 00000000000407e0
[ 69.166131] Stack:
[ 69.168160] ffff880222001638 0000000000000000 ffff880222001c40 ffff88021bda3b88
[ 69.175671] ffffffff8131f36e ffff88021bda3bb8 ffffffff8130294e ffff880222001638
[ 69.183182] ffffffff819c9580 ffff880222001638 ffff88021af91800 ffff88021bda3bd0
[ 69.190740] Call Trace:
[ 69.193218] [<ffffffff8131f36e>] blkcg_drain_queue+0xe/0x10
[ 69.198921] [<ffffffff8130294e>] __blk_drain_queue+0x6e/0x150
[ 69.204804] [<ffffffff81302a8d>] blk_queue_bypass_start+0x5d/0x80
[ 69.211050] [<ffffffff8131e668>] blkcg_deactivate_policy+0x38/0x120
[ 69.217437] [<ffffffff81322454>] blk_throtl_exit+0x34/0x50
[ 69.223094] [<ffffffff8131f3aa>] blkcg_exit_queue+0x3a/0x40
[ 69.228822] [<ffffffff81305ee6>] blk_release_queue+0x26/0xe0
[ 69.234600] [<ffffffff8132fd47>] kobject_cleanup+0x77/0x1b0
[ 69.240345] [<ffffffff8132fbf8>] kobject_put+0x28/0x60
[ 69.245596] [<ffffffff81302b9b>] blk_cleanup_queue+0xeb/0x120
[ 69.251464] [<ffffffff81546cb1>] __dm_destroy+0x1d1/0x250
[ 69.257043] [<ffffffff81547a53>] dm_destroy+0x13/0x20
[ 69.262265] [<ffffffff8154d1fe>] dev_remove+0x11e/0x180
[ 69.267614] [<ffffffff8154d0e0>] ? dev_suspend+0x250/0x250
[ 69.273269] [<ffffffff8154d8d6>] ctl_ioctl+0x246/0x4e0
[ 69.278549] [<ffffffff8154db83>] dm_ctl_ioctl+0x13/0x20
[ 69.283920] [<ffffffff811e08d8>] do_vfs_ioctl+0x2d8/0x4b0
[ 69.289458] [<ffffffff811e0b31>] SyS_ioctl+0x81/0xa0
[ 69.294544] [<ffffffff811166b6>] ? __audit_syscall_exit+0x236/0x2e0
[ 69.300964] [<ffffffff816d5369>] system_call_fastpath+0x16/0x1b
[ 69.307020] Code: 00 00 00 66 66 66 66 90 55 48 89 e5 41 55 41 54 49 89 fc 53 4c 8b af e0 06 00 00 49 8b 85 88 00 00 00 31 ff 48 8b 80 68 05 00 00 <48> 8b 70 28 e8 3f 44 de ff 48 85 c0 48 89 c3 74 61 0f 1f 80 00
[ 69.327190] RIP [<ffffffff81322238>] blk_throtl_drain+0x28/0x110
[ 69.333402] RSP <ffff88021bda3b60>
[ 69.336937] CR2: 0000000000000028
[ 69.340275] ---[ end trace 3c89b44a6f5a2b9f ]---
Regards,
Maurizio Lombardi
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