IB/hfi1: Close window for pq and request coliding
Cleaning up a pq can result in the following warning and panic:
WARNING: CPU: 52 PID: 77418 at lib/list_debug.c:53 __list_del_entry+0x63/0xd0
list_del corruption,
ffff88cb2c6ac068->next is LIST_POISON1 (
dead000000000100)
Modules linked in: mmfs26(OE) mmfslinux(OE) tracedev(OE) 8021q garp mrp ib_isert iscsi_target_mod target_core_mod crc_t10dif crct10dif_generic opa_vnic rpcrdma ib_iser libiscsi scsi_transport_iscsi ib_ipoib(OE) bridge stp llc iTCO_wdt iTCO_vendor_support intel_powerclamp coretemp intel_rapl iosf_mbi kvm_intel kvm irqbypass crct10dif_pclmul crct10dif_common crc32_pclmul ghash_clmulni_intel ast aesni_intel ttm lrw gf128mul glue_helper ablk_helper drm_kms_helper cryptd syscopyarea sysfillrect sysimgblt fb_sys_fops drm pcspkr joydev lpc_ich mei_me drm_panel_orientation_quirks i2c_i801 mei wmi ipmi_si ipmi_devintf ipmi_msghandler nfit libnvdimm acpi_power_meter acpi_pad hfi1(OE) rdmavt(OE) rdma_ucm ib_ucm ib_uverbs ib_umad rdma_cm ib_cm iw_cm ib_core binfmt_misc numatools(OE) xpmem(OE) ip_tables
nfsv3 nfs_acl nfs lockd grace sunrpc fscache igb ahci i2c_algo_bit libahci dca ptp libata pps_core crc32c_intel [last unloaded: i2c_algo_bit]
CPU: 52 PID: 77418 Comm: pvbatch Kdump: loaded Tainted: G OE ------------ 3.10.0-957.38.3.el7.x86_64 #1
Hardware name: HPE.COM HPE SGI 8600-XA730i Gen10/X11DPT-SB-SG007, BIOS SBED1229 01/22/2019
Call Trace:
[<
ffffffff90365ac0>] dump_stack+0x19/0x1b
[<
ffffffff8fc98b78>] __warn+0xd8/0x100
[<
ffffffff8fc98bff>] warn_slowpath_fmt+0x5f/0x80
[<
ffffffff8ff970c3>] __list_del_entry+0x63/0xd0
[<
ffffffff8ff9713d>] list_del+0xd/0x30
[<
ffffffff8fddda70>] kmem_cache_destroy+0x50/0x110
[<
ffffffffc0328130>] hfi1_user_sdma_free_queues+0xf0/0x200 [hfi1]
[<
ffffffffc02e2350>] hfi1_file_close+0x70/0x1e0 [hfi1]
[<
ffffffff8fe4519c>] __fput+0xec/0x260
[<
ffffffff8fe453fe>] ____fput+0xe/0x10
[<
ffffffff8fcbfd1b>] task_work_run+0xbb/0xe0
[<
ffffffff8fc2bc65>] do_notify_resume+0xa5/0xc0
[<
ffffffff90379134>] int_signal+0x12/0x17
BUG: unable to handle kernel NULL pointer dereference at
0000000000000010
IP: [<
ffffffff8fe1f93e>] kmem_cache_close+0x7e/0x300
PGD
2cdab19067 PUD
2f7bfdb067 PMD 0
Oops: 0000 [#1] SMP
Modules linked in: mmfs26(OE) mmfslinux(OE) tracedev(OE) 8021q garp mrp ib_isert iscsi_target_mod target_core_mod crc_t10dif crct10dif_generic opa_vnic rpcrdma ib_iser libiscsi scsi_transport_iscsi ib_ipoib(OE) bridge stp llc iTCO_wdt iTCO_vendor_support intel_powerclamp coretemp intel_rapl iosf_mbi kvm_intel kvm irqbypass crct10dif_pclmul crct10dif_common crc32_pclmul ghash_clmulni_intel ast aesni_intel ttm lrw gf128mul glue_helper ablk_helper drm_kms_helper cryptd syscopyarea sysfillrect sysimgblt fb_sys_fops drm pcspkr joydev lpc_ich mei_me drm_panel_orientation_quirks i2c_i801 mei wmi ipmi_si ipmi_devintf ipmi_msghandler nfit libnvdimm acpi_power_meter acpi_pad hfi1(OE) rdmavt(OE) rdma_ucm ib_ucm ib_uverbs ib_umad rdma_cm ib_cm iw_cm ib_core binfmt_misc numatools(OE) xpmem(OE) ip_tables
nfsv3 nfs_acl nfs lockd grace sunrpc fscache igb ahci i2c_algo_bit libahci dca ptp libata pps_core crc32c_intel [last unloaded: i2c_algo_bit]
CPU: 52 PID: 77418 Comm: pvbatch Kdump: loaded Tainted: G W OE ------------ 3.10.0-957.38.3.el7.x86_64 #1
Hardware name: HPE.COM HPE SGI 8600-XA730i Gen10/X11DPT-SB-SG007, BIOS SBED1229 01/22/2019
task:
ffff88cc26db9040 ti:
ffff88b5393a8000 task.ti:
ffff88b5393a8000
RIP: 0010:[<
ffffffff8fe1f93e>] [<
ffffffff8fe1f93e>] kmem_cache_close+0x7e/0x300
RSP: 0018:
ffff88b5393abd60 EFLAGS:
00010287
RAX:
0000000000000000 RBX:
ffff88cb2c6ac000 RCX:
0000000000000003
RDX:
0000000000000400 RSI:
0000000000000400 RDI:
ffffffff9095b800
RBP:
ffff88b5393abdb0 R08:
ffffffff9095b808 R09:
ffffffff8ff77c19
R10:
ffff88b73ce1f160 R11:
ffffddecddde9800 R12:
ffff88cb2c6ac000
R13:
000000000000000c R14:
ffff88cf3fdca780 R15:
0000000000000000
FS:
00002aaaaab52500(0000) GS:
ffff88b73ce00000(0000) knlGS:
0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
CR2:
0000000000000010 CR3:
0000002d27664000 CR4:
00000000007607e0
DR0:
0000000000000000 DR1:
0000000000000000 DR2:
0000000000000000
DR3:
0000000000000000 DR6:
00000000fffe0ff0 DR7:
0000000000000400
PKRU:
55555554
Call Trace:
[<
ffffffff8fe20d44>] __kmem_cache_shutdown+0x14/0x80
[<
ffffffff8fddda78>] kmem_cache_destroy+0x58/0x110
[<
ffffffffc0328130>] hfi1_user_sdma_free_queues+0xf0/0x200 [hfi1]
[<
ffffffffc02e2350>] hfi1_file_close+0x70/0x1e0 [hfi1]
[<
ffffffff8fe4519c>] __fput+0xec/0x260
[<
ffffffff8fe453fe>] ____fput+0xe/0x10
[<
ffffffff8fcbfd1b>] task_work_run+0xbb/0xe0
[<
ffffffff8fc2bc65>] do_notify_resume+0xa5/0xc0
[<
ffffffff90379134>] int_signal+0x12/0x17
Code: 00 00 ba 00 04 00 00 0f 4f c2 3d 00 04 00 00 89 45 bc 0f 84 e7 01 00 00 48 63 45 bc 49 8d 04 c4 48 89 45 b0 48 8b 80 c8 00 00 00 <48> 8b 78 10 48 89 45 c0 48 83 c0 10 48 89 45 d0 48 8b 17 48 39
RIP [<
ffffffff8fe1f93e>] kmem_cache_close+0x7e/0x300
RSP <
ffff88b5393abd60>
CR2:
0000000000000010
The panic is the result of slab entries being freed during the destruction
of the pq slab.
The code attempts to quiesce the pq, but looking for n_req == 0 doesn't
account for new requests.
Fix the issue by using SRCU to get a pq pointer and adjust the pq free
logic to NULL the fd pq pointer prior to the quiesce.
Fixes:
e87473bc1b6c ("IB/hfi1: Only set fd pointer when base context is completely initialized")
Link: https://lore.kernel.org/r/20200210131033.87408.81174.stgit@awfm-01.aw.intel.com
Reviewed-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>