** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Cosmic)
Importance: Critical
Assignee: Canonical Kernel Team (canonical-kernel-team)
Status: Triaged
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => Critical
** Changed in: linux (Ubuntu Bionic)
Status: New => In Progress
** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1777716
Title:
[SRU Bionic][Cosmic] kernel panic in ipmi_ssif at msg_done_handler
Status in linux package in Ubuntu:
Triaged
Status in linux source package in Bionic:
Fix Committed
Status in linux source package in Cosmic:
Triaged
Bug description:
[Impact]
When you boot bionic with Boot with i2c and ipmi_ssif enabled on Cavium
ThunderX2 systems with a faulty BMC that does not return any data, and the code
is trying to print the value if data[2], we get a kernel panic.
[ 484.728410] Unable to handle kernel NULL pointer dereference at virtual
address 00000002
[ 484.736496] pgd = ffff0000094a2000
[ 484.739885] [00000002] *pgd=00000047fcffe003, *pud=00000047fcffd003,
*pmd=0000000000000000
[ 484.748158] Internal error: Oops: 96000005 [#1] SMP
[...]
[ 485.101451] Call trace:
[...]
[ 485.188473] [<ffff000000a46e68>] msg_done_handler+0x668/0x700 [ipmi_ssif]
[ 485.195249] [<ffff000000a456b8>] ipmi_ssif_thread+0x110/0x128 [ipmi_ssif]
[ 485.202038] [<ffff0000080f1430>] kthread+0x108/0x138
[ 485.206994] [<ffff0000080838e0>] ret_from_fork+0x10/0x30
[ 485.212294] Code: aa1903e1 aa1803e0 b900227f 95fef6a5 (39400aa3)
[Test]
- System with faulty BMC
- Boot with i2c and ipmi_ssif enabled.
[Fix]
Fixed upstream with:
commit f002612b9d86613bc6fde0a444e0095225f6053e
Author: Kamlakant Patel <[email protected]>
Date: Tue Mar 13 16:32:27 2018 +0530
ipmi_ssif: Fix kernel panic at msg_done_handler
[Regression Potential]
ipmi_ssif is only loaded on ARM64 systems, this issue is observed only on
Cavium ThunderX2 systems with a faulty BMC. The fix does not impact other
architectures or vendor systems. Regression potential is low.
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