kernel BUG at ../drivers/md/bcache/bset.c:884
This document (000020355) is provided subject to the disclaimer at the end of this document.
The following was seen in /var/log/messages:
xy1d kernel: [721646.767939] ------------[ cut here ]------------ xy1d kernel: [721646.767942] kernel BUG at ../drivers/md/bcache/bset.c:884! xy1d kernel: [721646.767950] invalid opcode: 0000 [#1] SMP NOPTI xy1d kernel: [721646.767962] CPU: 309 PID: 217475 Comm: SubmitThread-DA Tainted: G L X 5.3.18-24.52-default #1 SLE15-SP2 xy1d kernel: [721646.767966] Hardware name: Inspur TS860M5/YZCP-00916-101, BIOS 4.1.16 09/10/2020 xy1d kernel: [721646.767989] RIP: 0010:bch_btree_insert_key+0x28c/0x2b0 [bcache]
In addition SAP HANA hung during shutdown process.
Currently it was only seen on the hardware mentioned above. Other hardware may be affected, too.
On SLES15SP2 this issue is fixed with kernel-default-5.3.18-24.78.1.
If a reboot is not possible immediately kernel-livepatch-SLE15-SP2_Update_18-1-5.3.1 may be installed (requires extra Kernel Livepatching Subscription)SLES15 SP3 was released with a fixed kernel.
The systemd unit mentioned below may still be required.
This is caused by a race condition where the bcache device vanishes before the cache is written back completely. This leads to cache corruption and bcache needs to be reinitialized before next usage.
Upstream bug pending.
To mitigate SUSE Technical Support can provide a systemd unit to stop bcache safely before reboot. This can also be shared upon request.
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- Document ID:000020355
- Creation Date: 14-Dec-2021
- Modified Date:14-Dec-2021
- SUSE Linux Enterprise Server for SAP Applications
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