Thanks Nilson, excellent find on the bugzilla report.
The linked linux-hardening thread makes me think this is 'just' an
undefined-but-safe operation: the sort of thing that's good to fix, in
case a future compiler makes an unsafe optimization, but not likely to
be a cause for concern today.
Thanks
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Information type changed from Private Security to Public Security
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https://bugs.launchpad.net/bugs/1996915
Title:
megaraid_sas crash in ubuntu 22.04
Status in linux package in Ubuntu:
Confirmed
Bug description:
crash message for dmesg
UBSAN: array-index-out-of-bounds in
/build/linux-JjvoxS/linux-5.15.0/drivers/scsi/megaraid/megaraid_sas_fp.c:151:32
index 2 is out of range for type 'MR_LD_SPAN_MAP [1]'
================================================================================
================================================================================
CPU: 16 PID: 330 Comm: kworker/16:1H Not tainted 5.15.0-53-generic #59-Ubuntu
Hardware name: GIGABYTE R282-Z91-00/MZ92-FS0-00, BIOS M10 11/23/2021
Workqueue: kblockd blk_mq_run_work_fn
Call Trace:
<TASK>
show_stack+0x52/0x5c
dump_stack_lvl+0x4a/0x63
dump_stack+0x10/0x16
ubsan_epilogue+0x9/0x49
__ubsan_handle_out_of_bounds.cold+0x44/0x49
MR_GetPhyParams+0x487/0x700 [megaraid_sas]
MR_BuildRaidContext+0x71e/0xb50 [megaraid_sas]
? cpumask_next_and+0x24/0x30
? update_sg_lb_stats+0x78/0x580
megasas_build_ldio_fusion+0x5b9/0x9a0 [megaraid_sas]
megasas_build_io_fusion+0x412/0x450 [megaraid_sas]
megasas_build_and_issue_cmd_fusion+0xa5/0x380 [megaraid_sas]
megasas_queue_command+0x1c1/0x200 [megaraid_sas]
? ktime_get+0x46/0xc0
scsi_dispatch_cmd+0x96/0x200
scsi_queue_rq+0x2d5/0x690
blk_mq_dispatch_rq_list+0x13f/0x680
? sbitmap_get+0x71/0xe0
__blk_mq_do_dispatch_sched+0xba/0x2e0
blk_mq_do_dispatch_sched+0x40/0x70
__blk_mq_sched_dispatch_requests+0x105/0x150
blk_mq_sched_dispatch_requests+0x35/0x70
__blk_mq_run_hw_queue+0x34/0xc0
blk_mq_run_work_fn+0x1f/0x30
process_one_work+0x22b/0x3d0
worker_thread+0x53/0x420
? process_one_work+0x3d0/0x3d0
kthread+0x12a/0x150
? set_kthread_struct+0x50/0x50
ret_from_fork+0x22/0x30
</TASK>
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