Processes were hung in aio context when one of the paths to the LUN was lost.

Issue

• Processes were hung in aio context when one of the paths to the LUN was lost. For database cluster nodes, this could cause eviction of one of the nodes.

[31714012.691250] INFO: task ora_lgwr_oexsdb:12586 blocked for more than 120 seconds.
[31714012.691254]       Tainted: P           OE    --------- -  - 4.18.0-193.el8.x86_64 #1
[31714012.691254] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[31714012.691255] ora_lgwr_oexsdb D    0 12586      1 0x80000000
[31714012.691257] Call Trace:
[31714012.691267]  ? __schedule+0x24f/0x650
[31714012.691269]  ? __switch_to_asm+0x35/0x70
[31714012.691270]  schedule+0x2f/0xa0
[31714012.691271]  schedule_timeout+0x20d/0x310
[31714012.691273]  ? __switch_to_asm+0x41/0x70
[31714012.691278]  ? __kfifo_from_user_r+0xb0/0xb0
[31714012.691279]  ? __percpu_ref_switch_mode+0xd4/0x180
[31714012.691285]  ? __wake_up_common_lock+0x89/0xc0
[31714012.691286]  wait_for_completion+0x11f/0x190
[31714012.691290]  ? wake_up_q+0x70/0x70
[31714012.691293]  exit_aio+0xdc/0xf0
[31714012.691297]  mmput+0x28/0x130
[31714012.691301]  do_exit+0x287/0xb40
[31714012.691305]  ? __do_page_fault+0x24c/0x4e0
[31714012.691307]  do_group_exit+0x3a/0xa0
[31714012.691308]  __x64_sys_exit_group+0x14/0x20
[31714012.691313]  do_syscall_64+0x5b/0x1a0
[31714012.691315]  entry_SYSCALL_64_after_hwframe+0x65/0xca
[31714012.691316] RIP: 0033:0x7ffff3927506

[31714246.156805] device-mapper: multipath: Failing path 71:0.
[31714246.322353] sysrq: SysRq : Trigger a crash
[31714246.322360] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
[31714246.322361] PGD 0 P4D 0 
[31714246.322363] Oops: 0002 [#1] SMP NOPTI
[31714246.322365] CPU: 3 PID: 8424 Comm: cssdagent Kdump: loaded Tainted: P           OE    --------- -  - 4.18.0-193.el8.x86_64 #1
[31714246.322367] Hardware name: HPE ProLiant DL580 Gen10/ProLiant DL580 Gen10, BIOS U34 05/24/2021
[31714246.322371] RIP: 0010:sysrq_handle_crash+0x12/0x20
[31714246.322373] Code: 54 f1 c4 ff 48 89 df e8 7c fb ff ff e9 9c fe ff ff 90 90 90 90 90 90 90 0f 1f 44 00 00 c7 05 fd 02 d2 00 01 00 00 00 0f ae f8 <c6> 04 25 00 00 00 00 01 c3 0f 1f 44 00 00 0f 1f 44 00 00 bf 01 00
[31714246.322374] sysrq: SysRq : Trigger a crash
[31714246.322376] RSP: 0018:ffffaba16c50fe78 EFLAGS: 00010246
[31714246.322377] RAX: ffffffff9ad24300 RBX: 0000000000000063 RCX: 0000000000000000
[31714246.322378] RDX: 0000000000000000 RSI: ffff9661ff4d6a08 RDI: 0000000000000063
[31714246.322379] RBP: 0000000000000004 R08: 0000000000002681 R09: 0000000000000030
[31714246.322380] R10: 0000000000000000 R11: ffffaba16c50fd30 R12: 0000000000000000
[31714246.322380] R13: 0000000000000000 R14: ffffffff9bb3c0a0 R15: 0000000000000000
[31714246.322382] FS:  00007fffed03e700(0000) GS:ffff9661ff4c0000(0000) knlGS:0000000000000000
[31714246.322383] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[31714246.322383] CR2: 0000000000000000 CR3: 00000020e07a6001 CR4: 00000000007606e0
[31714246.322384] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[31714246.322385] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[31714246.322386] PKRU: 55555554
[31714246.322386] Call Trace:
[31714246.322389]  __handle_sysrq.cold.9+0x48/0xfb
[31714246.322392]  write_sysrq_trigger+0x2b/0x30
[31714246.322398]  proc_reg_write+0x3c/0x60
[31714246.322403]  vfs_write+0xa5/0x1a0
[31714246.322405]  ksys_write+0x4f/0xb0
[31714246.322410]  do_syscall_64+0x5b/0x1a0
[31714246.322415]  entry_SYSCALL_64_after_hwframe+0x65/0xca