110 lines
5.0 KiB
Diff
110 lines
5.0 KiB
Diff
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From 533d39a6862638f587b231ecf541ab1f5c8e85f9 Mon Sep 17 00:00:00 2001
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Date: Fri, 16 Aug 2024 08:26:34 +0100
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Subject: [PATCH] appliance/init: Don't set impossible "noop" disk scheduler
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Since RHEL 7.4, the noop scheduler is no longer a thing. Trying to
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set it results in the error:
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+ echo noop
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/init: line 108: echo: write error: Invalid argument
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The current recommendation (https://access.redhat.com/solutions/5427)
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is to use mq-deadline, but that's also the default so we don't have to
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do anything.
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A bigger reason to remove these lines is that kernel 6.11.0 has
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introduced a hang where -- rarely -- the ext4 filesystem hangs if you
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try to change the scheduler while handing a page fault, even if you're
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setting a scheduler that doesn't exist. I couldn't get much detail
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except for a couple of stack traces from different VMs:
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crash> set 234
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PID: 234
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COMMAND: "modprobe"
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TASK: ffff9f5ec3a22f40 [THREAD_INFO: ffff9f5ec3a22f40]
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CPU: 0
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STATE: TASK_UNINTERRUPTIBLE
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crash> bt
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PID: 234 TASK: ffff9f5ec3a22f40 CPU: 0 COMMAND: "modprobe"
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#0 [ffffb21e002e7840] __schedule at ffffffffa718f6d0
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#1 [ffffb21e002e78f8] schedule at ffffffffa7190a27
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#2 [ffffb21e002e7908] __bio_queue_enter at ffffffffa67e121c
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#3 [ffffb21e002e7968] blk_mq_submit_bio at ffffffffa67f358c
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#4 [ffffb21e002e79f0] __submit_bio at ffffffffa67e1e3c
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#5 [ffffb21e002e7a58] submit_bio_noacct_nocheck at ffffffffa67e2326
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#6 [ffffb21e002e7ac0] ext4_mpage_readpages at ffffffffa65ceafc
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#7 [ffffb21e002e7be0] read_pages at ffffffffa6381d17
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#8 [ffffb21e002e7c40] page_cache_ra_unbounded at ffffffffa6381ff5
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#9 [ffffb21e002e7ca8] filemap_fault at ffffffffa63761b5
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#10 [ffffb21e002e7d48] __do_fault at ffffffffa63d1892
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#11 [ffffb21e002e7d70] do_fault at ffffffffa63d2425
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#12 [ffffb21e002e7da0] __handle_mm_fault at ffffffffa63d8c6b
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#13 [ffffb21e002e7e88] handle_mm_fault at ffffffffa63d95c2
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#14 [ffffb21e002e7ec8] do_user_addr_fault at ffffffffa60b34ea
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#15 [ffffb21e002e7f28] exc_page_fault at ffffffffa7186e4e
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#16 [ffffb21e002e7f50] asm_exc_page_fault at ffffffffa72012a6
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RIP: 000055d16159f8d8 RSP: 00007ffdd4c1f340 RFLAGS: 00010206
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RAX: 00000000000bec82 RBX: 00007ff2fd00dc82 RCX: 000055d1615b492a
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RDX: 00007ffdd4c216b0 RSI: 00000000200bec82 RDI: 000055d185725960
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RBP: 00007ffdd4c1f5a0 R8: 0000000000000000 R9: 0000000000000000
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R10: 0000000000000000 R11: 0000000000000202 R12: 00000000200bec82
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R13: 000055d185725960 R14: 00007ffdd4c216b0 R15: 000055d1615b9708
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ORIG_RAX: ffffffffffffffff CS: 0033 SS: 002b
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crash> set 230
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PID: 230
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COMMAND: "modprobe"
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TASK: ffff98ce03ca3040 [THREAD_INFO: ffff98ce03ca3040]
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CPU: 0
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STATE: TASK_UNINTERRUPTIBLE
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crash> bt
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PID: 230 TASK: ffff98ce03ca3040 CPU: 0 COMMAND: "modprobe"
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#0 [ffffaf9940307840] __schedule at ffffffff9618f6d0
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#1 [ffffaf99403078f8] schedule at ffffffff96190a27
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#2 [ffffaf9940307908] __bio_queue_enter at ffffffff957e121c
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#3 [ffffaf9940307968] blk_mq_submit_bio at ffffffff957f358c
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#4 [ffffaf99403079f0] __submit_bio at ffffffff957e1e3c
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#5 [ffffaf9940307a58] submit_bio_noacct_nocheck at ffffffff957e2326
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#6 [ffffaf9940307ac0] ext4_mpage_readpages at ffffffff955ceafc
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#7 [ffffaf9940307be0] read_pages at ffffffff95381d1a
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#8 [ffffaf9940307c40] page_cache_ra_unbounded at ffffffff95381ff5
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#9 [ffffaf9940307ca8] filemap_fault at ffffffff953761b5
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#10 [ffffaf9940307d48] __do_fault at ffffffff953d1895
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#11 [ffffaf9940307d70] do_fault at ffffffff953d2425
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#12 [ffffaf9940307da0] __handle_mm_fault at ffffffff953d8c6b
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#13 [ffffaf9940307e88] handle_mm_fault at ffffffff953d95c2
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#14 [ffffaf9940307ec8] do_user_addr_fault at ffffffff950b34ea
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#15 [ffffaf9940307f28] exc_page_fault at ffffffff96186e4e
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#16 [ffffaf9940307f50] asm_exc_page_fault at ffffffff962012a6
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RIP: 0000556b7a7468d8 RSP: 00007ffde2ffb560 RFLAGS: 00000206
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RAX: 00000000000bec82 RBX: 00007f5331a0dc82 RCX: 0000556b7a75b92a
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RDX: 00007ffde2ffd8d0 RSI: 00000000200bec82 RDI: 0000556ba8edf960
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RBP: 00007ffde2ffb7c0 R8: 0000000000000000 R9: 0000000000000000
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R10: 0000000000000000 R11: 0000000000000202 R12: 00000000200bec82
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R13: 0000556ba8edf960 R14: 00007ffde2ffd8d0 R15: 0000556b7a760708
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ORIG_RAX: ffffffffffffffff CS: 0033 SS: 002b
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Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=2303267
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(cherry picked from commit b2d682a4730ead8b4ae07e5aaf6fa230c5eec305)
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---
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appliance/init | 2 --
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1 file changed, 2 deletions(-)
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diff --git a/appliance/init b/appliance/init
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index 128a3c20e..dae06dbbe 100755
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--- a/appliance/init
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+++ b/appliance/init
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@@ -104,8 +104,6 @@ udevadm settle --timeout=600
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# Increase the SCSI timeout so we can read remote images.
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shopt -s nullglob
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for f in /sys/block/sd*/device/timeout; do echo 300 > $f; done
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-# https://access.redhat.com/site/solutions/5427
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-for f in /sys/block/{h,s,ub,v}d*/queue/scheduler; do echo noop > $f; done
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shopt -u nullglob
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# Set up the network.
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--
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2.43.0
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