group.of.nepali.translators team mailing list archive

[Stefan Bader <1995870@xxxxxxxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: linux-hwe (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: linux-hwe (Ubuntu Bionic)
       Status: New => Invalid

** Changed in: linux-hwe (Ubuntu Xenial)
   Importance: Undecided => Medium

** Changed in: linux-hwe (Ubuntu Xenial)
       Status: New => Fix Committed

** Changed in: linux (Ubuntu Xenial)
       Status: New => Invalid

** Changed in: linux (Ubuntu)
       Status: New => Invalid

** Changed in: linux (Ubuntu Bionic)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu Bionic)
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1995870

Title:
  BUG: scheduling while atomic: ip/1210/0x00000200 on xenial/hwe rumford

Status in linux package in Ubuntu:
  Invalid
Status in linux-hwe package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  Invalid
Status in linux-hwe source package in Xenial:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed
Status in linux-hwe source package in Bionic:
  Invalid

Bug description:
  [Impact]

  There were BUG: scheduling while atomic: ip/1210/0x00000200 appearing
  on xenial/hwe with the tg3 ethernet driver when running on rumford instance.
  Probably some performace degradation as the driver was trying to sleep while
  holding a spinlock.
  There also was cluttering of the kernel log with stack traces.

  [Fix]

  Change usleep_range -> udelay which is safe to call from atomic
  contexts.

  [Test]

  Compile tested only. Should see this resolved in the next cycle on
  xenial/hwe rumford instance.

  [Where problems could occur]

  Not much regression potential as the correct delay call is now being
  called.

  
  --------------------------------------------------------------------------

  There is a bug being triggered on a usleep within the tg3 driver with
  xenial/linux-hwe 4.15.0-197.208~16.04.1 on rumford.

  This has been observed in multiple cycles during boot-testing.

  [   27.437584] BUG: scheduling while atomic: ip/1210/0x00000200
  [   27.468440] Modules linked in: nls_iso8859_1 intel_rapl sb_edac x86_pkg_temp_thermal intel_powerclamp coretemp ipmi_ssif kvm_intel hpilo kvm irqbypass intel_cstate shpchp ioatdma dca intel_rapl_perf ipmi_si ipmi_devintf lpc_ich ipmi_msghandler acpi_power_meter mac_hid ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear mgag200 i2c_algo_bit ses crct10dif_pclmul enclosure crc32_pclmul ttm ghash_clmulni_intel drm_kms_helper mlx5_core pcbc syscopyarea aesni_intel mlxfw sysfillrect sysimgblt aes_x86_64 fb_sys_fops tg3 devlink crypto_simd hpsa nvme glue_helper ptp drm cryptd pps_core nvme_core scsi_transport_sas wmi
  [   27.468491] CPU: 1 PID: 1210 Comm: ip Not tainted 4.15.0-197-generic #208~16.04.1-Ubuntu
  [   27.468493] Hardware name: HP ProLiant DL360 Gen9/ProLiant DL360 Gen9, BIOS P89 05/21/2018
  [   27.468494] Call Trace:
  [   27.468508]  dump_stack+0x6d/0x8b
  [   27.468515]  __schedule_bug+0x54/0x70
  [   27.468519]  __schedule+0x635/0x8b0
  [   27.468522]  schedule+0x36/0x80
  [   27.468527]  schedule_hrtimeout_range_clock+0xbc/0x1b0
  [   27.468532]  ? __hrtimer_init+0x90/0x90
  [   27.468536]  schedule_hrtimeout_range+0x13/0x20
  [   27.468539]  usleep_range+0x62/0x90
  [   27.468547]  tg3_ape_event_lock+0x36/0xa0 [tg3]
  [   27.468552]  tg3_ape_driver_state_change.part.69+0xc6/0x160 [tg3]
  [   27.468557]  tg3_start+0xebc/0x10b0 [tg3]
  [   27.468563]  tg3_open+0x130/0x280 [tg3]
  [   27.468568]  __dev_open+0xd7/0x150
  [   27.468572]  __dev_change_flags+0x186/0x1c0
  [   27.468575]  dev_change_flags+0x29/0x70
  [   27.468580]  do_setlink+0x355/0xd90
  [   27.468589]  ? nla_parse+0xa7/0x120
  [   27.468592]  rtnl_newlink+0x773/0x8f0
  [   27.468597]  ? do_anonymous_page+0x24b/0x430
  [   27.468605]  ? ns_capable_common+0x2b/0x50
  [   27.468608]  ? ns_capable+0x10/0x20
  [   27.468612]  rtnetlink_rcv_msg+0x205/0x290
  [   27.468615]  ? _cond_resched+0x1a/0x50
  [   27.468620]  ? __kmalloc_node_track_caller+0x201/0x2c0
  [   27.468623]  ? rtnl_calcit.isra.25+0x100/0x100
  [   27.468627]  netlink_rcv_skb+0xd9/0x110
  [   27.468630]  rtnetlink_rcv+0x15/0x20
  [   27.468633]  netlink_unicast+0x198/0x260
  [   27.468637]  netlink_sendmsg+0x2ea/0x410
  [   27.468640]  sock_sendmsg+0x3e/0x50
  [   27.468642]  ___sys_sendmsg+0x2e9/0x300
  [   27.468646]  ? lru_cache_add_active_or_unevictable+0x36/0xb0
  [   27.468649]  ? do_anonymous_page+0x24b/0x430
  [   27.468653]  ? __handle_mm_fault+0xae7/0xc80
  [   27.468657]  __sys_sendmsg+0x54/0x90
  [   27.468659]  ? __sys_sendmsg+0x54/0x90
  [   27.468662]  SyS_sendmsg+0x12/0x20
  [   27.468667]  do_syscall_64+0x73/0x130
  [   27.468670]  entry_SYSCALL_64_after_hwframe+0x41/0xa6
  [   27.468673] RIP: 0033:0x7f285dd57590
  [   27.468675] RSP: 002b:00007ffd4370bf38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
  [   27.468678] RAX: ffffffffffffffda RBX: 00007ffd43714040 RCX: 00007f285dd57590
  [   27.468679] RDX: 0000000000000000 RSI: 00007ffd4370bf80 RDI: 0000000000000003
  [   27.468681] RBP: 000000006364ddd8 R08: 0000000000000040 R09: 0000000000000008
  [   27.468682] R10: 00000000000005e7 R11: 0000000000000246 R12: 00007ffd4370bf80
  [   27.468683] R13: 0000000000000000 R14: 00000000006573a0 R15: 00007ffd43714018
  [   27.468703] NOHZ: local_softirq_pending 282

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