Comment 0 for bug 1995870

There is a bug being triggered on a udelay 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