FYI, we noticed the following commit (built with gcc-6):
commit: e7396cb0c70c677f0ba6ec185268ab37dfd70e8b ("net/sock: Update sk rcu iterator macro.")
url: https://github.com/0day-ci/linux/commits/Tim-Hansen/net-sock-Update-sk-rcu-iterator-macro/20171024-011056
in testcase: boot
on test machine: qemu-system-x86_64 -enable-kvm -cpu IvyBridge -m 420M
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
+-------------------------------------------------------+------------+------------+
| | 058c8d5912 | e7396cb0c7 |
+-------------------------------------------------------+------------+------------+
| boot_successes | 6 | 2 |
| boot_failures | 4 | 8 |
| BUG:kernel_hang_in_test_stage | 4 | |
| BUG:unable_to_handle_kernel | 0 | 8 |
| Oops:#[##] | 0 | 8 |
| Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 0 | 8 |
+-------------------------------------------------------+------------+------------+
[ 6.460307] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 6.462280] IP: __udp4_lib_rcv+0x4a4/0x7b9
[ 6.463023] PGD 0 P4D 0
[ 6.463518] Oops: 0000 [#1] PREEMPT SMP
[ 6.464240] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.14.0-rc5-01670-ge7396cb #21
[ 6.465614] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[ 6.467136] task: ffff9ddbc0050000 task.stack: ffffb8d300008000
[ 6.468208] RIP: 0010:__udp4_lib_rcv+0x4a4/0x7b9
[ 6.469050] RSP: 0000:ffff9ddbd9e03b98 EFLAGS: 00010297
[ 6.469692] RAX: 0000000000000000 RBX: ffff9ddbd4fb78e2 RCX: ffff9ddbd7a5a000
[ 6.470432] RDX: 0000000000000040 RSI: 0000000000000044 RDI: 0000000000000005
[ 6.471164] RBP: ffff9ddbd9e03bf0 R08: ffff9ddbc0050808 R09: 0000000041aaf7e1
[ 6.472046] R10: 000000000202000a R11: ffffffffb434ecea R12: 0000000000000000
[ 6.473262] R13: ffff9ddbd769a600 R14: 00000000000000ff R15: ffffffffb456d6b0
[ 6.474089] FS: 0000000000000000(0000) GS:ffff9ddbd9e00000(0000) knlGS:0000000000000000
[ 6.474917] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 6.475507] CR2: 0000000000000000 CR3: 000000000d416000 CR4: 00000000001406f0
[ 6.476518] Call Trace:
[ 6.476777]
[ 6.477004] udp_rcv+0x15/0x17
[ 6.477327] ip_local_deliver_finish+0x97/0x1bf
[ 6.477824] ip_local_deliver+0xf7/0x100
[ 6.478320] ? inet_del_offload+0x40/0x40
[ 6.478739] ip_rcv_finish+0x31b/0x395
[ 6.479139] ip_rcv+0x31e/0x353
[ 6.479473] ? ic_bootp_recv+0x223/0x54e
[ 6.479892] __netif_receive_skb_core+0x5a6/0x714
[ 6.480383] __netif_receive_skb+0x18/0x59
[ 6.480809] netif_receive_skb_internal+0x79/0x16e
[ 6.481311] napi_gro_receive+0x48/0x80
[ 6.481713] e1000_clean_rx_irq+0x371/0x3ef
[ 6.482156] e1000_clean+0x523/0x6a6
[ 6.482532] net_rx_action+0xf0/0x237
[ 6.482920] __do_softirq+0xc9/0x1c7
[ 6.483295] do_softirq_own_stack+0x2a/0x40
[ 6.483928]
[ 6.484267] do_softirq+0x58/0x5b
[ 6.484821] __local_bh_enable_ip+0x4c/0x65
[ 6.485283] __dev_queue_xmit+0x518/0x52a
[ 6.485702] dev_queue_xmit+0xb/0xd
[ 6.486079] ip_auto_config+0x8a0/0xdda
[ 6.486543] ? _raw_write_unlock+0x22/0x33
[ 6.486976] ? set_debug_rodata+0x12/0x12
[ 6.487396] ? ip_auto_config+0xdda/0xdda
[ 6.487971] ? set_debug_rodata+0x12/0x12
[ 6.488401] ip_auto_config+0x32/0x34
[ 6.488996] ? ip_auto_config+0x32/0x34
[ 6.489398] do_one_initcall+0x8b/0x132
[ 6.489797] ? set_debug_rodata+0x12/0x12
[ 6.490222] kernel_init_freeable+0x19f/0x224
[ 6.490672] ? rest_init+0x135/0x135
[ 6.491054] kernel_init+0x9/0xe6
[ 6.491403] ret_from_fork+0x25/0x30
[ 6.491779] Code: 89 45 d0 8b 45 d0 ba 18 00 00 00 48 6b c0 60 49 03 47 08 eb 13 ba 40 00 00 00 c7 45 c8 00 00 00 00 c7 45 d0 00 00 00 00 48 8b 00 <4c> 8b 30 89 d0 48 89 45 b0 4d 85 f6 74 6d 4d 89 f1 4c 2b 4d b0
[ 6.493821] RIP: __udp4_lib_rcv+0x4a4/0x7b9 RSP: ffff9ddbd9e03b98
[ 6.494450] CR2: 0000000000000000
[ 6.494797] ---[ end trace 391afe16dee9f455 ]---
To reproduce:
git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
bin/lkp qemu -k job-script # job-script is attached in this email
Thanks,
Xiaolong