Hi all,
I've started seeing the following in the latest -next kernel.
[ 531.127489] kernel BUG at mm/vmstat.c:1408!
[ 531.128157] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[ 531.128872] Modules linked in:
[ 531.129324] CPU: 6 PID: 407 Comm: kworker/6:1 Not tainted 4.4.0-rc5-next-20151218-sasha-00021-gaba8d84-dirty #2750
[ 531.130939] Workqueue: vmstat vmstat_update
[ 531.131741] task: ffff880204070000 ti: ffff880204078000 task.ti: ffff880204078000
[ 531.133189] RIP: vmstat_update (mm/vmstat.c:1408)
[ 531.134466] RSP: 0018:ffff88020407fbf8 EFLAGS: 00010293
[ 531.135132] RAX: 0000000000000006 RBX: ffff8800418e2fd8 RCX: 0000000000000000
[ 531.135995] RDX: 0000000000000007 RSI: ffffffff8c0982a0 RDI: ffffffff9b8bd6e4
[ 531.137475] RBP: ffff88020407fc18 R08: 0000000000000000 R09: ffff880204070230
[ 531.138304] R10: ffffffff8c0982a0 R11: 00000000e272b4f2 R12: ffff880204c1bf60
[ 531.139329] R13: ffff880204ab09c8 R14: ffff880204ab09b8 R15: ffff880204ab09b0
[ 531.140261] FS: 0000000000000000(0000) GS:ffff880204c00000(0000) knlGS:0000000000000000
[ 531.141218] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 531.142036] CR2: 00007f039a8c1944 CR3: 000000000ea28000 CR4: 00000000000006a0
[ 531.142752] Stack:
[ 531.142963] ffff880204c21000 ffff880204c21000 ffff880204c1bf60 ffff880204ab09c8
[ 531.144095] ffff88020407fd40 ffffffff813a8fea 0000000041b58ab3 ffffffff8e667cdb
[ 531.145258] ffff880204ab09f8 ffff880204c1bf68 ffff880204ab09c0 ffff880200000000
[ 531.146475] Call Trace:
[ 531.147037] process_one_work (./arch/x86/include/asm/preempt.h:22 kernel/workqueue.c:2045)
[ 531.150790] worker_thread (include/linux/compiler.h:218 include/linux/list.h:206 kernel/workqueue.c:2171)
[ 531.155176] kthread (kernel/kthread.c:209)
[ 531.158941] ret_from_fork (arch/x86/entry/entry_64.S:469)
[ 531.160654] Code: 75 1e be 79 00 00 00 48 c7 c7 80 0f 10 8c 89 45 e4 e8 cd 92 cd ff 8b 45 e4 c6 05 e1 c4 13 1a 01 89 c0 f0 48 0f ab 03 72 02 eb 0e <0f> 0b 48 c7 c7 c0 f1 47 90 e8 3d 03 ae 01 48 83 c4 08 5b 41 5c
All code
========
0: 75 1e jne 0x20
2: be 79 00 00 00 mov $0x79,%esi
7: 48 c7 c7 80 0f 10 8c mov $0xffffffff8c100f80,%rdi
e: 89 45 e4 mov %eax,-0x1c(%rbp)
11: e8 cd 92 cd ff callq 0xffffffffffcd92e3
16: 8b 45 e4 mov -0x1c(%rbp),%eax
19: c6 05 e1 c4 13 1a 01 movb $0x1,0x1a13c4e1(%rip) # 0x1a13c501
20: 89 c0 mov %eax,%eax
22: f0 48 0f ab 03 lock bts %rax,(%rbx)
27: 72 02 jb 0x2b
29: eb 0e jmp 0x39
2b:* 0f 0b ud2 <-- trapping instruction
2d: 48 c7 c7 c0 f1 47 90 mov $0xffffffff9047f1c0,%rdi
34: e8 3d 03 ae 01 callq 0x1ae0376
39: 48 83 c4 08 add $0x8,%rsp
3d: 5b pop %rbx
3e: 41 5c pop %r12
...
Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: 48 c7 c7 c0 f1 47 90 mov $0xffffffff9047f1c0,%rdi
9: e8 3d 03 ae 01 callq 0x1ae034b
e: 48 83 c4 08 add $0x8,%rsp
12: 5b pop %rbx
13: 41 5c pop %r12
...
[ 531.164630] RIP vmstat_update (mm/vmstat.c:1408)
[ 531.165523] RSP <ffff88020407fbf8>
Thanks,
Sasha
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