Re: [mm] c566586818: BUG:kernel_hang_in_early-boot_stage,last_printk:Probing_EDD(edd=off_to_disable)...ok

[Qian Cai]

On Mon, Aug 24, 2020 at 10:47:20AM +0800, Rong Chen wrote:
> 
> 
> On 8/21/20 9:01 AM, Qian Cai wrote:
> > On Tue, Aug 18, 2020 at 08:23:51AM +0800, kernel test robot wrote:
> > > Greeting,
> > > 
> > > FYI, we noticed the following commit (built with gcc-9):
> > > 
> > > commit: c5665868183fec689dbab9fb8505188b2c4f0757 ("mm: kmemleak: use the memory pool for early allocations")
> > I might see one of those early boot failure before. In my case, the bare-metal
> > system was reset. Can you try to narrow down to a smaller
> > CONFIG_DEBUG_KMEMLEAK_MEM_POOL_SIZE (assume 0 works if your bisecting was
> > correct) that works?
> 
> Hi Qian,
> 
> Adding CONFIG_EARLY_PRINTK=y to the kconfig file, and the boot hangs in the
> below position:
> 
> [    0.715834] Kernel command line: root=/dev/ram0 hung_task_panic=1 debug
> apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100
> net.ifnames=0 printk.devkmsg=on panic=-1 softlockup_panic=1
> nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0
> drbd.minor_count=8
> systemd.log_level=err ignore_loglevel console=tty0 earlyprintk=ttyS0,115200
> console=ttyS0,115200 vga=normal rw rcuperf.shutdown=0 watchdog_thresh=60
> [    0.719688] sysrq: sysrq always enabled.
> [    0.801005] Dentry cache hash table entries: 2097152 (order: 12, 16777216
> bytes, linear)
> [    0.805588] Inode-cache hash table entries: 1048576 (order: 11, 8388608
> bytes, linear)
> [    0.806464] mem auto-init: stack:off, heap alloc:on, heap free:off
> [    1.080978] Memory: 12319196K/12680692K available (10243K kernel code,
> 2414K rwdata, 8184K rodata, 856K init, 20772K bss, 361496K reserved, 0K
> cma-reserved)
> qemu-system-x86_64: terminating on signal 2
> 
> The problem disappeared if CONFIG_DEBUG_KMEMLEAK_MEM_POOL_SIZE=400:

Interesting. Can you paste the line as show:

./scripts/faddr2line vmlinux lookup_address_in_pgd+0xd1/0x158

Also, does this happens on the latest mainline or linux-next? Looks like you
were reproducing using v5.3.

> 
> [    1.064575] Kernel command line: root=/dev/ram0 hung_task_panic=1 debug
> apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100
> net.ifnames=0 printk.devkmsg=on panic=-1 softlockup_panic=1
> nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0
> drbd.minor_count=8
> systemd.log_level=err ignore_loglevel console=tty0 earlyprintk=ttyS0,115200
> console=ttyS0,115200 vga=normal rw rcuperf.shutdown=0 watchdog_thresh=60
> [    1.068883] sysrq: sysrq always enabled.
> [    1.108720] Dentry cache hash table entries: 2097152 (order: 12, 16777216
> bytes, linear)
> [    1.148852] Inode-cache hash table entries: 1048576 (order: 11, 8388608
> bytes, linear)
> [    1.150271] mem auto-init: stack:off, heap alloc:on, heap free:off
> [    1.835309] Memory: 12325340K/12680692K available (10243K kernel code,
> 2414K rwdata, 8192K rodata, 856K init, 14628K bss, 355352K reserved, 0K
> cma-reserved)
> [    3.487078] general protection fault: 0000 [#1] DEBUG_PAGEALLOC PTI
> [    3.488185] CPU: 0 PID: 0 Comm: swapper Not tainted
> 5.3.0-11792-gc5665868183fe #1
> [    3.489581] RIP: 0010:lookup_address_in_pgd+0xd1/0x158
> [    3.490566] Code: 80 e0 01 0f 84 a7 00 00 00 49 89 f0 b8 11 ff ff 01 48
> 21 f9 49 c1 e8 12 48 c1 e0 27 41 81 e0 f8 0f 00 00 49 01 c0 49 8d 04 08 <48>
> f7 00 9f ff ff ff 0f 84 34 ff ff ff c7 02 02 00 00 00 48 8b 38
> [    3.494020] RSP: 0000:ffffffff8239e700 EFLAGS: 00010086
> [    3.494959] RAX: ffff110302110d90 RBX: 0000000000000001 RCX:
> ffff888302110000
> [    3.496222] RDX: ffffffff8239e72c RSI: ffff88833653b000 RDI:
> ffff88833653a000
> [    3.497363] RBP: ffffffff8239e808 R08: ffff888000000d90 R09:
> 0000000000346000
> [    3.498467] R10: 0000000000000001 R11: 0000000000000000 R12:
> 0000000000000001
> [    3.499554] R13: 0000000000000000 R14: ffff88833653b000 R15:
> 0000000000000000
> [    3.500638] FS:  0000000000000000(0000) GS:ffffffff8243d000(0000)
> knlGS:0000000000000000
> [    3.501863] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    3.503036] CR2: ffff8883447ff000 CR3: 0000000002420000 CR4:
> 00000000000006b0
> [    3.504116] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> [    3.505156] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
> 0000000000000400
> [    3.506225] Call Trace:
> [    3.506597] Modules linked in:
> [    3.507255] random: get_random_bytes called from init_oops_id+0x1d/0x2c
> with crng_init=0
> [    3.508734] ---[ end trace 0000000000000000 ]---
> 
> 
> Best Regards,
> Rong Chen