Re: 5.14.9 aarch64 OOPS Workqueue: btrfs-delalloc btrfs_work_helper

[Nikolay Borisov <nborisov@suse.com>]

On 21.10.21 г. 2:55, Chris Murphy wrote:
> On Tue, Oct 19, 2021 at 9:10 PM Su Yue <l@damenly.su> wrote:
>>
>> Dump file and vmlinu[zx] kernel file are needed.
> 
> So we get a splat but kdump doesn't create a vmcore. Do we need to
> issue sysrq+c at the time of the hang and splat to create it?

Alternatively you can set the following sysctl to 1;

kernel.panic_on_warn = 1


> 
> Fedora Linux 35 (Cloud Edition)
> Kernel 5.14.10-300.fc35.aarch64 on an aarch64 (ttyAMA0)
> 
> eth0: 199.204.45.141 2604:e100:1:0:f816:3eff:fe72:c876
> dusty-35 login: [  286.982605] Unable to handle kernel paging request
> at virtual address fffffffffffffdd0
> [  286.988338] Mem abort info:
> [  286.990307]   ESR = 0x96000004
> [  286.992596]   EC = 0x25: DABT (current EL), IL = 32 bits
> [  286.996316]   SET = 0, FnV = 0
> [  286.998454]   EA = 0, S1PTW = 0
> [  287.000791]   FSC = 0x04: level 0 translation fault
> [  287.004472] Data abort info:
> [  287.006540]   ISV = 0, ISS = 0x00000004
> [  287.009239]   CM = 0, WnR = 0
> [  287.011344] swapper pgtable: 4k pages, 48-bit VAs, pgdp=0000000054181000
> [  287.018245] [fffffffffffffdd0] pgd=0000000000000000, p4d=0000000000000000
> [  287.024209] Internal error: Oops: 96000004 [#1] SMP
> [  287.027615] Modules linked in: virtio_gpu virtio_dma_buf
> drm_kms_helper cec joydev fb_sys_fops syscopyarea virtio_net
> sysfillrect sysimgblt net_failover virtio_balloon failover vfat fat
> drm fuse zram ip_tables crct10dif_ce ghash_ce virtio_blk qemu_fw_cfg
> virtio_mmio aes_neon_bs
> [  287.047659] CPU: 0 PID: 3558 Comm: kworker/u8:7 Kdump: loaded Not
> tainted 5.14.10-300.fc35.aarch64 #1
> [  287.055269] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015
> [  287.060932] Workqueue: btrfs-delalloc btrfs_work_helper
> [  287.065353] pstate: 80400005 (Nzcv daif +PAN -UAO -TCO BTYPE=--)
> [  287.070568] pc : submit_compressed_extents+0x38/0x3d0
> [  287.074825] lr : async_cow_submit+0x50/0xd0
> [  287.078217] sp : ffff800015d4bc20
> [  287.081008] x29: ffff800015d4bc30 x28: 0000000000000000 x27: ffffb8a2fa941000
> [  287.087022] x26: fffffffffffffdd0 x25: dead000000000100 x24: ffff000115873608
> [  287.092822] x23: 0000000000000000 x22: 0000000000000001 x21: ffff0000c6f25800
> [  287.098591] x20: ffff0000c0596000 x19: 0000000000000001 x18: ffff0000c2100bd4
> [  287.104387] x17: ffff000115875ff8 x16: 0000000000000006 x15: 50006a3d10a961cd
> [  287.110159] x14: f0668b836620caa1 x13: 0000000000000020 x12: ffff0001fefa68c0
> [  287.116170] x11: ffffb8a2fa95b500 x10: 0000000000000000 x9 : ffffb8a2f9131c40
> [  287.122120] x8 : ffff475f045bb000 x7 : ffff800015d4bbe0 x6 : ffffb8a2fae8ad40
> [  287.128086] x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff0000c6f25820
> [  287.133953] x2 : 0000000000000000 x1 : ffff000115873630 x0 : ffff000115873630
> [  287.139760] Call trace:
> [  287.141784]  submit_compressed_extents+0x38/0x3d0
> [  287.145620]  async_cow_submit+0x50/0xd0
> [  287.148801]  run_ordered_work+0xc8/0x280
> [  287.152005]  btrfs_work_helper+0x98/0x250
> [  287.155450]  process_one_work+0x1f0/0x4ac
> [  287.161577]  worker_thread+0x188/0x504
> [  287.167461]  kthread+0x110/0x114
> [  287.172872]  ret_from_fork+0x10/0x18
> [  287.178558] Code: a9056bf9 f8428437 f9401400 d108c2fa (f9400356)
> [  287.186268] ---[ end trace 41ec405ced3786b6 ]---
> 
> 
>