Re: [bug report] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000058

[Ming Lei <ming.lei@redhat.com>]

On Mon, Dec 26, 2022 at 11:11:44AM +0800, Changhui Zhong wrote:
> Hello,
> Below issue was triggered with ( v6.0.15-996-g988abd970566), pls help check it
> 
> [ 7845.648246] Unable to handle kernel NULL pointer dereference at
> virtual address 0000000000000058
> [ 7845.648776] Mem abort info:
> [ 7845.648938]   ESR = 0x0000000096000004
> [ 7845.649155]   EC = 0x25: DABT (current EL), IL = 32 bits
> [ 7845.649462]   SET = 0, FnV = 0
> [ 7845.649639]   EA = 0, S1PTW = 0
> [ 7845.649821]   FSC = 0x04: level 0 translation fault
> [ 7845.650105] Data abort info:
> [ 7845.650274]   ISV = 0, ISS = 0x00000004
> [ 7845.650496]   CM = 0, WnR = 0
> [ 7845.650670] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000103cba000
> [ 7845.651043] [0000000000000058] pgd=0000000000000000, p4d=0000000000000000
> [ 7845.651446] Internal error: Oops: 96000004 [#1] SMP
> [ 7845.651764] Modules linked in: snd_aloop snd_dummy snd_seq
> snd_seq_device snd_pcm snd_timer snd soundcore ansi_cprng crypto_user
> veth vrf ipvlan echainiv esp4 des_generic libdes tun geneve ip6_tables
> ip_vs ip_set xt_sctp nf_conntrack_netlink nft_chain_nat xt_nat nf_nat
> nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nft_compat nf_tables
> nfnetlink tcp_dctcp ah6 ah4 binfmt_misc can_j1939 l2tp_core bnep hidp
> can_bcm pptp gre can_raw rfcomm bluetooth ieee802154_socket ieee802154
> af_key qrtr pppoe pppox ppp_generic slhc mpls_router ip_tunnel
> vsock_loopback vmw_vsock_virtio_transport_common
> vmw_vsock_vmci_transport vmw_vmci vsock fcrypt pcbc rxrpc smc ib_core
> kcm can macsec llc sctp ip6_udp_tunnel udp_tunnel mlx4_en mlx4_core
> nfp tls loop nls_utf8 cifs cifs_arc4 cifs_md4 dns_resolver fscache
> netfs rfkill sunrpc vfat fat virtio_net net_failover failover fuse
> zram xfs crct10dif_ce polyval_ce virtio_console polyval_generic
> ghash_ce virtio_blk virtio_mmio qemu_fw_cfg [last unloaded: vxlan]
> [ 7845.656785] CPU: 5 PID: 789199 Comm: bash Not tainted 6.0.15 #1
> [ 7845.657126] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015
> [ 7845.657523] pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> [ 7845.657932] pc : blk_mq_quiesce_queue+0x50/0xa0

Hi Changhui,

Can you figure out the fault source code by gdb?

gdb vmlinux
gdb> l *(blk_mq_quiesce_queue+0x50)


thanks, 
Ming