Re: [Crash-utility] [PATCH] add a new command: ipcs

----- Original Message ----- > Hello Dave, > > I cannot get all kernels at hand. So I have to ask you about the code. > Please show me. Why not? Just download the upstream kernels from here: http://www.kernel.org/pub/linux/kernel/v2.6/ >> >> (a) On these kernel versions: >> >> 2.6.9-89.ELxenU >> 2.6.15-1.2054_FC5 >> 2.6.16.33-xen >> 2.6.18-1.2714.el5xen >> 2.6.18-36.el5xen >> 2.6.18-58.el5xen >> 2.6.18-152.el5xen >> 2.6.31 uniprocessor kernel >> >> the command fails immediatedly with this error: >> >> ipcs: cannot resolve "hugetlbfs_file_operations" >> >> >> (b) On *all* RHEL5 2.6.18-era kernels, the message queue display >> always fails like this: >> >> ------ Message Queues -------- >> KEY MSQID UID PERMS USED-BYTES >> MESSAGES >> ipcs: invalid structure member offset: kern_ipc_perm_id >> FILE: ipcs.c LINE: 899 FUNCTION: get_msg_info() > > I want to see the struct msg_queue and struct struct kern_ipc_perm. Here is the output from a RHEL5 kernel: crash> msg_queue struct msg_queue { struct kern_ipc_perm q_perm; int q_id; time_t q_stime; time_t q_rtime; time_t q_ctime; long unsigned int q_cbytes; long unsigned int q_qnum; long unsigned int q_qbytes; pid_t q_lspid; pid_t q_lrpid; struct list_head q_messages; struct list_head q_receivers; struct list_head q_senders; } SIZE: 160 crash> kern_ipc_perm struct kern_ipc_perm { spinlock_t lock; int deleted; key_t key; uid_t uid; gid_t gid; uid_t cuid; gid_t cgid; mode_t mode; long unsigned int seq; void *security; } SIZE: 48 crash> which is the same as the upstream 2.6.18 kernel.

>> >> (c) On this 2.6.36-0.16.rc3.git0.fc15 Fedora kernel, it shows: >> >> ------ Shared Memory Segments ------ >> KEY SHMID UID PERMS BYTES NATTCH >> STATUS >> ipcs: invalid kernel virtual address: 10 type: "nsproxy.ipc_ns" > > what is struct nsproxy? Or is there any symbol referring to ipc_ns? crash> nsproxy struct nsproxy { atomic_t count; struct uts_namespace *uts_ns; struct ipc_namespace *ipc_ns; struct mnt_namespace *mnt_ns; struct pid_namespace *pid_ns; struct net *net_ns; } SIZE: 48 crash> It's the same as upstream 2.6.36, but it's not the offset that's invalid, it's the NULL "nsproxy" address.

> >> >> >> (d) On *all* RHEL4 2.6.9-era and SLES9 2.6.5-era kernels, the >> command fail like this: >> >> ------ Shared Memory Segments ------ >> KEY SHMID UID PERMS BYTES NATTCH >> STATUS >> ipcs: invalid structure member offset: ipc_id_ary_p >> FILE: ipcs.c LINE: 540 FUNCTION: ipc_search_array() >> >> or this: >> >> ------ Shared Memory Segments ------ >> KEY SHMID UID PERMS BYTES NATTCH >> STATUS >> (none allocated)------ Semaphore Arrays -------- >> KEY SEMID UID PERMS NSEMS >> ipcs: invalid structure member offset: ipc_id_ary_p >> FILE: ipcs.c LINE: 540 FUNCTION: ipc_search_array() >> > > what is struct ipc_id? And what is entries in struct ipc_id or something > similar to it? This is from a RHEL4 kernel -- and the upstream 2.6.9 kernel is the same: crash> ipc_id struct ipc_id { struct kern_ipc_perm *p; } SIZE: 8 crash> kern_ipc_perm struct kern_ipc_perm { spinlock_t lock; int deleted; key_t key; uid_t uid; gid_t gid; uid_t cuid; gid_t cgid; mode_t mode; long unsigned int seq; void *security; } SIZE: 56 crash> Dave -- Crash-utility mailing list Crash-utility(a)redhat.com https://www.redhat.com/mailman/listinfo/crash-utility