mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2025-01-20 18:27:59 +07:00
9e3961a097
There have been several times where I have had to rebuild a kernel to
cause a panic when hitting a WARN() in the code in order to get a crash
dump from a system. Sometimes this is easy to do, other times (such as
in the case of a remote admin) it is not trivial to send new images to
the user.
A much easier method would be a switch to change the WARN() over to a
panic. This makes debugging easier in that I can now test the actual
image the WARN() was seen on and I do not have to engage in remote
debugging.
This patch adds a panic_on_warn kernel parameter and
/proc/sys/kernel/panic_on_warn calls panic() in the
warn_slowpath_common() path. The function will still print out the
location of the warning.
An example of the panic_on_warn output:
The first line below is from the WARN_ON() to output the WARN_ON()'s
location. After that the panic() output is displayed.
WARNING: CPU: 30 PID: 11698 at /home/prarit/dummy_module/dummy-module.c:25 init_dummy+0x1f/0x30 [dummy_module]()
Kernel panic - not syncing: panic_on_warn set ...
CPU: 30 PID: 11698 Comm: insmod Tainted: G W OE 3.17.0+ #57
Hardware name: Intel Corporation S2600CP/S2600CP, BIOS RMLSDP.86I.00.29.D696.1311111329 11/11/2013
0000000000000000 000000008e3f87df ffff88080f093c38 ffffffff81665190
0000000000000000 ffffffff818aea3d ffff88080f093cb8 ffffffff8165e2ec
ffffffff00000008 ffff88080f093cc8 ffff88080f093c68 000000008e3f87df
Call Trace:
[<ffffffff81665190>] dump_stack+0x46/0x58
[<ffffffff8165e2ec>] panic+0xd0/0x204
[<ffffffffa038e05f>] ? init_dummy+0x1f/0x30 [dummy_module]
[<ffffffff81076b90>] warn_slowpath_common+0xd0/0xd0
[<ffffffffa038e040>] ? dummy_greetings+0x40/0x40 [dummy_module]
[<ffffffff81076c8a>] warn_slowpath_null+0x1a/0x20
[<ffffffffa038e05f>] init_dummy+0x1f/0x30 [dummy_module]
[<ffffffff81002144>] do_one_initcall+0xd4/0x210
[<ffffffff811b52c2>] ? __vunmap+0xc2/0x110
[<ffffffff810f8889>] load_module+0x16a9/0x1b30
[<ffffffff810f3d30>] ? store_uevent+0x70/0x70
[<ffffffff810f49b9>] ? copy_module_from_fd.isra.44+0x129/0x180
[<ffffffff810f8ec6>] SyS_finit_module+0xa6/0xd0
[<ffffffff8166cf29>] system_call_fastpath+0x12/0x17
Successfully tested by me.
hpa said: There is another very valid use for this: many operators would
rather a machine shuts down than being potentially compromised either
functionally or security-wise.
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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| .. | ||
| byteorder | ||
| caif | ||
| can | ||
| cifs | ||
| dvb | ||
| genwqe | ||
| hdlc | ||
| hsi | ||
| isdn | ||
| mmc | ||
| netfilter | ||
| netfilter_arp | ||
| netfilter_bridge | ||
| netfilter_ipv4 | ||
| netfilter_ipv6 | ||
| nfsd | ||
| raid | ||
| spi | ||
| sunrpc | ||
| tc_act | ||
| tc_ematch | ||
| usb | ||
| wimax | ||
| a.out.h | ||
| acct.h | ||
| adb.h | ||
| adfs_fs.h | ||
| affs_hardblocks.h | ||
| agpgart.h | ||
| aio_abi.h | ||
| apm_bios.h | ||
| arcfb.h | ||
| atalk.h | ||
| atm_eni.h | ||
| atm_he.h | ||
| atm_idt77105.h | ||
| atm_nicstar.h | ||
| atm_tcp.h | ||
| atm_zatm.h | ||
| atm.h | ||
| atmapi.h | ||
| atmarp.h | ||
| atmbr2684.h | ||
| atmclip.h | ||
| atmdev.h | ||
| atmioc.h | ||
| atmlec.h | ||
| atmmpc.h | ||
| atmppp.h | ||
| atmsap.h | ||
| atmsvc.h | ||
| audit.h | ||
| auto_fs4.h | ||
| auto_fs.h | ||
| auxvec.h | ||
| ax25.h | ||
| b1lli.h | ||
| baycom.h | ||
| bcache.h | ||
| bcm933xx_hcs.h | ||
| bfs_fs.h | ||
| binfmts.h | ||
| blkpg.h | ||
| blktrace_api.h | ||
| bpf_common.h | ||
| bpf.h | ||
| bpqether.h | ||
| bsg.h | ||
| btrfs.h | ||
| can.h | ||
| capability.h | ||
| capi.h | ||
| cciss_defs.h | ||
| cciss_ioctl.h | ||
| cdrom.h | ||
| cgroupstats.h | ||
| chio.h | ||
| cm4000_cs.h | ||
| cn_proc.h | ||
| coda_psdev.h | ||
| coda.h | ||
| coff.h | ||
| connector.h | ||
| const.h | ||
| cramfs_fs.h | ||
| cuda.h | ||
| cyclades.h | ||
| cycx_cfm.h | ||
| dcbnl.h | ||
| dccp.h | ||
| dlm_device.h | ||
| dlm_netlink.h | ||
| dlm_plock.h | ||
| dlm.h | ||
| dlmconstants.h | ||
| dm-ioctl.h | ||
| dm-log-userspace.h | ||
| dn.h | ||
| dqblk_xfs.h | ||
| edd.h | ||
| efs_fs_sb.h | ||
| elf-em.h | ||
| elf-fdpic.h | ||
| elf.h | ||
| elfcore.h | ||
| errno.h | ||
| errqueue.h | ||
| ethtool.h | ||
| eventpoll.h | ||
| fadvise.h | ||
| falloc.h | ||
| fanotify.h | ||
| fb.h | ||
| fcntl.h | ||
| fd.h | ||
| fdreg.h | ||
| fib_rules.h | ||
| fiemap.h | ||
| filter.h | ||
| firewire-cdev.h | ||
| firewire-constants.h | ||
| flat.h | ||
| fou.h | ||
| fs.h | ||
| fsl_hypervisor.h | ||
| fuse.h | ||
| futex.h | ||
| gameport.h | ||
| gen_stats.h | ||
| genetlink.h | ||
| gfs2_ondisk.h | ||
| gigaset_dev.h | ||
| hash_info.h | ||
| hdlc.h | ||
| hdlcdrv.h | ||
| hdreg.h | ||
| hid.h | ||
| hiddev.h | ||
| hidraw.h | ||
| hpet.h | ||
| hsr_netlink.h | ||
| hw_breakpoint.h | ||
| hyperv.h | ||
| hysdn_if.h | ||
| i2c-dev.h | ||
| i2c.h | ||
| i2o-dev.h | ||
| i8k.h | ||
| icmp.h | ||
| icmpv6.h | ||
| if_addr.h | ||
| if_addrlabel.h | ||
| if_alg.h | ||
| if_arcnet.h | ||
| if_arp.h | ||
| if_bonding.h | ||
| if_bridge.h | ||
| if_cablemodem.h | ||
| if_eql.h | ||
| if_ether.h | ||
| if_fc.h | ||
| if_fddi.h | ||
| if_frad.h | ||
| if_hippi.h | ||
| if_infiniband.h | ||
| if_link.h | ||
| if_ltalk.h | ||
| if_packet.h | ||
| if_phonet.h | ||
| if_plip.h | ||
| if_ppp.h | ||
| if_pppol2tp.h | ||
| if_pppox.h | ||
| if_slip.h | ||
| if_team.h | ||
| if_tun.h | ||
| if_tunnel.h | ||
| if_vlan.h | ||
| if_x25.h | ||
| if.h | ||
| igmp.h | ||
| in6.h | ||
| in_route.h | ||
| in.h | ||
| inet_diag.h | ||
| inotify.h | ||
| input.h | ||
| ioctl.h | ||
| ip6_tunnel.h | ||
| ip_vs.h | ||
| ip.h | ||
| ipc.h | ||
| ipmi_msgdefs.h | ||
| ipmi.h | ||
| ipsec.h | ||
| ipv6_route.h | ||
| ipv6.h | ||
| ipx.h | ||
| irda.h | ||
| irqnr.h | ||
| isdn_divertif.h | ||
| isdn_ppp.h | ||
| isdn.h | ||
| isdnif.h | ||
| iso_fs.h | ||
| ivtv.h | ||
| ivtvfb.h | ||
| ixjuser.h | ||
| jffs2.h | ||
| joystick.h | ||
| Kbuild | ||
| kd.h | ||
| kdev_t.h | ||
| kernel-page-flags.h | ||
| kernel.h | ||
| kernelcapi.h | ||
| kexec.h | ||
| keyboard.h | ||
| keyctl.h | ||
| kvm_para.h | ||
| kvm.h | ||
| l2tp.h | ||
| libc-compat.h | ||
| limits.h | ||
| llc.h | ||
| loop.h | ||
| lp.h | ||
| magic.h | ||
| major.h | ||
| map_to_7segment.h | ||
| matroxfb.h | ||
| mdio.h | ||
| media.h | ||
| mei.h | ||
| memfd.h | ||
| mempolicy.h | ||
| meye.h | ||
| mic_common.h | ||
| mic_ioctl.h | ||
| mii.h | ||
| minix_fs.h | ||
| mman.h | ||
| mmtimer.h | ||
| module.h | ||
| mpls.h | ||
| mqueue.h | ||
| mroute6.h | ||
| mroute.h | ||
| msdos_fs.h | ||
| msg.h | ||
| mtio.h | ||
| n_r3964.h | ||
| nbd.h | ||
| ncp_fs.h | ||
| ncp_mount.h | ||
| ncp_no.h | ||
| ncp.h | ||
| neighbour.h | ||
| net_dropmon.h | ||
| net_tstamp.h | ||
| net.h | ||
| netconf.h | ||
| netdevice.h | ||
| netfilter_arp.h | ||
| netfilter_bridge.h | ||
| netfilter_decnet.h | ||
| netfilter_ipv4.h | ||
| netfilter_ipv6.h | ||
| netfilter.h | ||
| netlink_diag.h | ||
| netlink.h | ||
| netrom.h | ||
| nfc.h | ||
| nfs2.h | ||
| nfs3.h | ||
| nfs4_mount.h | ||
| nfs4.h | ||
| nfs_fs.h | ||
| nfs_idmap.h | ||
| nfs_mount.h | ||
| nfs.h | ||
| nfsacl.h | ||
| nl80211.h | ||
| nubus.h | ||
| nvme.h | ||
| nvram.h | ||
| omap3isp.h | ||
| omapfb.h | ||
| oom.h | ||
| openvswitch.h | ||
| packet_diag.h | ||
| param.h | ||
| parport.h | ||
| patchkey.h | ||
| pci_regs.h | ||
| pci.h | ||
| perf_event.h | ||
| personality.h | ||
| pfkeyv2.h | ||
| pg.h | ||
| phantom.h | ||
| phonet.h | ||
| pkt_cls.h | ||
| pkt_sched.h | ||
| pktcdvd.h | ||
| pmu.h | ||
| poll.h | ||
| posix_types.h | ||
| ppdev.h | ||
| ppp_defs.h | ||
| ppp-comp.h | ||
| ppp-ioctl.h | ||
| pps.h | ||
| prctl.h | ||
| psci.h | ||
| ptp_clock.h | ||
| ptrace.h | ||
| qnx4_fs.h | ||
| qnxtypes.h | ||
| quota.h | ||
| radeonfb.h | ||
| random.h | ||
| raw.h | ||
| rds.h | ||
| reboot.h | ||
| reiserfs_fs.h | ||
| reiserfs_xattr.h | ||
| resource.h | ||
| rfkill.h | ||
| romfs_fs.h | ||
| rose.h | ||
| route.h | ||
| rtc.h | ||
| rtnetlink.h | ||
| scc.h | ||
| sched.h | ||
| screen_info.h | ||
| sctp.h | ||
| sdla.h | ||
| seccomp.h | ||
| securebits.h | ||
| selinux_netlink.h | ||
| sem.h | ||
| serial_core.h | ||
| serial_reg.h | ||
| serial.h | ||
| serio.h | ||
| shm.h | ||
| signal.h | ||
| signalfd.h | ||
| smiapp.h | ||
| snmp.h | ||
| sock_diag.h | ||
| socket.h | ||
| sockios.h | ||
| som.h | ||
| sonet.h | ||
| sonypi.h | ||
| sound.h | ||
| soundcard.h | ||
| stat.h | ||
| stddef.h | ||
| string.h | ||
| suspend_ioctls.h | ||
| swab.h | ||
| synclink.h | ||
| sysctl.h | ||
| sysinfo.h | ||
| target_core_user.h | ||
| taskstats.h | ||
| tcp_metrics.h | ||
| tcp.h | ||
| telephony.h | ||
| termios.h | ||
| time.h | ||
| times.h | ||
| timex.h | ||
| tiocl.h | ||
| tipc_config.h | ||
| tipc.h | ||
| toshiba.h | ||
| tty_flags.h | ||
| tty.h | ||
| types.h | ||
| udf_fs_i.h | ||
| udp.h | ||
| uhid.h | ||
| uinput.h | ||
| uio.h | ||
| ultrasound.h | ||
| un.h | ||
| unistd.h | ||
| unix_diag.h | ||
| usbdevice_fs.h | ||
| usbip.h | ||
| utime.h | ||
| utsname.h | ||
| uuid.h | ||
| uvcvideo.h | ||
| v4l2-common.h | ||
| v4l2-controls.h | ||
| v4l2-dv-timings.h | ||
| v4l2-mediabus.h | ||
| v4l2-subdev.h | ||
| veth.h | ||
| vfio.h | ||
| vhost.h | ||
| videodev2.h | ||
| virtio_9p.h | ||
| virtio_balloon.h | ||
| virtio_blk.h | ||
| virtio_config.h | ||
| virtio_console.h | ||
| virtio_ids.h | ||
| virtio_net.h | ||
| virtio_pci.h | ||
| virtio_ring.h | ||
| virtio_rng.h | ||
| vm_sockets.h | ||
| vsp1.h | ||
| vt.h | ||
| wait.h | ||
| wanrouter.h | ||
| watchdog.h | ||
| wil6210_uapi.h | ||
| wimax.h | ||
| wireless.h | ||
| x25.h | ||
| xattr.h | ||
| xfrm.h | ||
| zorro_ids.h | ||
| zorro.h | ||