Most recent kernel where this bug did not occur: I've never seen it before. Distribution: openSUSE 10.3 Hardware Environment: AMD Athlon 2200+ Software Environment: openSUSE 10.3 Problem Description: I unplugged my VIA Velocity and plugged it back into a switch and shortly thereafter it gacked. I ran 'ip -s -s link show dev eth1' which sigsegd (this machine has been rock solid for YEARS so I know it's not the hardware) and the machine locked up. The blinkenlights on the switch continued to blink but according to tcpdump no traffic was flowing from this machine. A reboot later confirmed a problem and I found this in the /var/log/messages file: Nov 13 22:26:54 frank kernel: divide error: 0000 [#1] Nov 13 22:26:54 frank kernel: SMP Nov 13 22:26:54 frank kernel: last sysfs file: /block/drbd0/range Nov 13 22:26:54 frank kernel: Modules linked in: drbd xt_tcpudp xt_pkttype ipt_LOG xt_limit snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device nfs lockd nfs_acl sunrpc af_packet ipt_REJECT xt_state iptable_mangle iptable_nat nf_nat iptable_filter nf_conntrack_ipv4 nf_conntrack nfnetlink ip_tables ip6_tables x_tables tcp_bic apparmor dm_crypt loop dm_mirror dm_log dm_mod snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm snd_timer snd i2c_sis96x soundcore parport_pc button sr_mod via_velocity sis_agp rtc_cmos shpchp i2c_sis630 cdrom i2c_co re parport agpgart snd_page_alloc rtc_core rtc_lib pci_hotplug crc_ccitt sg usbhid hid ff_memless ehci_hcd sd_mod ohci_hcd usbcore piix sis5513 ide_core edd ext3 mbcache jbd fan pata_sis libata scsi_mod thermal processor Nov 13 22:26:54 frank kernel: CPU: 0 Nov 13 22:26:54 frank kernel: EIP: 0060:[<c0266de0>] Tainted: G N VLI Nov 13 22:26:54 frank kernel: EFLAGS: 00200287 (2.6.22.12-0.1-default #1) Nov 13 22:26:54 frank kernel: EIP is at sys_socketcall+0x21/0x261 Nov 13 22:26:54 frank kernel: eax: 00000001 ebx: 0000000c ecx: 00000001 edx: ffffffea Nov 13 22:26:54 frank kernel: esi: bfdaa27c edi: 00000000 ebp: ef1b8000 esp: ef1b9f78 Nov 13 22:26:54 frank kernel: ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068 Nov 13 22:26:54 frank kernel: Process ip (pid: 4350, ti=ef1b8000 task=f3d4eab0 task.ti=ef1b8000) Nov 13 22:26:54 frank kernel: Stack: 40000003 00000000 f3d4ebd8 08073160 bfdaa140 ef1b9fb8 00000000 c0107e49 Nov 13 22:26:54 frank kernel: bfdaa140 08073160 bfdaa27c 00000001 00000001 bfdaa27c 08073184 c0104ea2 Nov 13 22:26:54 frank kernel: 00000001 bfdaa140 08073160 bfdaa27c 08073184 bfdaa178 ffffffda 0000007b Nov 13 22:26:54 frank kernel: Call Trace: Nov 13 22:26:54 frank kernel: [<c0107e49>] do_syscall_trace+0x12c/0x173 Nov 13 22:26:54 frank kernel: [<c0104ea2>] syscall_call+0x7/0xb Nov 13 22:26:54 frank kernel: ======================= Nov 13 22:26:54 frank kernel: Code: c4 94 00 00 00 5b 5e 5f 5d c3 57 ba ea ff ff ff 56 53 83 ec 30 8b 44 24 40 8d 78 ff 83 ff 10 0f 87 3d 02 00 00 8a 98 68 32 2e c0 <8d> 74 24 18 8b 54 24 44 89 f0 0f b6 cb e8 2a 9b f6 ff ba f2 ff Nov 13 22:26:54 frank kernel: EIP: [<c0266de0>] sys_socketcall+0x21/0x261 SS:ESP 0068:ef1b9f78 I am willing and eager to help debug kernel problems, I merely require instructions and time.
Reply-To: akpm@linux-foundation.org (plesae respond via emailed reply-to-all) On Tue, 13 Nov 2007 20:48:44 -0800 (PST) bugme-daemon@bugzilla.kernel.org wrote: > http://bugzilla.kernel.org/show_bug.cgi?id=9375 > > Summary: divide error: 0000 [#1] with VIA Velocity when unplugged > Product: Other > Version: 2.5 > KernelVersion: 2.6.22.12 (openSUSE 10.3) > Platform: All > OS/Version: Linux > Tree: Mainline > Status: NEW > Severity: normal > Priority: P1 > Component: Other > AssignedTo: other_other@kernel-bugs.osdl.org > ReportedBy: jnelson-kernel-bugzilla@jamponi.net > > > Most recent kernel where this bug did not occur: I've never seen it before. > Distribution: openSUSE 10.3 > Hardware Environment: AMD Athlon 2200+ > Software Environment: openSUSE 10.3 > Problem Description: I unplugged my VIA Velocity and plugged it back into a > switch and shortly thereafter it gacked. > > I ran 'ip -s -s link show dev eth1' which sigsegd (this machine has been rock > solid for YEARS so I know it's not the hardware) and the machine locked up. > The > blinkenlights on the switch continued to blink but according to tcpdump no > traffic was flowing from this machine. A reboot later confirmed a problem and > I > found this in the /var/log/messages file: > > > Nov 13 22:26:54 frank kernel: divide error: 0000 [#1] > Nov 13 22:26:54 frank kernel: SMP > Nov 13 22:26:54 frank kernel: last sysfs file: /block/drbd0/range > Nov 13 22:26:54 frank kernel: Modules linked in: drbd xt_tcpudp xt_pkttype > ipt_LOG xt_limit snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device nfs lockd > nfs_acl sunrpc af_packet ipt_REJECT xt_state iptable_mangle iptable_nat > nf_nat > iptable_filter nf_conntrack_ipv4 nf_conntrack nfnetlink ip_tables ip6_tables > x_tables tcp_bic apparmor dm_crypt loop dm_mirror dm_log dm_mod snd_intel8x0 > snd_ac97_codec ac97_bus snd_pcm snd_timer snd i2c_sis96x soundcore parport_pc > button sr_mod via_velocity sis_agp rtc_cmos shpchp i2c_sis630 cdrom i2c_co > re parport agpgart snd_page_alloc rtc_core rtc_lib pci_hotplug crc_ccitt sg > usbhid hid ff_memless ehci_hcd sd_mod ohci_hcd usbcore piix sis5513 ide_core > edd ext3 mbcache jbd fan pata_sis libata scsi_mod thermal processor > Nov 13 22:26:54 frank kernel: CPU: 0 > Nov 13 22:26:54 frank kernel: EIP: 0060:[<c0266de0>] Tainted: G N > VLI > Nov 13 22:26:54 frank kernel: EFLAGS: 00200287 (2.6.22.12-0.1-default #1) > Nov 13 22:26:54 frank kernel: EIP is at sys_socketcall+0x21/0x261 > Nov 13 22:26:54 frank kernel: eax: 00000001 ebx: 0000000c ecx: 00000001 > edx: ffffffea > Nov 13 22:26:54 frank kernel: esi: bfdaa27c edi: 00000000 ebp: ef1b8000 > esp: ef1b9f78 > Nov 13 22:26:54 frank kernel: ds: 007b es: 007b fs: 00d8 gs: 0033 ss: > 0068 > Nov 13 22:26:54 frank kernel: Process ip (pid: 4350, ti=ef1b8000 > task=f3d4eab0 > task.ti=ef1b8000) > Nov 13 22:26:54 frank kernel: Stack: 40000003 00000000 f3d4ebd8 08073160 > bfdaa140 ef1b9fb8 00000000 c0107e49 > Nov 13 22:26:54 frank kernel: bfdaa140 08073160 bfdaa27c 00000001 > 00000001 bfdaa27c 08073184 c0104ea2 > Nov 13 22:26:54 frank kernel: 00000001 bfdaa140 08073160 bfdaa27c > 08073184 bfdaa178 ffffffda 0000007b > Nov 13 22:26:54 frank kernel: Call Trace: > Nov 13 22:26:54 frank kernel: [<c0107e49>] do_syscall_trace+0x12c/0x173 > Nov 13 22:26:54 frank kernel: [<c0104ea2>] syscall_call+0x7/0xb > Nov 13 22:26:54 frank kernel: ======================= > Nov 13 22:26:54 frank kernel: Code: c4 94 00 00 00 5b 5e 5f 5d c3 57 ba ea ff > ff ff 56 53 83 ec 30 8b 44 24 40 8d 78 ff 83 ff 10 0f 87 > 3d 02 00 00 8a 98 68 32 2e c0 <8d> 74 24 18 8b 54 24 44 89 f0 0f b6 cb e8 2a > 9b f6 ff ba f2 ff > Nov 13 22:26:54 frank kernel: EIP: [<c0266de0>] sys_socketcall+0x21/0x261 > SS:ESP 0068:ef1b9f78 > > hm, I see no divide instruction near the start of 2.6.22's sys_socketcall(). I'm wondering if some patch which opensuse has added is causing this. If you have the source handy can you show us what it looks like? That's net/socket.c, the 50-odd lines after asmlinkage long sys_socketcall(int call, unsigned long __user *args) What caused the kernel taint, btw? Thanks.
bugme-daemon@bugzilla.kernel.org wrote: > http://bugzilla.kernel.org/show_bug.cgi?id=9375 > > > > > > ------- Comment #1 from anonymous@kernel-bugs.osdl.org 2007-11-13 21:19 > ------- > Reply-To: akpm@linux-foundation.org > > > (plesae respond via emailed reply-to-all) > > On Tue, 13 Nov 2007 20:48:44 -0800 (PST) bugme-daemon@bugzilla.kernel.org > wrote: > >> http://bugzilla.kernel.org/show_bug.cgi?id=9375 >> >> Summary: divide error: 0000 [#1] with VIA Velocity when unplugged >> Product: Other >> Version: 2.5 >> KernelVersion: 2.6.22.12 (openSUSE 10.3) >> Platform: All >> OS/Version: Linux >> Tree: Mainline >> Status: NEW >> Severity: normal >> Priority: P1 >> Component: Other >> AssignedTo: other_other@kernel-bugs.osdl.org >> ReportedBy: jnelson-kernel-bugzilla@jamponi.net >> >> >> Most recent kernel where this bug did not occur: I've never seen it before. >> Distribution: openSUSE 10.3 >> Hardware Environment: AMD Athlon 2200+ >> Software Environment: openSUSE 10.3 >> Problem Description: I unplugged my VIA Velocity and plugged it back into a >> switch and shortly thereafter it gacked. >> >> I ran 'ip -s -s link show dev eth1' which sigsegd (this machine has been >> rock >> solid for YEARS so I know it's not the hardware) and the machine locked up. >> The >> blinkenlights on the switch continued to blink but according to tcpdump no >> traffic was flowing from this machine. A reboot later confirmed a problem >> and I >> found this in the /var/log/messages file: >> >> >> Nov 13 22:26:54 frank kernel: divide error: 0000 [#1] >> Nov 13 22:26:54 frank kernel: SMP >> Nov 13 22:26:54 frank kernel: last sysfs file: /block/drbd0/range >> Nov 13 22:26:54 frank kernel: Modules linked in: drbd xt_tcpudp xt_pkttype >> ipt_LOG xt_limit snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device nfs lockd >> nfs_acl sunrpc af_packet ipt_REJECT xt_state iptable_mangle iptable_nat >> nf_nat >> iptable_filter nf_conntrack_ipv4 nf_conntrack nfnetlink ip_tables ip6_tables >> x_tables tcp_bic apparmor dm_crypt loop dm_mirror dm_log dm_mod snd_intel8x0 >> snd_ac97_codec ac97_bus snd_pcm snd_timer snd i2c_sis96x soundcore >> parport_pc >> button sr_mod via_velocity sis_agp rtc_cmos shpchp i2c_sis630 cdrom i2c_co >> re parport agpgart snd_page_alloc rtc_core rtc_lib pci_hotplug crc_ccitt sg >> usbhid hid ff_memless ehci_hcd sd_mod ohci_hcd usbcore piix sis5513 ide_core >> edd ext3 mbcache jbd fan pata_sis libata scsi_mod thermal processor >> Nov 13 22:26:54 frank kernel: CPU: 0 >> Nov 13 22:26:54 frank kernel: EIP: 0060:[<c0266de0>] Tainted: G N >> VLI >> Nov 13 22:26:54 frank kernel: EFLAGS: 00200287 (2.6.22.12-0.1-default #1) >> Nov 13 22:26:54 frank kernel: EIP is at sys_socketcall+0x21/0x261 >> Nov 13 22:26:54 frank kernel: eax: 00000001 ebx: 0000000c ecx: 00000001 >> edx: ffffffea >> Nov 13 22:26:54 frank kernel: esi: bfdaa27c edi: 00000000 ebp: ef1b8000 >> esp: ef1b9f78 >> Nov 13 22:26:54 frank kernel: ds: 007b es: 007b fs: 00d8 gs: 0033 ss: >> 0068 >> Nov 13 22:26:54 frank kernel: Process ip (pid: 4350, ti=ef1b8000 >> task=f3d4eab0 >> task.ti=ef1b8000) >> Nov 13 22:26:54 frank kernel: Stack: 40000003 00000000 f3d4ebd8 08073160 >> bfdaa140 ef1b9fb8 00000000 c0107e49 >> Nov 13 22:26:54 frank kernel: bfdaa140 08073160 bfdaa27c 00000001 >> 00000001 bfdaa27c 08073184 c0104ea2 >> Nov 13 22:26:54 frank kernel: 00000001 bfdaa140 08073160 bfdaa27c >> 08073184 bfdaa178 ffffffda 0000007b >> Nov 13 22:26:54 frank kernel: Call Trace: >> Nov 13 22:26:54 frank kernel: [<c0107e49>] do_syscall_trace+0x12c/0x173 >> Nov 13 22:26:54 frank kernel: [<c0104ea2>] syscall_call+0x7/0xb >> Nov 13 22:26:54 frank kernel: ======================= >> Nov 13 22:26:54 frank kernel: Code: c4 94 00 00 00 5b 5e 5f 5d c3 57 ba ea >> ff >> ff ff 56 53 83 ec 30 8b 44 24 40 8d 78 ff 83 ff 10 0f 87 >> 3d 02 00 00 8a 98 68 32 2e c0 <8d> 74 24 18 8b 54 24 44 89 f0 0f b6 cb e8 >> 2a >> 9b f6 ff ba f2 ff >> Nov 13 22:26:54 frank kernel: EIP: [<c0266de0>] sys_socketcall+0x21/0x261 >> SS:ESP 0068:ef1b9f78 >> >> > > hm, I see no divide instruction near the start of 2.6.22's > sys_socketcall(). I'm wondering if some patch which opensuse has added is > causing this. If you have the source handy can you show us what it looks > like? > That's net/socket.c, the 50-odd lines after > > asmlinkage long sys_socketcall(int call, unsigned long __user *args) > > > What caused the kernel taint, btw? Taint N is a SUSE patch for "unsupported module loaded".
Reply-To: jnelson@jamponi.net The only divide operation I see is contained herein, but for completeness I include the entire function. /* * System call vectors. * * Argument checking cleaned up. Saved 20% in size. * This function doesn't need to set the kernel lock because * it is set by the callees. */ asmlinkage long sys_socketcall(int call, unsigned long __user *args) { unsigned long a[6]; unsigned long a0, a1; int err; if (call < 1 || call > SYS_RECVMSG) return -EINVAL; /* copy_from_user should be SMP safe. */ if (copy_from_user(a, args, nargs[call])) return -EFAULT; err = audit_socketcall(nargs[call] / sizeof(unsigned long), a); if (err) return err; a0 = a[0]; a1 = a[1]; switch (call) { case SYS_SOCKET: err = sys_socket(a0, a1, a[2]); break; case SYS_BIND: err = sys_bind(a0, (struct sockaddr __user *)a1, a[2]); break; case SYS_CONNECT: err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]); break; case SYS_LISTEN: err = sys_listen(a0, a1); break; case SYS_ACCEPT: err = sys_accept(a0, (struct sockaddr __user *)a1, (int __user *)a[2]); break; case SYS_GETSOCKNAME: err = sys_getsockname(a0, (struct sockaddr __user *)a1, (int __user *)a[2]); break; case SYS_GETPEERNAME: err = sys_getpeername(a0, (struct sockaddr __user *)a1, (int __user *)a[2]); break; case SYS_SOCKETPAIR: err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]); break; case SYS_SEND: err = sys_send(a0, (void __user *)a1, a[2], a[3]); break; case SYS_SENDTO: err = sys_sendto(a0, (void __user *)a1, a[2], a[3], (struct sockaddr __user *)a[4], a[5]); break; case SYS_RECV: err = sys_recv(a0, (void __user *)a1, a[2], a[3]); break; case SYS_RECVFROM: err = sys_recvfrom(a0, (void __user *)a1, a[2], a[3], (struct sockaddr __user *)a[4], (int __user *)a[5]); break; case SYS_SHUTDOWN: err = sys_shutdown(a0, a1); break; case SYS_SETSOCKOPT: err = sys_setsockopt(a0, a1, a[2], (char __user *)a[3], a[4]); break; case SYS_GETSOCKOPT: err = sys_getsockopt(a0, a1, a[2], (char __user *)a[3], (int __user *)a[4]); break; case SYS_SENDMSG: err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]); break; case SYS_RECVMSG: err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]); break; default: err = -EINVAL; break; } return err; } On 11/13/07, bugme-daemon@bugzilla.kernel.org <bugme-daemon@bugzilla.kernel.org> wrote: > http://bugzilla.kernel.org/show_bug.cgi?id=9375 > > > > > > ------- Comment #2 from randy.dunlap@oracle.com 2007-11-13 21:27 ------- > bugme-daemon@bugzilla.kernel.org wrote: > > http://bugzilla.kernel.org/show_bug.cgi?id=9375 > > > > > > > > > > > > ------- Comment #1 from anonymous@kernel-bugs.osdl.org 2007-11-13 21:19 > ------- > > Reply-To: akpm@linux-foundation.org > > > > > > (plesae respond via emailed reply-to-all) > > > > On Tue, 13 Nov 2007 20:48:44 -0800 (PST) bugme-daemon@bugzilla.kernel.org > > wrote: > > > >> http://bugzilla.kernel.org/show_bug.cgi?id=9375 > >> > >> Summary: divide error: 0000 [#1] with VIA Velocity when > unplugged > >> Product: Other > >> Version: 2.5 > >> KernelVersion: 2.6.22.12 (openSUSE 10.3) > >> Platform: All > >> OS/Version: Linux > >> Tree: Mainline > >> Status: NEW > >> Severity: normal > >> Priority: P1 > >> Component: Other > >> AssignedTo: other_other@kernel-bugs.osdl.org > >> ReportedBy: jnelson-kernel-bugzilla@jamponi.net > >> > >> > >> Most recent kernel where this bug did not occur: I've never seen it > before. > >> Distribution: openSUSE 10.3 > >> Hardware Environment: AMD Athlon 2200+ > >> Software Environment: openSUSE 10.3 > >> Problem Description: I unplugged my VIA Velocity and plugged it back into > a > >> switch and shortly thereafter it gacked. > >> > >> I ran 'ip -s -s link show dev eth1' which sigsegd (this machine has been > rock > >> solid for YEARS so I know it's not the hardware) and the machine locked > up. The > >> blinkenlights on the switch continued to blink but according to tcpdump no > >> traffic was flowing from this machine. A reboot later confirmed a problem > and I > >> found this in the /var/log/messages file: > >> > >> > >> Nov 13 22:26:54 frank kernel: divide error: 0000 [#1] > >> Nov 13 22:26:54 frank kernel: SMP > >> Nov 13 22:26:54 frank kernel: last sysfs file: /block/drbd0/range > >> Nov 13 22:26:54 frank kernel: Modules linked in: drbd xt_tcpudp xt_pkttype > >> ipt_LOG xt_limit snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device nfs > lockd > >> nfs_acl sunrpc af_packet ipt_REJECT xt_state iptable_mangle iptable_nat > nf_nat > >> iptable_filter nf_conntrack_ipv4 nf_conntrack nfnetlink ip_tables > ip6_tables > >> x_tables tcp_bic apparmor dm_crypt loop dm_mirror dm_log dm_mod > snd_intel8x0 > >> snd_ac97_codec ac97_bus snd_pcm snd_timer snd i2c_sis96x soundcore > parport_pc > >> button sr_mod via_velocity sis_agp rtc_cmos shpchp i2c_sis630 cdrom i2c_co > >> re parport agpgart snd_page_alloc rtc_core rtc_lib pci_hotplug crc_ccitt > sg > >> usbhid hid ff_memless ehci_hcd sd_mod ohci_hcd usbcore piix sis5513 > ide_core > >> edd ext3 mbcache jbd fan pata_sis libata scsi_mod thermal processor > >> Nov 13 22:26:54 frank kernel: CPU: 0 > >> Nov 13 22:26:54 frank kernel: EIP: 0060:[<c0266de0>] Tainted: G > N > >> VLI > >> Nov 13 22:26:54 frank kernel: EFLAGS: 00200287 (2.6.22.12-0.1-default > #1) > >> Nov 13 22:26:54 frank kernel: EIP is at sys_socketcall+0x21/0x261 > >> Nov 13 22:26:54 frank kernel: eax: 00000001 ebx: 0000000c ecx: > 00000001 > >> edx: ffffffea > >> Nov 13 22:26:54 frank kernel: esi: bfdaa27c edi: 00000000 ebp: > ef1b8000 > >> esp: ef1b9f78 > >> Nov 13 22:26:54 frank kernel: ds: 007b es: 007b fs: 00d8 gs: 0033 > ss: > >> 0068 > >> Nov 13 22:26:54 frank kernel: Process ip (pid: 4350, ti=ef1b8000 > task=f3d4eab0 > >> task.ti=ef1b8000) > >> Nov 13 22:26:54 frank kernel: Stack: 40000003 00000000 f3d4ebd8 08073160 > >> bfdaa140 ef1b9fb8 00000000 c0107e49 > >> Nov 13 22:26:54 frank kernel: bfdaa140 08073160 bfdaa27c 00000001 > >> 00000001 bfdaa27c 08073184 c0104ea2 > >> Nov 13 22:26:54 frank kernel: 00000001 bfdaa140 08073160 bfdaa27c > >> 08073184 bfdaa178 ffffffda 0000007b > >> Nov 13 22:26:54 frank kernel: Call Trace: > >> Nov 13 22:26:54 frank kernel: [<c0107e49>] do_syscall_trace+0x12c/0x173 > >> Nov 13 22:26:54 frank kernel: [<c0104ea2>] syscall_call+0x7/0xb > >> Nov 13 22:26:54 frank kernel: ======================= > >> Nov 13 22:26:54 frank kernel: Code: c4 94 00 00 00 5b 5e 5f 5d c3 57 ba ea > ff > >> ff ff 56 53 83 ec 30 8b 44 24 40 8d 78 ff 83 ff 10 0f 87 > >> 3d 02 00 00 8a 98 68 32 2e c0 <8d> 74 24 18 8b 54 24 44 89 f0 0f b6 cb e8 > 2a > >> 9b f6 ff ba f2 ff > >> Nov 13 22:26:54 frank kernel: EIP: [<c0266de0>] sys_socketcall+0x21/0x261 > >> SS:ESP 0068:ef1b9f78 > >> > >> > > > > hm, I see no divide instruction near the start of 2.6.22's > > sys_socketcall(). I'm wondering if some patch which opensuse has added is > > causing this. If you have the source handy can you show us what it looks > like? > > That's net/socket.c, the 50-odd lines after > > > > asmlinkage long sys_socketcall(int call, unsigned long __user *args) > > > > > > What caused the kernel taint, btw? > > Taint N is a SUSE patch for "unsupported module loaded". > > > -- > Configure bugmail: http://bugzilla.kernel.org/userprefs.cgi?tab=email > ------- You are receiving this mail because: ------- > You reported the bug, or are watching the reporter. >
the faulting instruction: <8d> 74 24 18 is a lea 0x18(%esp),%esi. Such an instruction cannot cause a divide error exception. my guesses are: hw flakiness, attempted rootkit install or unsupported module doing weird stuff. I'm closing this as non-reproducible, unless someone can reproduce it with an untainted kernel.