>Number: 155658
>Category: kern
>Synopsis: amr_ioctl(): call of malloc() causes memory corruption and
>panic
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Mar 18 11:50:08 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator: Andreas Longwitz <[email protected]>
>Release: FreeBSD 8.2-RELEASE i386
>Organization:
Data Service Stockelsdorf
>Environment:
System: FreeBSD dssresv2.incore 8.2-RELEASE FreeBSD 8.2-RELEASE #0: Mon Mar 14
10:02:35 CET 2011 [email protected]:/usr/src/sys/i386/compile/SERVER
i386
>Description:
The syscall of amr_ioctl() used by megarc corrupts every system running
FreeBSD 7.x or FreeBSD 8.x, if there is activity on the disks controlled
by amr(4). This problem is well known (ports/128082, ports/137938) and
did not exist in FreeBSD 6.x.
A kernel with WITNESS and INVARIANTS most of the time stops quickly
with panic after megarc is started on a busy sytem.
In the following example one of two processes running bsdtar crashes
(pid 4337),
the megarc process running amr_ioctl() has pid 4343. I used serial
console to
enter some ddb commands:
Kernel page fault with the following non-sleepable locks held:
exclusive sleep mutex FFS2 dinode (UMA zone) r = 0 (0xc9ea9388)
locked @ vm/uma_core.c:2013
KDB: stack backtrace:
db_trace_self_wrapper(c09504cb,ea02a69c,246,ca672904,c9506ed0,...)
at db_trace_self_wrapper+0x26
kdb_backtrace(7dd,3,ffffffff,c0b50704,ea02a700,...) at
kdb_backtrace+0x2a
_witness_debugger(c0952aac,ea02a714,4,1,0,...) at
_witness_debugger+0x25
witness_warn(5,0,c097bdeb,ea02a770,ca1c0550,...) at
witness_warn+0x1fe
trap(ea02a79c) at trap+0x164
calltrap() at calltrap+0x6
--- trap 0xc, eip = 0xc084f8ce, esp = 0xea02a7dc, ebp = 0xea02a7f0
---
uma_dbg_alloc(c9ef3380,0,cb5ceb00,7dd,0,...) at uma_dbg_alloc+0x4e
uma_zalloc_arg(c9ef3380,0,2,4000,0,...) at uma_zalloc_arg+0xea
ffs_vgetf(ca0c8b40,46d5fe,80000,ea02a9e8,0,...) at ffs_vgetf+0x41c
ffs_vget(ca0c8b40,46d5fe,80000,ea02a9e8,c0746def,...) at
ffs_vget+0x2e
ffs_valloc(cb39a968,41ed,c9969d00,ea02a9e8,c09dfba0,...) at
ffs_valloc+0x4f1
ufs_mkdir(ea02abf8,c0980823,0,ea02ab3c,ea02aba4,...) at
ufs_mkdir+0xb9
VOP_MKDIR_APV(c09c6320,ea02abf8,2,0,0,...) at VOP_MKDIR_APV+0xc5
kern_mkdirat(ca6f9b40,ffffff9c,88496100,0,1ed,...) at
kern_mkdirat+0x1f7
kern_mkdir(ca6f9b40,88496100,0,1ed,ea02ac7c,...) at kern_mkdir+0x2e
mkdir(ca6f9b40,ea02acec,ea02ad28,c0951e3d,0,...) at mkdir+0x29
syscallenter(ca6f9b40,ea02ace4,ea02ace4,2,c0a11610,...) at
syscallenter+0x246
syscall(ea02ad28) at syscall+0x4f
Xint0x80_syscall() at Xint0x80_syscall+0x21
--- syscall (136, FreeBSD ELF32, mkdir), eip = 0x8835d433, esp =
0xbfbfe88c, ebp = 0xbfbfe8b8 ---
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address = 0x50
fault code = supervisor read, page not present
instruction pointer = 0x20:0xc084f8ce
stack pointer = 0x28:0xea02a7dc
frame pointer = 0x28:0xea02a7f0
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 4337 (bsdtar)
[thread pid 4337 tid 100181 ]
Stopped at uma_dbg_alloc+0x4e: divl 0x50(%esi),%eax
db> show allpcpu
Current CPU: 0
cpuid = 0
dynamic pcpu = 0x644b00
curthread = 0xca6f9b40: pid 4337 "bsdtar"
curpcb = 0xea02ad80
fpcurthread = none
idlethread = 0xc9547000: tid 100006 "idle: cpu0"
APIC ID = 0
currentldt = 0x50
spin locks held:
cpuid = 1
dynamic pcpu = 0x68eab00
curthread = 0xc95472d0: pid 11 "idle: cpu1"
curpcb = 0xc72f1d80
fpcurthread = none
idlethread = 0xc95472d0: tid 100005 "idle: cpu1"
APIC ID = 1
currentldt = 0x50
spin locks held:
cpuid = 2
dynamic pcpu = 0x68edb00
curthread = 0xc97c72d0: pid 21 "bufdaemon"
curpcb = 0xe7c2dd80
fpcurthread = none
idlethread = 0xc95475a0: tid 100004 "idle: cpu2"
APIC ID = 6
currentldt = 0x50
spin locks held:
exclusive spin mutex uart_hwmtx (uart_hwmtx) r = 0 (0xc97e5120)
locked @ dev/uart/uart_cpu.h:92
cpuid = 3
dynamic pcpu = 0x68f0b00
curthread = 0xca0cab40: pid 4343 "megarc"
curpcb = 0xe9f2fd80
fpcurthread = none
idlethread = 0xc9547870: tid 100003 "idle: cpu3"
APIC ID = 7
currentldt = 0x50
spin locks held:
exclusive spin mutex smp rendezvous (smp rendezvous) r = 0
(0xc0a244f4) locked @ i386/i386/mp_machdep.c:1165
db> trace
Tracing pid 4337 tid 100181 td 0xca6f9b40
uma_dbg_alloc(c9ef3380,0,cb5ceb00,7dd,0,...) at uma_dbg_alloc+0x4e
uma_zalloc_arg(c9ef3380,0,2,4000,0,...) at uma_zalloc_arg+0xea
ffs_vgetf(ca0c8b40,46d5fe,80000,ea02a9e8,0,...) at ffs_vgetf+0x41c
ffs_vget(ca0c8b40,46d5fe,80000,ea02a9e8,c0746def,...) at
ffs_vget+0x2e
ffs_valloc(cb39a968,41ed,c9969d00,ea02a9e8,c09dfba0,...) at
ffs_valloc+0x4f1
ufs_mkdir(ea02abf8,c0980823,0,ea02ab3c,ea02aba4,...) at
ufs_mkdir+0xb9
VOP_MKDIR_APV(c09c6320,ea02abf8,2,0,0,...) at VOP_MKDIR_APV+0xc5
kern_mkdirat(ca6f9b40,ffffff9c,88496100,0,1ed,...) at
kern_mkdirat+0x1f7
kern_mkdir(ca6f9b40,88496100,0,1ed,ea02ac7c,...) at kern_mkdir+0x2e
mkdir(ca6f9b40,ea02acec,ea02ad28,c0951e3d,0,...) at mkdir+0x29
syscallenter(ca6f9b40,ea02ace4,ea02ace4,2,c0a11610,...) at
syscallenter+0x246
syscall(ea02ad28) at syscall+0x4f
Xint0x80_syscall() at Xint0x80_syscall+0x21
--- syscall (136, FreeBSD ELF32, mkdir), eip = 0x8835d433, esp =
0xbfbfe88c, ebp = 0xbfbfe8b8 ---
Some other trace information:
Tracing command megarc pid 4343 tid 100129 td 0xca0cab40
cpustop_handler(8,e9f2f854,c08c6cb6,c06f8e3b,c094e5fd,...) at
cpustop_handler+0x34
ipi_nmi_handler(c06f8e3b,c094e5fd,c0944b18,3,ca0c0aa0,...) at
ipi_nmi_handler+0x2f
trap(e9f2f860) at trap+0x36
calltrap() at calltrap+0x6
--- trap 0x13, eip = 0xc08bc2c8, esp = 0xe9f2f8a0, ebp = 0xe9f2f8c0
---
smp_tlb_shootdown(e9f2f8e0,c08bf168,cb5d0000,c0bceea0,0,...) at
smp_tlb_shootdown+0x98
smp_invlpg(cb5d0000,c0bceea0,0,bff2d740,e9f2f908,...) at
smp_invlpg+0x1e
pmap_invalidate_page(c0bceea0,cb5d0000,c097a99a,aab,cb5d0000,...) at
pmap_invalidate_page+0x38
pmap_remove_pte(e9f2f928,0,c097a99a,aeb,c0bceea0,...) at
pmap_remove_pte+0x84
pmap_remove(c0bceea0,cb5d0000,cb5d7000,0,c096ee82,...) at
pmap_remove+0x17a
vm_map_delete(c158f08c,cb5d0000,cb5d7000,cb557b18,7000,...) at
vm_map_delete+0x1a5
vm_map_remove(c158f08c,cb5d0000,cb5d7000,e9f2f9f0,c084b4c6,...) at
vm_map_remove+0x51
kmem_free(c158f08c,cb5d0000,7000,e9f2fa08,c084c558,...) at
kmem_free+0x30
page_free(cb5d0000,7000,22,cb5d0000,e9f2fa2c,...) at page_free+0x46
uma_large_free(cb557b18,4,c094b615,cb5d0000,0,...) at
uma_large_free+0x88
free(cb5d0000,c0992b90,c092a81c,3a3,c06f8edc,...) at free+0x10f
amr_ioctl(c96dab00,c0304301,ca8b2380,1,ca0cab40,...) at
amr_ioctl+0xb6b
giant_ioctl(c96dab00,c0304301,ca8b2380,1,ca0cab40,...) at
giant_ioctl+0x75
devfs_ioctl_f(ca0bece8,c0304301,ca8b2380,c9969d00,ca0cab40,...) at
devfs_ioctl_f+0x10b
kern_ioctl(ca0cab40,3,c0304301,ca8b2380,1f2fcec,...) at
kern_ioctl+0x1fd
ioctl(ca0cab40,e9f2fcec,e9f2fd28,c0951e3d,0,...) at ioctl+0x134
syscallenter(ca0cab40,e9f2fce4,e9f2fce4,0,c0a11610,...) at
syscallenter+0x246
syscall(e9f2fd28) at syscall+0x4f
Xint0x80_syscall() at Xint0x80_syscall+0x21
--- syscall (54, FreeBSD ELF32, ioctl), eip = 0x8079d2f, esp =
0xbfbfe91c, ebp = 0xbfbfe988 ---
Tracing command bsdtar pid 4337 tid 100181 td 0xca6f9b40
uma_dbg_alloc(c9ef3380,0,cb5ceb00,7dd,0,...) at uma_dbg_alloc+0x4e
uma_zalloc_arg(c9ef3380,0,2,4000,0,...) at uma_zalloc_arg+0xea
ffs_vgetf(ca0c8b40,46d5fe,80000,ea02a9e8,0,...) at ffs_vgetf+0x41c
ffs_vget(ca0c8b40,46d5fe,80000,ea02a9e8,c0746def,...) at
ffs_vget+0x2e
ffs_valloc(cb39a968,41ed,c9969d00,ea02a9e8,c09dfba0,...) at
ffs_valloc+0x4f1
ufs_mkdir(ea02abf8,c0980823,0,ea02ab3c,ea02aba4,...) at
ufs_mkdir+0xb9
VOP_MKDIR_APV(c09c6320,ea02abf8,2,0,0,...) at VOP_MKDIR_APV+0xc5
kern_mkdirat(ca6f9b40,ffffff9c,88496100,0,1ed,...) at
kern_mkdirat+0x1f7
kern_mkdir(ca6f9b40,88496100,0,1ed,ea02ac7c,...) at kern_mkdir+0x2e
mkdir(ca6f9b40,ea02acec,ea02ad28,c0951e3d,0,...) at mkdir+0x29
syscallenter(ca6f9b40,ea02ace4,ea02ace4,2,c0a11610,...) at
syscallenter+0x246
syscall(ea02ad28) at syscall+0x4f
Xint0x80_syscall() at Xint0x80_syscall+0x21
--- syscall (136, FreeBSD ELF32, mkdir), eip = 0x8835d433, esp =
0xbfbfe88c, ebp = 0xbfbfe8b8 ---
Tracing command sh pid 4336 tid 100173 td 0xca6fb5a0
sched_switch(ca6fb5a0,0,104,191,6e571642,...) at sched_switch+0x389
mi_switch(104,0,c09515f9,1eb,5c,...) at mi_switch+0x200
sleepq_switch(ca6fb5a0,0,c09515f9,1a0,5c,...) at sleepq_switch+0x15f
sleepq_catch_signals(c09515f9,160,0,100,100,...) at
sleepq_catch_signals+0xb5
sleepq_wait_sig(ca6eaaa0,5c,c0953eca,100,0,...) at
sleepq_wait_sig+0x17
_sleep(ca6eaaa0,ca6eab28,15c,c0953eca,0,...) at _sleep+0x35c
kern_wait(ca6fb5a0,ffffffff,ea00ec44,2,0,...) at kern_wait+0xb76
wait4(ca6fb5a0,ea00ecec,ea00ed28,c0951e3d,0,...) at wait4+0x3b
syscallenter(ca6fb5a0,ea00ece4,ea00ece4,0,c0a11610,...) at
syscallenter+0x246
syscall(ea00ed28) at syscall+0x4f
Xint0x80_syscall() at Xint0x80_syscall+0x21
--- syscall (7, FreeBSD ELF32, wait4), eip = 0x8815cfbb, esp =
0xbfbfe8fc, ebp = 0xbfbfe918 ---
Tracing command bsdtar pid 4333 tid 100142 td 0xca1c5870
sched_switch(ca1c5870,0,104,191,f7f7cfd8,...) at sched_switch+0x389
mi_switch(104,0,c09515f9,1eb,50,...) at mi_switch+0x200
sleepq_switch(ca1c5870,0,c09515f9,260,50,...) at sleepq_switch+0x15f
sleepq_wait(db7b01a0,50,c0958ef4,4,0,...) at sleepq_wait+0x63
__lockmgr_args(db7b01a0,81900,ca672904,c0958ef4,50,...) at
__lockmgr_args+0xb1f
getblk(ca672810,46b5460,0,4000,0,...) at getblk+0x167
breadn(ca672810,46b5460,0,4000,0,...) at breadn+0x44
bread(ca672810,46b5460,0,4000,0,...) at bread+0x4c
ffs_vgetf(ca0c8b40,46d5ff,80000,e9f90918,0,...) at ffs_vgetf+0x3aa
ffs_vget(ca0c8b40,46d5ff,80000,e9f90918,e9f90858,...) at
ffs_vget+0x2e
ffs_valloc(cb32a810,81a4,c9969d00,e9f90918,e9f908fc,...) at
ffs_valloc+0x4f1
ufs_makeinode(e9f90ba4,c09c67e0,e9f90b00,e9f90a64,c08ee315,...) at
ufs_makeinode+0xa3
ufs_create(e9f90b00,c09809e9,0,0,e9f90b78,...) at ufs_create+0x30
VOP_CREATE_APV(c09c6320,e9f90b00,2,c06f8e3b,0,...) at
VOP_CREATE_APV+0xc5
vn_open_cred(e9f90b78,e9f90c2c,1a4,0,c9969d00,...) at
vn_open_cred+0x1c3
vn_open(e9f90b78,e9f90c2c,1a4,ca6079a0,0,...) at vn_open+0x3b
kern_openat(ca1c5870,ffffff9c,88496100,0,a02,...) at
kern_openat+0x125
kern_open(ca1c5870,88496100,0,a01,1a4,...) at kern_open+0x35
open(ca1c5870,e9f90cec,e9f90d28,c0951e3d,0,...) at open+0x30
syscallenter(ca1c5870,e9f90ce4,e9f90ce4,0,c094b615,...) at
syscallenter+0x246
syscall(e9f90d28) at syscall+0x4f
Xint0x80_syscall() at Xint0x80_syscall+0x21
--- syscall (5, FreeBSD ELF32, open), eip = 0x8835d473, esp =
0xbfbfe89c, ebp = 0xbfbfe8c8 ---
Tracing command bufdaemon pid 21 tid 100063 td 0xc97c72d0
cpustop_handler(4,e7c2d9e8,c08c6cb6,c,0,...) at cpustop_handler+0x34
ipi_nmi_handler(c,0,c9502340,c0b51db0,c9e02000,...) at
ipi_nmi_handler+0x2f
trap(e7c2d9f4) at trap+0x36
calltrap() at calltrap+0x6
--- trap 0x13, eip = 0xc05eba0f, esp = 0xe7c2da34, ebp = 0xe7c2da54
---
ns8250_bus_ipend(c97e5100,e7c2da7c,c06a4344,c97e5180,c97e5158,...)
at ns8250_bus_ipend+0x5f
uart_intr(c97e5100,111,2,c9e02000,c97c72d0,...) at uart_intr+0x33b
intr_event_handle(c9542d80,e7c2daf0,0,c0b87dc4,0,...) at
intr_event_handle+0x65
intr_execute_handlers(c95288d0,e7c2daf0,6,e7c2db4c,c08ad725,...) at
intr_execute_handlers+0x49
lapic_handle_intr(30,e7c2daf0) at lapic_handle_intr+0x4c
Xapic_isr1() at Xapic_isr1+0x35
--- interrupt, eip = 0xc06a4929, esp = 0xe7c2db30, ebp = 0xe7c2db4c
---
_mtx_lock_sleep(c0b87dc4,c97c72d0,0,c09583d4,e3f,...) at
_mtx_lock_sleep+0x99
_mtx_lock_flags(c0b87dc4,0,c09583d4,e3f,cb42f990,...) at
_mtx_lock_flags+0xf7
vfs_busy_pages(db4ec8e8,1,df,1800,0,...) at vfs_busy_pages+0xab
bufwrite(db4ec8e8,0,c09583d4,6c8,c095aeb2,...) at bufwrite+0xa7
vfs_bio_awrite(db4ec8e8,0,c09583d4,92b,0,...) at vfs_bio_awrite+0x318
flushbufqueues(ce,c094b615,c9e02088,0,0,...) at flushbufqueues+0x5b0
buf_do_flush(c9e02000,0,c09583d4,897,64,...) at buf_do_flush+0x19
buf_daemon(0,e7c2dd28,c0948386,345,c9e02000,...) at buf_daemon+0xba
fork_exit(c07304b0,0,e7c2dd28) at fork_exit+0xb8
fork_trampoline() at fork_trampoline+0x8
--- trap 0, eip = 0, esp = 0xe7c2dd60, ebp = 0 ---
db> ps
pid ppid pgrp uid state wmesg wchan cmd
4343 4329 4321 0 R+ CPU 3 megarc
4337 4336 4321 0 R+ CPU 0 bsdtar
4336 4324 4321 0 S+ wait 0xca6eaaa0 sh
4333 4331 4321 0 S+ getblk 0xdb7b01a0 bsdtar
4331 4324 4321 0 S+ wait 0xca6ea000 sh
4329 4327 4321 0 S+ wait 0xca6ea2a8 sh
4327 4324 4321 0 S+ wait 0xca1bed48 sh
4324 4322 4321 0 S+ wait 0xca1c0000 sh
4322 1 4321 0 S+ wait 0xc9f462a8 sh
4310 4309 4310 0 S+ ttyin 0xca243a70 sh
4309 4305 4309 1003 S+ wait 0xc9ebfaa0 su
4305 4304 4305 1003 Ss+ wait 0xc9f18d48 bash
4304 4302 4302 1003 S select 0xca23ad64 sshd
4302 3695 4302 0 Ss sbwait 0xca451a60 sshd
4162 1 4162 0 Ss+ ttyin 0xc967ec70 getty
4161 1 4161 0 Ss+ ttyin 0xc97f7870 getty
4160 1 4160 0 Ss+ ttyin 0xc97f7a70 getty
4159 1 4159 0 Ss+ ttyin 0xc97f7c70 getty
4158 1 4158 0 Ss+ ttyin 0xc97f7e70 getty
4157 1 4157 0 Ss+ ttyin 0xc97f8070 getty
4156 1 4156 0 Ss+ ttyin 0xc97f8270 getty
4155 1 4155 0 Ss+ ttyin 0xc967e870 getty
4123 1 4123 0 Ss select 0xc9edb5e4 inetd
3953 1 3953 25 Ss pause 0xca1bfda0 sendmail
3949 1 3949 0 Ss select 0xc996b9e4 sendmail
3913 3893 26 0 S+ nanslp 0xc0a122e4 sleep
3893 1 26 0 S+ wait 0xc9ebf7f8 sh
3854 1 3854 0 Ss nanslp 0xc0a122e4 cron
3720 3709 26 0 S+ nanslp 0xc0a122e4 sleep
3709 1 26 0 S+ wait 0xca1bf2a8 sh
3701 1 3701 0 Ss select 0xca2394a4 sshd
3695 1 3695 0 Ss select 0xc9ee75e4 sshd
3688 1 26 0 S+ piperd 0xc9f42498 sh
3687 1 26 0 S+ pause 0xc9fed5a8 top
3682 3555 3555 88 S (threaded) mysqld
100166 S ucond 0xca19c640 mysqld
100165 S sigwait 0xe9fdebb0 mysqld
100164 S ucond 0xc9ee74c0 mysqld
100071 S select 0xca23aca4 initial thread
3555 1 3555 88 Ss wait 0xca0c27f8 sh
3542 1 3542 181 Ss select 0xc9edb9e4 nrpe2
3485 1 3485 0 Ss select 0xc9ee7d24 ntpd
3267 1 3267 53 Ss (threaded) named
100163 S kqread 0xc9e92c80 named
100162 S ucond 0xca50f080 named
100161 S ucond 0xca239b80 named
100160 S ucond 0xca239240 named
100159 S ucond 0xc9ee7700 named
100158 S ucond 0xca19b8c0 named
100126 S sigwait 0xe9f26bb0 named
3179 1 3179 0 Ss select 0xc9eda8e4 syslogd
3141 0 0 0 SL - 0xc0a10198 [accounting]
2930 1 2930 0 Ss select 0xca2391e4 devd
1452 1443 1443 64 S bpf 0xc9f7e900 pflogd
1443 1 1443 0 Ss sbwait 0xc9f37728 pflogd
325 0 0 0 SL mdwait 0xc9e19800 [md0]
249 1 249 0 Ss pause 0xc9fed058 adjkerntz
25 0 0 0 SL flowclea 0xc0b7e8c0 [flowcleaner]
24 0 0 0 SL sdflush 0xc0b874e0 [softdepflush]
23 0 0 0 SL vlruwt 0xc9652aa0 [vnlru]
22 0 0 0 SL syncer 0xc0b7e6b8 [syncer]
21 0 0 0 RL CPU 2 [bufdaemon]
20 0 0 0 SL pollid 0xc0a1183c [idlepoll]
19 0 0 0 SL pgzero 0xc0b881f4 [pagezero]
18 0 0 0 SL psleep 0xc0b87e1c [vmdaemon]
17 0 0 0 SL psleep 0xc0b87de4 [pagedaemon]
16 0 0 0 SL ipmireq 0xc97f396c [ipmi0: kcs]
9 0 0 0 SL ccb_scan 0xc09e11d4 [xpt_thrd]
8 0 0 0 SL pftm 0xc04b7900 [pfpurge]
7 0 0 0 SL - 0xc973403c [fdc0]
15 0 0 0 SL (threaded) usb
100047 D - 0xc97cbdac [usbus1]
100046 D - 0xc97cbd7c [usbus1]
100045 D - 0xc97cbd4c [usbus1]
100044 D - 0xc97cbd1c [usbus1]
100042 D - 0xc97b3dac [usbus0]
100041 D - 0xc97b3d7c [usbus0]
100040 D - 0xc97b3d4c [usbus0]
100039 D - 0xc97b3d1c [usbus0]
6 0 0 0 SL idle 0xc9741000 [aic_recovery1]
5 0 0 0 SL idle 0xc96f5000 [aic_recovery0]
14 0 0 0 SL - 0xc0a12144 [yarrow]
4 0 0 0 SL - 0xc0a0f9c4 [g_down]
3 0 0 0 SL - 0xc0a0f9c0 [g_up]
2 0 0 0 SL - 0xc0a0f9b8 [g_event]
13 0 0 0 SL (threaded) ng_queue
100016 D sleep 0xc09bdf00 [ng_queue3]
100015 D sleep 0xc09bdf00 [ng_queue2]
100014 D sleep 0xc09bdf00 [ng_queue1]
100013 D sleep 0xc09bdf00 [ng_queue0]
12 0 0 0 WL (threaded) intr
100054 I [swi0: uart
uart]
100052 I [irq12: psm0]
100051 I [irq1: atkbd0]
100050 I [irq17: ichsmb0]
100049 I [irq15: ata1]
100048 I [irq14: ata0]
100043 I [irq19: uhci1]
100038 I [irq16: uhci0]
100037 I [irq24: amr0]
100033 I [irq49: ahd1]
100031 I [irq50: ahd0]
100030 I [irq9: acpi0]
100028 I [swi5: +]
100027 I [swi2: cambio]
100022 I [swi6: task
queue]
100021 I [swi6: Giant
taskq]
100012 I [swi1: netisr 0]
100011 I [swi4: clock]
100010 I [swi4: clock]
100009 I [swi4: clock]
100008 I [swi4: clock]
100007 I [swi3: vm]
11 0 0 0 RL (threaded) idle
100006 CanRun [idle: cpu0]
100005 Run CPU 1 [idle: cpu1]
100004 CanRun [idle: cpu2]
100003 CanRun [idle: cpu3]
1 0 1 0 SLs wait 0xc9545d48 [init]
10 0 0 0 SL audit_wo 0xc0b86e80 [audit]
0 0 0 0 SLs (threaded) kernel
100056 D - 0xc996c5c0 [dummynet]
100036 D - 0xc9795ac0 [em1 taskq]
100035 D - 0xc97830c0 [em0 taskq]
100029 D - 0xc96a7700 [thread taskq]
100026 D - 0xc96a78c0 [kqueue taskq]
100025 D - 0xc96a7900 [acpi_task_2]
100024 D - 0xc96a7900 [acpi_task_1]
100023 D - 0xc96a7900 [acpi_task_0]
100000 D sched 0xc0a0faa0 [swapper]
db> show lock Giant
class: sleep mutex
name: Giant
flags: {DEF, RECURSE}
state: {OWNED}
owner: 0xca0cab40 (tid 100129, pid 4343, "megarc")
db> show lockedvnods
Locked vnodes
0xcb32a810: tag ufs, type VDIR
usecount 1, writecount 0, refcount 2 mountedhere 0
flags ()
v_object 0xcb54c440 ref 0 pages 0
lock type ufs: EXCL by thread 0xca1c5870 (pid 4333)
#0 0xc069c7a5 at __lockmgr_args+0x595
#1 0xc08358b1 at ffs_lock+0xa1
#2 0xc08ed345 at VOP_LOCK1_APV+0xb5
#3 0xc0753828 at _vn_lock+0x78
#4 0xc0747c4b at vget+0xbb
#5 0xc0733a6b at cache_lookup+0x67b
#6 0xc0733c4d at vfs_cache_lookup+0xad
#7 0xc08ee4c5 at VOP_LOOKUP_APV+0xe5
#8 0xc073af6d at lookup+0x62d
#9 0xc073bd8f at namei+0x57f
#10 0xc0752e30 at vn_open_cred+0x90
#11 0xc075331b at vn_open+0x3b
#12 0xc0751ec5 at kern_openat+0x125
#13 0xc0752305 at kern_open+0x35
#14 0xc0752340 at open+0x30
#15 0xc06f2456 at syscallenter+0x246
#16 0xc08c6b9f at syscall+0x4f
#17 0xc08ad3c1 at Xint0x80_syscall+0x21
ino 4640097, on dev amrd1s1d
0xcb39a968: tag ufs, type VDIR
usecount 1, writecount 0, refcount 3 mountedhere 0
flags ()
v_object 0xcb54c550 ref 0 pages 0
lock type ufs: EXCL by thread 0xca6f9b40 (pid 4337)
#0 0xc069c7a5 at __lockmgr_args+0x595
#1 0xc08358b1 at ffs_lock+0xa1
#2 0xc08ed345 at VOP_LOCK1_APV+0xb5
#3 0xc0753828 at _vn_lock+0x78
#4 0xc0747c4b at vget+0xbb
#5 0xc0733a6b at cache_lookup+0x67b
#6 0xc0733c4d at vfs_cache_lookup+0xad
#7 0xc08ee4c5 at VOP_LOOKUP_APV+0xe5
#8 0xc073af6d at lookup+0x62d
#9 0xc073bd8f at namei+0x57f
#10 0xc074ac48 at kern_mkdirat+0x68
#11 0xc074ae7e at kern_mkdir+0x2e
#12 0xc074aea9 at mkdir+0x29
#13 0xc06f2456 at syscallenter+0x246
#14 0xc08c6b9f at syscall+0x4f
#15 0xc08ad3c1 at Xint0x80_syscall+0x21
ino 4640256, on dev amrd1s1d
0xcb5b86b8: tag ufs, type VREG
usecount 0, writecount 0, refcount 2 mountedhere 0
flags ()
v_object 0xcb42f990 ref 0 pages 2
lock type ufs: EXCL by thread 0xc97c72d0 (pid 21)
#0 0xc069ce0e at __lockmgr_args+0xbfe
#1 0xc08358b1 at ffs_lock+0xa1
#2 0xc08ed345 at VOP_LOCK1_APV+0xb5
#3 0xc0753828 at _vn_lock+0x78
#4 0xc07300cb at flushbufqueues+0x56b
#5 0xc07303c9 at buf_do_flush+0x19
#6 0xc073056a at buf_daemon+0xba
#7 0xc068b748 at fork_exit+0xb8
#8 0xc08ad3d4 at fork_trampoline+0x8
ino 4642236, on dev amrd1s1d
0xcb5c4408: tag ufs, type VNON
usecount 1, writecount 0, refcount 1 mountedhere 0
flags ()
lock type ufs: EXCL by thread 0xca6f9b40 (pid 4337)
#0 0xc069ce0e at __lockmgr_args+0xbfe
#1 0xc0830201 at ffs_vgetf+0x1e1
#2 0xc08305ae at ffs_vget+0x2e
#3 0xc08113b1 at ffs_valloc+0x4f1
#4 0xc0844369 at ufs_mkdir+0xb9
#5 0xc08ed7c5 at VOP_MKDIR_APV+0xc5
#6 0xc074add7 at kern_mkdirat+0x1f7
#7 0xc074ae7e at kern_mkdir+0x2e
#8 0xc074aea9 at mkdir+0x29
#9 0xc06f2456 at syscallenter+0x246
#10 0xc08c6b9f at syscall+0x4f
#11 0xc08ad3c1 at Xint0x80_syscall+0x21
ino 4642302, on dev amrd1s1d
0xcb582810: tag ufs, type VNON
usecount 1, writecount 0, refcount 1 mountedhere 0
flags ()
lock type ufs: EXCL by thread 0xca1c5870 (pid 4333)
#0 0xc069ce0e at __lockmgr_args+0xbfe
#1 0xc0830201 at ffs_vgetf+0x1e1
#2 0xc08305ae at ffs_vget+0x2e
#3 0xc08113b1 at ffs_valloc+0x4f1
#4 0xc0841da3 at ufs_makeinode+0xa3
#5 0xc0842540 at ufs_create+0x30
#6 0xc08ee315 at VOP_CREATE_APV+0xc5
#7 0xc0752f63 at vn_open_cred+0x1c3
#8 0xc075331b at vn_open+0x3b
#9 0xc0751ec5 at kern_openat+0x125
#10 0xc0752305 at kern_open+0x35
#11 0xc0752340 at open+0x30
#12 0xc06f2456 at syscallenter+0x246
#13 0xc08c6b9f at syscall+0x4f
#14 0xc08ad3c1 at Xint0x80_syscall+0x21
ino 4642303, on dev amrd1s1d
db> show lockchain
thread 100181 (pid 4337, bsdtar) running on CPU 0
db> show locks
exclusive sleep mutex FFS2 dinode (UMA zone) r = 0 (0xc9ea9388)
locked @ vm/uma_core.c:2013
exclusive lockmgr bufwait (bufwait) r = 0 (0xdb7b01a0) locked @
kern/vfs_bio.c:2636
exclusive lockmgr ufs (ufs) r = 0 (0xcb5c4460) locked @
ufs/ffs/ffs_vfsops.c:1515
exclusive lockmgr ufs (ufs) r = 0 (0xcb39a9c0) locked @
kern/vfs_subr.c:2120
db> show alllocks
Process 4343 (megarc) thread 0xca0cab40 (100129)
exclusive sleep mutex pmap (pmap) r = 0 (0xc0bceea0) locked @
i386/i386/pmap.c:2795
exclusive sleep mutex vm page queue mutex (vm page queue mutex) r =
0 (0xc0b87dc4) locked @ i386/i386/pmap.c:2793
exclusive sleep mutex system map (system map) r = 0 (0xc158f0e8)
locked @ vm/vm_map.c:2844
exclusive sleep mutex Giant (Giant) r = 0 (0xc0a11610) locked @
kern/kern_conf.c:427
Process 4337 (bsdtar) thread 0xca6f9b40 (100181)
exclusive sleep mutex FFS2 dinode (UMA zone) r = 0 (0xc9ea9388)
locked @ vm/uma_core.c:2013
exclusive lockmgr bufwait (bufwait) r = 0 (0xdb7b01a0) locked @
kern/vfs_bio.c:2636
exclusive lockmgr ufs (ufs) r = 0 (0xcb5c4460) locked @
ufs/ffs/ffs_vfsops.c:1515
exclusive lockmgr ufs (ufs) r = 0 (0xcb39a9c0) locked @
kern/vfs_subr.c:2120
Process 4333 (bsdtar) thread 0xca1c5870 (100142)
exclusive lockmgr ufs (ufs) r = 0 (0xcb582868) locked @
ufs/ffs/ffs_vfsops.c:1515
exclusive lockmgr ufs (ufs) r = 0 (0xcb32a868) locked @
kern/vfs_subr.c:2120
Process 4302 (sshd) thread 0xca1c4870 (100147)
exclusive sx so_rcv_sx (so_rcv_sx) r = 0 (0xca451a34) locked @
kern/uipc_sockbuf.c:148
Process 1443 (pflogd) thread 0xc9f50870 (100082)
exclusive sx so_rcv_sx (so_rcv_sx) r = 0 (0xc9f376fc) locked @
kern/uipc_sockbuf.c:148
Process 21 (bufdaemon) thread 0xc97c72d0 (100063)
exclusive sleep mutex vm object (standard object) r = 0 (0xcb42f990)
locked @ kern/vfs_bio.c:3641
exclusive lockmgr ufs (ufs) r = 0 (0xcb5b8710) locked @
kern/vfs_bio.c:2346
exclusive lockmgr bufwait (bufwait) r = 0 (0xdb4ec948) locked @
kern/vfs_bio.c:2299
I can give more ddb output. A crash dump was not possible because
"Fatal double fault".
>How-To-Repeat:
Run some disk I/O intensive jobs on a disk contolled by amr(4) and
start megarc in a loop.
>Fix:
My dirty workaround replaces malloc/free in amr_ioctl() by a static
buffer big enough for all megarc parameter. Of course only one
megarc command is allowed to run at any time, but thats ok for me
at the moment.
--- /usr/src/sys/dev/amr/amr.c.orig 2010-12-21 18:09:25.000000000
+0100
+++ /usr/src/sys/dev/amr/amr.c 2011-03-17 10:15:09.000000000
+0100
@@ -164,6 +164,8 @@
/*
* Debugging
*/
+#define MAX_AMR_IOCTL 25600 /* observed: 25412 */
+static char amr_ioctl_buf[MAX_AMR_IOCTL];
static void amr_describe_controller(struct amr_softc *sc);
#ifdef AMR_DEBUG
#if 0
@@ -843,12 +845,13 @@
/* handle inbound data buffer */
if (au_length != 0 && au_cmd[0] != 0x06) {
- if ((dp = malloc(au_length, M_AMR, M_WAITOK|M_ZERO)) == NULL) {
+ if (au_length >= MAX_AMR_IOCTL) {
error = ENOMEM;
goto out;
}
+ memset(&amr_ioctl_buf, '\0', MAX_AMR_IOCTL);
+ dp = amr_ioctl_buf;
if ((error = copyin(au_buffer, dp, au_length)) != 0) {
- free(dp, M_AMR);
return (error);
}
debug(2, "copyin %ld bytes from %p -> %p", au_length,
au_buffer, dp);
@@ -929,8 +932,6 @@
if (ac != NULL)
amr_releasecmd(ac);
mtx_unlock(&sc->amr_list_lock);
- if (dp != NULL)
- free(dp, M_AMR);
#ifndef LSI
if (logical_drives_changed)
>Release-Note:
>Audit-Trail:
>Unformatted:
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