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af80b2c901
freebsd-dev/sys/kern
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Konstantin Belousov af80b2c901 The userland_sysctl() function retries sysctl_root() until returned 
error is not EAGAIN. Several sysctls that inspect another process use
p_candebug() for checking access right for the curproc. p_candebug()
returns EAGAIN for some reasons, in particular, for the process doing
exec() now. If execing process tries to lock Giant, we get a livelock,
because sysctl handlers are covered by Giant, and often do not sleep.

Break the livelock by dropping Giant and allowing other threads to
execute in the EAGAIN loop.

Also, do not return EAGAIN from p_candebug() when process is executing,
use more appropriate EBUSY error [1].

Reported and tested by:	pho
Suggested by:	rwatson [1]
Reviewed by:	rwatson, des
MFC after:	1 week
2008-12-12 12:06:28 +00:00
..
bus_if.m Allow device hints to wire the unit numbers of devices. 2008-11-18 21:01:54 +00:00
clock_if.m
cpufreq_if.m
device_if.m
genassym.sh refactor code so it can run in a chroot without having to have /dev/mounted 2008-01-18 17:02:14 +00:00
imgact_aout.c Add sv_flags field to struct sysentvec with intention to provide description 2008-11-22 12:36:15 +00:00
imgact_elf32.c
imgact_elf64.c
imgact_elf.c If the ABI-overriden interpreter was not loaded, do not set 2008-10-08 11:11:36 +00:00
imgact_gzip.c VOP_LOCK1() (and so VOP_LOCK()) and VOP_UNLOCK() are only used in 2008-01-13 14:44:15 +00:00
imgact_shell.c Decontextualize the couplet VOP_GETATTR / VOP_SETATTR as the passed thread 2008-08-28 15:23:18 +00:00
inflate.c
init_main.c Rename three MAC entry points from _proc_ to _cred_ to reflect the fact 2008-10-28 11:33:06 +00:00
init_sysent.c Regenerate system call tables for r184789. 2008-11-09 10:48:06 +00:00
kern_acct.c Properly lock proctree_lock before locking the process while accounting. 2008-08-21 15:02:17 +00:00
kern_alq.c Use msleep_spin() instead of unlock/tsleep/lock. This was 2008-07-02 20:44:33 +00:00
kern_clock.c Implement per-cpu callout threads, wheels, and locks. 2008-04-02 11:20:30 +00:00
kern_condvar.c - Don't do a WITNESS_SAVE() on the interlock if it is Giant in the condition 2008-09-25 13:42:19 +00:00
kern_conf.c Explicitely note that destroy_dev() sleeps. 2008-11-27 16:47:25 +00:00
kern_cons.c Reimplement the /dev/console device node. 2008-11-01 08:35:28 +00:00
kern_context.c
kern_cpu.c Fix a few edge cases with error handling in cpufreq(4)'s CPUFREQ_GET() 2008-05-05 19:13:52 +00:00
kern_cpuset.c MFp4: 2008-11-29 14:32:14 +00:00
kern_ctf.c Add the CTF source file which gets shared with link_elf.c and link_elf_obj.c. 2008-05-23 03:04:27 +00:00
kern_descrip.c Merge user/peter/kinfo branch as of r185547 into head. 2008-12-02 06:50:26 +00:00
kern_dtrace.c Remove code that isn't required. It actually breaks the case where KDTRACE_HOOKS 2008-06-16 04:44:29 +00:00
kern_environment.c Implement the following macros for completeness: 2008-07-21 15:05:25 +00:00
kern_event.c Fix a number of style issues in the MALLOC / FREE commit. I've tried to 2008-10-23 20:26:15 +00:00
kern_exec.c Several threads in a process may do vfork() simultaneously. Then, all 2008-12-05 20:50:24 +00:00
kern_exit.c Several threads in a process may do vfork() simultaneously. Then, all 2008-12-05 20:50:24 +00:00
kern_fork.c Several threads in a process may do vfork() simultaneously. Then, all 2008-12-05 20:50:24 +00:00
kern_idle.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
kern_intr.c style(9) 2008-09-23 14:25:56 +00:00
kern_jail.c Correctly check the number of prison states to not access anything 2008-12-11 01:04:25 +00:00
kern_kthread.c Kill a dead variable 2008-08-03 21:07:19 +00:00
kern_ktr.c
kern_ktrace.c Fix a credential reference leak. [1] 2008-12-03 15:54:35 +00:00
kern_linker.c Conditionally compile out V_ globals while instantiating the appropriate 2008-12-10 23:12:39 +00:00
kern_lock.c Teach WITNESS about the interlocks used with lockmgr. This removes a bunch 2008-09-10 19:13:30 +00:00
kern_lockf.c Remove unused variable. 2008-11-27 04:40:37 +00:00
kern_malloc.c Enable the creation of a kmem map larger than 4GB. 2008-07-05 19:34:33 +00:00
kern_mbuf.c Make sure nmbclusters are initialized before maxsockets 2008-12-10 22:17:09 +00:00
kern_mib.c Step 1.5 of importing the network stack virtualization infrastructure 2008-10-02 15:37:58 +00:00
kern_module.c When the SYSINIT() to load a module invokes the MOD_LOAD event successfully, 2008-12-05 16:47:30 +00:00
kern_mtxpool.c Fix a number of style issues in the MALLOC / FREE commit. I've tried to 2008-10-23 20:26:15 +00:00
kern_mutex.c Teach WITNESS about the interlocks used with lockmgr. This removes a bunch 2008-09-10 19:13:30 +00:00
kern_ntptime.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
kern_osd.c Update ZFS from version 6 to 13 and bring some FreeBSD-specific changes. 2008-11-17 20:49:29 +00:00
kern_physio.c
kern_pmc.c Support sparsely numbered CPUs. 2008-09-22 10:37:02 +00:00
kern_poll.c Order #includes - also to reduce diffs with vimage branches in p4. 2008-12-11 16:09:31 +00:00
kern_priv.c Remove the suser(9) interface from the kernel. It has been replaced from 2008-09-17 15:49:44 +00:00
kern_proc.c Do drop vm map lock earlier in the sysctl_kern_proc_vmmap(), to avoid 2008-12-08 12:29:30 +00:00
kern_prot.c The userland_sysctl() function retries sysctl_root() until returned 2008-12-12 12:06:28 +00:00
kern_resource.c Don't rearm callout if the process is exiting, it may leak a callout 2008-10-24 01:09:24 +00:00
kern_rmlock.c Teach WITNESS about the interlocks used with lockmgr. This removes a bunch 2008-09-10 19:13:30 +00:00
kern_rwlock.c add RW_SYSINIT_FLAGS macro and rw_sysinit_flags initialization function 2008-12-08 21:46:55 +00:00
kern_sdt.c Add kernel support for the Statically Defined Trace provider. 2008-05-18 19:32:36 +00:00
kern_sema.c
kern_shutdown.c It's possible that the dump device has gone away after it was 2008-11-23 21:05:22 +00:00
kern_sig.c Revert rev 184216 and 184199, due to the way the thread_lock works, 2008-11-05 03:01:23 +00:00
kern_subr.c Make ureadc() warn when holding any locks, just like uiomove(). 2008-08-28 19:34:58 +00:00
kern_switch.c fix typo in runz_fuzz 2008-05-12 06:42:06 +00:00
kern_sx.c Teach WITNESS about the interlocks used with lockmgr. This removes a bunch 2008-09-10 19:13:30 +00:00
kern_synch.c - Forward port flush of page table updates on context switch or userret 2008-10-19 01:35:27 +00:00
kern_syscalls.c Various style fixes. 7 space indent is just odd. 2008-09-18 20:10:11 +00:00
kern_sysctl.c The userland_sysctl() function retries sysctl_root() until returned 2008-12-12 12:06:28 +00:00
kern_tc.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
kern_thr.c Add sv_flags field to struct sysentvec with intention to provide description 2008-11-22 12:36:15 +00:00
kern_thread.c Update ZFS from version 6 to 13 and bring some FreeBSD-specific changes. 2008-11-17 20:49:29 +00:00
kern_time.c In realtimer_delete(), clear timer's value and interval to tell 2008-10-20 02:37:53 +00:00
kern_timeout.c After a machine has been up for a bit more than 20 days with HZ=1000, 2008-10-28 03:26:25 +00:00
kern_umtx.c Add two commands to _umtx_op system call to allow a simple mutex to be 2008-06-24 07:32:12 +00:00
kern_uuid.c Rather than using hidden includes (with cicular dependencies), 2008-12-02 21:37:28 +00:00
kern_vimage.c Conditionally compile out V_ globals while instantiating the appropriate 2008-12-10 23:12:39 +00:00
kern_xxx.c Mark uname(), getdomainname() and setdomainname() with COMPAT_FREEBSD4. 2008-11-09 10:45:13 +00:00
ksched.c Commit 14/14 of sched_lock decomposition. 2007-06-05 00:00:57 +00:00
link_elf_obj.c Calling linker_load_dependencies() while holding the module' 2008-08-03 13:33:45 +00:00
link_elf.c Calling linker_load_dependencies() while holding the module' 2008-08-03 13:33:45 +00:00
linker_if.m Add the ctf_get method. 2008-05-23 04:06:49 +00:00
Make.tags.inc Catch up with the disappearance of sys/dev/hfa. 2008-12-01 14:34:42 +00:00
Makefile style.Makefile(5) 2007-12-14 21:30:51 +00:00
makesyscalls.sh Tidy up a few things with syscall generation: 2008-09-25 20:07:42 +00:00
md4c.c
md5c.c
p1003_1b.c Remove kernel support for M:N threading. 2008-03-12 10:12:01 +00:00
posix4_mib.c
sched_4bsd.c When choosing a CPU for a thread in a cpuset, prefer the last CPU that the 2008-07-28 20:39:21 +00:00
sched_ule.c When checking to see if another CPU is running its idle thread, examine 2008-11-18 05:41:34 +00:00
serdev_if.m
stack_protector.c Fix a chicken-and-egg problem: this files implements SSP support, 2008-06-26 07:52:45 +00:00
subr_acl_posix1e.c Rename a variable missed in previous accmode_t-related commits. 2008-10-28 21:58:48 +00:00
subr_autoconf.c If run_interrupt_driven_config_hooks() waits 360 seconds and INVARIANTS 2008-07-21 20:50:49 +00:00
subr_blist.c Retire the MALLOC and FREE macros. They are an abomination unto style(9). 2008-10-23 15:53:51 +00:00
subr_bufring.c - bump __FreeBSD version to reflect added buf_ring, memory barriers, 2008-11-22 05:55:56 +00:00
subr_bus.c Allow device hints to wire the unit numbers of devices. 2008-11-18 21:01:54 +00:00
subr_clist.c Now that the number of clist consumers have dropped massively, trim down 2008-09-21 18:12:18 +00:00
subr_clock.c Now that all platforms use genclock, shuffle things around slightly 2008-04-22 19:38:30 +00:00
subr_devstat.c
subr_disk.c
subr_eventhandler.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
subr_fattime.c
subr_firmware.c Avoid scheduling firmware taskqs when cold. 2008-11-11 12:25:08 +00:00
subr_hints.c
subr_kdb.c Expand kdb_alt_break a little, most commonly used with the option 2008-05-04 23:29:38 +00:00
subr_kobj.c
subr_lock.c - track maximum wait time 2008-07-27 21:45:20 +00:00
subr_log.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
subr_mbpool.c Add parens around *free in *free++ in mbp_count() so that mbp_count() 2007-05-27 17:38:36 +00:00
subr_mchain.c Replaced the misleading uses of a historical artefact M_TRYWAIT with M_WAIT. 2008-03-25 09:39:02 +00:00
subr_module.c
subr_msgbuf.c
subr_param.c - Detect Bochs BIOS variants and use HZ_VM as well. 2008-12-08 18:39:59 +00:00
subr_pcpu.c Make ddb command registration dynamic so modules can extend 2008-09-15 22:45:14 +00:00
subr_power.c
subr_prf.c Remove added newlines from logged messages written to /dev/console. 2008-12-10 21:48:05 +00:00
subr_prof.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
subr_rman.c Trivially avoid a null pointer dereference when drivers 2008-10-22 18:20:45 +00:00
subr_rtc.c Now that all platforms use genclock, shuffle things around slightly 2008-04-22 19:38:30 +00:00
subr_sbuf.c Switch to simplified BSD license (with phk's approval), plus whitespace 2008-08-09 10:26:21 +00:00
subr_scanf.c
subr_sleepqueue.c Revision 184199 had not been fully reverted, add missing piece. 2008-12-01 01:54:55 +00:00
subr_smp.c Adjust the license statement to more closely match a standard 3-clause BSD 2008-11-03 21:17:02 +00:00
subr_stack.c Make it possible to compile kernel with KTR but without DDB. 2008-10-30 21:48:28 +00:00
subr_taskqueue.c revert local change 2008-07-18 07:10:33 +00:00
subr_trap.c - Forward port flush of page table updates on context switch or userret 2008-10-19 01:35:27 +00:00
subr_turnstile.c Make ddb command registration dynamic so modules can extend 2008-09-15 22:45:14 +00:00
subr_unit.c Since cdev mutex is after system map mutex in global lock order, free() 2007-07-04 06:56:58 +00:00
subr_witness.c - convert radix node head lock from mutex to rwlock 2008-12-07 21:15:43 +00:00
sys_generic.c Reverse if() logic to improve readability. 2008-09-23 14:25:38 +00:00
sys_pipe.c Several cleanups related to pipe(2). 2008-11-11 14:55:59 +00:00
sys_process.c Revert rev 184216 and 184199, due to the way the thread_lock works, 2008-11-05 03:01:23 +00:00
sys_socket.c Lock receive socket buffer in soo_stat() rather than commenting that we 2008-10-07 07:10:28 +00:00
syscalls.c Regenerate system call tables for r184789. 2008-11-09 10:48:06 +00:00
syscalls.master Mark uname(), getdomainname() and setdomainname() with COMPAT_FREEBSD4. 2008-11-09 10:45:13 +00:00
systrace_args.c Regenerate system call tables for r184789. 2008-11-09 10:48:06 +00:00
sysv_ipc.c Eliminate now-unused SUSER_ALLOWJAIL arguments to priv_check_cred(); in 2007-06-12 00:12:01 +00:00
sysv_msg.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
sysv_sem.c Renew semaphore's pointer after wakeup since during msleep 2008-06-19 18:08:42 +00:00
sysv_shm.c Make sure we restrict Linux only IPC calls from being executed 2008-02-12 20:55:03 +00:00
tty_compat.c Fix an awful bug inside our COMPAT_43TTY code. 2008-09-04 16:30:53 +00:00
tty_info.c Integrate the new MPSAFE TTY layer to the FreeBSD operating system. 2008-08-20 08:31:58 +00:00
tty_inq.c Fix some edge cases in the TTY queues: 2008-08-30 09:18:27 +00:00
tty_outq.c Fix some edge cases in the TTY queues: 2008-08-30 09:18:27 +00:00
tty_pts.c Add kqueue()-support to pseudo-terminal master devices. 2008-12-11 21:44:02 +00:00
tty_pty.c Allow the user to suppress the rate-limited pty(4) warning. 2008-08-23 16:03:00 +00:00
tty_tty.c Remove unneeded Giant locking of /dev/tty. 2008-06-03 12:38:00 +00:00
tty_ttydisc.c Don't forget to relock the TTY after uiomove() returns an error. 2008-11-12 09:04:44 +00:00
tty.c Reduce the default baud rate of PTY's to 9600. 2008-11-08 20:40:39 +00:00
uipc_accf.c Retire the MALLOC and FREE macros. They are an abomination unto style(9). 2008-10-23 15:53:51 +00:00
uipc_cow.c Give MEXTADD() another argument to make both void pointers to the 2008-02-01 19:36:27 +00:00
uipc_debug.c Change a variable name to not shadow a global 2008-07-03 08:35:59 +00:00
uipc_domain.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
uipc_mbuf2.c Merge first in a series of TrustedBSD MAC Framework KPI changes 2007-10-24 19:04:04 +00:00
uipc_mbuf.c Remove the alignment of the align parameter. This is up to the caller to pass 2008-09-05 04:05:31 +00:00
uipc_mqueue.c Fix matching of message queues by name. 2008-11-28 14:53:18 +00:00
uipc_sem.c Rework the lifetime management of the kernel implementation of POSIX 2008-06-27 05:39:04 +00:00
uipc_shm.c Shared memory objects that have size which is not necessarily equal to 2008-12-01 22:33:50 +00:00
uipc_sockbuf.c Rewrite sbreserve_locked()'s comment on NULL thread pointers, eliminating 2008-10-07 09:51:39 +00:00
uipc_socket.c Make sure nmbclusters are initialized before maxsockets 2008-12-10 22:17:09 +00:00
uipc_syscalls.c Retire the MALLOC and FREE macros. They are an abomination unto style(9). 2008-10-23 15:53:51 +00:00
uipc_usrreq.c Retire the MALLOC and FREE macros. They are an abomination unto style(9). 2008-10-23 15:53:51 +00:00
vfs_acl.c Add the support for the AT_FDCWD and fd-relative name lookups to the 2008-03-31 12:01:21 +00:00
vfs_aio.c - Add 32-bit compat system calls for VFS_AIO. The system calls live in the 2008-12-10 20:56:19 +00:00
vfs_bio.c Remove the struct thread unuseful argument from bufobj interface. 2008-10-10 21:23:50 +00:00
vfs_cache.c Add a new VOP, VOP_VPTOCNP, which translates a vnode to its component name 2008-12-12 00:57:38 +00:00
vfs_cluster.c - Complete part of the unfinished bufobj work by consistently using 2008-03-22 09:15:16 +00:00
vfs_default.c Add a new VOP, VOP_VPTOCNP, which translates a vnode to its component name 2008-12-12 00:57:38 +00:00
vfs_export.c - convert radix node head lock from mutex to rwlock 2008-12-07 21:15:43 +00:00
vfs_extattr.c Add the support for the AT_FDCWD and fd-relative name lookups to the 2008-03-31 12:01:21 +00:00
vfs_hash.c In keeping with style(9)'s recommendations on macros, use a ';' 2008-03-16 10:58:09 +00:00
vfs_init.c
vfs_lookup.c Update ZFS from version 6 to 13 and bring some FreeBSD-specific changes. 2008-11-17 20:49:29 +00:00
vfs_mount.c Fix an inverted check introduced in r184554. 2008-12-01 03:00:26 +00:00
vfs_subr.c In the nfsrv_fhtovp(), after the vfs_getvfs() function found the pointer 2008-11-29 13:34:59 +00:00
vfs_syscalls.c In the nfsrv_fhtovp(), after the vfs_getvfs() function found the pointer 2008-11-29 13:34:59 +00:00
vfs_vnops.c Improve KASSERT() call a bit: 2008-11-29 12:40:14 +00:00
vnode_if.src Add a new VOP, VOP_VPTOCNP, which translates a vnode to its component name 2008-12-12 00:57:38 +00:00