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freebsd-skq/sys/kern
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Alexander Kabaev c8b876219f Upgrading a lock does not play well together with acquiring an exclusive lock 
and can lead to two threads being granted exclusive access. Check that no one
has the same lock in exclusive  mode before proceeding to acquire it.

The LK_WANT_EXCL and LK_WANT_UPGRADE bits act as mini-locks and can block
other threads.  Normally this is not a problem since the mini locks are
upgraded to full locks and the release of the locks will unblock the other
threads.  However if a thread reset the bits without obtaining a full lock
other threads are not awoken. Add missing wakeups for these cases.

PR:		kern/69964
Submitted by:	Stephan Uphoff <ups at tree dot com>
Very good catch by: Stephan Uphoff <ups at tree dot com>
2004-08-16 15:01:22 +00:00
..
bus_if.m Minor formatting fixes for lines > 80 characters 2004-08-12 17:26:22 +00:00
clock_if.m
device_if.m Minor formatting fixes for lines > 80 characters 2004-08-12 17:26:22 +00:00
genassym.sh
imgact_aout.c Change the types of vn_rdwr_inchunks()'s len and aresid arguments to 2004-06-05 02:18:28 +00:00
imgact_elf32.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
imgact_elf64.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
imgact_elf.c Add __elfN(dump_thread). This function is called from __elfN(coredump) 2004-08-11 02:35:06 +00:00
imgact_gzip.c Locking for the per-process resource limits structure. 2004-02-04 21:52:57 +00:00
imgact_shell.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
inflate.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
init_main.c Add locking to the kqueue subsystem. This also makes the kqueue subsystem 2004-08-15 06:24:42 +00:00
init_sysent.c Give kldunload a -f(orce) argument. 2004-07-13 19:36:59 +00:00
kern_acct.c Second half of the dev_t cleanup. 2004-06-17 17:16:53 +00:00
kern_acl.c Rename suser_cred()'s PRISON_ROOT flag to SUSER_ALLOWJAIL. This is 2004-07-26 07:24:04 +00:00
kern_alq.c Allow MAC policies to block/revoke kern_alq write access to a file. 2003-10-25 16:10:41 +00:00
kern_clock.c Update for the KDB framework: 2004-07-10 21:36:01 +00:00
kern_condvar.c Synchronize the extra SA threading checks and return value handling of 2004-08-10 17:42:59 +00:00
kern_conf.c Add locking to the kqueue subsystem. This also makes the kqueue subsystem 2004-08-15 06:24:42 +00:00
kern_context.c Change the clear_ret argument of get_mcontext() to be a flags argument. 2003-11-09 20:31:04 +00:00
kern_descrip.c Add the missing knote_fdclose(). 2004-08-16 03:09:01 +00:00
kern_environment.c If the buffer supplied to kenv(KENV_DUMP, ...) isn't big enough, 2004-04-28 01:27:33 +00:00
kern_event.c Allocate the marker, when scanning a kqueue, from the "heap" instead of the 2004-08-16 03:08:38 +00:00
kern_exec.c Add locking to the kqueue subsystem. This also makes the kqueue subsystem 2004-08-15 06:24:42 +00:00
kern_exit.c Add locking to the kqueue subsystem. This also makes the kqueue subsystem 2004-08-15 06:24:42 +00:00
kern_fork.c Add locking to the kqueue subsystem. This also makes the kqueue subsystem 2004-08-15 06:24:42 +00:00
kern_idle.c Expand the generic, but bogusly formed, copyright notice to include 2004-07-25 19:49:01 +00:00
kern_intr.c In ithread_schedule(), when we plan to go harvest some entropy as 2004-08-06 03:39:28 +00:00
kern_jail.c Add two missing includes and remove two uneeded. 2004-06-27 09:03:22 +00:00
kern_kse.c Slight changes to comments and some whitespace changes. 2004-08-09 21:57:30 +00:00
kern_kthread.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
kern_ktr.c Export KTR_COMPILE as a sysctl so you can easily check from user space 2004-07-23 17:41:44 +00:00
kern_ktrace.c Rename suser_cred()'s PRISON_ROOT flag to SUSER_ALLOWJAIL. This is 2004-07-26 07:24:04 +00:00
kern_linker.c Give kldunload a -f(orce) argument. 2004-07-13 19:36:59 +00:00
kern_lock.c Upgrading a lock does not play well together with acquiring an exclusive lock 2004-08-16 15:01:22 +00:00
kern_lockf.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
kern_mac.c Do a pass over all modules in the kernel and make them return EOPNOTSUPP 2004-07-15 08:26:07 +00:00
kern_malloc.c Reimplement contigmalloc(9) with an algorithm which stands a greatly- 2004-07-19 06:21:27 +00:00
kern_mbuf.c * Add a "how" argument to uma_zone constructors and initialization functions 2004-08-02 00:18:36 +00:00
kern_mib.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
kern_module.c Do a pass over all modules in the kernel and make them return EOPNOTSUPP 2004-07-15 08:26:07 +00:00
kern_mtxpool.c Rearrange the SYSINIT order to call lockmgr_init() earlier so that 2003-07-16 01:00:39 +00:00
kern_mutex.c Cache the value of curthread in the _get_sleep_lock() and _get_spin_lock() 2004-08-04 20:18:45 +00:00
kern_ntptime.c Annual NTP kernel code spring-cleaning: 2004-03-14 15:23:05 +00:00
kern_physio.c Eliminate the acquisition and release of Giant within physio(). Remove 2004-08-10 21:47:11 +00:00
kern_poll.c Add a NULL param to an mi_switch() that I missed. 2004-07-03 02:38:03 +00:00
kern_proc.c Cause pfind() not to return processes in the PRS_NEW state. As a result, 2004-08-14 17:15:16 +00:00
kern_prot.c Rename suser_cred()'s PRISON_ROOT flag to SUSER_ALLOWJAIL. This is 2004-07-26 07:24:04 +00:00
kern_resource.c Push UIDINFO_UNLOCK() slightly earlier in chgsbize(), as it's not 2004-08-06 22:04:33 +00:00
kern_sema.c Change the return value of sema_timedwait() so it returns 0 on 2004-06-14 18:19:05 +00:00
kern_shutdown.c Yet another tweak to the shutdown messages in boot(): 2004-08-15 19:17:23 +00:00
kern_sig.c Add locking to the kqueue subsystem. This also makes the kqueue subsystem 2004-08-15 06:24:42 +00:00
kern_subr.c Clean up and wash struct iovec and struct uio handling. 2004-07-10 15:42:16 +00:00
kern_switch.c Add a temporary debugging hack to detect a deadlock in setrunqueue(). This 2004-08-10 00:26:25 +00:00
kern_sx.c Fix _sx_assert() to panic() rather than printf() when an assertion fails 2004-02-27 16:13:44 +00:00
kern_synch.c Increase the amount of data exported by KTR in the KTR_RUNQ setting. 2004-08-09 18:21:12 +00:00
kern_syscalls.c Do a pass over all modules in the kernel and make them return EOPNOTSUPP 2004-07-15 08:26:07 +00:00
kern_sysctl.c Avoid casts as lvalues. 2004-07-28 06:42:41 +00:00
kern_tc.c Add some KASSERTS. 2004-08-14 08:33:49 +00:00
kern_thr.c When calling scheduler entrypoints for creating new threads and processes, 2004-07-18 23:36:13 +00:00
kern_thread.c Whitespace nit. 2004-08-14 07:21:20 +00:00
kern_time.c Update previous commit to: 2004-06-21 22:34:57 +00:00
kern_timeout.c Cut a KTR record whenever a callout is invoked. Mark whether it runs 2004-08-06 21:49:00 +00:00
kern_umtx.c writers must hold both sched_lock and the process lock; therefore, readers 2004-07-12 15:28:31 +00:00
kern_uuid.c Fix generation of random multicast MAC address. 2004-01-22 13:34:11 +00:00
kern_xxx.c Rename suser_cred()'s PRISON_ROOT flag to SUSER_ALLOWJAIL. This is 2004-07-26 07:24:04 +00:00
ksched.c sched_setscheduler: Return EINVAL when a invalid policy is specified, 2003-09-13 18:46:24 +00:00
link_elf_obj.c Give kldunload a -f(orce) argument. 2004-07-13 19:36:59 +00:00
link_elf.c Normalize the VM wiring done with SPARSE_MAPPING: check for errors, and 2004-08-09 18:46:13 +00:00
linker_if.m The method link_preload_finish is not static. 2003-09-20 17:39:32 +00:00
Make.tags.inc
Makefile
makesyscalls.sh Remove the namespace column from the syscalls tables. We don't actually 2003-12-23 03:50:43 +00:00
md4c.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
md5c.c Revert stuff which accidentally ended up in the previous commit. 2003-07-22 10:36:36 +00:00
p1003_1b.c Use __FBSDID(). 2003-06-11 06:34:30 +00:00
posix4_mib.c Use __FBSDID(). 2003-06-11 06:34:30 +00:00
sched_4bsd.c Properly keep track of how many kses are on the system run queue(s). 2004-08-11 20:54:48 +00:00
sched_ule.c - Introduce a new flag KEF_HOLD that prevents sched_add() from doing a 2004-08-12 07:56:33 +00:00
subr_acl_posix1e.c Rename suser_cred()'s PRISON_ROOT flag to SUSER_ALLOWJAIL. This is 2004-07-26 07:24:04 +00:00
subr_autoconf.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
subr_blist.c Move the definitions of SWAPBLK_NONE and SWAPBLK_MASK from vm_page.h to 2004-06-04 04:03:26 +00:00
subr_bus.c Add doxygen doc comments for most of newbus and the BUS interface. 2004-07-18 16:30:31 +00:00
subr_clist.c Preparation commit for the tty cleanups that will follow in the near 2004-07-15 20:47:41 +00:00
subr_clock.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
subr_devstat.c Do the dreaded s/dev_t/struct cdev */ 2004-06-16 09:47:26 +00:00
subr_disk.c Report bio_pblkbo instead of bio_blkno. 2003-10-18 17:27:10 +00:00
subr_eventhandler.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_hints.c Add a resource_disabled() helper function that returns true (non-zero) if 2003-07-02 16:01:38 +00:00
subr_kdb.c Add a new sysctl, debug.kdb.stop_cpus, which controls whether or not we 2004-08-15 02:06:27 +00:00
subr_kobj.c * Add multiple inheritance to kobj. Each class can have zero or more base 2003-10-16 09:16:28 +00:00
subr_log.c Do the dreaded s/dev_t/struct cdev */ 2004-06-16 09:47:26 +00:00
subr_mbpool.c Pass MTX_DEF as the last argument to mtx_init() instead of 0. This 2003-12-07 21:53:41 +00:00
subr_mchain.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
subr_module.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_msgbuf.c Put the message about msgbuf cksum mismatch under bootverbose and tell 2003-09-05 11:12:00 +00:00
subr_param.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
subr_pcpu.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
subr_power.c Move the kernel power change printf under bootverbose since the 2004-01-02 18:24:13 +00:00
subr_prf.c Update for the KDB framework: 2004-07-10 21:43:23 +00:00
subr_prof.c - Move TDF_OWEPREEMPT, TDF_OWEUPC, and TDF_USTATCLOCK over to td_pflags 2004-07-16 21:04:55 +00:00
subr_rman.c Fix the code in rman that merges adjacent unallocated resources to use a 2004-08-05 15:48:18 +00:00
subr_rtc.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
subr_sbuf.c Cosmetic adjustment to previous commit: name the second argument to 2004-07-09 11:37:44 +00:00
subr_scanf.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
subr_sleepqueue.c - Change mi_switch() and sched_switch() to accept an optional thread to 2004-07-02 19:09:50 +00:00
subr_smp.c Don't keep evaluating our own cpu mask.. 2004-08-13 00:57:43 +00:00
subr_taskqueue.c rearange some code that handles the thread taskqueue so that it is more 2004-08-08 02:37:22 +00:00
subr_trap.c Call thread_user_enter for M:N thread, ast() should be treated as another 2004-08-08 22:28:33 +00:00
subr_turnstile.c Revert modification of subr_turnstile.c accidentally included in the 2004-07-25 23:32:32 +00:00
subr_witness.c Remove a potential deadlock on i386 SMP by changing the lazypmap ipi and 2004-08-04 20:31:19 +00:00
sys_generic.c Clean up and wash struct iovec and struct uio handling. 2004-07-10 15:42:16 +00:00
sys_pipe.c Major enhancements to pipe memory usage: 2004-08-16 01:27:24 +00:00
sys_process.c Add pl_flags to ptrace_lwpinfo, two flags PL_FLAG_SA and PL_FLAG_BOUND 2004-08-08 22:26:11 +00:00
sys_socket.c Push Giant acquisition down into fo_stat() from most callers. Acquire 2004-07-22 20:40:23 +00:00
syscalls.c Give kldunload a -f(orce) argument. 2004-07-13 19:36:59 +00:00
syscalls.master Add kldunloadf() system call. Stay tuned for follwing commit messages. 2004-07-13 19:35:11 +00:00
sysv_ipc.c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
sysv_msg.c Add missing #include <sys/module.h> 2004-05-30 20:34:58 +00:00
sysv_sem.c Add missing #include <sys/module.h> 2004-05-30 20:34:58 +00:00
sysv_shm.c Avoid casts as lvalues. 2004-07-28 06:42:41 +00:00
tty_compat.c Put the pre FreeBSD-2.x tty compat code under BURN_BRIDGES. 2004-06-21 22:57:16 +00:00
tty_conf.c Preparation commit for the tty cleanups that will follow in the near 2004-07-15 20:47:41 +00:00
tty_cons.c Add locking to the kqueue subsystem. This also makes the kqueue subsystem 2004-08-15 06:24:42 +00:00
tty_pty.c Preparation commit for the tty cleanups that will follow in the near 2004-07-15 20:47:41 +00:00
tty_subr.c Preparation commit for the tty cleanups that will follow in the near 2004-07-15 20:47:41 +00:00
tty_tty.c Second half of the dev_t cleanup. 2004-06-17 17:16:53 +00:00
tty.c Add locking to the kqueue subsystem. This also makes the kqueue subsystem 2004-08-15 06:24:42 +00:00
uipc_accf.c Add a global mutex, accept_filter_mtx, to protect the global list of 2004-06-01 04:08:48 +00:00
uipc_cow.c In some cases, sf_buf_alloc() should sleep with pri PCATCH; in others, it 2004-04-03 09:16:27 +00:00
uipc_domain.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
uipc_jumbo.c Use kmem_alloc_nofault() rather than kmem_alloc_pageable() for allocating 2004-07-23 19:36:18 +00:00
uipc_mbuf2.c Make sure we don't call mbuf allocation functions with mutexes held. 2004-07-21 07:12:24 +00:00
uipc_mbuf.c Back out just a portion of Alfred's last commit. Remove the MBUF_CHECK 2004-07-21 21:03:01 +00:00
uipc_proto.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
uipc_sem.c Add missing #include <sys/module.h> 2004-05-30 20:34:58 +00:00
uipc_sockbuf.c Add locking to the kqueue subsystem. This also makes the kqueue subsystem 2004-08-15 06:24:42 +00:00
uipc_socket2.c Add locking to the kqueue subsystem. This also makes the kqueue subsystem 2004-08-15 06:24:42 +00:00
uipc_socket.c Add locking to the kqueue subsystem. This also makes the kqueue subsystem 2004-08-15 06:24:42 +00:00
uipc_syscalls.c Add locking to the kqueue subsystem. This also makes the kqueue subsystem 2004-08-15 06:24:42 +00:00
uipc_usrreq.c Always acquire the UNIX domain socket subsystem lock (UNP lock) 2004-08-16 04:41:03 +00:00
vfs_acl.c Rename suser_cred()'s PRISON_ROOT flag to SUSER_ALLOWJAIL. This is 2004-07-26 07:24:04 +00:00
vfs_aio.c Add locking to the kqueue subsystem. This also makes the kqueue subsystem 2004-08-15 06:24:42 +00:00
vfs_bio.c Eliminate unused second argument to reassignbuf() and simplify it 2004-07-25 21:24:23 +00:00
vfs_cache.c Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00
vfs_cluster.c Eliminate unused second argument to reassignbuf() and simplify it 2004-07-25 21:24:23 +00:00
vfs_default.c Make VFS_ROOT() and vflush() take a thread argument. 2004-07-12 08:14:09 +00:00
vfs_export.c Make VFS_ROOT() and vflush() take a thread argument. 2004-07-12 08:14:09 +00:00
vfs_extattr.c Rename suser_cred()'s PRISON_ROOT flag to SUSER_ALLOWJAIL. This is 2004-07-26 07:24:04 +00:00
vfs_init.c Put a version element in the VFS filesystem configuration structure 2004-07-30 22:08:52 +00:00
vfs_lookup.c Assert Giant in namei(). Bugs have been reported in which, following 2004-08-04 18:39:07 +00:00
vfs_mount.c Put a version element in the VFS filesystem configuration structure 2004-07-30 22:08:52 +00:00
vfs_subr.c s/MAX_SAFE_MAXVNODES/MAXVNODES_MAX/g 2004-08-16 08:33:37 +00:00
vfs_syscalls.c Rename suser_cred()'s PRISON_ROOT flag to SUSER_ALLOWJAIL. This is 2004-07-26 07:24:04 +00:00
vfs_vnops.c Add locking to the kqueue subsystem. This also makes the kqueue subsystem 2004-08-15 06:24:42 +00:00
vnode_if.src Remove advertising clause from University of California Regent's license, 2004-04-05 21:03:37 +00:00