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05a4755ef6
freebsd-skq/sys/kern
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Ryan Stone 05a4755ef6 Fix a LOR between hwpmc and the kernel linker. When a system-wide 
sampling mode PMC is allocated, hwpmc calls linker_hwpmc_list_objects()
while already holding an exclusive lock on pmc-sx lock.  list_objects()
tries to acquire an exclusive lock on the kld_sx lock.  When a KLD module
is loaded or unloaded successfully, kern_kld(un)load calls into the pmc
hook while already holding an exclusive lock on the kld_sx lock.  Calling
the pmc hook requires acquiring a shared lock on the pmc-sx lock.

Fix this by only acquiring a shared lock on the kld_sx lock in
linker_hwpmc_list_objects(), and also downgrading to a shared lock on the
kld_sx lock in kern_kld(un)load before calling into the pmc hook.  In
kern_kldload this required moving some modifications of the linker_file_t
to happen before calling into the pmc hook.

This fixes the deadlock by ensuring that the hwpmc -> list_objects() case
is always able to proceed.  Without this patch, I was able to deadlock a
multicore system within minutes by constantly loading and unloading an KLD
module while I simultaneously started a sampling mode PMC in a loop.

MFC after:	1 month
2011-07-17 21:53:42 +00:00
..
bus_if.m Add a new bus method, BUS_ADJUST_RESOURCE() that is intended to be a 2011-04-29 21:36:45 +00:00
capabilities.conf Continue to introduce Capsicum Capability Mode support: 2011-03-01 13:28:27 +00:00
clock_if.m
cpufreq_if.m
device_if.m Update comments for DEVICE_PROBE() to reflect that BUS_PROBE_DEFAULT is 2011-05-24 13:22:40 +00:00
genassym.sh
imgact_aout.c Do not trash the argv[0] pointer for an a.out process on amd64. 2011-06-16 22:00:59 +00:00
imgact_elf32.c
imgact_elf64.c
imgact_elf.c All the racct_*() calls need to happen with the proc locked. Fixing this 2011-07-06 20:06:44 +00:00
imgact_gzip.c Add accounting for most of the memory-related resources. 2011-04-05 20:23:59 +00:00
imgact_shell.c The execution of the shebang script requires putting interpreter path, 2011-03-06 22:59:30 +00:00
inflate.c
init_main.c Enable accounting for RACCT_NPROC and RACCT_NTHR. 2011-03-31 19:22:11 +00:00
init_sysent.c Auto-generated system call code with cap_new(), cap_getrights(). 2011-07-15 18:33:12 +00:00
kern_acct.c Use ISO C99 integer types in sys/kern where possible. 2010-06-21 09:55:56 +00:00
kern_alq.c - Rework the underlying ALQ storage to be a circular buffer, which amongst other 2010-04-26 13:48:22 +00:00
kern_clock.c Fix several places to ignore processes that are not yet fully constructed. 2011-04-06 17:47:22 +00:00
kern_clocksource.c Set negative quality to TSC timecounter when C3 state is enabled for Intel 2011-06-22 16:40:45 +00:00
kern_condvar.c
kern_conf.c MFC 2011-06-15 07:20:22 +00:00
kern_cons.c Add descriptions to a handful of sysctl nodes. 2010-08-09 14:48:31 +00:00
kern_context.c Clear the padding when returning context to the usermode, for 2011-02-05 15:10:27 +00:00
kern_cpu.c cpufreq: allocate long-lived buffer for handling of sysctl requests 2010-07-23 16:46:42 +00:00
kern_cpuset.c Fix KTR_CPUMASK in order to accept a string representing a cpuset_t. 2011-05-31 20:48:58 +00:00
kern_ctf.c
kern_descrip.c Add implementation for capabilities. 2011-07-15 09:37:14 +00:00
kern_dtrace.c Add some FEATURE macros for various features (AUDIT/CAM/IPC/KTR/MAC/NFS/NTP/ 2011-02-25 10:11:01 +00:00
kern_environment.c In init_dynamic_kenv(), ignore environment strings exceeding the 2011-05-23 16:40:44 +00:00
kern_et.c sysctl(9) cleanup checkpoint: amd64 GENERIC builds cleanly. 2011-01-12 19:54:19 +00:00
kern_event.c After the r219999 is merged to stable/8, rename fallocf(9) to falloc(9) 2011-04-01 13:28:34 +00:00
kern_exec.c Add some checks to ensure that Capsicum is behaving correctly, and add some 2011-06-30 10:56:02 +00:00
kern_exit.c All the racct_*() calls need to happen with the proc locked. Fixing this 2011-07-06 20:06:44 +00:00
kern_fail.c Add an option to have a fail point term only execute when run by a 2011-07-08 20:41:12 +00:00
kern_fork.c Implement an RFTSIGZMB flag to rfork(2) to specify a signal that is 2011-07-12 20:37:18 +00:00
kern_gzio.c Do not set IO_NODELOCKED while writing to vnodes as our consumers 2010-04-30 03:10:53 +00:00
kern_hhook.c Staticize malloc types. 2011-04-13 11:28:46 +00:00
kern_idle.c On multi-core, multi-threaded PPC systems, it is important that the threads 2011-05-31 15:11:43 +00:00
kern_intr.c - Catch up to falloc() changes. 2011-04-26 07:30:52 +00:00
kern_jail.c Add infrastructure to allow all frames/packets received on an interface 2011-07-03 12:22:02 +00:00
kern_khelp.c Use the full and proper company name for Swinburne University of Technology 2011-04-12 08:13:18 +00:00
kern_kthread.c - Properly initialize the base priority (td_base_pri) of thread0 to PVM 2011-01-06 22:26:00 +00:00
kern_ktr.c Fix KTR_CPUMASK in order to accept a string representing a cpuset_t. 2011-05-31 20:48:58 +00:00
kern_ktrace.c Fix several places to ignore processes that are not yet fully constructed. 2011-04-06 17:47:22 +00:00
kern_linker.c Fix a LOR between hwpmc and the kernel linker. When a system-wide 2011-07-17 21:53:42 +00:00
kern_lock.c Add some FEATURE macros for various features (AUDIT/CAM/IPC/KTR/MAC/NFS/NTP/ 2011-02-25 10:11:01 +00:00
kern_lockf.c
kern_lockstat.c
kern_loginclass.c Add racct. It's an API to keep per-process, per-jail, per-loginclass 2011-03-29 17:47:25 +00:00
kern_malloc.c Modestly increase the maximum allowed size of the kmem map on i386. 2011-03-23 16:38:29 +00:00
kern_mbuf.c Use ISO C99 integer types in sys/kern where possible. 2010-06-21 09:55:56 +00:00
kern_mib.c sysctl(9) cleanup checkpoint: amd64 GENERIC builds cleanly. 2011-01-12 19:54:19 +00:00
kern_module.c Style fix. 2010-11-22 15:28:54 +00:00
kern_mtxpool.c
kern_mutex.c - Remove <machine/mutex.h>. Most of the headers were empty, and the 2010-11-09 20:46:41 +00:00
kern_ntptime.c Add some FEATURE macros for various features (AUDIT/CAM/IPC/KTR/MAC/NFS/NTP/ 2011-02-25 10:11:01 +00:00
kern_osd.c
kern_physio.c Account i/o done on cdevs. 2010-11-25 20:05:11 +00:00
kern_pmc.c Commit the support for removing cpumask_t and replacing it directly with 2011-05-05 14:39:14 +00:00
kern_poll.c
kern_priv.c Add an extra comment to the SDT probes definition. This allows us to get 2010-08-22 11:18:57 +00:00
kern_proc.c - Commit work from libprocstat project. These patches add support for runtime 2011-05-12 10:11:39 +00:00
kern_prot.c Notify racct when process credentials change. 2011-03-31 18:12:04 +00:00
kern_racct.c Rename resource names to match these in login.conf. 2011-07-14 19:18:17 +00:00
kern_rctl.c Rename resource names to match these in login.conf. 2011-07-14 19:18:17 +00:00
kern_resource.c Fix several places to ignore processes that are not yet fully constructed. 2011-04-06 17:47:22 +00:00
kern_rmlock.c Remove pc_cpumask and pc_other_cpus usage from MI code. 2011-06-13 13:28:31 +00:00
kern_rwlock.c Print the pointer to the lock with the panic message. The previous 2010-03-24 19:21:26 +00:00
kern_sdt.c Use ISO C99 integer types in sys/kern where possible. 2010-06-21 09:55:56 +00:00
kern_sema.c
kern_shutdown.c In the current code, a double panic condition may lead to dumps 2011-06-08 19:28:59 +00:00
kern_sig.c Fix support for RACCT_CORE by merging forgotten file. 2011-05-26 18:54:07 +00:00
kern_switch.c Update several places that iterate over CPUs to use CPU_FOREACH(). 2010-06-11 18:46:34 +00:00
kern_sx.c - Merge changes to the base system to support OFED. These include 2011-03-21 09:40:01 +00:00
kern_synch.c Simplify a stale assertion. We have not called mi_switch() from a nested 2011-05-24 13:17:08 +00:00
kern_syscalls.c Call chainevh callback when we are invoked with neither MOD_LOAD nor 2010-10-21 20:31:50 +00:00
kern_sysctl.c Use a name instead of a magic number for kern_yield(9) when the priority 2011-05-13 05:27:58 +00:00
kern_tc.c If TSC stops ticking in C3, disable deep sleep when the user forcefully 2011-07-14 21:00:26 +00:00
kern_thr.c All the racct_*() calls need to happen with the proc locked. Fixing this 2011-07-06 20:06:44 +00:00
kern_thread.c Fix some locking nits with the p_state field of struct proc: 2011-03-24 18:40:11 +00:00
kern_time.c Create a global thread hash table to speed up thread lookup, use 2010-10-09 02:50:23 +00:00
kern_timeout.c Reintroduce the fix already discussed in r216805 (please check its history 2011-04-08 18:48:57 +00:00
kern_umtx.c Expose the umtx_key structure and API to the rest of the kernel. 2011-02-23 13:19:14 +00:00
kern_uuid.c
kern_xxx.c
ksched.c Use p4prio_to_tsprio to calculate TS priority instead of using 2011-06-07 02:50:14 +00:00
link_elf_obj.c Remove malloc(9) return value checks when M_WAITOK is used. 2011-04-16 16:20:51 +00:00
link_elf.c Even if the loaded module has no symbols, we still need to notify 2011-06-16 17:41:21 +00:00
linker_if.m
Make.tags.inc Update tags build script 2011-07-10 00:53:04 +00:00
Makefile Continue to introduce Capsicum Capability Mode support: 2011-03-01 13:28:27 +00:00
makesyscalls.sh add DTrace systrace support for linux32 and freebsd32 on amd64 syscalls 2011-03-12 08:51:43 +00:00
md4c.c
md5c.c
p1003_1b.c Set various POSIX capability sysctls to the version of the API that is 2010-11-19 17:56:16 +00:00
posix4_mib.c Set various POSIX capability sysctls to the version of the API that is 2010-11-19 17:56:16 +00:00
sched_4bsd.c Remove pc_cpumask and pc_other_cpus usage from MI code. 2011-06-13 13:28:31 +00:00
sched_ule.c Commit the support for removing cpumask_t and replacing it directly with 2011-05-05 14:39:14 +00:00
serdev_if.m
stack_protector.c
subr_acl_nfs4.c Make UFS use PSARC/2010/029 NFSv4 ACL semantics by default, bringing 2011-03-22 19:52:29 +00:00
subr_acl_posix1e.c execve(2) has a special check for file permissions: a file must have at 2010-08-30 16:30:18 +00:00
subr_autoconf.c Retire PCONFIG and leave the priority of thread0 alone when waiting for 2011-01-06 22:09:37 +00:00
subr_blist.c
subr_bufring.c Switch to our preferred 2-clause BSD license. 2010-05-05 20:39:02 +00:00
subr_bus.c Add a new bus method, BUS_ADJUST_RESOURCE() that is intended to be a 2011-04-29 21:36:45 +00:00
subr_clock.c Improve style and wording of comments and sysctl descriptions [1]. 2011-01-09 14:34:56 +00:00
subr_devstat.c Instead of using an atomic operation to determine whether the devstat(9) 2011-06-13 22:08:24 +00:00
subr_disk.c Correct bioq_disksort so that bioq_insert_tail() offers barrier semantic. 2010-09-02 19:40:28 +00:00
subr_eventhandler.c Split eventhandler_register() into an internal part and a wrapper function 2010-03-19 19:51:03 +00:00
subr_fattime.c Use ISO C99 integer types in sys/kern where possible. 2010-06-21 09:55:56 +00:00
subr_firmware.c Bump up the firmware_table from 30 to 50. bwn needs more than 30, it 2010-03-07 22:37:35 +00:00
subr_hash.c Decompose the most lousy named file in sys/kern; kern_subr.c. 2010-02-21 19:53:33 +00:00
subr_hints.c
subr_kdb.c Fix a mismerge. 2011-06-27 13:02:23 +00:00
subr_kobj.c sysctl(9) cleanup checkpoint: amd64 GENERIC builds cleanly. 2011-01-12 19:54:19 +00:00
subr_lock.c Explicitly wire the user buffer rather than doing it implicitly in 2011-01-27 00:34:12 +00:00
subr_log.c Finish r210923, 210926. Mark some devices as eternal. 2011-01-04 10:59:38 +00:00
subr_mbpool.c
subr_mchain.c Add some FEATURE macros for various features (AUDIT/CAM/IPC/KTR/MAC/NFS/NTP/ 2011-02-25 10:11:01 +00:00
subr_module.c Provide convenience function for obtaining MODINFO_ADDR and MODINFO_SIZE 2011-02-09 19:08:21 +00:00
subr_msgbuf.c Fix a bug introduced in revision 222537. 2011-05-31 22:39:32 +00:00
subr_param.c Modestly increase the maximum allowed size of the kmem map on i386. 2011-03-23 16:38:29 +00:00
subr_pcpu.c Completely remove now unused pc_other_cpus, pc_cpumask. 2011-07-04 10:45:54 +00:00
subr_power.c
subr_prf.c Set pca.p_bufr to NULL when we haven't allocated a buffer. 2011-06-07 05:04:37 +00:00
subr_prof.c Revert r210225 - turns out I was wrong; the "/*-" is not license-only 2010-07-18 20:57:53 +00:00
subr_rman.c Clear the device_t pointer in 'struct resource' when releasing a device 2011-06-06 13:12:56 +00:00
subr_rtc.c Add the half of time-of-day clock resolution when we adjust system time from 2010-08-12 17:17:05 +00:00
subr_sbuf.c Use memset() instead of bzero() and memcpy() instead of bcopy(), there 2011-05-17 11:04:50 +00:00
subr_scanf.c
subr_sglist.c
subr_sleepqueue.c Explicitly wire the user buffer rather than doing it implicitly in 2011-01-27 00:34:12 +00:00
subr_smp.c MFC 2011-06-26 17:30:46 +00:00
subr_stack.c Add some FEATURE macros for various features (AUDIT/CAM/IPC/KTR/MAC/NFS/NTP/ 2011-02-25 10:11:01 +00:00
subr_taskqueue.c Implement the delayed task execution extension to the taskqueue 2011-04-26 11:39:56 +00:00
subr_trap.c We may split today's CAPABILITIES into CAPABILITY_MODE (which has 2011-06-29 13:03:05 +00:00
subr_turnstile.c Always assert that the turnstile chain lock is held in turnstile_wait() 2011-02-04 14:16:41 +00:00
subr_uio.c Add a facility to disable processing page faults. When activated, 2011-07-09 15:21:10 +00:00
subr_unit.c Fix typos - remove duplicate "the". 2011-02-21 09:01:34 +00:00
subr_witness.c Fix typos - remove duplicate "the". 2011-02-21 09:01:34 +00:00
sys_capability.c Add cap_new() and cap_getrights() system calls. 2011-07-15 18:26:19 +00:00
sys_generic.c For some file types, select code registers two selfd structures. E.g., 2010-08-28 17:42:08 +00:00
sys_pipe.c After the r219999 is merged to stable/8, rename fallocf(9) to falloc(9) 2011-04-01 13:28:34 +00:00
sys_process.c Add comment from CSRG rev 7.27 (1992/06/23 19:56:55; author: mckusick) 2011-06-17 21:44:13 +00:00
sys_socket.c Mfp4 CH=177274,177280,177284-177285,177297,177324-177325 2011-02-16 21:29:13 +00:00
syscalls.c Auto-generated system call code with cap_new(), cap_getrights(). 2011-07-15 18:33:12 +00:00
syscalls.master Add cap_new() and cap_getrights() system calls. 2011-07-15 18:26:19 +00:00
systrace_args.c Auto-generated system call code with cap_new(), cap_getrights(). 2011-07-15 18:33:12 +00:00
sysv_ipc.c Move SysV IPC freebsd32 compat shims helpers from freebsd32_misc.c to 2010-03-19 11:01:51 +00:00
sysv_msg.c All the racct_*() calls need to happen with the proc locked. Fixing this 2011-07-06 20:06:44 +00:00
sysv_sem.c Remove semaphore map entry count "semmap" field and its tuning 2011-07-14 14:18:14 +00:00
sysv_shm.c All the racct_*() calls need to happen with the proc locked. Fixing this 2011-07-06 20:06:44 +00:00
tty_compat.c
tty_info.c
tty_inq.c Fix whitespace inconsistencies in the TTY layer and its drivers owned by me. 2011-06-26 18:26:20 +00:00
tty_outq.c Fix whitespace inconsistencies in the TTY layer and its drivers owned by me. 2011-06-26 18:26:20 +00:00
tty_pts.c Fix whitespace inconsistencies in the TTY layer and its drivers owned by me. 2011-06-26 18:26:20 +00:00
tty_tty.c Finish r210923, 210926. Mark some devices as eternal. 2011-01-04 10:59:38 +00:00
tty_ttydisc.c Fix whitespace inconsistencies in the TTY layer and its drivers owned by me. 2011-06-26 18:26:20 +00:00
tty.c Reintroduce the cioctl() hook in the TTY layer for digi(4). 2011-07-02 13:54:20 +00:00
uipc_accf.c
uipc_cow.c Add some FEATURE macros for various features (AUDIT/CAM/IPC/KTR/MAC/NFS/NTP/ 2011-02-25 10:11:01 +00:00
uipc_debug.c
uipc_domain.c
uipc_mbuf2.c Use ISO C99 integer types in sys/kern where possible. 2010-06-21 09:55:56 +00:00
uipc_mbuf.c Fix typos - remove duplicate "the". 2011-02-21 09:01:34 +00:00
uipc_mqueue.c After the r219999 is merged to stable/8, rename fallocf(9) to falloc(9) 2011-04-01 13:28:34 +00:00
uipc_sem.c After the r219999 is merged to stable/8, rename fallocf(9) to falloc(9) 2011-04-01 13:28:34 +00:00
uipc_shm.c Add some checks to ensure that Capsicum is behaving correctly, and add some 2011-06-30 10:56:02 +00:00
uipc_sockbuf.c Revert r194662, since it breaks ng_ksocket(4) and may break 2011-04-14 14:54:22 +00:00
uipc_socket.c In the experimental soreceive_stream(): 2011-07-08 10:50:13 +00:00
uipc_syscalls.c Add some checks to ensure that Capsicum is behaving correctly, and add some 2011-06-30 10:56:02 +00:00
uipc_usrreq.c Mfp4 CH=177274,177280,177284-177285,177297,177324-177325 2011-02-16 21:29:13 +00:00
vfs_acl.c The 'acl_cnt' field is unsigned; no point in checking if it's >= 0. 2010-06-03 13:45:27 +00:00
vfs_aio.c Create a global thread hash table to speed up thread lookup, use 2010-10-09 02:50:23 +00:00
vfs_bio.c Call pmap_qremove() before freeing or unwiring the pages, otherwise 2011-07-05 18:40:37 +00:00
vfs_cache.c Fix some more style(9) issues. 2010-11-14 16:10:15 +00:00
vfs_cluster.c The hardware has caught up; improvements are now observed even at 128, 2011-03-16 16:22:59 +00:00
vfs_default.c Add a lock flags argument to the VFS_FHTOVP() file system 2011-05-22 01:07:54 +00:00
vfs_export.c
vfs_extattr.c Revert r210225 - turns out I was wrong; the "/*-" is not license-only 2010-07-18 20:57:53 +00:00
vfs_hash.c
vfs_init.c
vfs_lookup.c Add an extra comment to the SDT probes definition. This allows us to get 2010-08-22 11:18:57 +00:00
vfs_mount.c Include sys/sbuf.h directly. 2011-07-11 05:17:46 +00:00
vfs_mountroot.c Include sys/sbuf.h directly. 2011-07-11 05:17:46 +00:00
vfs_subr.c Add a new option, OBJPR_NOTMAPPED, to vm_object_page_remove(). Passing this 2011-06-29 16:40:41 +00:00
vfs_syscalls.c Add a lock flags argument to the VFS_FHTOVP() file system 2011-05-22 01:07:54 +00:00
vfs_vnops.c Use a name instead of a magic number for kern_yield(9) when the priority 2011-05-13 05:27:58 +00:00
vnode_if.src Correctly use INOUT for the offset/len parameters to vop_allocate. As 2011-05-13 14:29:28 +00:00