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freebsd-skq/sys/kern
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Konstantin Belousov aef68c961a When delivering a signal with default disposition to the thread, 
tdsigwakeup() increases the priority of the low-priority threads, to
give them a chance to be terminated timely.  Also, kernel allows user
to signal kernel processes.  The combined effect is that signalling
idle process bump a priority of the selected delivery thread, which
starts eating CPU.

Check for the delivery thread be an idle thread and do not raise its
priority then.

The signal delivery to the kernel threads must be opt-in feature.
Kernel thread should explicitely declare the ability to handle signals
directed to it.  E.g., nfsd threads check for signal as an indication
of exit request.

Most threads do not handle signals at all, and queuing the signal to
them causes odd side-effects.  Most innocent consequence is the memory
leak due to queued ksiginfo, which is never deleted from the sigqueue.
Code to prevent even queuing signals to the kernel threads is trivial,
but it requires careful examination of each call to kproc/kthread
creation to decide should the signalling be allowed.  The commit is a
stop-gap measure which fixes the immediate case for now.

PR:	200493
Reported and tested by:	trasz
Discussed with:	trasz, emaste
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2015-05-29 16:26:08 +00:00
..
bus_if.m Add a bus method to fetch the VM domain for the given device/bus. 2014-10-09 05:33:25 +00:00
capabilities.conf Add futimens and utimensat system calls. 2015-01-23 21:07:08 +00:00
clock_if.m
cpufreq_if.m
device_if.m Change the default method for device_quiesce() to return 0 instead of 2015-01-08 21:46:28 +00:00
genassym.sh
imgact_aout.c In preparation for switching linuxulator to the use the native 1:1 2015-05-24 14:51:29 +00:00
imgact_binmisc.c Allow multiple image activators to run on the same execution by changing 2014-09-04 21:31:25 +00:00
imgact_elf32.c
imgact_elf64.c
imgact_elf.c Fix typo in symbol name. It helps to hit save in all your buffers 2015-05-22 21:10:14 +00:00
imgact_gzip.c Add a mmap flag (MAP_32BIT) on 64-bit platforms to request that a mapping use 2013-09-09 18:11:59 +00:00
imgact_shell.c Allow multiple image activators to run on the same execution by changing 2014-09-04 21:31:25 +00:00
inflate.c
init_main.c In preparation for switching linuxulator to the use the native 1:1 2015-05-24 14:51:29 +00:00
init_sysent.c Regen. 2015-04-18 21:50:53 +00:00
kern_acct.c
kern_alq.c Prevent alq from panic when the invalid alq_file path specified. 2014-04-05 16:54:47 +00:00
kern_clock.c Initialize ticks so that it wraps 10 minutes after boot to increase the 2015-02-05 01:43:21 +00:00
kern_clocksource.c Add ddb command 'show clocksource' to display state of the per-cpu 2015-02-04 14:49:47 +00:00
kern_condvar.c Revert r282971. It depends on condvar consumers not destroying condvars 2015-05-21 16:43:26 +00:00
kern_conf.c Fix for out of order device destruction notifications when using the 2015-03-22 13:11:56 +00:00
kern_cons.c CALLOUT_MPSAFE has lost its meaning since r141428, i.e., for more than ten 2015-05-22 17:05:21 +00:00
kern_context.c
kern_cpu.c Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
kern_cpuset.c Allow sizeof(cpuset_t) to be queried in capability mode. 2015-05-14 15:14:03 +00:00
kern_ctf.c Don't specify a resid parameter if we're just going to ignore it. Instead, 2015-02-20 20:49:00 +00:00
kern_descrip.c fd: fix imbalanced fdp unlock in F_SETLK and F_GETLK 2015-05-18 14:27:04 +00:00
kern_dtrace.c Commit the rest of the changes that were intended to be part of r266826. 2014-05-29 01:42:22 +00:00
kern_dump.c Factor out duplicated code from dumpsys() on each architecture into generic 2015-01-07 01:01:39 +00:00
kern_environment.c Test if 'env' is NULL before doing memset() and strlen(), 2014-10-23 18:23:50 +00:00
kern_et.c Trivial change / forced-commit to document prior change that slipped in 2015-03-16 19:29:19 +00:00
kern_event.c For future use in the Linuxulator: 2015-05-24 16:36:29 +00:00
kern_exec.c On exec, single-threading must be enforced before arguments space is 2015-05-10 09:00:40 +00:00
kern_exit.c Remove several write-only variables, all reported by the gcc 4.9 2015-05-29 13:24:17 +00:00
kern_fail.c Use a regular sbuf + SYSCTL_OUT() rather than sbuf_new_for_sysctl() with 2015-03-16 19:18:45 +00:00
kern_ffclock.c The SYSCTL data pointers can come from userspace and must not be 2014-10-28 12:00:39 +00:00
kern_fork.c Add KTR tracing for some MI ptrace events. 2015-05-25 22:13:22 +00:00
kern_gzio.c Move zlib.c from net to libkern. 2015-04-22 14:38:58 +00:00
kern_hhook.c
kern_idle.c
kern_intr.c Remove support for Xen PV domU kernels. Support for HVM domU kernels 2015-04-30 15:48:48 +00:00
kern_jail.c Add kern.racct.enable tunable and RACCT_DISABLED config option. 2015-04-29 10:23:02 +00:00
kern_khelp.c
kern_kthread.c The umtx_lock mutex is used by top-half of the kernel, but is 2015-02-28 04:19:02 +00:00
kern_ktr.c Expand ktr_mask to be a 64-bit unsigned integer. 2015-05-22 11:09:41 +00:00
kern_ktrace.c Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
kern_linker.c Const poison in a few places to ensure we don't modify things 2014-12-03 22:14:13 +00:00
kern_lock.c Revert for r277213: 2015-01-22 11:12:42 +00:00
kern_lockf.c Improve style and fix a possible use-after-free case introduced in r268384 2015-01-10 06:48:35 +00:00
kern_lockstat.c - For kernel compiled only with KDTRACE_HOOKS and not any lock debugging 2013-11-25 07:38:45 +00:00
kern_loginclass.c cred: add proc_set_cred helper 2015-03-16 00:10:03 +00:00
kern_malloc.c The vmem callback to reclaim kmem arena address space on low or 2015-05-09 20:08:36 +00:00
kern_mbuf.c Fix integer truncation bug in malloc(9) 2015-04-01 12:42:26 +00:00
kern_mib.c Allow the kern.osrelease and kern.osreldate sysctl values to be set in a 2015-02-27 16:28:55 +00:00
kern_module.c
kern_mtxpool.c Garbage collect mtxpool_lockbuilder, the mutex pool historically used 2014-05-02 07:57:40 +00:00
kern_mutex.c Add _NEW flag to mtx(9), sx(9), rmlock(9) and rwlock(9). 2014-12-13 21:00:10 +00:00
kern_ntptime.c Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
kern_osd.c Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
kern_physio.c Rewrite physio() to not allocate pbufs for unmapped I/O. 2015-04-21 10:55:53 +00:00
kern_pmc.c Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
kern_poll.c When a kernel has DEVICE_POLLING turned on but no drivers have 2015-04-14 14:22:34 +00:00
kern_priv.c Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
kern_proc.c Make setproctitle(3) work in Capsicum capability mode. This makes 2015-04-27 11:18:16 +00:00
kern_procctl.c Reparenting done by debugger attach can leave reaper without direct 2015-02-15 08:44:30 +00:00
kern_prot.c cred: add proc_set_cred_init helper 2015-03-21 20:24:54 +00:00
kern_racct.c Build GENERIC with RACCT/RCTL support by default. Note that it still 2015-05-14 14:03:55 +00:00
kern_rangelock.c Change the queue of locks in kern_rangelock.c from holding lock requests in 2013-08-15 20:19:17 +00:00
kern_rctl.c Add kern.racct.enable tunable and RACCT_DISABLED config option. 2015-04-29 10:23:02 +00:00
kern_resource.c Implement support for binary to requesting specific stack size for the 2015-04-15 08:13:53 +00:00
kern_rmlock.c Add _NEW flag to mtx(9), sx(9), rmlock(9) and rwlock(9). 2014-12-13 21:00:10 +00:00
kern_rwlock.c Add _NEW flag to mtx(9), sx(9), rmlock(9) and rwlock(9). 2014-12-13 21:00:10 +00:00
kern_sdt.c Print a backtrace if the SDT(9) stub gets called so that there's at least 2014-02-22 01:41:45 +00:00
kern_sema.c
kern_sharedpage.c Remove the deprecated VM_ALLOC_RETRY flag for the vm_page_grab(9). 2013-08-22 07:39:53 +00:00
kern_shutdown.c Properly null-terminate strings in a kernel dump header. A version string 2015-05-19 16:23:47 +00:00
kern_sig.c When delivering a signal with default disposition to the thread, 2015-05-29 16:26:08 +00:00
kern_switch.c Revert for r277213: 2015-01-22 11:12:42 +00:00
kern_sx.c Add _NEW flag to mtx(9), sx(9), rmlock(9) and rwlock(9). 2014-12-13 21:00:10 +00:00
kern_synch.c Remove several write-only variables, all reported by the gcc 4.9 2015-05-29 13:24:17 +00:00
kern_syscalls.c Fix up module unload for syscall_module_handler consumers. 2014-11-01 22:36:40 +00:00
kern_sysctl.c Implement a simple OID number garbage collector. Given the increasing 2015-03-25 08:55:34 +00:00
kern_tc.c Implement a mechanism for making changes in the kernel<->driver PPS 2015-05-04 17:59:39 +00:00
kern_thr.c In preparation for switching linuxulator to the use the native 1:1 2015-05-24 14:37:45 +00:00
kern_thread.c In preparation for switching linuxulator to the use the native 1:1 2015-05-24 14:51:29 +00:00
kern_time.c Fix an off by one in ppsratecheck(). If you asked for N=1 you'd get one, 2015-01-11 20:48:29 +00:00
kern_timeout.c Fix my stupid restoral of old code.. must be c_iflags now. 2015-04-14 00:02:39 +00:00
kern_umtx.c Clean up some cosmetic nits in kern_umtx.c, found during recent work 2015-03-28 21:21:40 +00:00
kern_uuid.c Fix a bug in be_uuid_dec(); it called le16dec() instead of be16dec(), 2014-02-13 22:24:36 +00:00
kern_xxx.c
ksched.c
link_elf_obj.c Move zlib.c from net to libkern. 2015-04-22 14:38:58 +00:00
link_elf.c Move zlib.c from net to libkern. 2015-04-22 14:38:58 +00:00
linker_if.m
Make.tags.inc Remove AppleTalk support. 2014-03-14 06:29:43 +00:00
Makefile
makesyscalls.sh Fix syscalls that can be loaded as kernel modules - they were not given 2013-12-15 23:19:42 +00:00
md4c.c
md5c.c
p1003_1b.c In preparation for switching linuxulator to the use the native 1:1 2015-05-24 14:44:06 +00:00
posix4_mib.c
sched_4bsd.c Add kern.racct.enable tunable and RACCT_DISABLED config option. 2015-04-29 10:23:02 +00:00
sched_ule.c Use sbuf_new_for_sysctl() instead of plain sbuf_new() to ensure sysctl 2015-03-14 18:42:30 +00:00
serdev_if.m
stack_protector.c
subr_acl_nfs4.c
subr_acl_posix1e.c
subr_autoconf.c
subr_blist.c
subr_bufring.c
subr_bus_dma.c Add bus_dmamap_load_ma() function to load map with the array of 2013-10-27 21:39:16 +00:00
subr_bus.c Fix handling of BUS_PROBE_NOWILDCARD in 'device_probe_child()'. 2015-04-15 16:22:05 +00:00
subr_busdma_bufalloc.c Fix integer truncation bug in malloc(9) 2015-04-01 12:42:26 +00:00
subr_capability.c Remove duplicated includes. 2014-06-26 13:57:44 +00:00
subr_clock.c For architectures where time_t is wide enough, in particular, 64bit 2014-12-12 09:37:18 +00:00
subr_counter.c Create two public UMA_ZONE_PCPU zones: 64 bit sized and pointer sized. 2014-02-10 19:59:46 +00:00
subr_devstat.c Fix multiple incorrect SYSCTL arguments in the kernel: 2014-10-21 07:31:21 +00:00
subr_disk.c
subr_dnvlist.c Remove the nvlist_.*[fv] functions. 2015-04-29 22:57:04 +00:00
subr_dummy_vdso_tc.c Update the vdso timehands only via tc_windup(). 2015-01-20 03:54:30 +00:00
subr_eventhandler.c
subr_fattime.c Where appropriate, use the modern terms for the one true time base 2014-12-21 05:07:11 +00:00
subr_firmware.c
subr_hash.c
subr_hints.c Add a new device control utility for new-bus devices called devctl. This 2015-02-06 16:09:01 +00:00
subr_kdb.c Fix multiple incorrect SYSCTL arguments in the kernel: 2014-10-21 07:31:21 +00:00
subr_kobj.c
subr_lock.c Add _NEW flag to mtx(9), sx(9), rmlock(9) and rwlock(9). 2014-12-13 21:00:10 +00:00
subr_log.c
subr_mbpool.c All mbuf external free functions never fail, so let them be void. 2014-07-11 13:58:48 +00:00
subr_mchain.c
subr_module.c Turns out, this isn't only called from i386... 2014-12-30 02:39:47 +00:00
subr_msgbuf.c Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
subr_nvlist.c Fix memory leak. 2015-05-20 17:48:22 +00:00
subr_nvpair.c Style. 2015-05-20 17:47:01 +00:00
subr_param.c Remove support for Xen PV domU kernels. Support for HVM domU kernels 2015-04-30 15:48:48 +00:00
subr_pcpu.c Create two public UMA_ZONE_PCPU zones: 64 bit sized and pointer sized. 2014-02-10 19:59:46 +00:00
subr_pctrie.c
subr_power.c
subr_prf.c Always send log(9) messages to the message buffer. 2015-04-20 20:03:26 +00:00
subr_prof.c The process spin lock currently has the following distinct uses: 2014-11-26 14:10:00 +00:00
subr_rman.c Nuke the never-used RF_TIMESHARE feature, reducing the complexity of the 2014-07-16 22:18:19 +00:00
subr_rtc.c
subr_sbuf.c The minimum sbuf buffer size is 2 bytes (a byte plus a nulterm), assert that. 2015-03-17 21:00:31 +00:00
subr_scanf.c
subr_sfbuf.c Move KASSERT into locked region. 2014-08-11 15:06:07 +00:00
subr_sglist.c Fix a couple of panics when detaching from a cxgbe/cxl interface that was 2015-01-26 16:26:28 +00:00
subr_sleepqueue.c Revert for r277213: 2015-01-22 11:12:42 +00:00
subr_smp.c Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
subr_stack.c
subr_syscall.c Thread waiting for the vfork(2)-ed child to exec or exit, must allow 2014-12-08 16:18:05 +00:00
subr_taskqueue.c MFuser/delphij/zfs-arc-rebase@r281754: 2015-05-26 01:40:33 +00:00
subr_terminal.c vt(4): Adjust the cursor position after changing the window size 2014-11-01 17:05:15 +00:00
subr_trap.c Currently, softupdate code detects overstepping on the workitems 2015-05-27 09:20:42 +00:00
subr_turnstile.c ddb: finish converting boolean values. 2015-05-21 15:16:18 +00:00
subr_uio.c Add type qualifier volatile to the base (userspace) address argument 2014-10-31 17:43:21 +00:00
subr_unit.c Move the definition of the struct unrhdr into a separate header file, 2013-08-30 07:37:45 +00:00
subr_vmem.c CALLOUT_MPSAFE has lost its meaning since r141428, i.e., for more than ten 2015-05-22 17:05:21 +00:00
subr_witness.c ddb: finish converting boolean values. 2015-05-21 15:16:18 +00:00
sys_capability.c cred: add proc_set_cred helper 2015-03-16 00:10:03 +00:00
sys_generic.c The lseek(2), mmap(2), truncate(2), ftruncate(2), pread(2), and 2015-04-18 21:50:13 +00:00
sys_pipe.c fd: remove filedesc argument from fdclose 2015-04-11 15:40:28 +00:00
sys_procdesc.c Add a new fo_fill_kinfo fileops method to add type-specific information to 2014-09-22 16:20:47 +00:00
sys_process.c Add KTR tracing for some MI ptrace events. 2015-05-25 22:13:22 +00:00
sys_socket.c In preparation of merging projects/sendfile, transform bare access to 2014-11-12 09:57:15 +00:00
syscalls.c Regen. 2015-04-18 21:50:53 +00:00
syscalls.master The lseek(2), mmap(2), truncate(2), ftruncate(2), pread(2), and 2015-04-18 21:50:13 +00:00
systrace_args.c Regen. 2015-04-18 21:50:53 +00:00
sysv_ipc.c
sysv_msg.c Add kern.racct.enable tunable and RACCT_DISABLED config option. 2015-04-29 10:23:02 +00:00
sysv_sem.c Add kern.racct.enable tunable and RACCT_DISABLED config option. 2015-04-29 10:23:02 +00:00
sysv_shm.c Add kern.racct.enable tunable and RACCT_DISABLED config option. 2015-04-29 10:23:02 +00:00
tty_compat.c
tty_info.c
tty_inq.c
tty_outq.c
tty_pts.c fd: remove filedesc argument from fdclose 2015-04-11 15:40:28 +00:00
tty_tty.c
tty_ttydisc.c
tty.c filedesc: simplify fget_unlocked & friends 2015-02-17 23:54:06 +00:00
uipc_accf.c The accept filter code is not specific to the FreeBSD IPv4 network stack, 2014-07-26 19:27:34 +00:00
uipc_debug.c Merge from projects/sendfile: 2014-11-30 12:52:33 +00:00
uipc_domain.c CALLOUT_MPSAFE has lost its meaning since r141428, i.e., for more than ten 2015-05-22 17:05:21 +00:00
uipc_mbuf2.c Remove a 'This is dumb' comment that has been incorrect for at least a 2015-01-09 12:08:51 +00:00
uipc_mbuf.c m_dup() is supposed to give a writable copy of an mbuf chain. It uses 2015-05-07 18:35:01 +00:00
uipc_mbufhash.c Reduce header pollution. 2015-03-17 14:16:50 +00:00
uipc_mqueue.c fd: remove filedesc argument from fdclose 2015-04-11 15:40:28 +00:00
uipc_sem.c fd: remove filedesc argument from fdclose 2015-04-11 15:40:28 +00:00
uipc_shm.c Use correct length for sparse uiomove(). It must be the clipped to 2015-04-24 22:05:12 +00:00
uipc_sockbuf.c In sbappend*() family of functions clear M_PROTO flags of incoming 2014-12-22 15:39:24 +00:00
uipc_socket.c soreceive_generic() still has similar KASSERT(), therefore instead of 2015-02-23 15:24:43 +00:00
uipc_syscalls.c Replace struct filedesc argument in getsock_cap with struct thread 2015-04-11 16:00:33 +00:00
uipc_usrreq.c The VOP_LOOKUP() implementations for CREATE op do not put the name 2014-12-18 10:01:12 +00:00
vfs_acl.c Replace some calls to fuword() by fueword() with proper error checking. 2014-10-28 15:28:20 +00:00
vfs_aio.c Make AIO to not allocate pbufs for unmapped I/O like r281825. 2015-04-22 18:11:34 +00:00
vfs_bio.c Partially revert r255986: do not call VOP_FSYNC() when helping 2015-04-27 11:13:19 +00:00
vfs_cache.c Modify kern___getcwd() to take max pathlen limit as an additional 2015-04-21 13:55:24 +00:00
vfs_cluster.c Remove several write-only variables, all reported by the gcc 4.9 2015-05-29 13:24:17 +00:00
vfs_default.c Fix the comment introduced in r276192 so that it clearly 2014-12-25 14:44:04 +00:00
vfs_export.c After the changes in r274118 make NOIP kernels compile by hiding an 2014-11-06 12:19:39 +00:00
vfs_extattr.c Update kernel inclusions of capability.h to use capsicum.h instead; some 2014-03-16 10:55:57 +00:00
vfs_hash.c Convert vfs hash lock from a mutex to an rwlock. 2014-12-30 21:40:45 +00:00
vfs_init.c Remove several write-only variables, all reported by the gcc 4.9 2015-05-29 13:24:17 +00:00
vfs_lookup.c Fix two issues with lockmgr(9) LK_CAN_SHARE() test, which determines 2014-11-02 13:10:31 +00:00
vfs_mount.c Right now, dounmount() is called with unreferenced mount point. 2015-05-27 09:22:50 +00:00
vfs_mountroot.c Remove the no-at variants of the kern_xx() syscall helpers. E.g., we 2014-11-13 18:01:51 +00:00
vfs_subr.c Right now, dounmount() is called with unreferenced mount point. 2015-05-27 09:22:50 +00:00
vfs_syscalls.c Tidy up sys_umask a little bit 2015-05-18 13:43:33 +00:00
vfs_vnops.c Add V_MNTREF flag to the vn_start_write(9) and 2015-05-27 09:21:47 +00:00
vnode_if.src Catch up on r271387 and remove unused parameter from 2015-03-30 22:49:26 +00:00