freebsd-skq/sys/kern
Eric Badger b38bd91f4f don't stop in issignal() if P_SINGLE_EXIT is set
Suppose a traced process is stopped in ptracestop() due to receipt of a
SIGSTOP signal, and is awaiting orders from the tracing process on how
to handle the signal. Before sending any such orders, the tracing
process exits. This should kill the traced process. But suppose a second
thread handles the SIGKILL and proceeds to exit1(), calling
thread_single(). The first thread will now awaken and will have a chance
to check once more if it should go to sleep due to the SIGSTOP.  It must
not sleep after P_SINGLE_EXIT has been set; this would prevent the
SIGKILL from taking effect, leaving a stopped orphan behind after the
tracing process dies.

Also add new tests for this condition.

Reviewed by:	kib
MFC after:	2 weeks
Sponsored by:	Dell EMC
Differential Revision:	https://reviews.freebsd.org/D9890
2017-03-07 13:41:01 +00:00
..
bus_if.m "Buses" is the preferred plural of "bus" 2017-01-15 17:54:01 +00:00
capabilities.conf Update capabilities.conf comment 2016-09-08 14:04:04 +00:00
clock_if.m
cpufreq_if.m
device_if.m Import the 'iflib' API library for network drivers. From the author: 2016-05-18 04:35:58 +00:00
genassym.sh
imgact_aout.c Implement vsyscall hack. Prior to 2.13 glibc uses vsyscall 2016-01-09 20:18:53 +00:00
imgact_binmisc.c sys/kern: spelling fixes in comments. 2016-04-29 22:15:33 +00:00
imgact_elf32.c
imgact_elf64.c
imgact_elf.c When selecting brand based on old Elf branding, prefer the brand which 2017-03-07 13:38:25 +00:00
imgact_gzip.c
imgact_shell.c
inflate.c ANSIfy inflate.c 2016-10-04 17:57:30 +00:00
init_main.c Bump struct thread alignment to 32. 2017-02-07 17:03:22 +00:00
init_sysent.c Regenerate all the system call tables to drop "created from" lines. 2017-02-10 19:45:02 +00:00
kern_acct.c Revert r312119 and reword the intent to fix -Wshadow issues 2017-01-15 09:25:33 +00:00
kern_alq.c Use SI_SUB_LAST instead of SI_SUB_SMP as the "catch-all" subsystem. 2016-03-11 23:18:06 +00:00
kern_clock.c Initialize 'ticks' earlier in boot after 'hz' is set. 2016-11-22 01:02:59 +00:00
kern_clocksource.c Remove cpu_deepest_sleep variable. 2017-02-24 16:11:55 +00:00
kern_condvar.c Introduce SCHEDULER_STOPPED_TD for use when the thread pointer was already read 2017-02-17 06:45:04 +00:00
kern_conf.c Undo r309891. Konstantin is right in that this condition normally 2016-12-12 19:11:04 +00:00
kern_cons.c Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00
kern_context.c
kern_cpu.c Add an EARLY_AP_STARTUP option to start APs earlier during boot. 2016-05-14 18:22:52 +00:00
kern_cpuset.c Add kern_cpuset_getaffinity() and kern_cpuset_getaffinity(), 2017-02-05 13:24:54 +00:00
kern_ctf.c Fix improper use of "its". 2016-11-08 23:59:41 +00:00
kern_descrip.c fd: switch fget_unlocked to atomic_fcmpset 2017-02-05 01:40:27 +00:00
kern_dtrace.c
kern_dump.c Add support for encrypted kernel crash dumps. 2016-12-10 16:20:39 +00:00
kern_environment.c Create wrappers for uint64_t and int64_t for the tunables. While not 2016-04-15 03:09:55 +00:00
kern_et.c Add labels to sysctls related to clocks. 2016-12-14 12:56:58 +00:00
kern_event.c Add kevent EVFILT_EMPTY for notification when a client has received all data 2017-01-16 08:25:33 +00:00
kern_exec.c Apply MADV_FREE to exec_map entries only after a lowmem event. 2017-02-15 01:50:58 +00:00
kern_exit.c Do not leak mount references for dying threads. 2017-02-25 10:38:18 +00:00
kern_fail.c Fix some cosmetic issues in kern_fail.c omitted from r296927. 2016-06-09 13:17:08 +00:00
kern_ffclock.c kernel: use our nitems() macro when it is available through param.h. 2016-04-19 23:48:27 +00:00
kern_fork.c Defer ptracestop() signals that cannot be delivered immediately 2017-02-20 15:53:16 +00:00
kern_gzio.c
kern_hhook.c Get closer to a VIMAGE network stack teardown from top to bottom rather 2016-06-21 13:48:49 +00:00
kern_idle.c
kern_intr.c
kern_jail.c Use inet_ntoa_r() instead of inet_ntoa() throughout the kernel 2017-02-16 20:47:41 +00:00
kern_khelp.c
kern_kthread.c Re-schedule signals after kthread exits, since apparently there are 2016-08-10 13:47:12 +00:00
kern_ktr.c Fix the logic in the ddb command 'show ktr /a'. Prior to r118269 it would 2016-01-31 17:32:20 +00:00
kern_ktrace.c ANSYfy kern_ktrace.c and remove archaic register keyword 2017-01-20 14:59:56 +00:00
kern_linker.c kern_linker: Handle module-loading failures in preloaded .ko files 2016-10-13 02:06:23 +00:00
kern_lock.c lockmgr: implement fast path 2017-02-12 09:49:44 +00:00
kern_lockf.c put very expensive sanity checks of advisory locks under DIAGNOSTIC 2017-01-30 15:20:13 +00:00
kern_lockstat.c mtx: microoptimize lockstat handling in __mtx_lock_sleep 2017-02-17 14:55:59 +00:00
kern_loginclass.c Speed up rctl operation with large rulesets, by holding the lock 2015-11-15 12:10:51 +00:00
kern_malloc.c Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00
kern_mbuf.c Import the 'iflib' API library for network drivers. From the author: 2016-05-18 04:35:58 +00:00
kern_mib.c Export a sysctl dev.<clkdom>.<unit>.clocks for each clock domain containing 2017-03-05 07:13:29 +00:00
kern_module.c Provide better debug message on kernel module name clash. 2015-10-10 09:21:55 +00:00
kern_mtxpool.c sys/kern: spelling fixes in comments. 2016-04-29 22:15:33 +00:00
kern_mutex.c KDTRACE_HOOKS isn't guaranteed to be defined. Change to check to see 2017-02-24 01:39:08 +00:00
kern_ntptime.c ANSIfy kern_ntptime.c 2017-01-25 20:22:32 +00:00
kern_numa.c
kern_osd.c osd(9): Change array pointer to array pointer type from void* 2016-04-26 19:57:35 +00:00
kern_physio.c Add four new RCTL resources - readbps, readiops, writebps and writeiops, 2016-04-07 04:23:25 +00:00
kern_pmc.c Cast values to (int) before comparing them to the range of the 2017-02-24 01:39:12 +00:00
kern_poll.c
kern_priv.c
kern_proc.c Make sure the thread constructor and destructor eventhandlers are 2017-02-19 13:15:33 +00:00
kern_procctl.c reaper: Make REAPER_KILL_SUBTREE actually work. 2016-12-14 22:49:20 +00:00
kern_prot.c proc: perform a lockless check in sys_issetugid 2017-01-24 21:48:57 +00:00
kern_racct.c try to fix RACCT_RSS accounting 2017-02-14 13:54:05 +00:00
kern_rangelock.c
kern_rctl.c sys/kern: spelling fixes in comments. 2016-04-29 22:15:33 +00:00
kern_resource.c Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00
kern_rmlock.c Bring back r313037, with fixes for mips: 2017-02-19 02:03:09 +00:00
kern_rwlock.c locks: ensure proper barriers are used with atomic ops when necessary 2017-03-01 05:06:21 +00:00
kern_sdt.c
kern_sema.c
kern_sendfile.c Move bogus_page declaration to vm_page.h and initialization to vm_page.c. 2017-01-04 22:27:19 +00:00
kern_sharedpage.c Split kerne timekeep ABI structure vdso_sv_tk out of the struct 2015-11-23 07:09:35 +00:00
kern_shutdown.c Fix compilation of r314784 on 32 bit. 2017-03-06 22:32:56 +00:00
kern_sig.c don't stop in issignal() if P_SINGLE_EXIT is set 2017-03-07 13:41:01 +00:00
kern_switch.c Add comments explaining unobvious td_critnest adjustments in 2017-01-22 19:41:42 +00:00
kern_sx.c locks: ensure proper barriers are used with atomic ops when necessary 2017-03-01 05:06:21 +00:00
kern_synch.c Introduce SCHEDULER_STOPPED_TD for use when the thread pointer was already read 2017-02-17 06:45:04 +00:00
kern_syscalls.c
kern_sysctl.c Document the existence of the {0, 6, ...} sysctl. 2016-12-15 15:45:11 +00:00
kern_tc.c Add labels to sysctls related to clocks. 2016-12-14 12:56:58 +00:00
kern_thr.c Defer ptracestop() signals that cannot be delivered immediately 2017-02-20 15:53:16 +00:00
kern_thread.c Do not leak mount references for dying threads. 2017-02-25 10:38:18 +00:00
kern_time.c Use time_t for intermediate values to avoid overflow in clock_ts_to_ct 2017-01-24 18:05:29 +00:00
kern_timeout.c Permit timed sleeps for threads other than thread0 before timers are working. 2016-11-25 18:02:43 +00:00
kern_umtx.c Add sem_clockwait_np() 2017-02-23 19:36:38 +00:00
kern_uuid.c
kern_xxx.c Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00
ksched.c
link_elf_obj.c sys/kern: spelling fixes in comments. 2016-04-29 22:15:33 +00:00
link_elf.c kern: for pointers replace 0 with NULL. 2016-04-15 16:10:11 +00:00
linker_if.m sys/kern: spelling fixes in comments. 2016-04-29 22:15:33 +00:00
Make.tags.inc Bring the tags and links entries for amd64 up to date. 2015-10-27 22:59:24 +00:00
Makefile Don't create pointless backups of generated files in "make sysent". 2016-07-28 21:29:04 +00:00
makesyscalls.sh Remove SVR4 (System V Release 4) binary compatibility support. 2017-02-28 05:14:42 +00:00
md4c.c crypto routines: Hint minimum buffer sizes to the compiler 2016-05-26 19:29:29 +00:00
md5c.c crypto routines: Hint minimum buffer sizes to the compiler 2016-05-26 19:29:29 +00:00
msi_if.m Introduce MSI and MSI-X support to intrng. This adds a new msi device 2016-05-16 09:11:40 +00:00
p1003_1b.c
pic_if.m INTRNG: Rework handling with resources. Partially revert r301453. 2016-08-19 10:52:39 +00:00
posix4_mib.c posix4_mib: Don't overrun facility_initialized array 2016-04-27 00:10:32 +00:00
sched_4bsd.c Revert r313814 and r313816 2017-02-16 21:18:31 +00:00
sched_ule.c Fix a ticks comparison in sched_pctcpu_update(). 2017-03-03 20:57:40 +00:00
serdev_if.m
stack_protector.c
subr_acl_nfs4.c
subr_acl_posix1e.c
subr_autoconf.c Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00
subr_blist.c Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00
subr_bufring.c
subr_bus_dma.c Fix a bug introduced in r291716: 2016-01-11 20:38:39 +00:00
subr_bus.c "Buses" is the preferred plural of "bus" 2017-01-15 17:54:01 +00:00
subr_busdma_bufalloc.c Fix printf format to allow for bus_size_t not being u_long on all platforms. 2015-10-20 03:25:17 +00:00
subr_capability.c capsicum: plug spurious memset in __cap_rights_init 2015-12-01 02:48:42 +00:00
subr_clock.c Use time_t for intermediate values to avoid overflow in clock_ts_to_ct 2017-01-24 18:05:29 +00:00
subr_counter.c Zero return value when counter_rate() switches over to next second and 2016-12-13 20:11:45 +00:00
subr_devmap.c Include machine/acle-compat.h in cdefs.h on arm if the compiler doesn't 2016-05-25 19:44:26 +00:00
subr_devstat.c Add support for managing Shingled Magnetic Recording (SMR) drives. 2016-05-19 14:08:36 +00:00
subr_disk.c
subr_dummy_vdso_tc.c
subr_eventhandler.c
subr_fattime.c
subr_firmware.c Fix improper use of "its". 2016-11-08 23:59:41 +00:00
subr_gtaskqueue.c Make gtaskqueue compatible with drm-next such that they can be used with the 2017-03-01 18:37:35 +00:00
subr_hash.c Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00
subr_hints.c
subr_intr.c Only allow the pic type to be either a PIC or MSI type. All interrupt 2017-02-06 13:08:48 +00:00
subr_kdb.c
subr_kobj.c
subr_lock.c locks: follow up r313386 2017-02-07 16:01:07 +00:00
subr_log.c Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00
subr_mbpool.c sys/kern: spelling fixes in comments. 2016-04-29 22:15:33 +00:00
subr_mchain.c Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00
subr_module.c
subr_msgbuf.c sys/kern: spelling fixes in comments. 2016-04-29 22:15:33 +00:00
subr_param.c Initialize 'ticks' earlier in boot after 'hz' is set. 2016-11-22 01:02:59 +00:00
subr_pcpu.c Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00
subr_pctrie.c sys: extend use of the howmany() macro when available. 2016-04-26 15:38:17 +00:00
subr_power.c
subr_prf.c Provide a comment on why stdio.h needs to be included. 2017-02-28 21:27:51 +00:00
subr_prof.c Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00
subr_rman.c Add new bus methods for mapping resources. 2016-05-20 17:57:47 +00:00
subr_rtc.c Make resettodr_lock accessible outside subr_rtc.c. Protect 2016-09-21 10:15:08 +00:00
subr_sbuf.c
subr_scanf.c Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00
subr_sfbuf.c subr_sfbus.c need sys/proc.h for struct thread definition. 2017-02-07 17:31:24 +00:00
subr_sglist.c Add sglist functions for working with arrays of VM pages. 2016-05-20 23:28:43 +00:00
subr_sleepqueue.c Fix grammar in some comments in subr_sleepqueue.c 2017-03-03 21:03:28 +00:00
subr_smp.c Handle broadcast NMIs. 2016-10-24 16:40:27 +00:00
subr_stack.c Add support for a configurable output channel to witness(4). 2015-11-19 05:56:59 +00:00
subr_syscall.c Defer ptracestop() signals that cannot be delivered immediately 2017-02-20 15:53:16 +00:00
subr_taskqueue.c Implement taskqueue_poll_is_busy() for use by the LinuxKPI. 2017-03-02 12:20:23 +00:00
subr_terminal.c Fix a panic during boot caused by inadequate locking of some vt(4) driver 2017-02-23 01:18:47 +00:00
subr_trap.c Do not leak mount references for dying threads. 2017-02-25 10:38:18 +00:00
subr_turnstile.c ddb(4): Add sleepchains to "show allchains" 2016-10-22 18:02:20 +00:00
subr_uio.c Switch copyout_map() to use vm_mmap_object() instead of vm_mmap(). 2017-02-12 20:54:31 +00:00
subr_unit.c Clean up trailing whitespace 2017-01-14 04:16:13 +00:00
subr_vmem.c subr_vmem: Fix double-free in error case of vmem_create 2016-05-11 23:16:11 +00:00
subr_witness.c Make witness_warn() always print to the console. 2017-02-05 02:27:04 +00:00
sys_capability.c capsicum: perform copyout without the fildesc lock held in sys_cap_ioctls_get 2016-10-21 16:12:23 +00:00
sys_generic.c Add kern_pread() and kern_pwrite(), and use it in compats instead 2017-01-31 15:35:18 +00:00
sys_pipe.c Generate syscall tables and update pipe() implementation after r302094. 2016-06-22 21:18:19 +00:00
sys_procdesc.c Hide the boottime and bootimebin globals, provide the getboottime(9) 2016-07-27 11:08:59 +00:00
sys_process.c Defer ptracestop() signals that cannot be delivered immediately 2017-02-20 15:53:16 +00:00
sys_socket.c Set MORETOCOME for AIO write requests on a socket. 2017-01-06 23:41:45 +00:00
syscalls.c Regenerate all the system call tables to drop "created from" lines. 2017-02-10 19:45:02 +00:00
syscalls.master Rename the 'flags' argument to getfsstat() to 'mode' and validate it. 2016-12-27 20:21:11 +00:00
systrace_args.c Regen after r310638. 2016-12-27 20:22:17 +00:00
sysv_ipc.c
sysv_msg.c Remove a comment that was part of copied code, and is misleading in 2016-06-09 15:34:33 +00:00
sysv_sem.c sys/kern: spelling fixes in comments. 2016-04-29 22:15:33 +00:00
sysv_shm.c Add shmatt_t. 2016-07-26 17:23:49 +00:00
tty_compat.c Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00
tty_info.c Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00
tty_inq.c Check tty_gone() after allocating IO buffers. The tty lock has to be 2017-01-13 16:37:38 +00:00
tty_outq.c Check tty_gone() after allocating IO buffers. The tty lock has to be 2017-01-13 16:37:38 +00:00
tty_pts.c sys/kern: spelling fixes in comments. 2016-04-29 22:15:33 +00:00
tty_tty.c
tty_ttydisc.c Don't clear the software flow control flag before draining for last 2016-01-26 14:46:39 +00:00
tty.c Correct the comments about how much buffer is allocated. 2017-01-13 17:03:23 +00:00
uipc_accf.c Use correct size type in do_setopt_accept_filter 2016-10-12 00:56:49 +00:00
uipc_debug.c Refactor the AIO subsystem to permit file-type-specific handling and 2016-03-01 18:12:14 +00:00
uipc_domain.c Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00
uipc_mbuf2.c Remove writability requirement for single-mbuf, contiguous-range 2017-01-12 06:38:03 +00:00
uipc_mbuf.c Suppress a warning about m_assertbuf being unused. 2017-01-15 03:53:20 +00:00
uipc_mbufhash.c
uipc_mqueue.c Fix panic with unlocked vnode to vrecycle(). 2017-02-18 05:07:53 +00:00
uipc_sem.c Clean up some style(9) violations. 2016-04-14 17:07:26 +00:00
uipc_shm.c Consistently handle negative or wrapping offsets in the mmap(2) syscalls. 2017-02-12 21:05:44 +00:00
uipc_sockbuf.c Fix the KASSERT check from r314813. 2017-03-07 06:46:38 +00:00
uipc_socket.c Merge filt_soread and filt_solisten and decide what to do when checking 2017-02-01 13:12:07 +00:00
uipc_syscalls.c Add kern_listen(), kern_shutdown(), and kern_socket(), and use them 2017-01-30 12:57:22 +00:00
uipc_usrreq.c For non-listening AF_UNIX sockets return error code EOPNOTSUPP to match 2017-01-25 22:26:45 +00:00
vfs_acl.c
vfs_aio.c Rework r313352. 2017-02-13 09:04:38 +00:00
vfs_bio.c Do not set BIO_DONE if the BIO specifies a completion handler. 2017-01-10 21:41:28 +00:00
vfs_cache.c cache: use vrefact for '.' lookups and refing the rdir in fullpath 2017-01-30 03:20:05 +00:00
vfs_cluster.c Move bogus_page declaration to vm_page.h and initialization to vm_page.c. 2017-01-04 22:27:19 +00:00
vfs_default.c Make the code match the comments: If we have ANY buf's that failed 2017-02-21 18:56:06 +00:00
vfs_export.c Fix build when no INET and INET6 in kernel config. 2016-11-17 16:13:30 +00:00
vfs_extattr.c
vfs_hash.c Add vfs_hash_ref(9) function, which finds a vnode by the hash value 2016-05-11 06:32:22 +00:00
vfs_init.c Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00
vfs_lookup.c Provide fallback VOP methods for crossmp vnode. 2017-01-22 19:36:02 +00:00
vfs_mount.c Do not allocate struct statfs on kernel stack. 2017-01-05 17:19:26 +00:00
vfs_mountroot.c Make root_mount_hold() work after boot. This is important for two 2017-02-06 20:44:34 +00:00
vfs_subr.c vfs: use atomic_fcmpset in vfs_refcount_* 2017-02-05 03:23:16 +00:00
vfs_syscalls.c Replace calls to sys_truncate() with kern_truncate(). 2017-01-31 15:19:44 +00:00
vfs_vnops.c Apply noexec mount option for mmap(PROT_EXEC). 2017-02-19 20:51:04 +00:00
vnode_if.src Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00