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freebsd-skq/sys/kern
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John Baldwin e012fe34cb Discard the correct thread event reported for a ptrace stop. 
When multiple threads wish to report a tracing event to a debugger,
both threads call ptracestop() and one thread will win the race to be
the reporting thread (p->p_xthread).  The debugger uses PT_LWPINFO
with the process ID to determine which thread / LWP is reporting an
event and the details of that event.  This event is cleared as a side
effect of the subsequent ptrace event that resumed the process
(PT_CONTINUE, PT_STEP, etc.).  However, ptrace() was clearing the
event identified by the LWP ID passed to the resume request even if
that wasn't the 'p_xthread'.  This could result in clearing an event
that had not yet been observed by the debugger and leaving the
existing event for 'p_thread' pending so that it was reported a second
time.

Specifically, if the debugger stopped due to a software breakpoint in
one thread, but then switched to another thread that was used to
resume (e.g. if the user switched to a different thread and issued a
step), the resume request (PT_STEP) cleared a pending event (if any)
for the thread being stepped.  However, the process immediately
stopped and the first thread reported it's breakpoint event a second
time.  The debugger decremented the PC for "both" breakpoint events
which resulted in the PC now pointing into the middle of an
instruction (on x86) and a SIGILL fault when the process was resumed a
second time.

To fix, always clear the pending event for 'p_xthread' when resuming a
process.  ptrace() still honors the requested LWP ID when enabling
single-stepping (PT_STEP) or setting a different PC (PT_CONTINUE).

Reported by:	GDB testsuite (gdb.threads/continue-pending-status.exp)
Reviewed by:	kib
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D12794
2017-10-27 03:16:19 +00:00
..
bus_if.m "Buses" is the preferred plural of "bus" 2017-01-15 17:54:01 +00:00
capabilities.conf allow posix_fallocate in capability mode 2017-10-12 15:45:53 +00:00
clock_if.m
cpufreq_if.m
device_if.m
genassym.sh Don't prefix zero with 0x in assym.s. 2017-04-13 15:43:44 +00:00
imgact_aout.c Revert r323722. A better fix will be committed shortly, as well as 2017-09-28 08:38:24 +00:00
imgact_binmisc.c tighten buffer bounds in imgact_binmisc_populate_interp 2017-03-21 18:02:14 +00:00
imgact_elf32.c
imgact_elf64.c
imgact_elf.c Add AT_HWCAP2 ELF auxiliary vector. 2017-10-21 12:05:01 +00:00
imgact_gzip.c
imgact_shell.c
inflate.c Remove register keyword from sys/ and ANSIfy prototypes 2017-05-17 00:34:34 +00:00
init_main.c Move struct syscall_args syscall arguments parameters container into 2017-06-12 21:03:23 +00:00
init_sysent.c regen init_sysent.c r324560 2017-10-12 15:48:37 +00:00
kern_acct.c Commit the 64-bit inode project. 2017-05-23 09:29:05 +00:00
kern_alq.c
kern_clock.c Remove register keyword from sys/ and ANSIfy prototypes 2017-05-17 00:34:34 +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
kern_cpuset.c Fix size to copyout(9) for cpuset_getid(2). 2017-08-22 20:46:29 +00:00
kern_ctf.c Fix improper use of "its". 2016-11-08 23:59:41 +00:00
kern_descrip.c ddb show files: fix up file types and whitespace 2017-06-14 07:46:52 +00:00
kern_dtrace.c Sprinkle __read_frequently on few obvious places. 2017-09-06 20:33:33 +00:00
kern_dump.c Move kernel dump offset tracking into MI code. 2017-10-18 15:38:05 +00:00
kern_environment.c
kern_et.c Add labels to sysctls related to clocks. 2016-12-14 12:56:58 +00:00
kern_event.c Do not cast struct kevent_args or struct freebsd11_kevent_args to 2017-06-29 14:40:33 +00:00
kern_exec.c execve: avoid one proc lock/unlock trip unless PTRACE_EXEC is set 2017-10-19 00:46:15 +00:00
kern_exit.c Avoid reusing p_ksi while it is on queue. 2017-03-12 13:58:51 +00:00
kern_fail.c Avoid open-coding PRI_UNCHANGED. 2017-05-18 18:24:11 +00:00
kern_ffclock.c
kern_fork.c If the user tries to set kern.randompid to 1 (which is meaningless), set 2017-09-10 15:01:29 +00:00
kern_gzio.c Add support for compressed kernel dumps. 2017-10-25 00:51:00 +00:00
kern_hhook.c
kern_idle.c
kern_intr.c Extend cpuset_get/setaffinity() APIs 2017-05-03 18:41:08 +00:00
kern_jail.c Jails: Optionally prevent jailed root from binding to privileged ports 2017-06-06 02:15:00 +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 a couple of comment typos 2017-08-15 02:21:02 +00:00
kern_ktrace.c Ktracing kevent(2) calls with unusual arguments might leads to an 2017-03-12 13:48:24 +00:00
kern_linker.c sysctl-s in a module should be accessible only when the module is initialized 2017-10-05 12:32:14 +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 Sprinkle __read_frequently on few obvious places. 2017-09-06 20:33:33 +00:00
kern_loginclass.c
kern_malloc.c Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00
kern_mbuf.c Improvements to sendfile(2) mbuf free routine. 2017-10-09 21:06:16 +00:00
kern_mib.c All these files need sys/vmmeter.h, but now they got it implicitly 2017-04-17 17:07:00 +00:00
kern_module.c
kern_mtxpool.c
kern_mutex.c mtx: implement thread lock fastpath 2017-10-21 22:40:09 +00:00
kern_ntptime.c ANSIfy kern_ntptime.c 2017-01-25 20:22:32 +00:00
kern_numa.c Remove unneeded include of vm_phys.h. 2017-04-17 16:51:04 +00:00
kern_osd.c
kern_physio.c
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 Let stack_create(9) take a malloc flags argument. 2017-10-06 21:52:28 +00:00
kern_procctl.c reaper: Make REAPER_KILL_SUBTREE actually work. 2016-12-14 22:49:20 +00:00
kern_prot.c Add security.bsd.see_jail_proc 2017-05-23 16:59:24 +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
kern_resource.c Remove register keyword from sys/ and ANSIfy prototypes 2017-05-17 00:34:34 +00:00
kern_rmlock.c Corrected misspelled versions of rendezvous. 2017-04-09 02:00:03 +00:00
kern_rwlock.c rwlock: reduce lockstat branches in the slowpath 2017-10-20 03:32:42 +00:00
kern_sdt.c sdt: make all sdt probe sites test one variable 2017-10-22 20:22:23 +00:00
kern_sema.c
kern_sendfile.c Address two problems with sendfile(..., SF_NOCACHE) and apply one 2017-10-13 16:31:50 +00:00
kern_sharedpage.c
kern_shutdown.c Handle RB_POWERCYCLE in the MI part of the kernel 2017-10-25 15:30:44 +00:00
kern_sig.c Re-evaluate thread' signal mask after ptracestop(). 2017-10-16 20:21:51 +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: take the number of readers into account when waiting 2017-10-05 19:18:02 +00:00
kern_synch.c - Remove 'struct vmmeter' from 'struct pcpu', leaving only global vmmeter 2017-04-17 17:34:47 +00:00
kern_syscalls.c
kern_sysctl.c sysctl: only take mem lock if oldlen is > 4 * PAGE_SIZE 2017-10-19 01:38:31 +00:00
kern_tc.c The th_bintime, th_microtime and th_nanotime members of the timehand 2017-10-11 11:03:11 +00:00
kern_thr.c Defer ptracestop() signals that cannot be delivered immediately 2017-02-20 15:53:16 +00:00
kern_thread.c Move struct syscall_args syscall arguments parameters container into 2017-06-12 21:03:23 +00:00
kern_time.c Add clock_nanosleep() 2017-03-19 00:51:12 +00:00
kern_timeout.c Remove register keyword from sys/ and ANSIfy prototypes 2017-05-17 00:34:34 +00:00
kern_umtx.c When the RTC is adjusted, reevaluate absolute sleep times based on the RTC 2017-03-14 19:06:44 +00:00
kern_uuid.c Hint at the intended usage for the "ll" field of struct uuid_private. 2017-06-13 15:37:04 +00:00
kern_xxx.c Remove register keyword from sys/ and ANSIfy prototypes 2017-05-17 00:34:34 +00:00
ksched.c
link_elf_obj.c Reduce stack usage in link_elf_load_file(), allocating struct nameidata. 2017-03-09 00:45:15 +00:00
link_elf.c
linker_if.m
Make.tags.inc
Makefile Don't create pointless backups of generated files in "make sysent". 2016-07-28 21:29:04 +00:00
makesyscalls.sh Commit the 64-bit inode project. 2017-05-23 09:29:05 +00:00
md4c.c
md5c.c
msi_if.m
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 Make p1003_1b.aio_listio_max a tunable 2017-08-08 16:14:31 +00:00
sched_4bsd.c Remove register keyword from sys/ and ANSIfy prototypes 2017-05-17 00:34:34 +00:00
sched_ule.c Don't take Giant for SMP status and cpu topology sysctls. 2017-10-18 22:00:44 +00:00
serdev_if.m
stack_protector.c
subr_acl_nfs4.c
subr_acl_posix1e.c
subr_autoconf.c Add config_intrhook_oneshot(): schedule an intrhook function and unregister 2017-08-13 18:10:24 +00:00
subr_blist.c The recent change to initialization of blists (r324420) relied on '-1' 2017-10-09 18:19:06 +00:00
subr_bufring.c
subr_bus_dma.c Add CAM/NVMe support for CAM_DATA_SG 2017-08-29 15:29:57 +00:00
subr_bus.c Add eventhandler notifications for newbus device attach/detach. 2017-10-08 17:33:49 +00:00
subr_busdma_bufalloc.c
subr_capability.c
subr_clock.c Add common code to support realtime clocks that store year without century. 2017-07-23 21:28:00 +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 o Replace __riscv__ with __riscv 2017-08-07 14:09:57 +00:00
subr_devstat.c
subr_disk.c
subr_dummy_vdso_tc.c
subr_eventhandler.c Restore the ability to deregister an eventhandler from within the callback. 2017-10-08 17:21:16 +00:00
subr_fattime.c
subr_firmware.c Fix improper use of "its". 2016-11-08 23:59:41 +00:00
subr_gtaskqueue.c Fix "taskqgroup_attach: setaffinity failed: 3" with iflib drivers 2017-10-05 14:43:30 +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 Fix compile error with option DEBUG. This is fallout from some long-ago 2017-08-16 16:51:55 +00:00
subr_kdb.c Change kdb_active type to u_char. 2017-10-22 13:42:56 +00:00
subr_kobj.c - Also outside of the KOBJOPLOOKUP macro - which in turn is used by 2017-05-08 21:08:39 +00:00
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_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
subr_param.c Allow sysctl kern.vm_guest to return bhyve when running under bhyve. 2017-06-08 04:02:14 +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 Make the number of children for pctrie node available outside subr_pctrie.c. 2017-07-27 16:40:14 +00:00
subr_power.c
subr_prf.c kvprintf %b enhancements 2017-07-12 07:30:14 +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
subr_rtc.c Add clock_schedule(), a feature that allows realtime clock drivers to 2017-07-31 01:18:21 +00:00
subr_sbuf.c An off-by-one error exists in sbuf_vprintf()'s use of SBUF_HASROOM() when an 2017-08-18 02:06:28 +00:00
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_append_sglist(). 2017-05-16 23:31:52 +00:00
subr_sleepqueue.c Make the sleepq chain hash size configurable per-arch and bump on amd64. 2017-10-22 20:43:50 +00:00
subr_smp.c Don't take Giant for SMP status and cpu topology sysctls. 2017-10-18 22:00:44 +00:00
subr_stack.c Let stack_create(9) take a malloc flags argument. 2017-10-06 21:52:28 +00:00
subr_syscall.c Move struct syscall_args syscall arguments parameters container into 2017-06-12 21:03:23 +00:00
subr_taskqueue.c Add taskqueue_enqueue_timeout_sbt(), because sometimes you want more control 2017-07-31 00:54:50 +00:00
subr_terminal.c Oops, my fix for bright colors broke bright black some more (in cases 2017-03-27 10:48:28 +00:00
subr_trap.c - Remove 'struct vmmeter' from 'struct pcpu', leaving only global vmmeter 2017-04-17 17:34:47 +00:00
subr_turnstile.c Remove unused declaration and update ddb.4 2017-08-24 19:16:25 +00:00
subr_uio.c Simplify UIO_SYSSPACE and UIO_NOCOPY paths in uiomove 2017-07-06 15:03:54 +00:00
subr_unit.c Properly reset the fields in clean_unrhdr. 2017-10-16 16:14:50 +00:00
subr_vmem.c Start annotating global _padalign locks with __exclusive_cache_line 2017-09-06 20:28:18 +00:00
subr_witness.c Bump WITNESS_PENDLIST to accomodate sleepq chain bump. 2017-10-23 01:00:35 +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 Fix NULL pointer dereference and panic with shm file pread/pwrite. 2017-03-10 10:09:44 +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 Discard the correct thread event reported for a ptrace stop. 2017-10-27 03:16:19 +00:00
sys_socket.c Don't grab SOCK_LOCK for soref() when queuing an AIO request. 2017-08-25 23:10:27 +00:00
syscalls.c Regen. 2017-06-17 00:58:19 +00:00
syscalls.master Add abstime kqueue(2) timers and expand struct kevent members. 2017-06-17 00:57:26 +00:00
systrace_args.c Regen. 2017-06-17 00:58:19 +00:00
sysv_ipc.c
sysv_msg.c Remove register keyword from sys/ and ANSIfy prototypes 2017-05-17 00:34:34 +00:00
sysv_sem.c sysvsem: check if semu_list has anything on it before grabbing the lock 2017-10-19 00:31:00 +00:00
sysv_shm.c Audit arguments to System V IPC system calls implementing sempahores, 2017-03-30 22:26:15 +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 Commit the 64-bit inode project. 2017-05-23 09:29:05 +00:00
tty_tty.c
tty_ttydisc.c
tty.c Commit the 64-bit inode project. 2017-05-23 09:29:05 +00:00
uipc_accf.c Listening sockets improvements. 2017-06-08 21:30:34 +00:00
uipc_debug.c ddb show socket debugging 2017-06-15 04:49:12 +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 mbuf(9): unbreak m_fragment() 2017-10-16 21:46:11 +00:00
uipc_mbufhash.c
uipc_mqueue.c Correct sysent flags for dynamically loaded syscalls. 2017-07-14 09:34:44 +00:00
uipc_sem.c Audit arguments to POSIX message queues, semaphores, and shared memory. 2017-03-31 13:43:00 +00:00
uipc_shm.c Use vm_page_active() rather than directly accessing the page's queue 2017-10-02 07:30:21 +00:00
uipc_sockbuf.c Third take on the r319685 and r320480. Actually allow for call soisconnected() 2017-08-24 20:49:19 +00:00
uipc_socket.c Fix locking in soisconnected(). 2017-09-14 18:05:54 +00:00
uipc_syscalls.c Listening sockets improvements. 2017-06-08 21:30:34 +00:00
uipc_usrreq.c Hide struct socket and struct unpcb from the userland. 2017-10-02 23:29:56 +00:00
vfs_acl.c Add system-call argument auditing for ACL-related system calls. 2017-03-30 22:00:58 +00:00
vfs_aio.c Fix aio_suspend in 32-bit emulation 2017-10-26 19:45:15 +00:00
vfs_bio.c Continuing efforts to provide hardening of FFS, this change adds a 2017-09-22 12:45:15 +00:00
vfs_cache.c namecache: factor out ~MAKEENTRY lookups from the common path 2017-10-06 23:05:55 +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 Only handle _PC_MAX_CANON, _PC_MAX_INPUT, and _PC_VDISABLE for TTY devices. 2017-09-21 23:05:32 +00:00
vfs_export.c vfs_export_lookup: Fix r324054 2017-10-06 09:02:36 +00:00
vfs_extattr.c
vfs_hash.c
vfs_init.c Renumber license clauses in sys/kern to avoid skipping #3 2016-09-15 13:16:20 +00:00
vfs_lookup.c When a Linux program tries to access a /path the kernel tries 2017-10-15 18:53:21 +00:00
vfs_mount.c remove process and jail directory machinations from dounmount 2017-10-13 09:42:05 +00:00
vfs_mountroot.c Make root_mount_rel(9) ignore NULL arguments, like it used to before r313351. 2017-09-05 14:32:56 +00:00
vfs_subr.c Avoid the nbp lookup in the final loop iteration in flushbuflist(). 2017-10-20 14:56:13 +00:00
vfs_syscalls.c Remove the support for mknod(S_IFMT), which created dummy vnodes with 2017-10-22 08:11:45 +00:00
vfs_vnops.c Use whole mnt_stat.f_fsid bits for st_dev. 2017-05-27 17:00:30 +00:00
vnode_if.src For UNIX sockets make vnode point not to the socket, but to the UNIX PCB, 2017-06-02 17:31:25 +00:00