block: hung task writing to device

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Hi all,

syzkaller seems to be hitting a lockup with the reproducer below:

INFO: task syzkaller490361:8788 blocked for more than 120 seconds.
     Not tainted 4.12.0-next-20170706+ #186
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syzkaller490361 D18312  8788   5843 0x00080004
Call Trace:
__schedule+0x853/0x1fc0
schedule+0x110/0x460
io_schedule+0x1c/0x70
blk_mq_get_tag+0x670/0xeb0
blk_mq_get_driver_tag+0x4ae/0xa00
blk_mq_sched_insert_request+0x69f/0x8d0
blk_mq_make_request+0x737/0x2540
generic_make_request+0x486/0xef0
submit_bio+0xb0/0x550
submit_bio_wait+0x145/0x1f0
blkdev_issue_flush+0x150/0x210
ext4_sync_file+0xe65/0x1330
vfs_fsync_range+0x10a/0x250
ext4_file_write_iter+0x90c/0x1130
do_iter_readv_writev+0x584/0x8e0
do_iter_write+0x15a/0x540
vfs_writev+0x1e8/0x350
do_writev+0x108/0x2d0
SyS_writev+0x27/0x30
do_syscall_64+0x267/0x740
entry_SYSCALL64_slow_path+0x25/0x25
RIP: 0033:0x4425d9
RSP: 002b:00007fff9ff9e6e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004425d9
RDX: 0000000000000001 RSI: 000000002000dfa0 RDI: 0000000000000003
RBP: 00007fff9ff9e70c R08: 00007fff9ff9e70c R09: 00007fff9ff9e70c
R10: 00007fff9ff9e70c R11: 0000000000000246 R12: 000000000007721b
R13: 0000000000000000 R14: 00007fff9ff9e710 R15: 000000000000016d
INFO: task syzkaller490361:8793 blocked for more than 120 seconds.
     Not tainted 4.12.0-next-20170706+ #186
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syzkaller490361 D18312  8793   5845 0x00080004
Call Trace:
__schedule+0x853/0x1fc0
schedule+0x110/0x460
jbd2_log_wait_commit+0x346/0x520
jbd2_complete_transaction+0x162/0x1b0
ext4_sync_file+0x1093/0x1330
vfs_fsync_range+0x10a/0x250
ext4_file_write_iter+0x90c/0x1130
do_iter_readv_writev+0x584/0x8e0
do_iter_write+0x15a/0x540
vfs_writev+0x1e8/0x350
do_writev+0x108/0x2d0
SyS_writev+0x27/0x30
do_syscall_64+0x267/0x740
entry_SYSCALL64_slow_path+0x25/0x25
RIP: 0033:0x4425d9
RSP: 002b:00007fff9ff9e6e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004425d9
RDX: 0000000000000001 RSI: 000000002000dfa0 RDI: 0000000000000003
RBP: 00007fff9ff9e70c R08: 00007fff9ff9e70c R09: 00007fff9ff9e70c
R10: 00007fff9ff9e70c R11: 0000000000000246 R12: 0000000000077226
R13: 0000000000000000 R14: 00007fff9ff9e710 R15: 000000000000017c
INFO: task syzkaller490361:8794 blocked for more than 120 seconds.
     Not tainted 4.12.0-next-20170706+ #186
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syzkaller490361 D19944  8794   5836 0x00080004
Call Trace:
__schedule+0x853/0x1fc0
schedule+0x110/0x460
io_schedule+0x1c/0x70
wbt_wait+0xa37/0x1030
blk_mq_make_request+0x3d8/0x2540
generic_make_request+0x486/0xef0
submit_bio+0xb0/0x550
submit_bio_wait+0x145/0x1f0
blkdev_issue_flush+0x150/0x210
ext4_sync_file+0xe65/0x1330
vfs_fsync_range+0x10a/0x250
ext4_file_write_iter+0x90c/0x1130
do_iter_readv_writev+0x584/0x8e0
do_iter_write+0x15a/0x540
vfs_writev+0x1e8/0x350
do_writev+0x108/0x2d0
SyS_writev+0x27/0x30
do_syscall_64+0x267/0x740
entry_SYSCALL64_slow_path+0x25/0x25
RIP: 0033:0x4425d9
RSP: 002b:00007fff9ff9e6e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004425d9
RDX: 0000000000000001 RSI: 000000002000dfa0 RDI: 0000000000000003
RBP: 00007fff9ff9e70c R08: 00007fff9ff9e70c R09: 00007fff9ff9e70c
R10: 00007fff9ff9e70c R11: 0000000000000246 R12: 0000000000077235
R13: 0000000000000000 R14: 00007fff9ff9e710 R15: 000000000000016e
INFO: task syzkaller490361:8795 blocked for more than 120 seconds.
     Not tainted 4.12.0-next-20170706+ #186
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syzkaller490361 D18312  8795   5844 0x00080004
Call Trace:
__schedule+0x853/0x1fc0
schedule+0x110/0x460
jbd2_log_wait_commit+0x346/0x520
jbd2_complete_transaction+0x162/0x1b0
ext4_sync_file+0x1093/0x1330
vfs_fsync_range+0x10a/0x250
ext4_file_write_iter+0x90c/0x1130
do_iter_readv_writev+0x584/0x8e0
do_iter_write+0x15a/0x540
vfs_writev+0x1e8/0x350
do_writev+0x108/0x2d0
SyS_writev+0x27/0x30
do_syscall_64+0x267/0x740
entry_SYSCALL64_slow_path+0x25/0x25
RIP: 0033:0x4425d9
RSP: 002b:00007fff9ff9e6e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004425d9
RDX: 0000000000000001 RSI: 000000002000dfa0 RDI: 0000000000000003
RBP: 00007fff9ff9e70c R08: 00007fff9ff9e70c R09: 00007fff9ff9e70c
R10: 00007fff9ff9e70c R11: 0000000000000246 R12: 0000000000077235
R13: 0000000000000000 R14: 00007fff9ff9e710 R15: 0000000000000164
INFO: task syzkaller490361:8797 blocked for more than 120 seconds.
     Not tainted 4.12.0-next-20170706+ #186
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syzkaller490361 D20216  8797   5842 0x00080004
Call Trace:
__schedule+0x853/0x1fc0
schedule+0x110/0x460
io_schedule+0x1c/0x70
wbt_wait+0xa37/0x1030
blk_mq_make_request+0x3d8/0x2540
generic_make_request+0x486/0xef0
submit_bio+0xb0/0x550
ext4_io_submit+0x189/0x220
ext4_writepages+0x1aee/0x3c10
do_writepages+0xff/0x170
__filemap_fdatawrite_range+0x35d/0x490
filemap_write_and_wait_range+0xcd/0x180
generic_file_direct_write+0x2ee/0x3d0
__generic_file_write_iter+0x224/0x600
ext4_file_write_iter+0x861/0x1130
do_iter_readv_writev+0x584/0x8e0
do_iter_write+0x15a/0x540
vfs_writev+0x1e8/0x350
do_writev+0x108/0x2d0
SyS_writev+0x27/0x30
do_syscall_64+0x267/0x740
entry_SYSCALL64_slow_path+0x25/0x25
RIP: 0033:0x4425d9
RSP: 002b:00007fff9ff9e6e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004425d9
RDX: 0000000000000001 RSI: 000000002000dfa0 RDI: 0000000000000003
RBP: 00007fff9ff9e70c R08: 00007fff9ff9e70c R09: 00007fff9ff9e70c
R10: 00007fff9ff9e70c R11: 0000000000000246 R12: 0000000000077230
R13: 0000000000000000 R14: 00007fff9ff9e710 R15: 0000000000000176
INFO: task syzkaller490361:8798 blocked for more than 120 seconds.
     Not tainted 4.12.0-next-20170706+ #186
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syzkaller490361 D20216  8798   5838 0x00080004
Call Trace:
__schedule+0x853/0x1fc0
schedule+0x110/0x460
io_schedule+0x1c/0x70
wbt_wait+0xa37/0x1030
blk_mq_make_request+0x3d8/0x2540
generic_make_request+0x486/0xef0
submit_bio+0xb0/0x550
ext4_io_submit+0x189/0x220
ext4_writepages+0x1aee/0x3c10
do_writepages+0xff/0x170
__filemap_fdatawrite_range+0x35d/0x490
filemap_write_and_wait_range+0xcd/0x180
generic_file_direct_write+0x2ee/0x3d0
__generic_file_write_iter+0x224/0x600
ext4_file_write_iter+0x861/0x1130
do_iter_readv_writev+0x584/0x8e0
do_iter_write+0x15a/0x540
vfs_writev+0x1e8/0x350
do_writev+0x108/0x2d0
SyS_writev+0x27/0x30
do_syscall_64+0x267/0x740
entry_SYSCALL64_slow_path+0x25/0x25
RIP: 0033:0x4425d9
RSP: 002b:00007fff9ff9e6e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004425d9
RDX: 0000000000000001 RSI: 000000002000dfa0 RDI: 0000000000000003
RBP: 00007fff9ff9e70c R08: 00007fff9ff9e70c R09: 00007fff9ff9e70c
R10: 00007fff9ff9e70c R11: 0000000000000246 R12: 000000000007723c
R13: 0000000000000000 R14: 00007fff9ff9e710 R15: 000000000000016a
INFO: task syzkaller490361:8799 blocked for more than 120 seconds.
     Not tainted 4.12.0-next-20170706+ #186
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syzkaller490361 D20552  8799   5837 0x00080004
Call Trace:
__schedule+0x853/0x1fc0
schedule+0x110/0x460
io_schedule+0x1c/0x70
wbt_wait+0xa37/0x1030
blk_mq_make_request+0x3d8/0x2540
generic_make_request+0x486/0xef0
submit_bio+0xb0/0x550
ext4_io_submit+0x189/0x220
ext4_writepages+0x1aee/0x3c10

C reproducer:
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <stdint.h>
#include <string.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <setjmp.h>
#include <signal.h>
#include <string.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <errno.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/prctl.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <dirent.h>
#include <sys/mount.h>
#include <stdarg.h>
#include <stdio.h>

const int kFailStatus = 67;
const int kRetryStatus = 69;

__attribute__((noreturn)) static void doexit(int status)
{
	volatile unsigned i;
	syscall(__NR_exit_group, status);
	for (i = 0;; i++) {
	}
}

__attribute__((noreturn)) static void fail(const char* msg, ...)
{
	int e = errno;
	fflush(stdout);
	va_list args;
	va_start(args, msg);
	vfprintf(stderr, msg, args);
	va_end(args);
	fprintf(stderr, " (errno %d)\n", e);
	doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

__attribute__((noreturn)) static void exitf(const char* msg, ...)
{
	int e = errno;
	fflush(stdout);
	va_list args;
	va_start(args, msg);
	vfprintf(stderr, msg, args);
	va_end(args);
	fprintf(stderr, " (errno %d)\n", e);
	doexit(kRetryStatus);
}

static int flag_debug;

static void debug(const char* msg, ...)
{
	if (!flag_debug)
		return;
	va_list args;
	va_start(args, msg);
	vfprintf(stdout, msg, args);
	va_end(args);
	fflush(stdout);
}

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* uctx)
{
	uintptr_t addr = (uintptr_t)info->si_addr;
	const uintptr_t prog_start = 1 << 20;
	const uintptr_t prog_end = 100 << 20;
	if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) && (addr < prog_start || addr > prog_end)) {
		debug("SIGSEGV on %p, skipping\n", addr);
		_longjmp(segv_env, 1);
	}
	debug("SIGSEGV on %p, exiting\n", addr);
	doexit(sig);
	for (;;) {
	}
}

static void install_segv_handler()
{
	struct sigaction sa;

	memset(&sa, 0, sizeof(sa));
	sa.sa_handler = SIG_IGN;
	syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
	syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);

	memset(&sa, 0, sizeof(sa));
	sa.sa_sigaction = segv_handler;
	sa.sa_flags = SA_NODEFER | SA_SIGINFO;
	sigaction(SIGSEGV, &sa, NULL);
	sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...) { __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); if (_setjmp(segv_env) == 0) { __VA_ARGS__; } __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); }

static void use_temporary_dir()
{
	char tmpdir_template[] = "./syzkaller.XXXXXX";
	char* tmpdir = mkdtemp(tmpdir_template);
	if (!tmpdir)
		fail("failed to mkdtemp");
	if (chmod(tmpdir, 0777))
		fail("failed to chmod");
	if (chdir(tmpdir))
		fail("failed to chdir");
}

static void remove_dir(const char* dir)
{
	DIR* dp;
	struct dirent* ep;
	int iter = 0;
retry:
	dp = opendir(dir);
	if (dp == NULL) {
		if (errno == EMFILE) {
			exitf("opendir(%s) failed due to NOFILE, exiting");
		}
		exitf("opendir(%s) failed", dir);
	}
	while ((ep = readdir(dp))) {
		if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
			continue;
		char filename[FILENAME_MAX];
		snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
		struct stat st;
		if (lstat(filename, &st))
			exitf("lstat(%s) failed", filename);
		if (S_ISDIR(st.st_mode)) {
			remove_dir(filename);
			continue;
		}
		int i;
		for (i = 0;; i++) {
			debug("unlink(%s)\n", filename);
			if (unlink(filename) == 0)
				break;
			if (errno == EROFS) {
				debug("ignoring EROFS\n");
				break;
			}
			if (errno != EBUSY || i > 100)
				exitf("unlink(%s) failed", filename);
			debug("umount(%s)\n", filename);
			if (umount2(filename, MNT_DETACH))
				exitf("umount(%s) failed", filename);
		}
	}
	closedir(dp);
	int i;
	for (i = 0;; i++) {
		debug("rmdir(%s)\n", dir);
		if (rmdir(dir) == 0)
			break;
		if (i < 100) {
			if (errno == EROFS) {
				debug("ignoring EROFS\n");
				break;
			}
			if (errno == EBUSY) {
				debug("umount(%s)\n", dir);
				if (umount2(dir, MNT_DETACH))
					exitf("umount(%s) failed", dir);
				continue;
			}
			if (errno == ENOTEMPTY) {
				if (iter < 100) {
					iter++;
					goto retry;
				}
			}
		}
		exitf("rmdir(%s) failed", dir);
	}
}

static uint64_t current_time_ms()
{
	struct timespec ts;

	if (clock_gettime(CLOCK_MONOTONIC, &ts))
		fail("clock_gettime failed");
	return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void test();

void loop()
{
	int iter;
	for (iter = 0;; iter++) {
		char cwdbuf[256];
		sprintf(cwdbuf, "./%d", iter);
		if (mkdir(cwdbuf, 0777))
			fail("failed to mkdir");
		int pid = fork();
		if (pid < 0)
			fail("clone failed");
		if (pid == 0) {
			prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
			setpgrp();
			if (chdir(cwdbuf))
				fail("failed to chdir");
			test();
			doexit(0);
		}
		int status = 0;
		uint64_t start = current_time_ms();
		for (;;) {
			int res = waitpid(-1, &status, __WALL | WNOHANG);
			if (res == pid)
				break;
			usleep(1000);
			if (current_time_ms() - start > 5 * 1000) {
				kill(-pid, SIGKILL);
				kill(pid, SIGKILL);
				while (waitpid(-1, &status, __WALL) != pid) {
				}
				break;
			}
		}
		remove_dir(cwdbuf);
	}
}

long r[13];
void test()
{
	debug("test\n");
	syscall(SYS_write, 1, "executing program\n", strlen("executing program\n"));
	memset(r, -1, sizeof(r));
	r[0] = syscall(__NR_mmap, 0x20000000ul, 0xd000ul, 0x3ul, 0x32ul, 0xfffffffffffffffful, 0x0ul);
	NONFAILING(memcpy((void*)0x20000ff8, "\x2e\x2f\x66\x69\x6c\x65\x30\x00", 8));
	r[2] = syscall(__NR_open, 0x20000ff8ul, 0xfbfeul, 0x0ul);
	r[3] = syscall(__NR_ftruncate, r[2], 0x80100ul);
	r[4] = syscall(__NR_mmap, 0x2000a000ul, 0x4000ul, 0x3ul, 0x2011ul, r[2], 0x0ul);
	NONFAILING(*(uint64_t*)0x2000ffa0 = (uint64_t)0x2000afa7);
	NONFAILING(*(uint64_t*)0x2000ffa8 = (uint64_t)0x1);
	NONFAILING(memcpy((void*)0x2000afa7, "\xe1", 1));
	r[8] = syscall(__NR_vmsplice, 0xfffffffffffffffful, 0x2000ffa0ul, 0x1ul, 0x0ul);
	NONFAILING(*(uint64_t*)0x2000dfa0 = (uint64_t)0x20003000);
	NONFAILING(*(uint64_t*)0x2000dfa8 = (uint64_t)0xe00);
	NONFAILING(memcpy((void*)0x20003000, 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3584));
	r[12] = syscall(__NR_writev, r[2], 0x2000dfa0ul, 0x1ul);
}

int main()
{
	int i;	for (i = 0; i < 8; i++) {
		if (fork() == 0) {
			install_segv_handler();
			use_temporary_dir();
			loop();
			return 0;
		}
	}
	sleep(1000000);
	return 0;
}

-- 

Thanks,
Sasha



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